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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SN6PR11MB3504.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 36fb95a9-a323-4d79-33e9-08da5b4a0299 X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Jul 2022 10:11:05.5336 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: SvsRqqmEKlH39C0NTvfkasb65P4OvNlkI+cQt7rKRJ60YdUObrbM74SEEXosmMmyrO6NXag9tFRsWCnN7kQflg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: MW5PR11MB5764 X-OriginatorOrg: intel.com X-BeenThere: stable@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: patches for DPDK stable branches List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: stable-bounces@dpdk.org > -----Original Message----- > From: Wang, YuanX > Sent: Friday, June 17, 2022 10:42 AM > To: maxime.coquelin@redhat.com; Xia, Chenbo ; > dev@dpdk.org > Cc: Hu, Jiayu ; He, Xingguang ; > Wang, YuanX ; stable@dpdk.org > Subject: [PATCH] net/virtio: fix socket nonblocking mode affects > initialization >=20 > The virtio-user initialization requires unix socket to receive backend > messages in block mode. However, vhost_user_update_link_state() sets > the same socket to nonblocking via fcntl, which affects all threads. > Enabling the rxq interrupt can causes both of these behaviors to occur > concurrently, with the result that the initialization may fail > because no messages are received in nonblocking socket. >=20 > Thread 1: > virtio_init_device() > --> virtio_user_start_device() > --> vhost_user_set_memory_table() > --> vhost_user_check_reply_ack() >=20 > Thread 2: > virtio_interrupt_handler() > --> vhost_user_update_link_state() >=20 > Fix that by replacing O_NONBLOCK with the recv per-call option > MSG_DONTWAIT. >=20 > Fixes: ef53b6030039 ("net/virtio-user: support LSC") > Cc: stable@dpdk.org >=20 > Signed-off-by: Yuan Wang > --- > drivers/net/virtio/virtio_user/vhost_user.c | 15 +-------------- > 1 file changed, 1 insertion(+), 14 deletions(-) >=20 > diff --git a/drivers/net/virtio/virtio_user/vhost_user.c > b/drivers/net/virtio/virtio_user/vhost_user.c > index 7d1749114d..198bd63d3c 100644 > --- a/drivers/net/virtio/virtio_user/vhost_user.c > +++ b/drivers/net/virtio/virtio_user/vhost_user.c > @@ -940,15 +940,8 @@ vhost_user_update_link_state(struct virtio_user_dev > *dev) >=20 > if (data->vhostfd >=3D 0) { > int r; > - int flags; >=20 > - flags =3D fcntl(data->vhostfd, F_GETFL); > - if (fcntl(data->vhostfd, F_SETFL, flags | O_NONBLOCK) =3D=3D -1) { > - PMD_DRV_LOG(ERR, "error setting O_NONBLOCK flag"); > - return -1; > - } > - > - r =3D recv(data->vhostfd, buf, 128, MSG_PEEK); > + r =3D recv(data->vhostfd, buf, 128, MSG_PEEK | MSG_DONTWAIT); > if (r =3D=3D 0 || (r < 0 && errno !=3D EAGAIN)) { > dev->net_status &=3D (~VIRTIO_NET_S_LINK_UP); > PMD_DRV_LOG(ERR, "virtio-user port %u is down", dev- > >hw.port_id); > @@ -963,12 +956,6 @@ vhost_user_update_link_state(struct virtio_user_dev > *dev) > } else { > dev->net_status |=3D VIRTIO_NET_S_LINK_UP; > } > - > - if (fcntl(data->vhostfd, F_SETFL, > - flags & ~O_NONBLOCK) =3D=3D -1) { > - PMD_DRV_LOG(ERR, "error clearing O_NONBLOCK flag"); > - return -1; > - } > } else if (dev->is_server) { > dev->net_status &=3D (~VIRTIO_NET_S_LINK_UP); > if (virtio_user_dev_server_reconnect(dev) >=3D 0) > -- > 2.25.1 Reviewed-by: Chenbo Xia