Re: [Xen-devel] [PATCHv1 net] xen-netback: fix guest Rx stall detection (after guest Rx refactor)

[David Miller <davem@xxxxxxxxxxxxx>]

From: David Vrabel <david.vrabel@xxxxxxxxxx>
Date: Tue, 11 Oct 2016 16:48:27 +0100

> If a VIF has been ready for rx_stall_timeout (60s by default) and an
> Rx ring is drained of all requests an Rx stall will be incorrectly
> detected.  When this occurs and the guest Rx queue is empty, the Rx
> ring's event index will not be set and the frontend will not raise an
> event when new requests are placed on the ring, permanently stalling
> the VIF.
> 
> This is a regression introduced by eb1723a29b9a7 (xen-netback:
> refactor guest rx).
> 
> Fix this by reinstating the setting of queue->last_rx_time when
> placing a packet onto the guest Rx ring.
> 
> Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>

Applied.

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