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Tsirkin" X-Patchwork-Id: 11593319 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 10B3E90 for ; Mon, 8 Jun 2020 12:55:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DCACA2078D for ; Mon, 8 Jun 2020 12:55:14 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="ZvBEBVz2" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729831AbgFHMyd (ORCPT ); Mon, 8 Jun 2020 08:54:33 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:24955 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729562AbgFHMxO (ORCPT ); Mon, 8 Jun 2020 08:53:14 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591620791; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=pyZgoc1IoaMWB9Jefr7e/GoAFJJxo7imj3dgpBB/etA=; b=ZvBEBVz2xIoW3KgMCmE7cwtAtKilrGaCLLOPI34JEdebZpArFaYtHTddj+SF6m3RyHvMGh 5YsLrY7nNd5TSa/UeCLJZOpmXbVNQG1XYDUjuyeGsWQjs2PX/ymMsKvz6ckkdxHzn8tQUj LV0zruHvqbKgAgZG4e3t90t42uEvYWs= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-344-E4aHXkM3OeOUUYv2wu6yGg-1; Mon, 08 Jun 2020 08:52:58 -0400 X-MC-Unique: E4aHXkM3OeOUUYv2wu6yGg-1 Received: by mail-wm1-f70.google.com with SMTP id p24so1497796wma.4 for ; Mon, 08 Jun 2020 05:52:57 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=pyZgoc1IoaMWB9Jefr7e/GoAFJJxo7imj3dgpBB/etA=; b=j/1k4me6ZoYYF4TkyBlveXbFDuvB2x2qZaBAk3vDF1dvsb5nD0H6wfSoY+7QVcdnv6 weiZqwhY9CfOqk4vkS5PyS+VDBDCHQbqPsNsSrGFQIxLoTfyo89cH79ktdPmajcpjBMR ePKvJ/3NkCLojljaYrU19skTCsbpj8Qu+lkJG2BsPbIZmh/239/dY79qlnBM6sVucN1h Q5X+cBa69guXHZF51gdu9pw9MojvqKixrewr35wnfXfgqRqUAV+bgZLkLb2AoCzCaUZR 4aw5Wz+tbWDQjN4W8PGq79c5jL6ZicOdyjJ3EHXD4vX8vxSJ7cVsXt6hlu2w2TgKRWi3 XuvA== X-Gm-Message-State: AOAM531WCGb9rWIIGJ0Xv7RI3GBgirYHrFGKLDIxgITHuC0yBdY9fFtM lECO9GrQVvF69Z3YgRmbUA6UqkXQwkNtV66/eXJwr6bHuFZDf/sUwurZ0Kb4K26rWdBIueWS2+o 2XvxbPWyQU+zy X-Received: by 2002:a7b:cb93:: with SMTP id m19mr17016542wmi.165.1591620776336; Mon, 08 Jun 2020 05:52:56 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzEdknqoJU3HSkUfhKPXzphp7+7B7/1HQpacB61dXsZyraKBYychpqxInl7px+4iWcK/8HI/Q== X-Received: by 2002:a7b:cb93:: with SMTP id m19mr17016499wmi.165.1591620775843; Mon, 08 Jun 2020 05:52:55 -0700 (PDT) Received: from redhat.com (bzq-109-64-41-91.red.bezeqint.net. [109.64.41.91]) by smtp.gmail.com with ESMTPSA id g187sm22919251wma.17.2020.06.08.05.52.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2020 05:52:55 -0700 (PDT) Date: Mon, 8 Jun 2020 08:52:53 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, Jason Wang , eperezma@redhat.com Subject: [PATCH RFC v6 01/11] vhost: option to fetch descriptors through an independent struct Message-ID: <20200608125238.728563-2-mst@redhat.com> References: <20200608125238.728563-1-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200608125238.728563-1-mst@redhat.com> X-Mailer: git-send-email 2.24.1.751.gd10ce2899c X-Mutt-Fcc: =sent Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org The idea is to support multiple ring formats by converting to a format-independent array of descriptors. This costs extra cycles, but we gain in ability to fetch a batch of descriptors in one go, which is good for code cache locality. When used, this causes a minor performance degradation, it's been kept as simple as possible for ease of review. A follow-up patch gets us back the performance by adding batching. To simplify benchmarking, I kept the old code around so one can switch back and forth between old and new code. This will go away in the final submission. Signed-off-by: Michael S. Tsirkin Signed-off-by: Eugenio Pérez Link: https://lore.kernel.org/r/20200401183118.8334-2-eperezma@redhat.com Signed-off-by: Michael S. Tsirkin --- drivers/vhost/vhost.c | 305 +++++++++++++++++++++++++++++++++++++++++- drivers/vhost/vhost.h | 16 +++ 2 files changed, 320 insertions(+), 1 deletion(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 172da092107e..180b7b58c76b 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -303,6 +303,7 @@ static void vhost_vq_reset(struct vhost_dev *dev, struct vhost_virtqueue *vq) { vq->num = 1; + vq->ndescs = 0; vq->desc = NULL; vq->avail = NULL; vq->used = NULL; @@ -373,6 +374,9 @@ static int vhost_worker(void *data) static void vhost_vq_free_iovecs(struct vhost_virtqueue *vq) { + kfree(vq->descs); + vq->descs = NULL; + vq->max_descs = 0; kfree(vq->indirect); vq->indirect = NULL; kfree(vq->log); @@ -389,6 +393,10 @@ static long vhost_dev_alloc_iovecs(struct vhost_dev *dev) for (i = 0; i < dev->nvqs; ++i) { vq = dev->vqs[i]; + vq->max_descs = dev->iov_limit; + vq->descs = kmalloc_array(vq->max_descs, + sizeof(*vq->descs), + GFP_KERNEL); vq->indirect = kmalloc_array(UIO_MAXIOV, sizeof(*vq->indirect), GFP_KERNEL); @@ -396,7 +404,7 @@ static long vhost_dev_alloc_iovecs(struct vhost_dev *dev) GFP_KERNEL); vq->heads = kmalloc_array(dev->iov_limit, sizeof(*vq->heads), GFP_KERNEL); - if (!vq->indirect || !vq->log || !vq->heads) + if (!vq->indirect || !vq->log || !vq->heads || !vq->descs) goto err_nomem; } return 0; @@ -488,6 +496,8 @@ void vhost_dev_init(struct vhost_dev *dev, for (i = 0; i < dev->nvqs; ++i) { vq = dev->vqs[i]; + vq->descs = NULL; + vq->max_descs = 0; vq->log = NULL; vq->indirect = NULL; vq->heads = NULL; @@ -2315,6 +2325,299 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq, } EXPORT_SYMBOL_GPL(vhost_get_vq_desc); +static struct vhost_desc *peek_split_desc(struct vhost_virtqueue *vq) +{ + BUG_ON(!vq->ndescs); + return &vq->descs[vq->ndescs - 1]; +} + +static void pop_split_desc(struct vhost_virtqueue *vq) +{ + BUG_ON(!vq->ndescs); + --vq->ndescs; +} + +#define VHOST_DESC_FLAGS (VRING_DESC_F_INDIRECT | VRING_DESC_F_WRITE | \ + VRING_DESC_F_NEXT) +static int push_split_desc(struct vhost_virtqueue *vq, struct vring_desc *desc, u16 id) +{ + struct vhost_desc *h; + + if (unlikely(vq->ndescs >= vq->max_descs)) + return -EINVAL; + h = &vq->descs[vq->ndescs++]; + h->addr = vhost64_to_cpu(vq, desc->addr); + h->len = vhost32_to_cpu(vq, desc->len); + h->flags = vhost16_to_cpu(vq, desc->flags) & VHOST_DESC_FLAGS; + h->id = id; + + return 0; +} + +static int fetch_indirect_descs(struct vhost_virtqueue *vq, + struct vhost_desc *indirect, + u16 head) +{ + struct vring_desc desc; + unsigned int i = 0, count, found = 0; + u32 len = indirect->len; + struct iov_iter from; + int ret; + + /* Sanity check */ + if (unlikely(len % sizeof desc)) { + vq_err(vq, "Invalid length in indirect descriptor: " + "len 0x%llx not multiple of 0x%zx\n", + (unsigned long long)len, + sizeof desc); + return -EINVAL; + } + + ret = translate_desc(vq, indirect->addr, len, vq->indirect, + UIO_MAXIOV, VHOST_ACCESS_RO); + if (unlikely(ret < 0)) { + if (ret != -EAGAIN) + vq_err(vq, "Translation failure %d in indirect.\n", ret); + return ret; + } + iov_iter_init(&from, READ, vq->indirect, ret, len); + + /* We will use the result as an address to read from, so most + * architectures only need a compiler barrier here. */ + read_barrier_depends(); + + count = len / sizeof desc; + /* Buffers are chained via a 16 bit next field, so + * we can have at most 2^16 of these. */ + if (unlikely(count > USHRT_MAX + 1)) { + vq_err(vq, "Indirect buffer length too big: %d\n", + indirect->len); + return -E2BIG; + } + if (unlikely(vq->ndescs + count > vq->max_descs)) { + vq_err(vq, "Too many indirect + direct descs: %d + %d\n", + vq->ndescs, indirect->len); + return -E2BIG; + } + + do { + if (unlikely(++found > count)) { + vq_err(vq, "Loop detected: last one at %u " + "indirect size %u\n", + i, count); + return -EINVAL; + } + if (unlikely(!copy_from_iter_full(&desc, sizeof(desc), &from))) { + vq_err(vq, "Failed indirect descriptor: idx %d, %zx\n", + i, (size_t)indirect->addr + i * sizeof desc); + return -EINVAL; + } + if (unlikely(desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_INDIRECT))) { + vq_err(vq, "Nested indirect descriptor: idx %d, %zx\n", + i, (size_t)indirect->addr + i * sizeof desc); + return -EINVAL; + } + + /* Note: push_split_desc can't fail here: + * we never fetch unless there's space. */ + ret = push_split_desc(vq, &desc, head); + WARN_ON(ret); + } while ((i = next_desc(vq, &desc)) != -1); + return 0; +} + +/* This function returns a value > 0 if a descriptor was found, or 0 if none were found. + * A negative code is returned on error. */ +static int fetch_descs(struct vhost_virtqueue *vq) +{ + unsigned int i, head, found = 0; + struct vhost_desc *last; + struct vring_desc desc; + __virtio16 avail_idx; + __virtio16 ring_head; + u16 last_avail_idx; + int ret; + + /* Check it isn't doing very strange things with descriptor numbers. */ + last_avail_idx = vq->last_avail_idx; + + if (vq->avail_idx == vq->last_avail_idx) { + if (unlikely(vhost_get_avail_idx(vq, &avail_idx))) { + vq_err(vq, "Failed to access avail idx at %p\n", + &vq->avail->idx); + return -EFAULT; + } + vq->avail_idx = vhost16_to_cpu(vq, avail_idx); + + if (unlikely((u16)(vq->avail_idx - last_avail_idx) > vq->num)) { + vq_err(vq, "Guest moved used index from %u to %u", + last_avail_idx, vq->avail_idx); + return -EFAULT; + } + + /* If there's nothing new since last we looked, return + * invalid. + */ + if (vq->avail_idx == last_avail_idx) + return 0; + + /* Only get avail ring entries after they have been + * exposed by guest. + */ + smp_rmb(); + } + + /* Grab the next descriptor number they're advertising */ + if (unlikely(vhost_get_avail_head(vq, &ring_head, last_avail_idx))) { + vq_err(vq, "Failed to read head: idx %d address %p\n", + last_avail_idx, + &vq->avail->ring[last_avail_idx % vq->num]); + return -EFAULT; + } + + head = vhost16_to_cpu(vq, ring_head); + + /* If their number is silly, that's an error. */ + if (unlikely(head >= vq->num)) { + vq_err(vq, "Guest says index %u > %u is available", + head, vq->num); + return -EINVAL; + } + + i = head; + do { + if (unlikely(i >= vq->num)) { + vq_err(vq, "Desc index is %u > %u, head = %u", + i, vq->num, head); + return -EINVAL; + } + if (unlikely(++found > vq->num)) { + vq_err(vq, "Loop detected: last one at %u " + "vq size %u head %u\n", + i, vq->num, head); + return -EINVAL; + } + ret = vhost_get_desc(vq, &desc, i); + if (unlikely(ret)) { + vq_err(vq, "Failed to get descriptor: idx %d addr %p\n", + i, vq->desc + i); + return -EFAULT; + } + ret = push_split_desc(vq, &desc, head); + if (unlikely(ret)) { + vq_err(vq, "Failed to save descriptor: idx %d\n", i); + return -EINVAL; + } + } while ((i = next_desc(vq, &desc)) != -1); + + last = peek_split_desc(vq); + if (unlikely(last->flags & VRING_DESC_F_INDIRECT)) { + pop_split_desc(vq); + ret = fetch_indirect_descs(vq, last, head); + if (unlikely(ret < 0)) { + if (ret != -EAGAIN) + vq_err(vq, "Failure detected " + "in indirect descriptor at idx %d\n", head); + return ret; + } + } + + /* Assume notifications from guest are disabled at this point, + * if they aren't we would need to update avail_event index. */ + BUG_ON(!(vq->used_flags & VRING_USED_F_NO_NOTIFY)); + + /* On success, increment avail index. */ + vq->last_avail_idx++; + + return 1; +} + +/* This looks in the virtqueue and for the first available buffer, and converts + * it to an iovec for convenient access. Since descriptors consist of some + * number of output then some number of input descriptors, it's actually two + * iovecs, but we pack them into one and note how many of each there were. + * + * This function returns the descriptor number found, or vq->num (which is + * never a valid descriptor number) if none was found. A negative code is + * returned on error. */ +int vhost_get_vq_desc_batch(struct vhost_virtqueue *vq, + struct iovec iov[], unsigned int iov_size, + unsigned int *out_num, unsigned int *in_num, + struct vhost_log *log, unsigned int *log_num) +{ + int ret = fetch_descs(vq); + int i; + + if (ret <= 0) + goto err_fetch; + + /* Now convert to IOV */ + /* When we start there are none of either input nor output. */ + *out_num = *in_num = 0; + if (unlikely(log)) + *log_num = 0; + + for (i = 0; i < vq->ndescs; ++i) { + unsigned iov_count = *in_num + *out_num; + struct vhost_desc *desc = &vq->descs[i]; + int access; + + if (desc->flags & ~VHOST_DESC_FLAGS) { + vq_err(vq, "Unexpected flags: 0x%x at descriptor id 0x%x\n", + desc->flags, desc->id); + ret = -EINVAL; + goto err; + } + if (desc->flags & VRING_DESC_F_WRITE) + access = VHOST_ACCESS_WO; + else + access = VHOST_ACCESS_RO; + ret = translate_desc(vq, desc->addr, + desc->len, iov + iov_count, + iov_size - iov_count, access); + if (unlikely(ret < 0)) { + if (ret != -EAGAIN) + vq_err(vq, "Translation failure %d descriptor idx %d\n", + ret, i); + goto err; + } + if (access == VHOST_ACCESS_WO) { + /* If this is an input descriptor, + * increment that count. */ + *in_num += ret; + if (unlikely(log && ret)) { + log[*log_num].addr = desc->addr; + log[*log_num].len = desc->len; + ++*log_num; + } + } else { + /* If it's an output descriptor, they're all supposed + * to come before any input descriptors. */ + if (unlikely(*in_num)) { + vq_err(vq, "Descriptor has out after in: " + "idx %d\n", i); + ret = -EINVAL; + goto err; + } + *out_num += ret; + } + + ret = desc->id; + } + + vq->ndescs = 0; + + return ret; + +err: + vhost_discard_vq_desc(vq, 1); +err_fetch: + vq->ndescs = 0; + + return ret; +} +EXPORT_SYMBOL_GPL(vhost_get_vq_desc_batch); + /* Reverse the effect of vhost_get_vq_desc. Useful for error handling. */ void vhost_discard_vq_desc(struct vhost_virtqueue *vq, int n) { diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index c8e96a095d3b..87089d51490d 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -60,6 +60,13 @@ enum vhost_uaddr_type { VHOST_NUM_ADDRS = 3, }; +struct vhost_desc { + u64 addr; + u32 len; + u16 flags; /* VRING_DESC_F_WRITE, VRING_DESC_F_NEXT */ + u16 id; +}; + /* The virtqueue structure describes a queue attached to a device. */ struct vhost_virtqueue { struct vhost_dev *dev; @@ -71,6 +78,11 @@ struct vhost_virtqueue { vring_avail_t __user *avail; vring_used_t __user *used; const struct vhost_iotlb_map *meta_iotlb[VHOST_NUM_ADDRS]; + + struct vhost_desc *descs; + int ndescs; + int max_descs; + struct file *kick; struct eventfd_ctx *call_ctx; struct eventfd_ctx *error_ctx; @@ -177,6 +189,10 @@ long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *arg bool vhost_vq_access_ok(struct vhost_virtqueue *vq); bool vhost_log_access_ok(struct vhost_dev *); +int vhost_get_vq_desc_batch(struct vhost_virtqueue *, + struct iovec iov[], unsigned int iov_count, + unsigned int *out_num, unsigned int *in_num, + struct vhost_log *log, unsigned int *log_num); int vhost_get_vq_desc(struct vhost_virtqueue *, struct iovec iov[], unsigned int iov_count, unsigned int *out_num, unsigned int *in_num, From patchwork Mon Jun 8 12:52:56 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 11593295 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 40F7B90 for ; Mon, 8 Jun 2020 12:53:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1C8ED2076C for ; Mon, 8 Jun 2020 12:53:28 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="AhMPIDjr" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729650AbgFHMxR (ORCPT ); Mon, 8 Jun 2020 08:53:17 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:55455 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729451AbgFHMxL (ORCPT ); Mon, 8 Jun 2020 08:53:11 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591620787; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=1DnrUxs6WiaZdAUTZ1DCu3SMBfamowHkG+YOVbhUgOU=; b=AhMPIDjr3BCcrrprBrVAhMVE7djsS6jcGHGlNlGf4TNXghM36xrfKyRZ9ZK0St2bvknIM9 lsONGvjjRF4F5A1movThdwrwdlKe/T+v+ZdvUZSO3M9gdovAxVGX3rHj8d0DyLjQ8g65QB IWA5wB9mOfeshWUYqOCvt9ViO5exq0s= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-317-x59zYt_vPrmBXqpJ871H9g-1; Mon, 08 Jun 2020 08:53:00 -0400 X-MC-Unique: x59zYt_vPrmBXqpJ871H9g-1 Received: by mail-wr1-f69.google.com with SMTP id f4so7120744wrp.21 for ; Mon, 08 Jun 2020 05:53:00 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:content-transfer-encoding :in-reply-to; bh=1DnrUxs6WiaZdAUTZ1DCu3SMBfamowHkG+YOVbhUgOU=; b=q2/fVbVsgOfEiyiO7RRbpJm+jFzWJSr0ByNFMvCpM/ooLUF5hXKl4C2+iFtt3Mflqt gBrsL+Bt0lC7ybJ+YnbUlXQ+97h///62/TO0VMzi7I9Y/1Q3byvBcQsPwlWu2C/Ku275 tEDYDpPhV94oM139KHblPzKGFqMTG8hkmO42ubXLus//q60YgajgUp9SzL4NCithZ25L pClnTRmY1yjUc3f6ylsWDRrkzar38CZubUXTuo/ZKwsXyEuDWMXjq0P0CaYh08q3n4ue MPGAlW7NAqKX3fhiFg65Zoq1dICzcKbdIKeTfz1T0ObnfRMeV4VT7AY2/K+oZ995nfvO lFVw== X-Gm-Message-State: AOAM532CxvPM/7yK4Gx/Oupp/GCMGHIz7Dr2mP9UvfexmhlzjkilMnvU ZQBmYy2NiL4pgiooprdrX3fpOXbfvYrop7wtxwiFgNUAHN1y5KojFZNOpom1aJ2e46dR6ehEd54 xv3oImmVNg2iV X-Received: by 2002:adf:fb92:: with SMTP id a18mr23863447wrr.263.1591620778392; Mon, 08 Jun 2020 05:52:58 -0700 (PDT) X-Google-Smtp-Source: ABdhPJy7zln2kdb1pxmg3n/kEmFfClQ7VDjVlR/0I8gaqlDMVkpw4lmd34/LQrhQscpfdGSeiviTPw== X-Received: by 2002:adf:fb92:: with SMTP id a18mr23863408wrr.263.1591620777892; Mon, 08 Jun 2020 05:52:57 -0700 (PDT) Received: from redhat.com (bzq-109-64-41-91.red.bezeqint.net. [109.64.41.91]) by smtp.gmail.com with ESMTPSA id t8sm22817233wro.56.2020.06.08.05.52.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2020 05:52:57 -0700 (PDT) Date: Mon, 8 Jun 2020 08:52:56 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, Jason Wang , eperezma@redhat.com Subject: [PATCH RFC v6 02/11] vhost: use batched get_vq_desc version Message-ID: <20200608125238.728563-3-mst@redhat.com> References: <20200608125238.728563-1-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200608125238.728563-1-mst@redhat.com> X-Mailer: git-send-email 2.24.1.751.gd10ce2899c X-Mutt-Fcc: =sent Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org As testing shows no performance change, switch to that now. Signed-off-by: Michael S. Tsirkin Signed-off-by: Eugenio Pérez Link: https://lore.kernel.org/r/20200401183118.8334-3-eperezma@redhat.com Signed-off-by: Michael S. Tsirkin --- drivers/vhost/test.c | 2 +- drivers/vhost/vhost.c | 318 ++++++++---------------------------------- drivers/vhost/vhost.h | 7 +- 3 files changed, 65 insertions(+), 262 deletions(-) diff --git a/drivers/vhost/test.c b/drivers/vhost/test.c index 0466921f4772..7d69778aaa26 100644 --- a/drivers/vhost/test.c +++ b/drivers/vhost/test.c @@ -119,7 +119,7 @@ static int vhost_test_open(struct inode *inode, struct file *f) dev = &n->dev; vqs[VHOST_TEST_VQ] = &n->vqs[VHOST_TEST_VQ]; n->vqs[VHOST_TEST_VQ].handle_kick = handle_vq_kick; - vhost_dev_init(dev, vqs, VHOST_TEST_VQ_MAX, UIO_MAXIOV, + vhost_dev_init(dev, vqs, VHOST_TEST_VQ_MAX, UIO_MAXIOV + 64, VHOST_TEST_PKT_WEIGHT, VHOST_TEST_WEIGHT, true, NULL); f->private_data = n; diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 180b7b58c76b..41d6b132c234 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -304,6 +304,7 @@ static void vhost_vq_reset(struct vhost_dev *dev, { vq->num = 1; vq->ndescs = 0; + vq->first_desc = 0; vq->desc = NULL; vq->avail = NULL; vq->used = NULL; @@ -372,6 +373,11 @@ static int vhost_worker(void *data) return 0; } +static int vhost_vq_num_batch_descs(struct vhost_virtqueue *vq) +{ + return vq->max_descs - UIO_MAXIOV; +} + static void vhost_vq_free_iovecs(struct vhost_virtqueue *vq) { kfree(vq->descs); @@ -394,6 +400,9 @@ static long vhost_dev_alloc_iovecs(struct vhost_dev *dev) for (i = 0; i < dev->nvqs; ++i) { vq = dev->vqs[i]; vq->max_descs = dev->iov_limit; + if (vhost_vq_num_batch_descs(vq) < 0) { + return -EINVAL; + } vq->descs = kmalloc_array(vq->max_descs, sizeof(*vq->descs), GFP_KERNEL); @@ -1610,6 +1619,7 @@ long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *arg vq->last_avail_idx = s.num; /* Forget the cached index value. */ vq->avail_idx = vq->last_avail_idx; + vq->ndescs = vq->first_desc = 0; break; case VHOST_GET_VRING_BASE: s.index = idx; @@ -2078,253 +2088,6 @@ static unsigned next_desc(struct vhost_virtqueue *vq, struct vring_desc *desc) return next; } -static int get_indirect(struct vhost_virtqueue *vq, - struct iovec iov[], unsigned int iov_size, - unsigned int *out_num, unsigned int *in_num, - struct vhost_log *log, unsigned int *log_num, - struct vring_desc *indirect) -{ - struct vring_desc desc; - unsigned int i = 0, count, found = 0; - u32 len = vhost32_to_cpu(vq, indirect->len); - struct iov_iter from; - int ret, access; - - /* Sanity check */ - if (unlikely(len % sizeof desc)) { - vq_err(vq, "Invalid length in indirect descriptor: " - "len 0x%llx not multiple of 0x%zx\n", - (unsigned long long)len, - sizeof desc); - return -EINVAL; - } - - ret = translate_desc(vq, vhost64_to_cpu(vq, indirect->addr), len, vq->indirect, - UIO_MAXIOV, VHOST_ACCESS_RO); - if (unlikely(ret < 0)) { - if (ret != -EAGAIN) - vq_err(vq, "Translation failure %d in indirect.\n", ret); - return ret; - } - iov_iter_init(&from, READ, vq->indirect, ret, len); - - /* We will use the result as an address to read from, so most - * architectures only need a compiler barrier here. */ - read_barrier_depends(); - - count = len / sizeof desc; - /* Buffers are chained via a 16 bit next field, so - * we can have at most 2^16 of these. */ - if (unlikely(count > USHRT_MAX + 1)) { - vq_err(vq, "Indirect buffer length too big: %d\n", - indirect->len); - return -E2BIG; - } - - do { - unsigned iov_count = *in_num + *out_num; - if (unlikely(++found > count)) { - vq_err(vq, "Loop detected: last one at %u " - "indirect size %u\n", - i, count); - return -EINVAL; - } - if (unlikely(!copy_from_iter_full(&desc, sizeof(desc), &from))) { - vq_err(vq, "Failed indirect descriptor: idx %d, %zx\n", - i, (size_t)vhost64_to_cpu(vq, indirect->addr) + i * sizeof desc); - return -EINVAL; - } - if (unlikely(desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_INDIRECT))) { - vq_err(vq, "Nested indirect descriptor: idx %d, %zx\n", - i, (size_t)vhost64_to_cpu(vq, indirect->addr) + i * sizeof desc); - return -EINVAL; - } - - if (desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_WRITE)) - access = VHOST_ACCESS_WO; - else - access = VHOST_ACCESS_RO; - - ret = translate_desc(vq, vhost64_to_cpu(vq, desc.addr), - vhost32_to_cpu(vq, desc.len), iov + iov_count, - iov_size - iov_count, access); - if (unlikely(ret < 0)) { - if (ret != -EAGAIN) - vq_err(vq, "Translation failure %d indirect idx %d\n", - ret, i); - return ret; - } - /* If this is an input descriptor, increment that count. */ - if (access == VHOST_ACCESS_WO) { - *in_num += ret; - if (unlikely(log && ret)) { - log[*log_num].addr = vhost64_to_cpu(vq, desc.addr); - log[*log_num].len = vhost32_to_cpu(vq, desc.len); - ++*log_num; - } - } else { - /* If it's an output descriptor, they're all supposed - * to come before any input descriptors. */ - if (unlikely(*in_num)) { - vq_err(vq, "Indirect descriptor " - "has out after in: idx %d\n", i); - return -EINVAL; - } - *out_num += ret; - } - } while ((i = next_desc(vq, &desc)) != -1); - return 0; -} - -/* This looks in the virtqueue and for the first available buffer, and converts - * it to an iovec for convenient access. Since descriptors consist of some - * number of output then some number of input descriptors, it's actually two - * iovecs, but we pack them into one and note how many of each there were. - * - * This function returns the descriptor number found, or vq->num (which is - * never a valid descriptor number) if none was found. A negative code is - * returned on error. */ -int vhost_get_vq_desc(struct vhost_virtqueue *vq, - struct iovec iov[], unsigned int iov_size, - unsigned int *out_num, unsigned int *in_num, - struct vhost_log *log, unsigned int *log_num) -{ - struct vring_desc desc; - unsigned int i, head, found = 0; - u16 last_avail_idx; - __virtio16 avail_idx; - __virtio16 ring_head; - int ret, access; - - /* Check it isn't doing very strange things with descriptor numbers. */ - last_avail_idx = vq->last_avail_idx; - - if (vq->avail_idx == vq->last_avail_idx) { - if (unlikely(vhost_get_avail_idx(vq, &avail_idx))) { - vq_err(vq, "Failed to access avail idx at %p\n", - &vq->avail->idx); - return -EFAULT; - } - vq->avail_idx = vhost16_to_cpu(vq, avail_idx); - - if (unlikely((u16)(vq->avail_idx - last_avail_idx) > vq->num)) { - vq_err(vq, "Guest moved used index from %u to %u", - last_avail_idx, vq->avail_idx); - return -EFAULT; - } - - /* If there's nothing new since last we looked, return - * invalid. - */ - if (vq->avail_idx == last_avail_idx) - return vq->num; - - /* Only get avail ring entries after they have been - * exposed by guest. - */ - smp_rmb(); - } - - /* Grab the next descriptor number they're advertising, and increment - * the index we've seen. */ - if (unlikely(vhost_get_avail_head(vq, &ring_head, last_avail_idx))) { - vq_err(vq, "Failed to read head: idx %d address %p\n", - last_avail_idx, - &vq->avail->ring[last_avail_idx % vq->num]); - return -EFAULT; - } - - head = vhost16_to_cpu(vq, ring_head); - - /* If their number is silly, that's an error. */ - if (unlikely(head >= vq->num)) { - vq_err(vq, "Guest says index %u > %u is available", - head, vq->num); - return -EINVAL; - } - - /* When we start there are none of either input nor output. */ - *out_num = *in_num = 0; - if (unlikely(log)) - *log_num = 0; - - i = head; - do { - unsigned iov_count = *in_num + *out_num; - if (unlikely(i >= vq->num)) { - vq_err(vq, "Desc index is %u > %u, head = %u", - i, vq->num, head); - return -EINVAL; - } - if (unlikely(++found > vq->num)) { - vq_err(vq, "Loop detected: last one at %u " - "vq size %u head %u\n", - i, vq->num, head); - return -EINVAL; - } - ret = vhost_get_desc(vq, &desc, i); - if (unlikely(ret)) { - vq_err(vq, "Failed to get descriptor: idx %d addr %p\n", - i, vq->desc + i); - return -EFAULT; - } - if (desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_INDIRECT)) { - ret = get_indirect(vq, iov, iov_size, - out_num, in_num, - log, log_num, &desc); - if (unlikely(ret < 0)) { - if (ret != -EAGAIN) - vq_err(vq, "Failure detected " - "in indirect descriptor at idx %d\n", i); - return ret; - } - continue; - } - - if (desc.flags & cpu_to_vhost16(vq, VRING_DESC_F_WRITE)) - access = VHOST_ACCESS_WO; - else - access = VHOST_ACCESS_RO; - ret = translate_desc(vq, vhost64_to_cpu(vq, desc.addr), - vhost32_to_cpu(vq, desc.len), iov + iov_count, - iov_size - iov_count, access); - if (unlikely(ret < 0)) { - if (ret != -EAGAIN) - vq_err(vq, "Translation failure %d descriptor idx %d\n", - ret, i); - return ret; - } - if (access == VHOST_ACCESS_WO) { - /* If this is an input descriptor, - * increment that count. */ - *in_num += ret; - if (unlikely(log && ret)) { - log[*log_num].addr = vhost64_to_cpu(vq, desc.addr); - log[*log_num].len = vhost32_to_cpu(vq, desc.len); - ++*log_num; - } - } else { - /* If it's an output descriptor, they're all supposed - * to come before any input descriptors. */ - if (unlikely(*in_num)) { - vq_err(vq, "Descriptor has out after in: " - "idx %d\n", i); - return -EINVAL; - } - *out_num += ret; - } - } while ((i = next_desc(vq, &desc)) != -1); - - /* On success, increment avail index. */ - vq->last_avail_idx++; - - /* Assume notifications from guest are disabled at this point, - * if they aren't we would need to update avail_event index. */ - BUG_ON(!(vq->used_flags & VRING_USED_F_NO_NOTIFY)); - return head; -} -EXPORT_SYMBOL_GPL(vhost_get_vq_desc); - static struct vhost_desc *peek_split_desc(struct vhost_virtqueue *vq) { BUG_ON(!vq->ndescs); @@ -2428,7 +2191,7 @@ static int fetch_indirect_descs(struct vhost_virtqueue *vq, /* This function returns a value > 0 if a descriptor was found, or 0 if none were found. * A negative code is returned on error. */ -static int fetch_descs(struct vhost_virtqueue *vq) +static int fetch_buf(struct vhost_virtqueue *vq) { unsigned int i, head, found = 0; struct vhost_desc *last; @@ -2441,7 +2204,11 @@ static int fetch_descs(struct vhost_virtqueue *vq) /* Check it isn't doing very strange things with descriptor numbers. */ last_avail_idx = vq->last_avail_idx; - if (vq->avail_idx == vq->last_avail_idx) { + if (unlikely(vq->avail_idx == vq->last_avail_idx)) { + /* If we already have work to do, don't bother re-checking. */ + if (likely(vq->ndescs)) + return 1; + if (unlikely(vhost_get_avail_idx(vq, &avail_idx))) { vq_err(vq, "Failed to access avail idx at %p\n", &vq->avail->idx); @@ -2532,6 +2299,41 @@ static int fetch_descs(struct vhost_virtqueue *vq) return 1; } +/* This function returns a value > 0 if a descriptor was found, or 0 if none were found. + * A negative code is returned on error. */ +static int fetch_descs(struct vhost_virtqueue *vq) +{ + int ret; + + if (unlikely(vq->first_desc >= vq->ndescs)) { + vq->first_desc = 0; + vq->ndescs = 0; + } + + if (vq->ndescs) + return 1; + + for (ret = 1; + ret > 0 && vq->ndescs <= vhost_vq_num_batch_descs(vq); + ret = fetch_buf(vq)) + ; + + /* On success we expect some descs */ + BUG_ON(ret > 0 && !vq->ndescs); + return ret; +} + +/* Reverse the effects of fetch_descs */ +static void unfetch_descs(struct vhost_virtqueue *vq) +{ + int i; + + for (i = vq->first_desc; i < vq->ndescs; ++i) + if (!(vq->descs[i].flags & VRING_DESC_F_NEXT)) + vq->last_avail_idx -= 1; + vq->ndescs = 0; +} + /* This looks in the virtqueue and for the first available buffer, and converts * it to an iovec for convenient access. Since descriptors consist of some * number of output then some number of input descriptors, it's actually two @@ -2540,7 +2342,7 @@ static int fetch_descs(struct vhost_virtqueue *vq) * This function returns the descriptor number found, or vq->num (which is * never a valid descriptor number) if none was found. A negative code is * returned on error. */ -int vhost_get_vq_desc_batch(struct vhost_virtqueue *vq, +int vhost_get_vq_desc(struct vhost_virtqueue *vq, struct iovec iov[], unsigned int iov_size, unsigned int *out_num, unsigned int *in_num, struct vhost_log *log, unsigned int *log_num) @@ -2549,7 +2351,7 @@ int vhost_get_vq_desc_batch(struct vhost_virtqueue *vq, int i; if (ret <= 0) - goto err_fetch; + goto err; /* Now convert to IOV */ /* When we start there are none of either input nor output. */ @@ -2557,7 +2359,7 @@ int vhost_get_vq_desc_batch(struct vhost_virtqueue *vq, if (unlikely(log)) *log_num = 0; - for (i = 0; i < vq->ndescs; ++i) { + for (i = vq->first_desc; i < vq->ndescs; ++i) { unsigned iov_count = *in_num + *out_num; struct vhost_desc *desc = &vq->descs[i]; int access; @@ -2603,24 +2405,26 @@ int vhost_get_vq_desc_batch(struct vhost_virtqueue *vq, } ret = desc->id; + + if (!(desc->flags & VRING_DESC_F_NEXT)) + break; } - vq->ndescs = 0; + vq->first_desc = i + 1; return ret; err: - vhost_discard_vq_desc(vq, 1); -err_fetch: - vq->ndescs = 0; + unfetch_descs(vq); return ret; } -EXPORT_SYMBOL_GPL(vhost_get_vq_desc_batch); +EXPORT_SYMBOL_GPL(vhost_get_vq_desc); /* Reverse the effect of vhost_get_vq_desc. Useful for error handling. */ void vhost_discard_vq_desc(struct vhost_virtqueue *vq, int n) { + unfetch_descs(vq); vq->last_avail_idx -= n; } EXPORT_SYMBOL_GPL(vhost_discard_vq_desc); diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 87089d51490d..fed36af5c444 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -81,6 +81,7 @@ struct vhost_virtqueue { struct vhost_desc *descs; int ndescs; + int first_desc; int max_descs; struct file *kick; @@ -189,10 +190,6 @@ long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *arg bool vhost_vq_access_ok(struct vhost_virtqueue *vq); bool vhost_log_access_ok(struct vhost_dev *); -int vhost_get_vq_desc_batch(struct vhost_virtqueue *, - struct iovec iov[], unsigned int iov_count, - unsigned int *out_num, unsigned int *in_num, - struct vhost_log *log, unsigned int *log_num); int vhost_get_vq_desc(struct vhost_virtqueue *, struct iovec iov[], unsigned int iov_count, unsigned int *out_num, unsigned int *in_num, @@ -261,6 +258,8 @@ static inline void vhost_vq_set_backend(struct vhost_virtqueue *vq, void *private_data) { vq->private_data = private_data; + vq->ndescs = 0; + vq->first_desc = 0; } /** From patchwork Mon Jun 8 12:52:58 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 11593325 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 84521739 for ; Mon, 8 Jun 2020 12:55:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6B769206C3 for ; Mon, 8 Jun 2020 12:55:38 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="LDZmjQfx" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729302AbgFHMxF (ORCPT ); Mon, 8 Jun 2020 08:53:05 -0400 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:55285 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729256AbgFHMxE (ORCPT ); Mon, 8 Jun 2020 08:53:04 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591620782; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=VWXM+ipVrzQXYONFpt3zkOQmQtQZ231iT3DOSd7IMMo=; b=LDZmjQfxgrERNODrKN5vco4R+VcPjQkq+hkLns3T4piqfjDZ3mqXf/TqSSU3hXqFrTuEdm jMECf3RGgTiA9BlDnVnC69D4L5x1iZvbiiv236ZbHbHs44zsXIleWiNxlRI3MbQS3ml7vl HCwipz8rKAWmxx9eboixGDx6yGZ/lzg= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-296-0OQPRVUWPjmFwUJYnYqy0A-1; Mon, 08 Jun 2020 08:53:01 -0400 X-MC-Unique: 0OQPRVUWPjmFwUJYnYqy0A-1 Received: by mail-wm1-f71.google.com with SMTP id s15so5205211wmc.8 for ; Mon, 08 Jun 2020 05:53:01 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=VWXM+ipVrzQXYONFpt3zkOQmQtQZ231iT3DOSd7IMMo=; b=pUmmhQoDtwplOZdGuFITIL1hO2G5rKHly3x6PqSWQGhxqAUaHjVaxckX+p0Ncyb1bB gRCLKT8FcLjmxR6oQpC/SWmcZcbuKOEMarpTsUTc8XPhe52XWYkpWvDv+ArLTYqD2t/I VRTepIHX//gZAyoHQmv9utnm7Wy6TQydI58jCRz/ZGp/d8pKHlGnf0fZLpySG5RcQh4m yuX5/CMzIDtWP30xSwggMBZINq/FGOiwRKQXZn3c3O8vTDPP5AKihvlzzPF4mpGxO6Rf Xj9xeJFcnKaqtljtRGddFAdzeIi+Mom2MbV39GXYGsqC8f8avRoHR2Ek8aS2I4dggIHV kx2w== X-Gm-Message-State: AOAM530BFI5P3p8bRYjK3f12qwriAeq5JqTtd3lES83EFuGfM5rlUdOn ZwzefuwNyHGFIDuoymW24dErpY/8pySJdmgvCmmizO4ZPopi8Yercuma517rq8ey+2m69HhO5GJ FTT7OQ95jlypQ X-Received: by 2002:a1c:2002:: with SMTP id g2mr15880272wmg.132.1591620780152; Mon, 08 Jun 2020 05:53:00 -0700 (PDT) X-Google-Smtp-Source: ABdhPJw5q+0SXDT6Wdos2frrb3vvZ3yL2SrO2xQj04+9m7aTyGYJfEoe809o7V4AZJBXuQ14Gp89bw== X-Received: by 2002:a1c:2002:: with SMTP id g2mr15880253wmg.132.1591620779909; Mon, 08 Jun 2020 05:52:59 -0700 (PDT) Received: from redhat.com (bzq-109-64-41-91.red.bezeqint.net. [109.64.41.91]) by smtp.gmail.com with ESMTPSA id q11sm23292226wrv.67.2020.06.08.05.52.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2020 05:52:59 -0700 (PDT) Date: Mon, 8 Jun 2020 08:52:58 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, Jason Wang , eperezma@redhat.com Subject: [PATCH RFC v6 03/11] vhost/net: pass net specific struct pointer Message-ID: <20200608125238.728563-4-mst@redhat.com> References: <20200608125238.728563-1-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200608125238.728563-1-mst@redhat.com> X-Mailer: git-send-email 2.24.1.751.gd10ce2899c X-Mutt-Fcc: =sent Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org In preparation for further cleanup, pass net specific pointer to ubuf callbacks so we can move net specific fields out to net structures. Signed-off-by: Michael S. Tsirkin --- drivers/vhost/net.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index bf5e1d81ae25..ff594eec8ae3 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -94,7 +94,7 @@ struct vhost_net_ubuf_ref { */ atomic_t refcount; wait_queue_head_t wait; - struct vhost_virtqueue *vq; + struct vhost_net_virtqueue *nvq; }; #define VHOST_NET_BATCH 64 @@ -231,7 +231,7 @@ static void vhost_net_enable_zcopy(int vq) } static struct vhost_net_ubuf_ref * -vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy) +vhost_net_ubuf_alloc(struct vhost_net_virtqueue *nvq, bool zcopy) { struct vhost_net_ubuf_ref *ubufs; /* No zero copy backend? Nothing to count. */ @@ -242,7 +242,7 @@ vhost_net_ubuf_alloc(struct vhost_virtqueue *vq, bool zcopy) return ERR_PTR(-ENOMEM); atomic_set(&ubufs->refcount, 1); init_waitqueue_head(&ubufs->wait); - ubufs->vq = vq; + ubufs->nvq = nvq; return ubufs; } @@ -384,13 +384,13 @@ static void vhost_zerocopy_signal_used(struct vhost_net *net, static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) { struct vhost_net_ubuf_ref *ubufs = ubuf->ctx; - struct vhost_virtqueue *vq = ubufs->vq; + struct vhost_net_virtqueue *nvq = ubufs->nvq; int cnt; rcu_read_lock_bh(); /* set len to mark this desc buffers done DMA */ - vq->heads[ubuf->desc].len = success ? + nvq->vq.heads[ubuf->desc].in_len = success ? VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; cnt = vhost_net_ubuf_put(ubufs); @@ -402,7 +402,7 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) * less than 10% of times). */ if (cnt <= 1 || !(cnt % 16)) - vhost_poll_queue(&vq->poll); + vhost_poll_queue(&nvq->vq.poll); rcu_read_unlock_bh(); } @@ -1525,7 +1525,7 @@ static long vhost_net_set_backend(struct vhost_net *n, unsigned index, int fd) /* start polling new socket */ oldsock = vhost_vq_get_backend(vq); if (sock != oldsock) { - ubufs = vhost_net_ubuf_alloc(vq, + ubufs = vhost_net_ubuf_alloc(nvq, sock && vhost_sock_zcopy(sock)); if (IS_ERR(ubufs)) { r = PTR_ERR(ubufs); From patchwork Mon Jun 8 12:53:00 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 11593297 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DE062739 for ; Mon, 8 Jun 2020 12:53:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C401D20774 for ; Mon, 8 Jun 2020 12:53:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="gRUmgU32" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729704AbgFHMxb (ORCPT ); Mon, 8 Jun 2020 08:53:31 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:23930 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729630AbgFHMxQ (ORCPT ); Mon, 8 Jun 2020 08:53:16 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591620794; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=YC9C1bg85UqEARLoLzVVH0wVxPzUMhgdZVeMnCOVW8I=; b=gRUmgU326j1p6kGpqao0FSpSDCrPYIf0L1OKAiTke8et6l9xZPDqqlcMzXBORaXew9fyg0 wBCr3U29l8UWfRtEX9I7PQZ75wDVtXpDz/b4sCrLWCWVcb8b3KXSMHELLqfRJ9SNoUdeC/ RlLhjBXSidy/fcAv5rrNuywTC0/YrDQ= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-386-vb5_uQL1MzijG2CWAraDVg-1; Mon, 08 Jun 2020 08:53:03 -0400 X-MC-Unique: vb5_uQL1MzijG2CWAraDVg-1 Received: by mail-wm1-f69.google.com with SMTP id h6so3899325wmb.7 for ; Mon, 08 Jun 2020 05:53:03 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=YC9C1bg85UqEARLoLzVVH0wVxPzUMhgdZVeMnCOVW8I=; b=hOxo7ST6MjuGSgvGRu1rZU00LA2OrD38YBmz/R/CJu+JfxPO2awokFrosK0+TdCf17 brNo5rLN5uUPJODbRSq9dDJHwZGke7YHqd7CXM00ZOp7/WLm0pmNwhNnwiw+sVv/aHPY IsCrN7fOrlcThAaBySLrskZSW+67g1AG5tn6xcbUWIumnCK6fwwUR8T+CH1uRhtckaI4 749QK2w3fByABAMb/l8mosQHOQwe9bq6Vs+PpB3KegrNYw7+G0g6izsFgB/5b3Ctjs9c VmeiBYFpFE/pqZH4qy7rLwgYPq/Xsybw2waIGrEpmJYnTn94Nf7oZOtnJMntsfYLXqpP pZwA== X-Gm-Message-State: AOAM5324IJs0pOn1ofgvPY8azqV6DBHlUGXadokfZDikQ/Urcjyl+1X4 pK/LmK5s3d0BdyimZTFe6J7IV2JhJTgAuqfyVH3Xx1NRo+7n3214mciqBzgDEWZWHR7ITPx4ZRp LWNVoe36twFLc X-Received: by 2002:a1c:59c7:: with SMTP id n190mr15634972wmb.61.1591620782175; Mon, 08 Jun 2020 05:53:02 -0700 (PDT) X-Google-Smtp-Source: ABdhPJycvWcSZ9pgrB8OOPKZQyruJy8vStQkFo1WrrMhroFInHbRmdrcF8cq2oRf/qnvmhPPXJjLnQ== X-Received: by 2002:a1c:59c7:: with SMTP id n190mr15634952wmb.61.1591620781966; Mon, 08 Jun 2020 05:53:01 -0700 (PDT) Received: from redhat.com (bzq-109-64-41-91.red.bezeqint.net. [109.64.41.91]) by smtp.gmail.com with ESMTPSA id r12sm23319300wrc.22.2020.06.08.05.53.00 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2020 05:53:01 -0700 (PDT) Date: Mon, 8 Jun 2020 08:53:00 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, Jason Wang , eperezma@redhat.com Subject: [PATCH RFC v6 04/11] vhost: reorder functions Message-ID: <20200608125238.728563-5-mst@redhat.com> References: <20200608125238.728563-1-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200608125238.728563-1-mst@redhat.com> X-Mailer: git-send-email 2.24.1.751.gd10ce2899c X-Mutt-Fcc: =sent Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Reorder functions in the file to not rely on forward declarations, in preparation to making them static down the road. Signed-off-by: Michael S. Tsirkin --- drivers/vhost/vhost.c | 26 +++++++++++++------------- 1 file changed, 13 insertions(+), 13 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 41d6b132c234..334529ebecab 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -2429,19 +2429,6 @@ void vhost_discard_vq_desc(struct vhost_virtqueue *vq, int n) } EXPORT_SYMBOL_GPL(vhost_discard_vq_desc); -/* After we've used one of their buffers, we tell them about it. We'll then - * want to notify the guest, using eventfd. */ -int vhost_add_used(struct vhost_virtqueue *vq, unsigned int head, int len) -{ - struct vring_used_elem heads = { - cpu_to_vhost32(vq, head), - cpu_to_vhost32(vq, len) - }; - - return vhost_add_used_n(vq, &heads, 1); -} -EXPORT_SYMBOL_GPL(vhost_add_used); - static int __vhost_add_used_n(struct vhost_virtqueue *vq, struct vring_used_elem *heads, unsigned count) @@ -2511,6 +2498,19 @@ int vhost_add_used_n(struct vhost_virtqueue *vq, struct vring_used_elem *heads, } EXPORT_SYMBOL_GPL(vhost_add_used_n); +/* After we've used one of their buffers, we tell them about it. We'll then + * want to notify the guest, using eventfd. */ +int vhost_add_used(struct vhost_virtqueue *vq, unsigned int head, int len) +{ + struct vring_used_elem heads = { + cpu_to_vhost32(vq, head), + cpu_to_vhost32(vq, len) + }; + + return vhost_add_used_n(vq, &heads, 1); +} +EXPORT_SYMBOL_GPL(vhost_add_used); + static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq) { __u16 old, new; From patchwork Mon Jun 8 12:53:02 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 11593321 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id E8E77739 for ; Mon, 8 Jun 2020 12:55:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C66B72078D for ; Mon, 8 Jun 2020 12:55:25 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="W9QA6j6/" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729676AbgFHMzS (ORCPT ); Mon, 8 Jun 2020 08:55:18 -0400 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:46668 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729415AbgFHMxJ (ORCPT ); Mon, 8 Jun 2020 08:53:09 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591620786; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=/BMsXCp8as6XIEKwP+1OuBgzlgZF+LObUXAj5LC6nhc=; b=W9QA6j6/OYFYsMxRvvuIMRbCuYXxxMl+7aZXSUfqU1nTMuV+ukXKxOvhT40DOZuZiRSQ7f sbRf+Aqh3lD7ShU2Zg/31hqwX5mdwdbDSQ34Hi3rxaI99XzZzXjqx46kNXvtDlKKkWqHrD TXJgIJ/SF/VPCA3dKySR3jG/2pGlCCU= Received: from mail-wr1-f70.google.com (mail-wr1-f70.google.com [209.85.221.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-153-STkpqCmFOlaaZKU4U2Obig-1; Mon, 08 Jun 2020 08:53:05 -0400 X-MC-Unique: STkpqCmFOlaaZKU4U2Obig-1 Received: by mail-wr1-f70.google.com with SMTP id d6so7112752wrn.1 for ; Mon, 08 Jun 2020 05:53:05 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=/BMsXCp8as6XIEKwP+1OuBgzlgZF+LObUXAj5LC6nhc=; b=HgW8SbgCxN6vShXxG/OHgqW0yOL2cMdd9FmCPsYEfuUs87Wc1U6AUQN8rUgrm50nrx ikDeVHf+rbaijaig3IJXNzuE+BVvIzBtHz5L5fTpLwkd2amtKR6Nd/1yx8kuEdk4lCWt dl/VZk0VU4e3aVdK9gHlJ9XpeQcTxHaS0uEZTRWPxxGttB6h1M1IQY5LrnH8YZtFr90x mCkZYu1m8ZxFWuOOtv2wtJgtjhlMhgSXrhWzh2BFOWlaBjw29x6MwIyPknB78WcZ10RF /8pTHn3Bki3ZbQgDCOHiIgtuqvWpAt6gU5IU1N9OpJP+yNbwYT6cU4bzqwekceKPEnGT aiDQ== X-Gm-Message-State: AOAM530I1i65ANklR1BrUjoAikQ+mmo5PPLoFxBLde40XzFJ54k19IQu hyskpsUfDxiMj1GREqRd4ZZ6M05MANLw2WcOtnrYppy4YHntkak9peReEPRBzxDLdN/C4GPGgci 9HjHHBn2x2/0h X-Received: by 2002:a5d:40d0:: with SMTP id b16mr23153091wrq.218.1591620784270; Mon, 08 Jun 2020 05:53:04 -0700 (PDT) X-Google-Smtp-Source: ABdhPJw2VxXE5VOIOVPo0RMboZTneqAdwSqXaMGZre+l+cehJC8Sptf2UOfLNmzLTRHxVBL8MWleKA== X-Received: by 2002:a5d:40d0:: with SMTP id b16mr23153071wrq.218.1591620784029; Mon, 08 Jun 2020 05:53:04 -0700 (PDT) Received: from redhat.com (bzq-109-64-41-91.red.bezeqint.net. [109.64.41.91]) by smtp.gmail.com with ESMTPSA id q4sm22610888wma.47.2020.06.08.05.53.02 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2020 05:53:03 -0700 (PDT) Date: Mon, 8 Jun 2020 08:53:02 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, Jason Wang , eperezma@redhat.com Subject: [PATCH RFC v6 05/11] vhost: format-independent API for used buffers Message-ID: <20200608125238.728563-6-mst@redhat.com> References: <20200608125238.728563-1-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200608125238.728563-1-mst@redhat.com> X-Mailer: git-send-email 2.24.1.751.gd10ce2899c X-Mutt-Fcc: =sent Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Add a new API that doesn't assume used ring, heads, etc. For now, we keep the old APIs around to make it easier to convert drivers. Signed-off-by: Michael S. Tsirkin --- drivers/vhost/vhost.c | 52 ++++++++++++++++++++++++++++++++++--------- drivers/vhost/vhost.h | 17 +++++++++++++- 2 files changed, 58 insertions(+), 11 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index 334529ebecab..f4a6ff9ef77a 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -2339,13 +2339,12 @@ static void unfetch_descs(struct vhost_virtqueue *vq) * number of output then some number of input descriptors, it's actually two * iovecs, but we pack them into one and note how many of each there were. * - * This function returns the descriptor number found, or vq->num (which is - * never a valid descriptor number) if none was found. A negative code is - * returned on error. */ -int vhost_get_vq_desc(struct vhost_virtqueue *vq, - struct iovec iov[], unsigned int iov_size, - unsigned int *out_num, unsigned int *in_num, - struct vhost_log *log, unsigned int *log_num) + * This function returns a value > 0 if a descriptor was found, or 0 if none were found. + * A negative code is returned on error. */ +int vhost_get_avail_buf(struct vhost_virtqueue *vq, struct vhost_buf *buf, + struct iovec iov[], unsigned int iov_size, + unsigned int *out_num, unsigned int *in_num, + struct vhost_log *log, unsigned int *log_num) { int ret = fetch_descs(vq); int i; @@ -2358,6 +2357,8 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq, *out_num = *in_num = 0; if (unlikely(log)) *log_num = 0; + buf->in_len = buf->out_len = 0; + buf->descs = 0; for (i = vq->first_desc; i < vq->ndescs; ++i) { unsigned iov_count = *in_num + *out_num; @@ -2387,6 +2388,7 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq, /* If this is an input descriptor, * increment that count. */ *in_num += ret; + buf->in_len += desc->len; if (unlikely(log && ret)) { log[*log_num].addr = desc->addr; log[*log_num].len = desc->len; @@ -2402,9 +2404,11 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq, goto err; } *out_num += ret; + buf->out_len += desc->len; } - ret = desc->id; + buf->id = desc->id; + ++buf->descs; if (!(desc->flags & VRING_DESC_F_NEXT)) break; @@ -2412,14 +2416,22 @@ int vhost_get_vq_desc(struct vhost_virtqueue *vq, vq->first_desc = i + 1; - return ret; + return 1; err: unfetch_descs(vq); return ret; } -EXPORT_SYMBOL_GPL(vhost_get_vq_desc); +EXPORT_SYMBOL_GPL(vhost_get_avail_buf); + +/* Reverse the effect of vhost_get_avail_buf. Useful for error handling. */ +void vhost_discard_avail_bufs(struct vhost_virtqueue *vq, + struct vhost_buf *buf, unsigned count) +{ + vhost_discard_vq_desc(vq, count); +} +EXPORT_SYMBOL_GPL(vhost_discard_avail_bufs); /* Reverse the effect of vhost_get_vq_desc. Useful for error handling. */ void vhost_discard_vq_desc(struct vhost_virtqueue *vq, int n) @@ -2511,6 +2523,26 @@ int vhost_add_used(struct vhost_virtqueue *vq, unsigned int head, int len) } EXPORT_SYMBOL_GPL(vhost_add_used); +int vhost_put_used_buf(struct vhost_virtqueue *vq, struct vhost_buf *buf) +{ + return vhost_add_used(vq, buf->id, buf->in_len); +} +EXPORT_SYMBOL_GPL(vhost_put_used_buf); + +int vhost_put_used_n_bufs(struct vhost_virtqueue *vq, + struct vhost_buf *bufs, unsigned count) +{ + unsigned i; + + for (i = 0; i < count; ++i) { + vq->heads[i].id = cpu_to_vhost32(vq, bufs[i].id); + vq->heads[i].len = cpu_to_vhost32(vq, bufs[i].in_len); + } + + return vhost_add_used_n(vq, vq->heads, count); +} +EXPORT_SYMBOL_GPL(vhost_put_used_n_bufs); + static bool vhost_notify(struct vhost_dev *dev, struct vhost_virtqueue *vq) { __u16 old, new; diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index fed36af5c444..28eea0155efb 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -67,6 +67,13 @@ struct vhost_desc { u16 id; }; +struct vhost_buf { + u32 out_len; + u32 in_len; + u16 descs; + u16 id; +}; + /* The virtqueue structure describes a queue attached to a device. */ struct vhost_virtqueue { struct vhost_dev *dev; @@ -195,7 +202,12 @@ int vhost_get_vq_desc(struct vhost_virtqueue *, unsigned int *out_num, unsigned int *in_num, struct vhost_log *log, unsigned int *log_num); void vhost_discard_vq_desc(struct vhost_virtqueue *, int n); - +int vhost_get_avail_buf(struct vhost_virtqueue *, struct vhost_buf *buf, + struct iovec iov[], unsigned int iov_count, + unsigned int *out_num, unsigned int *in_num, + struct vhost_log *log, unsigned int *log_num); +void vhost_discard_avail_bufs(struct vhost_virtqueue *, + struct vhost_buf *, unsigned count); int vhost_vq_init_access(struct vhost_virtqueue *); int vhost_add_used(struct vhost_virtqueue *, unsigned int head, int len); int vhost_add_used_n(struct vhost_virtqueue *, struct vring_used_elem *heads, @@ -204,6 +216,9 @@ void vhost_add_used_and_signal(struct vhost_dev *, struct vhost_virtqueue *, unsigned int id, int len); void vhost_add_used_and_signal_n(struct vhost_dev *, struct vhost_virtqueue *, struct vring_used_elem *heads, unsigned count); +int vhost_put_used_buf(struct vhost_virtqueue *, struct vhost_buf *buf); +int vhost_put_used_n_bufs(struct vhost_virtqueue *, + struct vhost_buf *bufs, unsigned count); void vhost_signal(struct vhost_dev *, struct vhost_virtqueue *); void vhost_disable_notify(struct vhost_dev *, struct vhost_virtqueue *); bool vhost_vq_avail_empty(struct vhost_dev *, struct vhost_virtqueue *); From patchwork Mon Jun 8 12:53:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 11593291 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id D80A4739 for ; Mon, 8 Jun 2020 12:53:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A9B382078D for ; Mon, 8 Jun 2020 12:53:18 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="O5G902kC" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729674AbgFHMxR (ORCPT ); Mon, 8 Jun 2020 08:53:17 -0400 Received: from us-smtp-delivery-1.mimecast.com ([207.211.31.120]:30019 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729550AbgFHMxN (ORCPT ); Mon, 8 Jun 2020 08:53:13 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591620789; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=UNoiNEJvdgOZ9xjiajXEUBmq7bdVAGmYmXBWji52Kn0=; b=O5G902kCh0URdRJ4alI7mwEoO0ii785uUmN2SK4MRxNIPA4YwUZlaeaTG8W3AzAWL5zWpf 1rUUQnFQpH16DmdSFPxKmmAc6GlK7H/0FwmclcEIN1oJkfec3WfBUEgVRtD2SHDjvsWoqy BD3tQoUAyh8oM+ORaQaDptCLYohRK/0= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-159-rk_1xlpuPEGInTjGVcOJvg-1; Mon, 08 Jun 2020 08:53:08 -0400 X-MC-Unique: rk_1xlpuPEGInTjGVcOJvg-1 Received: by mail-wm1-f72.google.com with SMTP id u15so3900943wmm.5 for ; Mon, 08 Jun 2020 05:53:08 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=UNoiNEJvdgOZ9xjiajXEUBmq7bdVAGmYmXBWji52Kn0=; b=Aiz6uYpBhcqWzg4tlDrYZe0TP21TjSW6VhSHyCPcN/GN18LlqMA25mS6HrCapeiPiB kcoQmLd2XwaHrr2FC/iX0V4/R3cGBOtSMCnbkdDXB+BSj67aR4gryrJOtusEUoJfPiXs /xU06UoEwRhEkVjJ6elK/OIDXsj9xIvLKtCboPuWUBc5asPlIQ7h2fb14U4Wjvrh4xi1 v906ld6YiDLICMWBfBnlISOYt6L4RxspwZbRZYcksfVxhr7xrTeH2HueNTpuL7aEBGTx ga5su1coZO58nSn5UfsnLnGdVlZvIu5i/LelhCHwDuv09Qu5LKysvVGiMJwI3pl0HmKV sIsw== X-Gm-Message-State: AOAM533/e9ZcbrRvhnIZAYp2pXfoXUhAsxdnwJCyaLvUGYRIk/E7qfGm p+QRCi9VTD4imM9oja+mFRc+COyN2e1rhthxL8vCw+GxbuBae0YaL+6oTKWXesc29GOeyMNj24V AVJCet2Fin79J X-Received: by 2002:adf:afc7:: with SMTP id y7mr23198849wrd.173.1591620786945; Mon, 08 Jun 2020 05:53:06 -0700 (PDT) X-Google-Smtp-Source: ABdhPJw1raVCcCx7n7gNKfZPkb+mT/SCxRtgAXvz1MvXpSTDrUvB3qLrWNHZo4LE5x6MZN9KthGk9A== X-Received: by 2002:adf:afc7:: with SMTP id y7mr23198820wrd.173.1591620786507; Mon, 08 Jun 2020 05:53:06 -0700 (PDT) Received: from redhat.com (bzq-109-64-41-91.red.bezeqint.net. [109.64.41.91]) by smtp.gmail.com with ESMTPSA id 138sm23385105wma.23.2020.06.08.05.53.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2020 05:53:06 -0700 (PDT) Date: Mon, 8 Jun 2020 08:53:04 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, Jason Wang , eperezma@redhat.com Subject: [PATCH RFC v6 06/11] vhost/net: convert to new API: heads->bufs Message-ID: <20200608125238.728563-7-mst@redhat.com> References: <20200608125238.728563-1-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200608125238.728563-1-mst@redhat.com> X-Mailer: git-send-email 2.24.1.751.gd10ce2899c X-Mutt-Fcc: =sent Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Convert vhost net to use the new format-agnostic API. In particular, don't poke at vq internals such as the heads array. Signed-off-by: Michael S. Tsirkin --- drivers/vhost/net.c | 154 +++++++++++++++++++++++--------------------- 1 file changed, 82 insertions(+), 72 deletions(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index ff594eec8ae3..830fe84912a5 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -59,13 +59,13 @@ MODULE_PARM_DESC(experimental_zcopytx, "Enable Zero Copy TX;" * status internally; used for zerocopy tx only. */ /* Lower device DMA failed */ -#define VHOST_DMA_FAILED_LEN ((__force __virtio32)3) +#define VHOST_DMA_FAILED_LEN (3) /* Lower device DMA done */ -#define VHOST_DMA_DONE_LEN ((__force __virtio32)2) +#define VHOST_DMA_DONE_LEN (2) /* Lower device DMA in progress */ -#define VHOST_DMA_IN_PROGRESS ((__force __virtio32)1) +#define VHOST_DMA_IN_PROGRESS (1) /* Buffer unused */ -#define VHOST_DMA_CLEAR_LEN ((__force __virtio32)0) +#define VHOST_DMA_CLEAR_LEN (0) #define VHOST_DMA_IS_DONE(len) ((__force u32)(len) >= (__force u32)VHOST_DMA_DONE_LEN) @@ -112,9 +112,12 @@ struct vhost_net_virtqueue { /* last used idx for outstanding DMA zerocopy buffers */ int upend_idx; /* For TX, first used idx for DMA done zerocopy buffers - * For RX, number of batched heads + * For RX, number of batched bufs */ int done_idx; + /* Outstanding user bufs. UIO_MAXIOV in length. */ + /* TODO: we can make this smaller for sure. */ + struct vhost_buf *bufs; /* Number of XDP frames batched */ int batched_xdp; /* an array of userspace buffers info */ @@ -271,6 +274,8 @@ static void vhost_net_clear_ubuf_info(struct vhost_net *n) int i; for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { + kfree(n->vqs[i].bufs); + n->vqs[i].bufs = NULL; kfree(n->vqs[i].ubuf_info); n->vqs[i].ubuf_info = NULL; } @@ -282,6 +287,12 @@ static int vhost_net_set_ubuf_info(struct vhost_net *n) int i; for (i = 0; i < VHOST_NET_VQ_MAX; ++i) { + n->vqs[i].bufs = kmalloc_array(UIO_MAXIOV, + sizeof(*n->vqs[i].bufs), + GFP_KERNEL); + if (!n->vqs[i].bufs) + goto err; + zcopy = vhost_net_zcopy_mask & (0x1 << i); if (!zcopy) continue; @@ -364,18 +375,18 @@ static void vhost_zerocopy_signal_used(struct vhost_net *net, int j = 0; for (i = nvq->done_idx; i != nvq->upend_idx; i = (i + 1) % UIO_MAXIOV) { - if (vq->heads[i].len == VHOST_DMA_FAILED_LEN) + if (nvq->bufs[i].in_len == VHOST_DMA_FAILED_LEN) vhost_net_tx_err(net); - if (VHOST_DMA_IS_DONE(vq->heads[i].len)) { - vq->heads[i].len = VHOST_DMA_CLEAR_LEN; + if (VHOST_DMA_IS_DONE(nvq->bufs[i].in_len)) { + nvq->bufs[i].in_len = VHOST_DMA_CLEAR_LEN; ++j; } else break; } while (j) { add = min(UIO_MAXIOV - nvq->done_idx, j); - vhost_add_used_and_signal_n(vq->dev, vq, - &vq->heads[nvq->done_idx], add); + vhost_put_used_n_bufs(vq, &nvq->bufs[nvq->done_idx], add); + vhost_signal(vq->dev, vq); nvq->done_idx = (nvq->done_idx + add) % UIO_MAXIOV; j -= add; } @@ -390,7 +401,7 @@ static void vhost_zerocopy_callback(struct ubuf_info *ubuf, bool success) rcu_read_lock_bh(); /* set len to mark this desc buffers done DMA */ - nvq->vq.heads[ubuf->desc].in_len = success ? + nvq->bufs[ubuf->desc].in_len = success ? VHOST_DMA_DONE_LEN : VHOST_DMA_FAILED_LEN; cnt = vhost_net_ubuf_put(ubufs); @@ -452,7 +463,8 @@ static void vhost_net_signal_used(struct vhost_net_virtqueue *nvq) if (!nvq->done_idx) return; - vhost_add_used_and_signal_n(dev, vq, vq->heads, nvq->done_idx); + vhost_put_used_n_bufs(vq, nvq->bufs, nvq->done_idx); + vhost_signal(dev, vq); nvq->done_idx = 0; } @@ -558,6 +570,7 @@ static void vhost_net_busy_poll(struct vhost_net *net, static int vhost_net_tx_get_vq_desc(struct vhost_net *net, struct vhost_net_virtqueue *tnvq, + struct vhost_buf *buf, unsigned int *out_num, unsigned int *in_num, struct msghdr *msghdr, bool *busyloop_intr) { @@ -565,10 +578,10 @@ static int vhost_net_tx_get_vq_desc(struct vhost_net *net, struct vhost_virtqueue *rvq = &rnvq->vq; struct vhost_virtqueue *tvq = &tnvq->vq; - int r = vhost_get_vq_desc(tvq, tvq->iov, ARRAY_SIZE(tvq->iov), - out_num, in_num, NULL, NULL); + int r = vhost_get_avail_buf(tvq, buf, tvq->iov, ARRAY_SIZE(tvq->iov), + out_num, in_num, NULL, NULL); - if (r == tvq->num && tvq->busyloop_timeout) { + if (!r && tvq->busyloop_timeout) { /* Flush batched packets first */ if (!vhost_sock_zcopy(vhost_vq_get_backend(tvq))) vhost_tx_batch(net, tnvq, @@ -577,8 +590,8 @@ static int vhost_net_tx_get_vq_desc(struct vhost_net *net, vhost_net_busy_poll(net, rvq, tvq, busyloop_intr, false); - r = vhost_get_vq_desc(tvq, tvq->iov, ARRAY_SIZE(tvq->iov), - out_num, in_num, NULL, NULL); + r = vhost_get_avail_buf(tvq, buf, tvq->iov, ARRAY_SIZE(tvq->iov), + out_num, in_num, NULL, NULL); } return r; @@ -607,6 +620,7 @@ static size_t init_iov_iter(struct vhost_virtqueue *vq, struct iov_iter *iter, static int get_tx_bufs(struct vhost_net *net, struct vhost_net_virtqueue *nvq, + struct vhost_buf *buf, struct msghdr *msg, unsigned int *out, unsigned int *in, size_t *len, bool *busyloop_intr) @@ -614,9 +628,9 @@ static int get_tx_bufs(struct vhost_net *net, struct vhost_virtqueue *vq = &nvq->vq; int ret; - ret = vhost_net_tx_get_vq_desc(net, nvq, out, in, msg, busyloop_intr); + ret = vhost_net_tx_get_vq_desc(net, nvq, buf, out, in, msg, busyloop_intr); - if (ret < 0 || ret == vq->num) + if (ret <= 0) return ret; if (*in) { @@ -761,7 +775,7 @@ static void handle_tx_copy(struct vhost_net *net, struct socket *sock) struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; struct vhost_virtqueue *vq = &nvq->vq; unsigned out, in; - int head; + int ret; struct msghdr msg = { .msg_name = NULL, .msg_namelen = 0, @@ -773,6 +787,7 @@ static void handle_tx_copy(struct vhost_net *net, struct socket *sock) int err; int sent_pkts = 0; bool sock_can_batch = (sock->sk->sk_sndbuf == INT_MAX); + struct vhost_buf buf; do { bool busyloop_intr = false; @@ -780,13 +795,13 @@ static void handle_tx_copy(struct vhost_net *net, struct socket *sock) if (nvq->done_idx == VHOST_NET_BATCH) vhost_tx_batch(net, nvq, sock, &msg); - head = get_tx_bufs(net, nvq, &msg, &out, &in, &len, - &busyloop_intr); + ret = get_tx_bufs(net, nvq, &buf, &msg, &out, &in, &len, + &busyloop_intr); /* On error, stop handling until the next kick. */ - if (unlikely(head < 0)) + if (unlikely(ret < 0)) break; /* Nothing new? Wait for eventfd to tell us they refilled. */ - if (head == vq->num) { + if (!ret) { if (unlikely(busyloop_intr)) { vhost_poll_queue(&vq->poll); } else if (unlikely(vhost_enable_notify(&net->dev, @@ -808,7 +823,7 @@ static void handle_tx_copy(struct vhost_net *net, struct socket *sock) goto done; } else if (unlikely(err != -ENOSPC)) { vhost_tx_batch(net, nvq, sock, &msg); - vhost_discard_vq_desc(vq, 1); + vhost_discard_avail_bufs(vq, &buf, 1); vhost_net_enable_vq(net, vq); break; } @@ -829,7 +844,7 @@ static void handle_tx_copy(struct vhost_net *net, struct socket *sock) /* TODO: Check specific error and bomb out unless ENOBUFS? */ err = sock->ops->sendmsg(sock, &msg, len); if (unlikely(err < 0)) { - vhost_discard_vq_desc(vq, 1); + vhost_discard_avail_bufs(vq, &buf, 1); vhost_net_enable_vq(net, vq); break; } @@ -837,8 +852,7 @@ static void handle_tx_copy(struct vhost_net *net, struct socket *sock) pr_debug("Truncated TX packet: len %d != %zd\n", err, len); done: - vq->heads[nvq->done_idx].id = cpu_to_vhost32(vq, head); - vq->heads[nvq->done_idx].len = 0; + nvq->bufs[nvq->done_idx] = buf; ++nvq->done_idx; } while (likely(!vhost_exceeds_weight(vq, ++sent_pkts, total_len))); @@ -850,7 +864,7 @@ static void handle_tx_zerocopy(struct vhost_net *net, struct socket *sock) struct vhost_net_virtqueue *nvq = &net->vqs[VHOST_NET_VQ_TX]; struct vhost_virtqueue *vq = &nvq->vq; unsigned out, in; - int head; + int ret; struct msghdr msg = { .msg_name = NULL, .msg_namelen = 0, @@ -864,6 +878,7 @@ static void handle_tx_zerocopy(struct vhost_net *net, struct socket *sock) struct vhost_net_ubuf_ref *uninitialized_var(ubufs); bool zcopy_used; int sent_pkts = 0; + struct vhost_buf buf; do { bool busyloop_intr; @@ -872,13 +887,13 @@ static void handle_tx_zerocopy(struct vhost_net *net, struct socket *sock) vhost_zerocopy_signal_used(net, vq); busyloop_intr = false; - head = get_tx_bufs(net, nvq, &msg, &out, &in, &len, - &busyloop_intr); + ret = get_tx_bufs(net, nvq, &buf, &msg, &out, &in, &len, + &busyloop_intr); /* On error, stop handling until the next kick. */ - if (unlikely(head < 0)) + if (unlikely(ret < 0)) break; /* Nothing new? Wait for eventfd to tell us they refilled. */ - if (head == vq->num) { + if (!ret) { if (unlikely(busyloop_intr)) { vhost_poll_queue(&vq->poll); } else if (unlikely(vhost_enable_notify(&net->dev, vq))) { @@ -897,8 +912,8 @@ static void handle_tx_zerocopy(struct vhost_net *net, struct socket *sock) struct ubuf_info *ubuf; ubuf = nvq->ubuf_info + nvq->upend_idx; - vq->heads[nvq->upend_idx].id = cpu_to_vhost32(vq, head); - vq->heads[nvq->upend_idx].len = VHOST_DMA_IN_PROGRESS; + nvq->bufs[nvq->upend_idx] = buf; + nvq->bufs[nvq->upend_idx].in_len = VHOST_DMA_IN_PROGRESS; ubuf->callback = vhost_zerocopy_callback; ubuf->ctx = nvq->ubufs; ubuf->desc = nvq->upend_idx; @@ -930,17 +945,19 @@ static void handle_tx_zerocopy(struct vhost_net *net, struct socket *sock) nvq->upend_idx = ((unsigned)nvq->upend_idx - 1) % UIO_MAXIOV; } - vhost_discard_vq_desc(vq, 1); + vhost_discard_avail_bufs(vq, &buf, 1); vhost_net_enable_vq(net, vq); break; } if (err != len) pr_debug("Truncated TX packet: " " len %d != %zd\n", err, len); - if (!zcopy_used) - vhost_add_used_and_signal(&net->dev, vq, head, 0); - else + if (!zcopy_used) { + vhost_put_used_buf(vq, &buf); + vhost_signal(&net->dev, vq); + } else { vhost_zerocopy_signal_used(net, vq); + } vhost_net_tx_packet(net); } while (likely(!vhost_exceeds_weight(vq, ++sent_pkts, total_len))); } @@ -1004,7 +1021,7 @@ static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk, int len = peek_head_len(rnvq, sk); if (!len && rvq->busyloop_timeout) { - /* Flush batched heads first */ + /* Flush batched bufs first */ vhost_net_signal_used(rnvq); /* Both tx vq and rx socket were polled here */ vhost_net_busy_poll(net, rvq, tvq, busyloop_intr, true); @@ -1022,11 +1039,11 @@ static int vhost_net_rx_peek_head_len(struct vhost_net *net, struct sock *sk, * @iovcount - returned count of io vectors we fill * @log - vhost log * @log_num - log offset - * @quota - headcount quota, 1 for big buffer - * returns number of buffer heads allocated, negative on error + * @quota - bufcount quota, 1 for big buffer + * returns number of buffers allocated, negative on error */ static int get_rx_bufs(struct vhost_virtqueue *vq, - struct vring_used_elem *heads, + struct vhost_buf *bufs, int datalen, unsigned *iovcount, struct vhost_log *log, @@ -1035,30 +1052,24 @@ static int get_rx_bufs(struct vhost_virtqueue *vq, { unsigned int out, in; int seg = 0; - int headcount = 0; - unsigned d; + int bufcount = 0; int r, nlogs = 0; /* len is always initialized before use since we are always called with * datalen > 0. */ u32 uninitialized_var(len); - while (datalen > 0 && headcount < quota) { + while (datalen > 0 && bufcount < quota) { if (unlikely(seg >= UIO_MAXIOV)) { r = -ENOBUFS; goto err; } - r = vhost_get_vq_desc(vq, vq->iov + seg, - ARRAY_SIZE(vq->iov) - seg, &out, - &in, log, log_num); - if (unlikely(r < 0)) + r = vhost_get_avail_buf(vq, bufs + bufcount, vq->iov + seg, + ARRAY_SIZE(vq->iov) - seg, &out, + &in, log, log_num); + if (unlikely(r <= 0)) goto err; - d = r; - if (d == vq->num) { - r = 0; - goto err; - } if (unlikely(out || in <= 0)) { vq_err(vq, "unexpected descriptor format for RX: " "out %d, in %d\n", out, in); @@ -1069,14 +1080,12 @@ static int get_rx_bufs(struct vhost_virtqueue *vq, nlogs += *log_num; log += *log_num; } - heads[headcount].id = cpu_to_vhost32(vq, d); len = iov_length(vq->iov + seg, in); - heads[headcount].len = cpu_to_vhost32(vq, len); datalen -= len; - ++headcount; + ++bufcount; seg += in; } - heads[headcount - 1].len = cpu_to_vhost32(vq, len + datalen); + bufs[bufcount - 1].in_len = len + datalen; *iovcount = seg; if (unlikely(log)) *log_num = nlogs; @@ -1086,9 +1095,9 @@ static int get_rx_bufs(struct vhost_virtqueue *vq, r = UIO_MAXIOV + 1; goto err; } - return headcount; + return bufcount; err: - vhost_discard_vq_desc(vq, headcount); + vhost_discard_avail_bufs(vq, bufs, bufcount); return r; } @@ -1113,7 +1122,7 @@ static void handle_rx(struct vhost_net *net) }; size_t total_len = 0; int err, mergeable; - s16 headcount; + int bufcount; size_t vhost_hlen, sock_hlen; size_t vhost_len, sock_len; bool busyloop_intr = false; @@ -1147,14 +1156,14 @@ static void handle_rx(struct vhost_net *net) break; sock_len += sock_hlen; vhost_len = sock_len + vhost_hlen; - headcount = get_rx_bufs(vq, vq->heads + nvq->done_idx, - vhost_len, &in, vq_log, &log, - likely(mergeable) ? UIO_MAXIOV : 1); + bufcount = get_rx_bufs(vq, nvq->bufs + nvq->done_idx, + vhost_len, &in, vq_log, &log, + likely(mergeable) ? UIO_MAXIOV : 1); /* On error, stop handling until the next kick. */ - if (unlikely(headcount < 0)) + if (unlikely(bufcount < 0)) goto out; /* OK, now we need to know about added descriptors. */ - if (!headcount) { + if (!bufcount) { if (unlikely(busyloop_intr)) { vhost_poll_queue(&vq->poll); } else if (unlikely(vhost_enable_notify(&net->dev, vq))) { @@ -1171,7 +1180,7 @@ static void handle_rx(struct vhost_net *net) if (nvq->rx_ring) msg.msg_control = vhost_net_buf_consume(&nvq->rxq); /* On overrun, truncate and discard */ - if (unlikely(headcount > UIO_MAXIOV)) { + if (unlikely(bufcount > UIO_MAXIOV)) { iov_iter_init(&msg.msg_iter, READ, vq->iov, 1, 1); err = sock->ops->recvmsg(sock, &msg, 1, MSG_DONTWAIT | MSG_TRUNC); @@ -1195,7 +1204,7 @@ static void handle_rx(struct vhost_net *net) if (unlikely(err != sock_len)) { pr_debug("Discarded rx packet: " " len %d, expected %zd\n", err, sock_len); - vhost_discard_vq_desc(vq, headcount); + vhost_discard_avail_bufs(vq, nvq->bufs + nvq->done_idx, bufcount); continue; } /* Supply virtio_net_hdr if VHOST_NET_F_VIRTIO_NET_HDR */ @@ -1214,15 +1223,15 @@ static void handle_rx(struct vhost_net *net) } /* TODO: Should check and handle checksum. */ - num_buffers = cpu_to_vhost16(vq, headcount); + num_buffers = cpu_to_vhost16(vq, bufcount); if (likely(mergeable) && copy_to_iter(&num_buffers, sizeof num_buffers, &fixup) != sizeof num_buffers) { vq_err(vq, "Failed num_buffers write"); - vhost_discard_vq_desc(vq, headcount); + vhost_discard_avail_bufs(vq, nvq->bufs + nvq->done_idx, bufcount); goto out; } - nvq->done_idx += headcount; + nvq->done_idx += bufcount; if (nvq->done_idx > VHOST_NET_BATCH) vhost_net_signal_used(nvq); if (unlikely(vq_log)) @@ -1314,6 +1323,7 @@ static int vhost_net_open(struct inode *inode, struct file *f) n->vqs[VHOST_NET_VQ_TX].vq.handle_kick = handle_tx_kick; n->vqs[VHOST_NET_VQ_RX].vq.handle_kick = handle_rx_kick; for (i = 0; i < VHOST_NET_VQ_MAX; i++) { + n->vqs[i].bufs = NULL; n->vqs[i].ubufs = NULL; n->vqs[i].ubuf_info = NULL; n->vqs[i].upend_idx = 0; From patchwork Mon Jun 8 12:53:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. 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[109.64.41.91]) by smtp.gmail.com with ESMTPSA id z16sm23295568wrm.70.2020.06.08.05.53.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2020 05:53:08 -0700 (PDT) Date: Mon, 8 Jun 2020 08:53:06 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, Jason Wang , eperezma@redhat.com Subject: [PATCH RFC v6 07/11] vhost/net: avoid iov length math Message-ID: <20200608125238.728563-8-mst@redhat.com> References: <20200608125238.728563-1-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200608125238.728563-1-mst@redhat.com> X-Mailer: git-send-email 2.24.1.751.gd10ce2899c X-Mutt-Fcc: =sent Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Now that API exposes buffer length, we no longer need to scan IOVs to figure it out. Signed-off-by: Michael S. Tsirkin --- drivers/vhost/net.c | 8 +++----- 1 file changed, 3 insertions(+), 5 deletions(-) diff --git a/drivers/vhost/net.c b/drivers/vhost/net.c index 830fe84912a5..0b509be8d7b1 100644 --- a/drivers/vhost/net.c +++ b/drivers/vhost/net.c @@ -607,11 +607,9 @@ static bool vhost_exceeds_maxpend(struct vhost_net *net) } static size_t init_iov_iter(struct vhost_virtqueue *vq, struct iov_iter *iter, - size_t hdr_size, int out) + size_t len, size_t hdr_size, int out) { /* Skip header. TODO: support TSO. */ - size_t len = iov_length(vq->iov, out); - iov_iter_init(iter, WRITE, vq->iov, out, len); iov_iter_advance(iter, hdr_size); @@ -640,7 +638,7 @@ static int get_tx_bufs(struct vhost_net *net, } /* Sanity check */ - *len = init_iov_iter(vq, &msg->msg_iter, nvq->vhost_hlen, *out); + *len = init_iov_iter(vq, &msg->msg_iter, buf->out_len, nvq->vhost_hlen, *out); if (*len == 0) { vq_err(vq, "Unexpected header len for TX: %zd expected %zd\n", *len, nvq->vhost_hlen); @@ -1080,7 +1078,7 @@ static int get_rx_bufs(struct vhost_virtqueue *vq, nlogs += *log_num; log += *log_num; } - len = iov_length(vq->iov + seg, in); + len = bufs[bufcount].in_len; datalen -= len; ++bufcount; seg += in; From patchwork Mon Jun 8 12:53:08 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 11593305 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 938F790 for ; Mon, 8 Jun 2020 12:54:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 79237206C3 for ; Mon, 8 Jun 2020 12:54:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="cdK3hBal" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729822AbgFHMyY (ORCPT ); Mon, 8 Jun 2020 08:54:24 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:22729 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729628AbgFHMxP (ORCPT ); Mon, 8 Jun 2020 08:53:15 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591620793; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=nNh1TL7xZUtXOusVSg8tIG35kTb/6beDbMDeGMbkL8c=; b=cdK3hBalYnQTZ2ivoNup29kX+WgRgCaAnDsw5wfyGBdugUnta7zGmGaDV+15nJQns5GPRJ 3GryBGOPIok8qhGcXLqe2hE9foMQtYKpzJzxjWt4OCmt5QWp2ExK7hHLytKKm+6LttVg4K zxoZmC//Jkzvnn47x3BXU0ECh6klymA= Received: from mail-wm1-f72.google.com (mail-wm1-f72.google.com [209.85.128.72]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-284-at4Dy-VVPtiDA9qVN3DLgg-1; Mon, 08 Jun 2020 08:53:12 -0400 X-MC-Unique: at4Dy-VVPtiDA9qVN3DLgg-1 Received: by mail-wm1-f72.google.com with SMTP id h6so3899475wmb.7 for ; Mon, 08 Jun 2020 05:53:11 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=nNh1TL7xZUtXOusVSg8tIG35kTb/6beDbMDeGMbkL8c=; b=MR1yoQdbL6vvmm/YawcFIFdoZQJkv3Dqegl+KUdRA+i9Ep2OPGLcAHFVWI6Vz4OIsl 8Ts/vSbi5CsClFzzEIhXZ9gZqlkZ98k2XkkOfoAVC0kHAZI5hdRWb7FWEE7vi5V60J3d tqUWpyPmT4DYxNriZlx+QrJCgUQu0HtA6CmwwXOy/fjrsUExdytuMesvmoEcJCrhzXcE RGj3BjjckdixV85ERiPm4cSW9q2puV8lMzZeGHHGQuevMDzoHVdwApuYKC8ApU00FmFN q+cCzQl5SRKMqzWc98UVtyZZAEzu2I/27Kcbic0ILieTBYleTNdLvhYF9619wBSDp29+ jarw== X-Gm-Message-State: AOAM533lT7+vSl7NBldzugrAZbX6rMorb+tM/DU+8ecTEn8ne9QZ5PVF 5mqEVIwekFMXxwP7J/VQF3FkzyeMmLIMHRAY4cQX9hwVane+jnxhXues2ZS1pMtyyCLxjVfpbsh /f58FZY0QKeuo X-Received: by 2002:a5d:4b47:: with SMTP id w7mr22414159wrs.234.1591620790801; Mon, 08 Jun 2020 05:53:10 -0700 (PDT) X-Google-Smtp-Source: ABdhPJweTCKDLbfiVGUFqWREKS9iQ8j4XUwzsDXWV07w/+PxSXiYAJVsAr7kpiUE/TGQ+cExzBaktw== X-Received: by 2002:a5d:4b47:: with SMTP id w7mr22414144wrs.234.1591620790552; Mon, 08 Jun 2020 05:53:10 -0700 (PDT) Received: from redhat.com (bzq-109-64-41-91.red.bezeqint.net. [109.64.41.91]) by smtp.gmail.com with ESMTPSA id h15sm22578283wrt.73.2020.06.08.05.53.09 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2020 05:53:10 -0700 (PDT) Date: Mon, 8 Jun 2020 08:53:08 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, Jason Wang , eperezma@redhat.com Subject: [PATCH RFC v6 08/11] vhost/test: convert to the buf API Message-ID: <20200608125238.728563-9-mst@redhat.com> References: <20200608125238.728563-1-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200608125238.728563-1-mst@redhat.com> X-Mailer: git-send-email 2.24.1.751.gd10ce2899c X-Mutt-Fcc: =sent Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Signed-off-by: Michael S. Tsirkin --- drivers/vhost/test.c | 20 +++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/drivers/vhost/test.c b/drivers/vhost/test.c index 7d69778aaa26..12304eb8da15 100644 --- a/drivers/vhost/test.c +++ b/drivers/vhost/test.c @@ -44,9 +44,10 @@ static void handle_vq(struct vhost_test *n) { struct vhost_virtqueue *vq = &n->vqs[VHOST_TEST_VQ]; unsigned out, in; - int head; + int ret; size_t len, total_len = 0; void *private; + struct vhost_buf buf; mutex_lock(&vq->mutex); private = vhost_vq_get_backend(vq); @@ -58,15 +59,15 @@ static void handle_vq(struct vhost_test *n) vhost_disable_notify(&n->dev, vq); for (;;) { - head = vhost_get_vq_desc(vq, vq->iov, - ARRAY_SIZE(vq->iov), - &out, &in, - NULL, NULL); + ret = vhost_get_avail_buf(vq, &buf, vq->iov, + ARRAY_SIZE(vq->iov), + &out, &in, + NULL, NULL); /* On error, stop handling until the next kick. */ - if (unlikely(head < 0)) + if (unlikely(ret < 0)) break; /* Nothing new? Wait for eventfd to tell us they refilled. */ - if (head == vq->num) { + if (!ret) { if (unlikely(vhost_enable_notify(&n->dev, vq))) { vhost_disable_notify(&n->dev, vq); continue; @@ -78,13 +79,14 @@ static void handle_vq(struct vhost_test *n) "out %d, int %d\n", out, in); break; } - len = iov_length(vq->iov, out); + len = buf.out_len; /* Sanity check */ if (!len) { vq_err(vq, "Unexpected 0 len for TX\n"); break; } - vhost_add_used_and_signal(&n->dev, vq, head, 0); + vhost_put_used_buf(vq, &buf); + vhost_signal(&n->dev, vq); total_len += len; if (unlikely(vhost_exceeds_weight(vq, 0, total_len))) break; From patchwork Mon Jun 8 12:53:10 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 11593299 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DCCDF90 for ; Mon, 8 Jun 2020 12:53:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BF9162078C for ; Mon, 8 Jun 2020 12:53:45 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="BYvmr1UQ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729696AbgFHMxe (ORCPT ); Mon, 8 Jun 2020 08:53:34 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:42771 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729680AbgFHMxU (ORCPT ); Mon, 8 Jun 2020 08:53:20 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591620797; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=dyvL3TJdoghmFE7taHXWfXC0TleKg1Dbjs9VDE83TZ8=; b=BYvmr1UQHFs06SSSmg1gsc0PmwtfGWrLpg88SoV5YPqB95RPfjApgFxfK5PAXtUmFndvvc fOnRmmHZofbqm4voWNi8GDGBUOoroMzPyqRpddj5tlEFNJPCIPLLJlCmOCICGGPjRxWyln KmmptyKz81LkrBC72Z0SSd5xpitIUbg= Received: from mail-wr1-f71.google.com (mail-wr1-f71.google.com [209.85.221.71]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-152-KYxnFtmANsyAOyy3jyXzaA-1; Mon, 08 Jun 2020 08:53:14 -0400 X-MC-Unique: KYxnFtmANsyAOyy3jyXzaA-1 Received: by mail-wr1-f71.google.com with SMTP id t5so7100452wro.20 for ; Mon, 08 Jun 2020 05:53:14 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=dyvL3TJdoghmFE7taHXWfXC0TleKg1Dbjs9VDE83TZ8=; b=hhOyQEq21qDyoXt5zl7+jqq/BUpTm4VG8b6qxXknHPo4z6JOnB2vSmFNpWg6bHGEXR lfbhAWEeBKEJVuwi7LY4IdSoDvHV9bG5TINbto+n76fjsYjd8qzvhIOX57ZY9F+qTaS1 IfIcIJPoTpaageUfxChBqOAMqNM32A3VCAeJYdfsItaZuVpo72ZcHQpqqDzDfqIEivLW byhiE399GAZLYSF1It9BSF2lSj1xZy2lRDzqAwSYGXglg9zyx55s8pdYgX+XnNXFC+nf 3q1cfpFvNE8KVOCEWc71RnzlYWJnhMUFttirAlzFru7ehDk/QlHj0895xDWkzzTFobhr H1vw== X-Gm-Message-State: AOAM533XGTPfx6cO2wYgL6c1lEwIsTPR+5Ls/lQZHKf7QaySQ24jl8kk jYkXFcvHf5Kof/9dGqw7O+sSGkJLrf7oC9we26SyunUgv2za5sy+fu+3HS2rtey4gyq08QEXh3J qBfHjVyTh7abV X-Received: by 2002:a1c:e057:: with SMTP id x84mr11558971wmg.160.1591620793223; Mon, 08 Jun 2020 05:53:13 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwqwMNkCKTETN7JGC4nwscfaMZU/pGcpvDzTqjt0cctLuLGHFIzQ7M89IPA0fnMBjuzyXlRPQ== X-Received: by 2002:a1c:e057:: with SMTP id x84mr11558941wmg.160.1591620792903; Mon, 08 Jun 2020 05:53:12 -0700 (PDT) Received: from redhat.com (bzq-109-64-41-91.red.bezeqint.net. [109.64.41.91]) by smtp.gmail.com with ESMTPSA id o6sm2030284wmc.39.2020.06.08.05.53.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2020 05:53:12 -0700 (PDT) Date: Mon, 8 Jun 2020 08:53:10 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, Jason Wang , eperezma@redhat.com, Paolo Bonzini , Stefan Hajnoczi Subject: [PATCH RFC v6 09/11] vhost/scsi: switch to buf APIs Message-ID: <20200608125238.728563-10-mst@redhat.com> References: <20200608125238.728563-1-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200608125238.728563-1-mst@redhat.com> X-Mailer: git-send-email 2.24.1.751.gd10ce2899c X-Mutt-Fcc: =sent Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Switch to buf APIs. Doing this exposes a spec violation in vhost scsi: all used bufs are marked with length 0. Fix that is left for another day. Signed-off-by: Michael S. Tsirkin --- drivers/vhost/scsi.c | 73 ++++++++++++++++++++++++++------------------ 1 file changed, 44 insertions(+), 29 deletions(-) diff --git a/drivers/vhost/scsi.c b/drivers/vhost/scsi.c index 0cbaa0b3893d..a5cdd4c01a3a 100644 --- a/drivers/vhost/scsi.c +++ b/drivers/vhost/scsi.c @@ -71,8 +71,8 @@ struct vhost_scsi_inflight { }; struct vhost_scsi_cmd { - /* Descriptor from vhost_get_vq_desc() for virt_queue segment */ - int tvc_vq_desc; + /* Descriptor from vhost_get_avail_buf() for virt_queue segment */ + struct vhost_buf tvc_vq_desc; /* virtio-scsi initiator task attribute */ int tvc_task_attr; /* virtio-scsi response incoming iovecs */ @@ -213,7 +213,7 @@ struct vhost_scsi { * Context for processing request and control queue operations. */ struct vhost_scsi_ctx { - int head; + struct vhost_buf buf; unsigned int out, in; size_t req_size, rsp_size; size_t out_size, in_size; @@ -443,6 +443,20 @@ static int vhost_scsi_check_stop_free(struct se_cmd *se_cmd) return target_put_sess_cmd(se_cmd); } +/* Signal to guest that request finished with no input buffer. */ +/* TODO calling this when writing into buffer and most likely a bug */ +static void vhost_scsi_signal_noinput(struct vhost_dev *vdev, + struct vhost_virtqueue *vq, + struct vhost_buf *bufp) +{ + struct vhost_buf buf = *bufp; + + buf.in_len = 0; + vhost_put_used_buf(vq, &buf); + vhost_signal(vdev, vq); +} + + static void vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) { @@ -450,7 +464,8 @@ vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) struct virtio_scsi_event *event = &evt->event; struct virtio_scsi_event __user *eventp; unsigned out, in; - int head, ret; + struct vhost_buf buf; + int ret; if (!vhost_vq_get_backend(vq)) { vs->vs_events_missed = true; @@ -459,14 +474,14 @@ vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) again: vhost_disable_notify(&vs->dev, vq); - head = vhost_get_vq_desc(vq, vq->iov, - ARRAY_SIZE(vq->iov), &out, &in, - NULL, NULL); - if (head < 0) { + ret = vhost_get_avail_buf(vq, &buf, + vq->iov, ARRAY_SIZE(vq->iov), &out, &in, + NULL, NULL); + if (ret < 0) { vs->vs_events_missed = true; return; } - if (head == vq->num) { + if (!ret) { if (vhost_enable_notify(&vs->dev, vq)) goto again; vs->vs_events_missed = true; @@ -488,7 +503,7 @@ vhost_scsi_do_evt_work(struct vhost_scsi *vs, struct vhost_scsi_evt *evt) eventp = vq->iov[out].iov_base; ret = __copy_to_user(eventp, event, sizeof(*event)); if (!ret) - vhost_add_used_and_signal(&vs->dev, vq, head, 0); + vhost_scsi_signal_noinput(&vs->dev, vq, &buf); else vq_err(vq, "Faulted on vhost_scsi_send_event\n"); } @@ -549,7 +564,7 @@ static void vhost_scsi_complete_cmd_work(struct vhost_work *work) ret = copy_to_iter(&v_rsp, sizeof(v_rsp), &iov_iter); if (likely(ret == sizeof(v_rsp))) { struct vhost_scsi_virtqueue *q; - vhost_add_used(cmd->tvc_vq, cmd->tvc_vq_desc, 0); + vhost_put_used_buf(cmd->tvc_vq, &cmd->tvc_vq_desc); q = container_of(cmd->tvc_vq, struct vhost_scsi_virtqueue, vq); vq = q - vs->vqs; __set_bit(vq, signal); @@ -793,7 +808,7 @@ static void vhost_scsi_submission_work(struct work_struct *work) static void vhost_scsi_send_bad_target(struct vhost_scsi *vs, struct vhost_virtqueue *vq, - int head, unsigned out) + struct vhost_buf *buf, unsigned out) { struct virtio_scsi_cmd_resp __user *resp; struct virtio_scsi_cmd_resp rsp; @@ -804,7 +819,7 @@ vhost_scsi_send_bad_target(struct vhost_scsi *vs, resp = vq->iov[out].iov_base; ret = __copy_to_user(resp, &rsp, sizeof(rsp)); if (!ret) - vhost_add_used_and_signal(&vs->dev, vq, head, 0); + vhost_scsi_signal_noinput(&vs->dev, vq, buf); else pr_err("Faulted on virtio_scsi_cmd_resp\n"); } @@ -813,21 +828,21 @@ static int vhost_scsi_get_desc(struct vhost_scsi *vs, struct vhost_virtqueue *vq, struct vhost_scsi_ctx *vc) { - int ret = -ENXIO; + int r, ret = -ENXIO; - vc->head = vhost_get_vq_desc(vq, vq->iov, - ARRAY_SIZE(vq->iov), &vc->out, &vc->in, - NULL, NULL); + r = vhost_get_avail_buf(vq, &vc->buf, + vq->iov, ARRAY_SIZE(vq->iov), &vc->out, &vc->in, + NULL, NULL); - pr_debug("vhost_get_vq_desc: head: %d, out: %u in: %u\n", - vc->head, vc->out, vc->in); + pr_debug("vhost_get_avail_buf: buf: %d, out: %u in: %u\n", + vc->buf.id, vc->out, vc->in); /* On error, stop handling until the next kick. */ - if (unlikely(vc->head < 0)) + if (unlikely(r < 0)) goto done; /* Nothing new? Wait for eventfd to tell us they refilled. */ - if (vc->head == vq->num) { + if (!r) { if (unlikely(vhost_enable_notify(&vs->dev, vq))) { vhost_disable_notify(&vs->dev, vq); ret = -EAGAIN; @@ -1093,11 +1108,11 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) } } /* - * Save the descriptor from vhost_get_vq_desc() to be used to + * Save the descriptor from vhost_get_avail_buf() to be used to * complete the virtio-scsi request in TCM callback context via * vhost_scsi_queue_data_in() and vhost_scsi_queue_status() */ - cmd->tvc_vq_desc = vc.head; + cmd->tvc_vq_desc = vc.buf; /* * Dispatch cmd descriptor for cmwq execution in process * context provided by vhost_scsi_workqueue. This also ensures @@ -1117,7 +1132,7 @@ vhost_scsi_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) if (ret == -ENXIO) break; else if (ret == -EIO) - vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); + vhost_scsi_send_bad_target(vs, vq, &vc.buf, vc.out); } while (likely(!vhost_exceeds_weight(vq, ++c, 0))); out: mutex_unlock(&vq->mutex); @@ -1139,9 +1154,9 @@ vhost_scsi_send_tmf_reject(struct vhost_scsi *vs, iov_iter_init(&iov_iter, READ, &vq->iov[vc->out], vc->in, sizeof(rsp)); ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); - if (likely(ret == sizeof(rsp))) - vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0); - else + if (likely(ret == sizeof(rsp))) { + vhost_scsi_signal_noinput(&vs->dev, vq, &vc->buf); + } else pr_err("Faulted on virtio_scsi_ctrl_tmf_resp\n"); } @@ -1162,7 +1177,7 @@ vhost_scsi_send_an_resp(struct vhost_scsi *vs, ret = copy_to_iter(&rsp, sizeof(rsp), &iov_iter); if (likely(ret == sizeof(rsp))) - vhost_add_used_and_signal(&vs->dev, vq, vc->head, 0); + vhost_scsi_signal_noinput(&vs->dev, vq, &vc->buf); else pr_err("Faulted on virtio_scsi_ctrl_an_resp\n"); } @@ -1269,7 +1284,7 @@ vhost_scsi_ctl_handle_vq(struct vhost_scsi *vs, struct vhost_virtqueue *vq) if (ret == -ENXIO) break; else if (ret == -EIO) - vhost_scsi_send_bad_target(vs, vq, vc.head, vc.out); + vhost_scsi_send_bad_target(vs, vq, &vc.buf, vc.out); } while (likely(!vhost_exceeds_weight(vq, ++c, 0))); out: mutex_unlock(&vq->mutex); From patchwork Mon Jun 8 12:53:13 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 11593301 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AF6A3739 for ; Mon, 8 Jun 2020 12:53:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8E5772076C for ; Mon, 8 Jun 2020 12:53:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="KFDAnuso" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729117AbgFHMxu (ORCPT ); Mon, 8 Jun 2020 08:53:50 -0400 Received: from us-smtp-2.mimecast.com ([205.139.110.61]:44767 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729735AbgFHMxa (ORCPT ); Mon, 8 Jun 2020 08:53:30 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591620808; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=TEosg1cbEhe9hhKHYKqZg2N/D89Ri/A+CQJLw8Cq4Bg=; b=KFDAnuso/ftTJvrswGRpM0qlY5W4HtzGEPrOgm4yKUy0y3+QeDur/jLx/c6QUjKqFAsYUC HIorg6HcR2RmrkAY0k6UlF1ny2mvMZYpQ6suwX6LfC9BlajH67Y5SzMB8v5UKpepMQ8lVo +k2QevCXXTc2XHTYiVGI2UHnvdxmQNs= Received: from mail-wm1-f71.google.com (mail-wm1-f71.google.com [209.85.128.71]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-386-PffVT3cxPDSNLIVLi3zkKA-1; Mon, 08 Jun 2020 08:53:17 -0400 X-MC-Unique: PffVT3cxPDSNLIVLi3zkKA-1 Received: by mail-wm1-f71.google.com with SMTP id v24so1736272wmh.3 for ; Mon, 08 Jun 2020 05:53:17 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=TEosg1cbEhe9hhKHYKqZg2N/D89Ri/A+CQJLw8Cq4Bg=; b=eN93f5FpwsCFyh6qyHArXiQD/R1JQ+6dl/H5uyL77mtdLbZi5zpVe5rGSvDlkUFvGL F3KkPGe1woiZazofXsnTdbGOlwDv/KEF6exIykRRgHAHh7yDBlRQIxkaUCCYZEfc/1jm iI1WB4ArA2n3+a40d5mlSMOYLh/GXnI5IP0oRijYCfpuAgaVncyhJVEZlGkwKN+anquE cRxr1fmJ18pW5vNPBFyHh4kCwWxkzV9rNPlu9El51KBRDAIP4D8ZqbQiroxuXYQGBjU+ lZ9hL/5OfkBZKJgj/uwgUi5x4w/QOGwbfYyw4dpw6QPP+RSyrUbAObDgcKIFSPhLD0Om 2Lyw== X-Gm-Message-State: AOAM532ZjF/mVT+d7GLVd595rPEytwIHm3+5ZZMqmKC8uklkswl5NGCA n7NuMgh+OMayBGcTUlknbnJZnJ1TN1yov18j2PVe5oBs9d+V1doAWYJvTIlC3xaIipav9NvfbWr 0tvs3JTlW4DCL X-Received: by 2002:adf:9d8e:: with SMTP id p14mr22776191wre.236.1591620795491; Mon, 08 Jun 2020 05:53:15 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzojN0Rni5a/KRQQtayEgafAMQjL2u7TFZEVEHmdO1lnxFxUgOcYrWuJF226hamluzbsGThDA== X-Received: by 2002:adf:9d8e:: with SMTP id p14mr22776176wre.236.1591620795249; Mon, 08 Jun 2020 05:53:15 -0700 (PDT) Received: from redhat.com (bzq-109-64-41-91.red.bezeqint.net. [109.64.41.91]) by smtp.gmail.com with ESMTPSA id i10sm22891380wrw.51.2020.06.08.05.53.13 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2020 05:53:14 -0700 (PDT) Date: Mon, 8 Jun 2020 08:53:13 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, Jason Wang , eperezma@redhat.com, Stefan Hajnoczi , Stefano Garzarella Subject: [PATCH RFC v6 10/11] vhost/vsock: switch to the buf API Message-ID: <20200608125238.728563-11-mst@redhat.com> References: <20200608125238.728563-1-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200608125238.728563-1-mst@redhat.com> X-Mailer: git-send-email 2.24.1.751.gd10ce2899c X-Mutt-Fcc: =sent Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org A straight-forward conversion. Signed-off-by: Michael S. Tsirkin Reviewed-by: Stefano Garzarella Tested-by: Stefano Garzarella --- drivers/vhost/vsock.c | 30 ++++++++++++++++++------------ 1 file changed, 18 insertions(+), 12 deletions(-) diff --git a/drivers/vhost/vsock.c b/drivers/vhost/vsock.c index a483cec31d5c..61c6d3dd2ae3 100644 --- a/drivers/vhost/vsock.c +++ b/drivers/vhost/vsock.c @@ -103,7 +103,8 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, unsigned out, in; size_t nbytes; size_t iov_len, payload_len; - int head; + struct vhost_buf buf; + int ret; spin_lock_bh(&vsock->send_pkt_list_lock); if (list_empty(&vsock->send_pkt_list)) { @@ -117,16 +118,17 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, list_del_init(&pkt->list); spin_unlock_bh(&vsock->send_pkt_list_lock); - head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), - &out, &in, NULL, NULL); - if (head < 0) { + ret = vhost_get_avail_buf(vq, &buf, + vq->iov, ARRAY_SIZE(vq->iov), + &out, &in, NULL, NULL); + if (ret < 0) { spin_lock_bh(&vsock->send_pkt_list_lock); list_add(&pkt->list, &vsock->send_pkt_list); spin_unlock_bh(&vsock->send_pkt_list_lock); break; } - if (head == vq->num) { + if (!ret) { spin_lock_bh(&vsock->send_pkt_list_lock); list_add(&pkt->list, &vsock->send_pkt_list); spin_unlock_bh(&vsock->send_pkt_list_lock); @@ -186,7 +188,8 @@ vhost_transport_do_send_pkt(struct vhost_vsock *vsock, */ virtio_transport_deliver_tap_pkt(pkt); - vhost_add_used(vq, head, sizeof(pkt->hdr) + payload_len); + buf.in_len = sizeof(pkt->hdr) + payload_len; + vhost_put_used_buf(vq, &buf); added = true; pkt->off += payload_len; @@ -440,7 +443,8 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work) struct vhost_vsock *vsock = container_of(vq->dev, struct vhost_vsock, dev); struct virtio_vsock_pkt *pkt; - int head, pkts = 0, total_len = 0; + int ret, pkts = 0, total_len = 0; + struct vhost_buf buf; unsigned int out, in; bool added = false; @@ -461,12 +465,13 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work) goto no_more_replies; } - head = vhost_get_vq_desc(vq, vq->iov, ARRAY_SIZE(vq->iov), - &out, &in, NULL, NULL); - if (head < 0) + ret = vhost_get_avail_buf(vq, &buf, + vq->iov, ARRAY_SIZE(vq->iov), + &out, &in, NULL, NULL); + if (ret < 0) break; - if (head == vq->num) { + if (!ret) { if (unlikely(vhost_enable_notify(&vsock->dev, vq))) { vhost_disable_notify(&vsock->dev, vq); continue; @@ -494,7 +499,8 @@ static void vhost_vsock_handle_tx_kick(struct vhost_work *work) virtio_transport_free_pkt(pkt); len += sizeof(pkt->hdr); - vhost_add_used(vq, head, len); + buf.in_len = len; + vhost_put_used_buf(vq, &buf); total_len += len; added = true; } while(likely(!vhost_exceeds_weight(vq, ++pkts, total_len))); From patchwork Mon Jun 8 12:53:15 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Michael S. Tsirkin" X-Patchwork-Id: 11593303 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id CB8BA739 for ; Mon, 8 Jun 2020 12:53:54 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A989D2076A for ; Mon, 8 Jun 2020 12:53:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="h0+r8Oet" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728988AbgFHMxw (ORCPT ); Mon, 8 Jun 2020 08:53:52 -0400 Received: from us-smtp-delivery-1.mimecast.com ([205.139.110.120]:44659 "EHLO us-smtp-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1729718AbgFHMxX (ORCPT ); Mon, 8 Jun 2020 08:53:23 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1591620801; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=53ZvoqSQRb7zo4P/bKE7PS6beB3wyT4RaZMP+gyjZts=; b=h0+r8OetIjfbIXT8aFKzPzfctnQCXQvUQdfzZw9zHQiQ+ZcfXqm4kkEUbrZpTDtHmw12yZ NE8NUe7V3qT1uQvp8Lf9lfNEu+YUwPjI9hPUbeDkHK0TlJ2nXL03rYBkpfGAHvx80PN8Wo 60dmno7dFsQYPcQWgZ09aszBiGg9eWk= Received: from mail-wm1-f70.google.com (mail-wm1-f70.google.com [209.85.128.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-426-yzQdKtRjNom612C4zi7Pvg-1; Mon, 08 Jun 2020 08:53:19 -0400 X-MC-Unique: yzQdKtRjNom612C4zi7Pvg-1 Received: by mail-wm1-f70.google.com with SMTP id j128so5206824wmj.6 for ; Mon, 08 Jun 2020 05:53:18 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=53ZvoqSQRb7zo4P/bKE7PS6beB3wyT4RaZMP+gyjZts=; b=LeaJt4/E8WfIzz5UGT6zGXeyyXfzmZ0td91N/vL3pL3Kang+rd04PRlXIT0i+RzD2T 7Lajfu0I2/ZbqnRVuYmoAa5YCmKa2FwoDBmgUWorF6RfzzHI+1Mi/0ePszIzrGSfuXBu uPBciEoP8UPEWwu8isXNQ2ws8+NCESHYAUuVUQMU3tOAcpCwfzrcf8uR/K1+JHn7TPQ/ mLpzvggBk6PI12Y48zfIP3JXhpnrUZY+pcM4NDY88NAvsD4AkNWPXk0JaOzmgMm89O4z nTTteUn7+Yf9lYombk+GxeJZU2HtmZ1U2Z+k4OviO8U08QL9QLjOhP0FiuGN81z1o32D e1Rw== X-Gm-Message-State: AOAM533nT9Ya1zQ+zXoN9qMYIHJxYgvVIILRRniqd6j9TvHLwURA8hCJ xi10tvvAuFAujgM/CuxmCBq0b1p82cCjC+V5AcWnhPabRYjD1sUjnTwKkB7ljpt9r8eS7gNTTcD zrbnhOSNh08V6 X-Received: by 2002:adf:a18b:: with SMTP id u11mr23319161wru.102.1591620797778; Mon, 08 Jun 2020 05:53:17 -0700 (PDT) X-Google-Smtp-Source: ABdhPJwqxu8B0D+dmfKRmG6m0k8N+mfH4DtG2okPcTFiiTciSa1DwJ+py71/ReHBdaFke8bA3qVg4w== X-Received: by 2002:adf:a18b:: with SMTP id u11mr23319147wru.102.1591620797545; Mon, 08 Jun 2020 05:53:17 -0700 (PDT) Received: from redhat.com (bzq-109-64-41-91.red.bezeqint.net. [109.64.41.91]) by smtp.gmail.com with ESMTPSA id c16sm8782123wml.45.2020.06.08.05.53.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 08 Jun 2020 05:53:17 -0700 (PDT) Date: Mon, 8 Jun 2020 08:53:15 -0400 From: "Michael S. Tsirkin" To: linux-kernel@vger.kernel.org Cc: kvm@vger.kernel.org, virtualization@lists.linux-foundation.org, netdev@vger.kernel.org, Jason Wang , eperezma@redhat.com Subject: [PATCH RFC v6 11/11] vhost: drop head based APIs Message-ID: <20200608125238.728563-12-mst@redhat.com> References: <20200608125238.728563-1-mst@redhat.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <20200608125238.728563-1-mst@redhat.com> X-Mailer: git-send-email 2.24.1.751.gd10ce2899c X-Mutt-Fcc: =sent Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Everyone's using buf APIs, no need for head based ones anymore. Signed-off-by: Michael S. Tsirkin --- drivers/vhost/vhost.c | 43 ++++++++----------------------------------- drivers/vhost/vhost.h | 12 ------------ 2 files changed, 8 insertions(+), 47 deletions(-) diff --git a/drivers/vhost/vhost.c b/drivers/vhost/vhost.c index f4a6ff9ef77a..7bd4bc581fc9 100644 --- a/drivers/vhost/vhost.c +++ b/drivers/vhost/vhost.c @@ -2429,18 +2429,11 @@ EXPORT_SYMBOL_GPL(vhost_get_avail_buf); void vhost_discard_avail_bufs(struct vhost_virtqueue *vq, struct vhost_buf *buf, unsigned count) { - vhost_discard_vq_desc(vq, count); + unfetch_descs(vq); + vq->last_avail_idx -= count; } EXPORT_SYMBOL_GPL(vhost_discard_avail_bufs); -/* Reverse the effect of vhost_get_vq_desc. Useful for error handling. */ -void vhost_discard_vq_desc(struct vhost_virtqueue *vq, int n) -{ - unfetch_descs(vq); - vq->last_avail_idx -= n; -} -EXPORT_SYMBOL_GPL(vhost_discard_vq_desc); - static int __vhost_add_used_n(struct vhost_virtqueue *vq, struct vring_used_elem *heads, unsigned count) @@ -2473,8 +2466,7 @@ static int __vhost_add_used_n(struct vhost_virtqueue *vq, return 0; } -/* After we've used one of their buffers, we tell them about it. We'll then - * want to notify the guest, using eventfd. */ +static int vhost_add_used_n(struct vhost_virtqueue *vq, struct vring_used_elem *heads, unsigned count) { @@ -2508,10 +2500,8 @@ int vhost_add_used_n(struct vhost_virtqueue *vq, struct vring_used_elem *heads, } return r; } -EXPORT_SYMBOL_GPL(vhost_add_used_n); -/* After we've used one of their buffers, we tell them about it. We'll then - * want to notify the guest, using eventfd. */ +static int vhost_add_used(struct vhost_virtqueue *vq, unsigned int head, int len) { struct vring_used_elem heads = { @@ -2521,14 +2511,17 @@ int vhost_add_used(struct vhost_virtqueue *vq, unsigned int head, int len) return vhost_add_used_n(vq, &heads, 1); } -EXPORT_SYMBOL_GPL(vhost_add_used); +/* After we've used one of their buffers, we tell them about it. We'll then + * want to notify the guest, using vhost_signal. */ int vhost_put_used_buf(struct vhost_virtqueue *vq, struct vhost_buf *buf) { return vhost_add_used(vq, buf->id, buf->in_len); } EXPORT_SYMBOL_GPL(vhost_put_used_buf); +/* After we've used one of their buffers, we tell them about it. We'll then + * want to notify the guest, using vhost_signal. */ int vhost_put_used_n_bufs(struct vhost_virtqueue *vq, struct vhost_buf *bufs, unsigned count) { @@ -2589,26 +2582,6 @@ void vhost_signal(struct vhost_dev *dev, struct vhost_virtqueue *vq) } EXPORT_SYMBOL_GPL(vhost_signal); -/* And here's the combo meal deal. Supersize me! */ -void vhost_add_used_and_signal(struct vhost_dev *dev, - struct vhost_virtqueue *vq, - unsigned int head, int len) -{ - vhost_add_used(vq, head, len); - vhost_signal(dev, vq); -} -EXPORT_SYMBOL_GPL(vhost_add_used_and_signal); - -/* multi-buffer version of vhost_add_used_and_signal */ -void vhost_add_used_and_signal_n(struct vhost_dev *dev, - struct vhost_virtqueue *vq, - struct vring_used_elem *heads, unsigned count) -{ - vhost_add_used_n(vq, heads, count); - vhost_signal(dev, vq); -} -EXPORT_SYMBOL_GPL(vhost_add_used_and_signal_n); - /* return true if we're sure that avaiable ring is empty */ bool vhost_vq_avail_empty(struct vhost_dev *dev, struct vhost_virtqueue *vq) { diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h index 28eea0155efb..264a2a2fae97 100644 --- a/drivers/vhost/vhost.h +++ b/drivers/vhost/vhost.h @@ -197,11 +197,6 @@ long vhost_vring_ioctl(struct vhost_dev *d, unsigned int ioctl, void __user *arg bool vhost_vq_access_ok(struct vhost_virtqueue *vq); bool vhost_log_access_ok(struct vhost_dev *); -int vhost_get_vq_desc(struct vhost_virtqueue *, - struct iovec iov[], unsigned int iov_count, - unsigned int *out_num, unsigned int *in_num, - struct vhost_log *log, unsigned int *log_num); -void vhost_discard_vq_desc(struct vhost_virtqueue *, int n); int vhost_get_avail_buf(struct vhost_virtqueue *, struct vhost_buf *buf, struct iovec iov[], unsigned int iov_count, unsigned int *out_num, unsigned int *in_num, @@ -209,13 +204,6 @@ int vhost_get_avail_buf(struct vhost_virtqueue *, struct vhost_buf *buf, void vhost_discard_avail_bufs(struct vhost_virtqueue *, struct vhost_buf *, unsigned count); int vhost_vq_init_access(struct vhost_virtqueue *); -int vhost_add_used(struct vhost_virtqueue *, unsigned int head, int len); -int vhost_add_used_n(struct vhost_virtqueue *, struct vring_used_elem *heads, - unsigned count); -void vhost_add_used_and_signal(struct vhost_dev *, struct vhost_virtqueue *, - unsigned int id, int len); -void vhost_add_used_and_signal_n(struct vhost_dev *, struct vhost_virtqueue *, - struct vring_used_elem *heads, unsigned count); int vhost_put_used_buf(struct vhost_virtqueue *, struct vhost_buf *buf); int vhost_put_used_n_bufs(struct vhost_virtqueue *, struct vhost_buf *bufs, unsigned count);