From patchwork Tue Mar 31 18:00:06 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Eugenio Perez Martin X-Patchwork-Id: 11468181 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 8B6D192A for ; Tue, 31 Mar 2020 18:00:49 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6A003214DB for ; Tue, 31 Mar 2020 18:00:49 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="EQCTmJhT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728533AbgCaSAs (ORCPT ); Tue, 31 Mar 2020 14:00:48 -0400 Received: from us-smtp-1.mimecast.com ([205.139.110.61]:27765 "EHLO us-smtp-delivery-1.mimecast.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1728428AbgCaSAr (ORCPT ); Tue, 31 Mar 2020 14:00:47 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1585677646; 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=odSNU5geOmU9YHlF/mn+CwIcX9ISms2I2rT8aoALY2I=; b=EQCTmJhTNo5+Ax5Rd+/iyqL1kfzvUGn0pcQGPlYh5u6hn/MSvuNgbRUM/oQ+jOHmvKNaMU QllToKJnCAPHpjLskNa1dP2Cz4Vj2j+OCL7RK7SWq6vkobv7C8iXfWyVWex+fOMSbYMFQt QZDIsK8PqZBnjBq3UZ0+wSNBNUo5Luo= 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-96-YQNTMUPvOGCNG-JZlwdHoA-1; Tue, 31 Mar 2020 14:00:41 -0400 X-MC-Unique: YQNTMUPvOGCNG-JZlwdHoA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5CCEB8017CC; Tue, 31 Mar 2020 18:00:40 +0000 (UTC) Received: from eperezma.remote.csb (ovpn-112-92.ams2.redhat.com [10.36.112.92]) by smtp.corp.redhat.com (Postfix) with ESMTP id 0EB395C1A2; Tue, 31 Mar 2020 18:00:37 +0000 (UTC) From: =?utf-8?q?Eugenio_P=C3=A9rez?= To: "Michael S. Tsirkin" Cc: "linux-kernel@vger.kernel.org" , =?utf-8?q?Eugenio_P=C3=A9rez?= , kvm list , Halil Pasic , "virtualization@lists.linux-foundation.org" , Linux Next Mailing List , Cornelia Huck , Stephen Rothwell , Christian Borntraeger Subject: [PATCH v2 8/8] tools/virtio: Make --reset reset ring idx Date: Tue, 31 Mar 2020 20:00:06 +0200 Message-Id: <20200331180006.25829-9-eperezma@redhat.com> In-Reply-To: <20200331180006.25829-1-eperezma@redhat.com> References: <20200331180006.25829-1-eperezma@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org Signed-off-by: Eugenio Pérez --- drivers/virtio/virtio_ring.c | 29 +++++++++++++++++++++++++++++ tools/virtio/linux/virtio.h | 2 ++ tools/virtio/virtio_test.c | 28 +++++++++++++++++++++++++++- 3 files changed, 58 insertions(+), 1 deletion(-) diff --git a/drivers/virtio/virtio_ring.c b/drivers/virtio/virtio_ring.c index 867c7ebd3f10..01b322ee2e04 100644 --- a/drivers/virtio/virtio_ring.c +++ b/drivers/virtio/virtio_ring.c @@ -1810,6 +1810,35 @@ int virtqueue_add_inbuf_ctx(struct virtqueue *vq, } EXPORT_SYMBOL_GPL(virtqueue_add_inbuf_ctx); +#ifndef __KERNEL__ + +/** + * virtqueue_reset_free_head - Reset to 0 the members of split ring. + * @vq: Virtqueue to reset. + * + * At this moment, is only meant for debug the ring index change, do not use + * in production. + */ +void virtqueue_reset_free_head(struct virtqueue *_vq) +{ + struct vring_virtqueue *vq = to_vvq(_vq); + + // vq->last_used_idx = 0; + vq->num_added = 0; + + vq->split.queue_size_in_bytes = 0; + vq->split.avail_flags_shadow = 0; + vq->split.avail_idx_shadow = 0; + + memset(vq->split.desc_state, 0, vq->split.vring.num * + sizeof(struct vring_desc_state_split)); + + vq->free_head = 0; +} +EXPORT_SYMBOL_GPL(virtqueue_reset_free_head); + +#endif + /** * virtqueue_kick_prepare - first half of split virtqueue_kick call. * @_vq: the struct virtqueue diff --git a/tools/virtio/linux/virtio.h b/tools/virtio/linux/virtio.h index b751350d4ce8..5d33eab6b814 100644 --- a/tools/virtio/linux/virtio.h +++ b/tools/virtio/linux/virtio.h @@ -65,4 +65,6 @@ struct virtqueue *vring_new_virtqueue(unsigned int index, const char *name); void vring_del_virtqueue(struct virtqueue *vq); +void virtqueue_reset_free_head(struct virtqueue *vq); + #endif diff --git a/tools/virtio/virtio_test.c b/tools/virtio/virtio_test.c index 93d81cd64ba0..bf21ece30594 100644 --- a/tools/virtio/virtio_test.c +++ b/tools/virtio/virtio_test.c @@ -49,6 +49,7 @@ struct vdev_info { static const struct vhost_vring_file no_backend = { .fd = -1 }, backend = { .fd = 1 }; +static const struct vhost_vring_state null_state = {}; bool vq_notify(struct virtqueue *vq) { @@ -218,10 +219,33 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq, } if (reset) { + struct vhost_vring_state s = { .index = 0 }; + int i; + vq->vring.avail->idx = 0; + vq->vq->num_free = vq->vring.num; + + // Put everything in free lists. + for (i = 0; i < vq->vring.num-1; i++) + vq->vring.desc[i].next = + cpu_to_virtio16(&dev->vdev, + i + 1); + vq->vring.desc[vq->vring.num-1].next = 0; + virtqueue_reset_free_head(vq->vq); + + r = ioctl(dev->control, VHOST_GET_VRING_BASE, + &s); + assert(!r); + + s.num = 0; + r = ioctl(dev->control, VHOST_SET_VRING_BASE, + &null_state); + assert(!r); + r = ioctl(dev->control, VHOST_TEST_SET_BACKEND, &backend); assert(!r); + started = completed; while (completed > next_reset) next_reset += completed; } @@ -243,7 +267,9 @@ static void run_test(struct vdev_info *dev, struct vq_info *vq, test = 0; r = ioctl(dev->control, VHOST_TEST_RUN, &test); assert(r >= 0); - fprintf(stderr, "spurious wakeups: 0x%llx\n", spurious); + fprintf(stderr, + "spurious wakeups: 0x%llx started=0x%lx completed=0x%lx\n", + spurious, started, completed); } const char optstring[] = "h";