From patchwork Thu Dec 12 16:37:42 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: "Dr. David Alan Gilbert" X-Patchwork-Id: 11288689 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 6814F138D for ; Thu, 12 Dec 2019 17:11:01 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 3EF76205C9 for ; Thu, 12 Dec 2019 17:11:01 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="VeYBXD1D" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 3EF76205C9 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:34474 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ifRzP-0006n2-PS for patchwork-qemu-devel@patchwork.kernel.org; Thu, 12 Dec 2019 12:10:59 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:46141) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1ifRVH-0005Lo-QX for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:39:53 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ifRVF-0001Xv-U7 for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:39:51 -0500 Received: from us-smtp-1.mimecast.com ([207.211.31.81]:56879 helo=us-smtp-delivery-1.mimecast.com) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ifRVF-0001Wk-LB for qemu-devel@nongnu.org; Thu, 12 Dec 2019 11:39:49 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1576168788; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=cegFOOI3OpXmd9mT4dvOlXRppgMeQV1+8kVVHTninB4=; b=VeYBXD1DWzCpA7Y/y2EeSvwMaDrfNv6f+QeB5lnn16Dn3PZgHLjWMav667tB5qtSI13qBI kBmyAlIILwEvK3rZmRMqrq6ppljcweiFaM/a8iqigpZbqDvkOrvCxhw50BgkBu1k4JG4eI 0J2emmFORdaItyTh2EsaisQX1+kmkrc= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-173-wz4Y-PuJNt2uzQ3rfNOduw-1; Thu, 12 Dec 2019 11:39:46 -0500 Received: from smtp.corp.redhat.com (int-mx02.intmail.prod.int.phx2.redhat.com [10.5.11.12]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 0EC5E1800D45 for ; Thu, 12 Dec 2019 16:39:45 +0000 (UTC) Received: from dgilbert-t580.localhost (ovpn-116-226.ams2.redhat.com [10.36.116.226]) by smtp.corp.redhat.com (Postfix) with ESMTP id 37CF760BE1; Thu, 12 Dec 2019 16:39:44 +0000 (UTC) From: "Dr. David Alan Gilbert (git)" To: qemu-devel@nongnu.org, stefanha@redhat.com, vgoyal@redhat.com Subject: [PATCH 022/104] virtiofsd: Start reading commands from queue Date: Thu, 12 Dec 2019 16:37:42 +0000 Message-Id: <20191212163904.159893-23-dgilbert@redhat.com> In-Reply-To: <20191212163904.159893-1-dgilbert@redhat.com> References: <20191212163904.159893-1-dgilbert@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.12 X-MC-Unique: wz4Y-PuJNt2uzQ3rfNOduw-1 X-Mimecast-Spam-Score: 0 X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.81 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" From: "Dr. David Alan Gilbert" Pop queue elements off queues, copy the data from them and pass that to fuse. Note: 'out' in a VuVirtqElement is from QEMU 'in' in libfuse is into the daemon So we read from the out iov's to get a fuse_in_header When we get a kick we've got to read all the elements until the queue is empty. Signed-off-by: Dr. David Alan Gilbert Reviewed-by: Daniel P. Berrangé --- tools/virtiofsd/fuse_i.h | 2 + tools/virtiofsd/fuse_virtio.c | 100 +++++++++++++++++++++++++++++++++- 2 files changed, 99 insertions(+), 3 deletions(-) diff --git a/tools/virtiofsd/fuse_i.h b/tools/virtiofsd/fuse_i.h index 76cc968a6e..3d9a39cc1a 100644 --- a/tools/virtiofsd/fuse_i.h +++ b/tools/virtiofsd/fuse_i.h @@ -14,6 +14,7 @@ #include "fuse_lowlevel.h" struct fv_VuDev; +struct fv_QueueInfo; struct fuse_req { struct fuse_session *se; @@ -75,6 +76,7 @@ struct fuse_chan { pthread_mutex_t lock; int ctr; int fd; + struct fv_QueueInfo *qi; }; /** diff --git a/tools/virtiofsd/fuse_virtio.c b/tools/virtiofsd/fuse_virtio.c index 7118def1eb..99cced6888 100644 --- a/tools/virtiofsd/fuse_virtio.c +++ b/tools/virtiofsd/fuse_virtio.c @@ -12,6 +12,7 @@ */ #include "qemu/osdep.h" +#include "qemu/iov.h" #include "fuse_virtio.h" #include "fuse_i.h" #include "standard-headers/linux/fuse.h" @@ -32,6 +33,7 @@ #include "contrib/libvhost-user/libvhost-user.h" +struct fv_VuDev; struct fv_QueueInfo { pthread_t thread; struct fv_VuDev *virtio_dev; @@ -101,10 +103,42 @@ static void fv_panic(VuDev *dev, const char *err) exit(EXIT_FAILURE); } +/* + * Copy from an iovec into a fuse_buf (memory only) + * Caller must ensure there is space + */ +static void copy_from_iov(struct fuse_buf *buf, size_t out_num, + const struct iovec *out_sg) +{ + void *dest = buf->mem; + + while (out_num) { + size_t onelen = out_sg->iov_len; + memcpy(dest, out_sg->iov_base, onelen); + dest += onelen; + out_sg++; + out_num--; + } +} + /* Thread function for individual queues, created when a queue is 'started' */ static void *fv_queue_thread(void *opaque) { struct fv_QueueInfo *qi = opaque; + struct VuDev *dev = &qi->virtio_dev->dev; + struct VuVirtq *q = vu_get_queue(dev, qi->qidx); + struct fuse_session *se = qi->virtio_dev->se; + struct fuse_chan ch; + struct fuse_buf fbuf; + + fbuf.mem = NULL; + fbuf.flags = 0; + + fuse_mutex_init(&ch.lock); + ch.fd = (int)0xdaff0d111; + ch.ctr = 1; + ch.qi = qi; + fuse_log(FUSE_LOG_INFO, "%s: Start for queue %d kick_fd %d\n", __func__, qi->qidx, qi->kick_fd); while (1) { @@ -141,11 +175,71 @@ static void *fv_queue_thread(void *opaque) fuse_log(FUSE_LOG_ERR, "Eventfd_read for queue: %m\n"); break; } - if (qi->virtio_dev->se->debug) { - fprintf(stderr, "%s: Queue %d gave evalue: %zx\n", __func__, - qi->qidx, (size_t)evalue); + /* out is from guest, in is too guest */ + unsigned int in_bytes, out_bytes; + vu_queue_get_avail_bytes(dev, q, &in_bytes, &out_bytes, ~0, ~0); + + fuse_log(FUSE_LOG_DEBUG, + "%s: Queue %d gave evalue: %zx available: in: %u out: %u\n", + __func__, qi->qidx, (size_t)evalue, in_bytes, out_bytes); + + while (1) { + /* + * An element contains one request and the space to send our + * response They're spread over multiple descriptors in a + * scatter/gather set and we can't trust the guest to keep them + * still; so copy in/out. + */ + VuVirtqElement *elem = vu_queue_pop(dev, q, sizeof(VuVirtqElement)); + if (!elem) { + break; + } + + if (!fbuf.mem) { + fbuf.mem = malloc(se->bufsize); + assert(fbuf.mem); + assert(se->bufsize > sizeof(struct fuse_in_header)); + } + /* The 'out' part of the elem is from qemu */ + unsigned int out_num = elem->out_num; + struct iovec *out_sg = elem->out_sg; + size_t out_len = iov_size(out_sg, out_num); + fuse_log(FUSE_LOG_DEBUG, + "%s: elem %d: with %d out desc of length %zd\n", __func__, + elem->index, out_num, out_len); + + /* + * The elem should contain a 'fuse_in_header' (in to fuse) + * plus the data based on the len in the header. + */ + if (out_len < sizeof(struct fuse_in_header)) { + fuse_log(FUSE_LOG_ERR, "%s: elem %d too short for in_header\n", + __func__, elem->index); + assert(0); /* TODO */ + } + if (out_len > se->bufsize) { + fuse_log(FUSE_LOG_ERR, "%s: elem %d too large for buffer\n", + __func__, elem->index); + assert(0); /* TODO */ + } + copy_from_iov(&fbuf, out_num, out_sg); + fbuf.size = out_len; + + /* TODO! Endianness of header */ + + /* TODO: Fixup fuse_send_msg */ + /* TODO: Add checks for fuse_session_exited */ + fuse_session_process_buf_int(se, &fbuf, &ch); + + /* TODO: vu_queue_push(dev, q, elem, qi->write_count); */ + vu_queue_notify(dev, q); + + free(elem); + elem = NULL; } } + pthread_mutex_destroy(&ch.lock); + free(fbuf.mem); return NULL; }