Re: [PATCH net 1/1] net/af_iucv: don't use paged skbs for TX on HiperSockets

David Miller
2017-01-11T02:07:11Z

From: Ursula Braun <ubraun@linux.vnet.ibm.com>
Date: Tue, 10 Jan 2017 17:10:34 +0100

> From: Julian Wiedmann <jwi@linux.vnet.ibm.com>
>
> With commit e53743994e21
> ("af_iucv: use paged SKBs for big outbound messages"),
> we transmit paged skbs for both of AF_IUCV's transport modes
> (IUCV or HiperSockets).
> The qeth driver for Layer 3 HiperSockets currently doesn't
> support NETIF_F_SG, so these skbs would just be linearized again
> by the stack.
> Avoid that overhead by using paged skbs only for IUCV transport.
>
> cc stable, since this also circumvents a significant skb leak when
> sending large messages (where the skb then needs to be linearized).
>
> Signed-off-by: Julian Wiedmann <jwi@linux.vnet.ibm.com>
> Signed-off-by: Ursula Braun <ubraun@linux.vnet.ibm.com>
> Cc: <stable@vger.kernel.org> # v4.8+
> Fixes: e53743994e21 ("af_iucv: use paged SKBs for big outbound messages")

Applied.