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bh=LLpu1HEQUusPupyDoAJ7vNOc3peRxHNF57tI4ntavvM=; b=SReuEGXKFOEjoDTslCk/Di7m3jhj0O8LhclqgSc1JOmwjHa9ylc1RJyScwq36WhcE1EFLcqukPy5AfvlGqHxGwKlraeVJXAXzH065vabs42zYBnAUVbNpowofRmo4/WnhmCIoSapnWXyQTXfFYmetg2OChP0T5gB8U+F6NE4DQea8csc47nlB753WCtbEIAUZMyGTKCkaXf4gWZ6eqgP0os9hqRwFyyyFy4lDTz8BldTcBdiXNqmjg48okG1nSE+X6VnvzwOgbXFqeJRu8qmdE79H9tkYpDjYSkn8K99r/xBBVqiDav75WanQdmKHcQP45MeKJ5v0AtLmCpSdUNJ1g== From: Wafer To: eperezma@redhat.com, mst@redhat.com, jasowang@redhat.com Cc: qemu-devel@nongnu.org, jonah.palmer@oracle.com, leiyang@redhat.com, angus.chen@jaguarmicro.com, Wafer Subject: [PATCH v3] hw/virtio: Fix packed virtqueue flush used_idx Date: Fri, 5 Apr 2024 21:19:45 +0800 Message-Id: <20240405131945.6091-2-wafer@jaguarmicro.com> X-Mailer: git-send-email 2.27.0 Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SG2PR01CA0187.apcprd01.prod.exchangelabs.com (2603:1096:4:189::12) To PUZPR06MB4713.apcprd06.prod.outlook.com (2603:1096:301:b4::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PUZPR06MB4713:EE_|SEYPR06MB6930:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2a01:111:f403:c400::3; envelope-from=wafer@jaguarmicro.com; helo=HK3PR03CU002.outbound.protection.outlook.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, SPF_HELO_PASS=-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 @jaguarmicro.com) X-ZM-MESSAGEID: 1712323243317100001 Content-Type: text/plain; charset="utf-8" If a virtio-net device has the VIRTIO_NET_F_MRG_RXBUF feature but not the VIRTIO_RING_F_INDIRECT_DESC feature, 'VirtIONetQueue->rx_vq' will use the merge feature to store data in multiple 'elems'. The 'num_buffers' in the virtio header indicates how many elements are merg= ed. If the value of 'num_buffers' is greater than 1, all the merged elements will be filled into the descriptor ring. The 'idx' of the elements should be the value of 'vq->used_idx' plus 'ndesc= s'. Fixes: 86044b24e8 ("virtio: basic packed virtqueue support") Signed-off-by: Wafer Acked-by: Eugenio P=C3=A9rez --- Changes in v3: - Add the commit-ID of the introduced problem in commit message; Changes in v2: - Clarify more in commit message; --- hw/virtio/virtio.c | 12 ++++++++++-- 1 file changed, 10 insertions(+), 2 deletions(-) diff --git a/hw/virtio/virtio.c b/hw/virtio/virtio.c index fb6b4ccd83..cab5832cac 100644 --- a/hw/virtio/virtio.c +++ b/hw/virtio/virtio.c @@ -957,12 +957,20 @@ static void virtqueue_packed_flush(VirtQueue *vq, uns= igned int count) return; } =20 + /* + * For indirect element's 'ndescs' is 1. + * For all other elemment's 'ndescs' is the + * number of descriptors chained by NEXT (as set in virtqueue_packed_p= op). + * So When the 'elem' be filled into the descriptor ring, + * The 'idx' of this 'elem' shall be + * the value of 'vq->used_idx' plus the 'ndescs'. + */ + ndescs +=3D vq->used_elems[0].ndescs; for (i =3D 1; i < count; i++) { - virtqueue_packed_fill_desc(vq, &vq->used_elems[i], i, false); + virtqueue_packed_fill_desc(vq, &vq->used_elems[i], ndescs, false); ndescs +=3D vq->used_elems[i].ndescs; } virtqueue_packed_fill_desc(vq, &vq->used_elems[0], 0, true); - ndescs +=3D vq->used_elems[0].ndescs; =20 vq->inuse -=3D ndescs; vq->used_idx +=3D ndescs; --=20 2.27.0