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bh=+Xaupiy6G5AxHZn4ASBKHIhMrK2GozhLJEYL8jK1h6U=; b=OYRT0ylU4R7OF2SKodceaw33juWxwJUwgl7lMdwXjiejssUu3KY+C6hCgbpdUiqiXE+aCV6S66aRmShvdzYIeDmAiV8UhUhSEtorcLBK1VKCcotMlhbVg8AMR270P9Xc94IcCOB7buAwuslmtQZbfOR8WlovpZEG/MORSbanGyfRtL+PBU+44r9x3MHBE3c5rfkUlEiEdpPGW1b+D0Vy2/g1CwfMUGck47N4dDXm/2XFeQvtcQfLwS0CF8xXjVnfFMghFy7P+D97kYWR8RZviBy5s7VoZMc35m0t1k12mMO3Yyt8ZU3Xfvrc+LJyVfQk+qerI/t48lFhdcZ3xB+EtQ== 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 v4] hw/virtio: Fix packed virtqueue flush used_idx Date: Sun, 7 Apr 2024 09:54:51 +0800 Message-Id: <20240407015451.5228-2-wafer@jaguarmicro.com> X-Mailer: git-send-email 2.27.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: SI2PR02CA0027.apcprd02.prod.outlook.com (2603:1096:4:195::14) To PUZPR06MB4713.apcprd06.prod.outlook.com (2603:1096:301:b4::10) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: PUZPR06MB4713:EE_|TYUPR06MB5876: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=40.107.117.93; envelope-from=wafer@jaguarmicro.com; helo=APC01-TYZ-obe.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, RCVD_IN_MSPIKE_H2=-0.001, 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: 1712455313803100003 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") Acked-by: Eugenio P=C3=A9rez Signed-off-by: Wafer --- Changes in v4: - Add Acked-by. 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