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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: dac7162a-01cf-4dd2-5e23-08da5b5dab0a X-MS-Exchange-CrossTenant-originalarrivaltime: 01 Jul 2022 12:31:48.5859 (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: HqgIW5kLEFyFEZxQbVcvrJeComa3AHS9PIgFISyIzedJGqwjt65NioKbEbVD7ivUNCA0/4kz2b5GYD+ebN+vDg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BN9PR11MB5516 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: Monday, June 27, 2022 1:51 PM > To: maxime.coquelin@redhat.com; Xia, Chenbo ; > dev@dpdk.org > Cc: Hu, Jiayu ; He, Xingguang ; > Jiang, Cheng1 ; Ling, WeiX ; > Wang, YuanX ; stable@dpdk.org > Subject: [PATCH v2] net/vhost: fix deadlock on vring state change >=20 > If vring state changes after pmd starts working, the locked vring > notifies pmd, thus calling update_queuing_status(), the latter > will wait for pmd to finish accessing vring, while pmd is also > waiting for vring to be unlocked, thus causing deadlock. >=20 > Actually, update_queuing_status() only needs to wait while > destroy/stopping the device, but not in other cases. >=20 > This patch adds a flag for whether or not to wait to fix this issue. >=20 > Fixes: 1ce3c7fe149f ("net/vhost: emulate device start/stop behavior") > Cc: stable@dpdk.org >=20 > Signed-off-by: Yuan Wang > --- > V2: rewrite the commit log. > --- > drivers/net/vhost/rte_eth_vhost.c | 16 ++++++++-------- > 1 file changed, 8 insertions(+), 8 deletions(-) >=20 > diff --git a/drivers/net/vhost/rte_eth_vhost.c > b/drivers/net/vhost/rte_eth_vhost.c > index d75d256040..7e512d94bf 100644 > --- a/drivers/net/vhost/rte_eth_vhost.c > +++ b/drivers/net/vhost/rte_eth_vhost.c > @@ -741,7 +741,7 @@ eth_vhost_install_intr(struct rte_eth_dev *dev) > } >=20 > static void > -update_queuing_status(struct rte_eth_dev *dev) > +update_queuing_status(struct rte_eth_dev *dev, bool wait_queuing) > { > struct pmd_internal *internal =3D dev->data->dev_private; > struct vhost_queue *vq; > @@ -767,7 +767,7 @@ update_queuing_status(struct rte_eth_dev *dev) > rte_atomic32_set(&vq->allow_queuing, 1); > else > rte_atomic32_set(&vq->allow_queuing, 0); > - while (rte_atomic32_read(&vq->while_queuing)) > + while (wait_queuing && rte_atomic32_read(&vq->while_queuing)) > rte_pause(); > } >=20 > @@ -779,7 +779,7 @@ update_queuing_status(struct rte_eth_dev *dev) > rte_atomic32_set(&vq->allow_queuing, 1); > else > rte_atomic32_set(&vq->allow_queuing, 0); > - while (rte_atomic32_read(&vq->while_queuing)) > + while (wait_queuing && rte_atomic32_read(&vq->while_queuing)) > rte_pause(); > } > } > @@ -868,7 +868,7 @@ new_device(int vid) > vhost_dev_csum_configure(eth_dev); >=20 > rte_atomic32_set(&internal->dev_attached, 1); > - update_queuing_status(eth_dev); > + update_queuing_status(eth_dev, false); >=20 > VHOST_LOG(INFO, "Vhost device %d created\n", vid); >=20 > @@ -898,7 +898,7 @@ destroy_device(int vid) > internal =3D eth_dev->data->dev_private; >=20 > rte_atomic32_set(&internal->dev_attached, 0); > - update_queuing_status(eth_dev); > + update_queuing_status(eth_dev, true); >=20 > eth_dev->data->dev_link.link_status =3D RTE_ETH_LINK_DOWN; >=20 > @@ -1008,7 +1008,7 @@ vring_state_changed(int vid, uint16_t vring, int > enable) > state->max_vring =3D RTE_MAX(vring, state->max_vring); > rte_spinlock_unlock(&state->lock); >=20 > - update_queuing_status(eth_dev); > + update_queuing_status(eth_dev, false); >=20 > VHOST_LOG(INFO, "vring%u is %s\n", > vring, enable ? "enabled" : "disabled"); > @@ -1197,7 +1197,7 @@ eth_dev_start(struct rte_eth_dev *eth_dev) > } >=20 > rte_atomic32_set(&internal->started, 1); > - update_queuing_status(eth_dev); > + update_queuing_status(eth_dev, false); >=20 > return 0; > } > @@ -1209,7 +1209,7 @@ eth_dev_stop(struct rte_eth_dev *dev) >=20 > dev->data->dev_started =3D 0; > rte_atomic32_set(&internal->started, 0); > - update_queuing_status(dev); > + update_queuing_status(dev, true); >=20 > return 0; > } > -- > 2.25.1 Reviewed-by: Chenbo Xia