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USBNET: support DMA SG

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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>
This commit is contained in:
Ming Lei
2013-08-08 21:48:24 +08:00
committed by Greg Kroah-Hartman
parent fc76051c45
commit 638c5115a7
2 changed files with 43 additions and 3 deletions
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1
include/linux/usb/usbnet.h
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@@ -34,6 +34,7 @@ struct usbnet {
struct mutex phy_mutex;
unsigned char suspend_count;
unsigned char pkt_cnt, pkt_err;
unsigned can_dma_sg:1;
/* i/o info: pipes etc */
unsigned in, out;