On Wed, 2017-02-01 at 19:10 +0200, Leon Romanovsky wrote:
> From: Erez Shitrit <erezsh@xxxxxxxxxxxx>
>
> When sending packet to destination that was not resolved yet
> via path query, the driver keeps the skb and tries to re-send it
> again when the path is resolved.
>
> But when re-sending via dev_queue_xmit the kernel doesn't call
> to dev_hard_header, so IPoIB needs to keep 20 bytes in the skb
> and to put the destination address inside them.
>
> In that way the dev_start_xmit will have the correct destination,
> and the driver won't take the destination from the skb->data, while
> nothing exists there, which causes to packet be be dropped.
>
> The test flow is:
> 1. Run the SM on remote node,
> 2. Restart the driver.
> 4. Ping some destination,
> 3. Observe that first ICMP request will be dropped.
>
> Fixes: fc791b633515 ("IB/ipoib: move back IB LL address into the hard
> header")
> Cc: <stable@xxxxxxxxxxxxxxx> # v4.8+
> Signed-off-by: Erez Shitrit <erezsh@xxxxxxxxxxxx>
> Signed-off-by: Noa Osherovich <noaos@xxxxxxxxxxxx>
> Signed-off-by: Leon Romanovsky <leon@xxxxxxxxxx>
Thanks, applied.
--
Doug Ledford <dledford@xxxxxxxxxx>
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