USBNET: support DMA SG
authorMing Lei <ming.lei@canonical.com>
Thu, 8 Aug 2013 13:48:24 +0000 (21:48 +0800)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 12 Aug 2013 19:09:23 +0000 (12:09 -0700)
commit638c5115a794981441246fa8fa5d95c1875af5ba
tree43c74854c39e728fb80b82707f80b0f499598d7d
parentfc76051c453b4e65e736aed10e57192adcbcd453
USBNET: support DMA SG

This patch introduces support of DMA SG if the USB host controller
which usbnet device is attached to is capable of building packet from
discontinuous buffers.

The patch supports passing the skb fragment buffers to usb stack directly
via urb->sg.

Cc: Ben Hutchings <bhutchings@solarflare.com>
Cc: Grant Grundler <grundler@google.com>
Cc: Freddy Xin <freddy@asix.com.tw>
Cc: Alan Stern <stern@rowland.harvard.edu>
Acked-by: Oliver Neukum <oneukum@suse.de>
Signed-off-by: Ming Lei <ming.lei@canonical.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
drivers/net/usb/usbnet.c
include/linux/usb/usbnet.h