[PATCH] S2io: Multi buffer mode support

Hi,
This patch  provides dynamic two buffer-mode and 3 buffer-mode options.
Previously 2 buffer-mode was compilation option. Now with this patch applied
one can load driver in 2 buffer-mode with module-load parameter

ie.
#insmod s2io.ko rx_ring_mode=2

This patch also provides 3 buffer-mode which provides header separation
functionality. In 3 buffer-mode skb->data will have L2/L3/L4 headers and
"skb_shinfo(skb)->frag_list->data" will have have L4 payload.
one can load driver in 3 buffer-mode with same above module-load parameter

ie.
#insmod s2io.ko rx_ring_mode=3

Please review the patch.

Signed-off-by: Ananda Raju <ananda.raju@neterion.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

drivers/net/Kconfig

@@ -2258,17 +2258,6 @@ config S2IO_NAPI
 
 	  If in doubt, say N.
 
-config 2BUFF_MODE
-	bool "Use 2 Buffer Mode on Rx side."
-	depends on S2IO
-	---help---
-	On enabling the 2 buffer mode, the received frame will be
-	split into 2 parts before being DMA'ed to the hosts memory.
-	The parts are the ethernet header and ethernet payload. 
-	This is useful on systems where DMA'ing to to unaligned 
-	physical memory loactions comes with a heavy price.
-	If not sure please say N.
-
 endmenu
 
 if !UML