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From: Jens Freimann <jfreimann@redhat.com>
To: Ilya Maximets <i.maximets@samsung.com>
Cc: dev@dpdk.org, Maxime Coquelin <maxime.coquelin@redhat.com>,
	"Michael S . Tsirkin" <mst@redhat.com>,
	Tiwei Bie <tiwei.bie@intel.com>,
	Zhihong Wang <zhihong.wang@intel.com>,
	stable@dpdk.org
Subject: Re: [dpdk-dev] [PATCH 1/3] net/virtio: fix improper read barriers on packed Tx cleanup
Date: Fri, 25 Jan 2019 13:43:03 +0100	[thread overview]
Message-ID: <20190125124303.3ucuwd47ikikn3u6@jenstp.localdomain> (raw)
In-Reply-To: <20190124165902.24178-2-i.maximets@samsung.com>

On Thu, Jan 24, 2019 at 07:59:00PM +0300, Ilya Maximets wrote:
>Read barrier must be implied between reading descriptor flags
>and descriptor id. Otherwise, in case of reordering, we could
>read wrong descriptor id.
>
>For the reference, similar barrier for split rings is the read
>barrier between VIRTQUEUE_NUSED (reading the used->idx) and
>the call to the virtio_xmit_cleanup().
>
>Additionally removed double update of 'used_idx'. It's enough
>to set it in the end of the loop.
>
>Fixes: 892dc798fa9c ("net/virtio: implement Tx path for packed queues")
>Cc: stable@dpdk.org
>
>Signed-off-by: Ilya Maximets <i.maximets@samsung.com>
>---
> drivers/net/virtio/virtio_rxtx.c | 3 +--
> 1 file changed, 1 insertion(+), 2 deletions(-)
>

Reviewed-by: Jens Freimann <jfreimann@redhat.com>

  reply	other threads:[~2019-01-25 12:43 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <CGME20190124165910eucas1p212dd655a34f42e11048e85eb17c7d0d0@eucas1p2.samsung.com>
2019-01-24 16:58 ` [dpdk-dev] [PATCH 0/3] net/virtio: missing/wrong read barriers Ilya Maximets
     [not found]   ` <CGME20190124165914eucas1p111b991d9e398368f63da918290e768de@eucas1p1.samsung.com>
2019-01-24 16:59     ` [dpdk-dev] [PATCH 1/3] net/virtio: fix improper read barriers on packed Tx cleanup Ilya Maximets
2019-01-25 12:43       ` Jens Freimann [this message]
2019-01-25 12:49       ` Jens Freimann
     [not found]   ` <CGME20190124165917eucas1p21b83186e336b1099ee32937fa81d8cc7@eucas1p2.samsung.com>
2019-01-24 16:59     ` [dpdk-dev] [PATCH 2/3] net/virtio: add barriers for extra descriptors on Rx split Ilya Maximets
     [not found]   ` <CGME20190124165921eucas1p1fee7e668285fc26bc4f01c6b5ec0b66a@eucas1p1.samsung.com>
2019-01-24 16:59     ` [dpdk-dev] [PATCH 3/3] net/virtio: add missing read barrier for packed dequeue Ilya Maximets
2019-01-25 12:44       ` Jens Freimann
2019-01-25 12:48       ` Jens Freimann
2019-01-25  4:43   ` [dpdk-dev] [PATCH 0/3] net/virtio: missing/wrong read barriers Tiwei Bie
2019-01-25 15:50   ` Maxime Coquelin
2019-02-08 18:04   ` Maxime Coquelin

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