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From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: Yuan Wang <yuanx.wang@intel.com>, chenbo.xia@intel.com, dev@dpdk.org
Cc: jiayu.hu@intel.com, xingguang.he@intel.com, stable@dpdk.org
Subject: Re: [PATCH] net/virtio: fix socket nonblocking mode affects initialization
Date: Fri, 1 Jul 2022 15:53:58 +0200	[thread overview]
Message-ID: <cfffba21-c354-1f33-6d77-cea34388f80a@redhat.com> (raw)
In-Reply-To: <20220617024229.706826-1-yuanx.wang@intel.com>



On 6/17/22 04:42, Yuan Wang wrote:
> 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.
> 
> Thread 1:
> virtio_init_device()
> --> virtio_user_start_device()
> 	--> vhost_user_set_memory_table()
> 		--> vhost_user_check_reply_ack()
> 
> Thread 2:
> virtio_interrupt_handler()
> --> vhost_user_update_link_state()
> 
> Fix that by replacing O_NONBLOCK with the recv per-call option
> MSG_DONTWAIT.
> 
> Fixes: ef53b6030039 ("net/virtio-user: support LSC")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Yuan Wang <yuanx.wang@intel.com>
> ---
>   drivers/net/virtio/virtio_user/vhost_user.c | 15 +--------------
>   1 file changed, 1 insertion(+), 14 deletions(-)
> 

Applied to dpdk-next-virtio/main.

Thanks,
Maxime


      parent reply	other threads:[~2022-07-01 13:54 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-06-17  2:42 Yuan Wang
2022-06-17  3:05 ` Stephen Hemminger
2022-07-01 10:11 ` Xia, Chenbo
2022-07-01 13:53 ` Maxime Coquelin [this message]

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