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From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>,
	Chenbo Xia <chenbo.xia@intel.com>,
	Jianfeng Tan <jianfeng.tan@intel.com>,
	Huawei Xie <huawei.xie@intel.com>
Cc: dev@dpdk.org, Ivan Ilchenko <ivan.ilchenko@oktetlabs.ru>,
	stable@dpdk.org
Subject: Re: [dpdk-dev] [PATCH] net/virtio: turn SW RxQ size to that of split vec. virtqueue
Date: Tue, 14 Sep 2021 13:26:07 +0200	[thread overview]
Message-ID: <22100145-7894-2e12-cb30-9e2b7f120b5b@redhat.com> (raw)
In-Reply-To: <20210820124752.3522683-1-andrew.rybchenko@oktetlabs.ru>



On 8/20/21 2:47 PM, Andrew Rybchenko wrote:
> From: Ivan Ilchenko <ivan.ilchenko@oktetlabs.ru>
> 
> Descriptors number may be set less than queue size for split queue
> vectorized Rx path. Pointers to mbufs for received packets are
> obtained from SW ring, that is initially filled with them in the end
> of queue setup in virtio_dev_rx_queue_setup_finish(). The begin of the
> SW ring filled up to the size of descriptors number. At queue size
> offset from the begin of the SW ring pointers to some fake mbuf are also
> set for wrapping purpose. So the ring may contains the hole of invalid
> pointers from descriptors number offset to queue size offset, and split
> vectorized Rx routines could write to the invalid addresses since they
> use the ring up to the queue size. Fix this by setting descriptors
> number to queue size on Rx queue setup.
> 
> Fixes: fc3d66212fed ("virtio: add vector Rx")
> Cc: stable@dpdk.org
> 
> Signed-off-by: Ivan Ilchenko <ivan.ilchenko@oktetlabs.ru>
> Signed-off-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
> ---
>  drivers/net/virtio/virtio_rxtx.c | 8 +++++++-
>  1 file changed, 7 insertions(+), 1 deletion(-)
> 

Applied to dpdk-next-virtio/main.

Thanks,
Maxime


      parent reply	other threads:[~2021-09-14 11:26 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-20 12:47 Andrew Rybchenko
2021-09-13 19:46 ` Maxime Coquelin
2021-09-14 11:26 ` Maxime Coquelin [this message]

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