From 638c5115a794981441246fa8fa5d95c1875af5ba Mon Sep 17 00:00:00 2001
From: Ming Lei <ming.lei@canonical.com>
Date: Thu, 8 Aug 2013 21:48:24 +0800
Subject: 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>
---
 include/linux/usb/usbnet.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'include/linux/usb/usbnet.h')

diff --git a/include/linux/usb/usbnet.h b/include/linux/usb/usbnet.h
index f18d641..2b47e63 100644
--- a/include/linux/usb/usbnet.h
+++ b/include/linux/usb/usbnet.h
@@ -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;
-- 
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