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Mon, 24 Jun 2024 01:19:12 -0700 (PDT) From: thomas To: qemu-devel@nongnu.org Cc: mst@redhat.com, jasowang@redhat.com, qemu-stable@nongnu.org, thomas Subject: [PATCH v3] vritio-net: Notify the guest with the latest available idx Date: Mon, 24 Jun 2024 16:19:01 +0800 Message-Id: <20240624081901.38956-1-east.moutain.yang@gmail.com> X-Mailer: git-send-email 2.39.0 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::435; envelope-from=east.moutain.yang@gmail.com; helo=mail-pf1-x435.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1719217199689100003 Content-Type: text/plain; charset="utf-8" Patch 06b12970174 ("virtio-net: fix network stall under load") added double-check to test whether the available buffer size can satisfy the request or not, in case the guest has added some buffers to the avail ring simultaneously after the first check. It will be lucky if the available buffer size becomes okay after the double-check, then the host can send the packet to the guest. If the buffer size still can't satisfy the request, even if the guest has added some buffers, notify the guest with the latest available idx seen by the host, similiar to the action taken by the host after the first check. Fixes: 06b12970174 ("virtio-net: fix network stall under load") Signed-off-by: wencheng Yang --- hw/net/virtio-net.c | 1 + 1 file changed, 1 insertion(+) diff --git a/hw/net/virtio-net.c b/hw/net/virtio-net.c index 9c7e85caea..23c6c8c898 100644 --- a/hw/net/virtio-net.c +++ b/hw/net/virtio-net.c @@ -1654,6 +1654,7 @@ static int virtio_net_has_buffers(VirtIONetQueue *q, = int bufsize) if (virtio_queue_empty(q->rx_vq) || (n->mergeable_rx_bufs && !virtqueue_avail_bytes(q->rx_vq, bufsize, 0))) { + virtio_queue_set_notification(q->rx_vq, 1); return 0; } } --=20 2.39.0