xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

bnx2: switch to build_skb() infrastructure

Browse Source 
This is very similar to bnx2x conversion, but bnx2 only requires 16bytes
alignement at start of the received frame to store its l2_fhdr, so goal
was not to reduce skb truesize (in fact it should not change after this
patch)

Using build_skb() reduces cache line misses in the driver, since we
use cache hot skb instead of cold ones. Number of in-flight sk_buff
structures is lower, they are more likely recycled in SLUB caches
while still hot.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
CC: Michael Chan <mchan@broadcom.com>
CC: Eilon Greenstein <eilong@broadcom.com>
Reviewed-by: Michael Chan <mchan@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2011-11-15 07:30:05 +00:00
committed by David S. Miller
parent adc9300e78
commit dd2bc8e9c0
2 changed files with 85 additions and 69 deletions
Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/net/ethernet/broadcom/bnx2.h
View File

@@ -6563,12 +6563,25 @@ struct l2_fhdr {
#define MB_TX_CID_ADDR MB_GET_CID_ADDR(TX_CID)
#define MB_RX_CID_ADDR MB_GET_CID_ADDR(RX_CID)
/*
* This driver uses new build_skb() API :
* RX ring buffer contains pointer to kmalloc() data only,
* skb are built only after Hardware filled the frame.
*/
struct sw_bd {
struct sk_buff *skb;
struct l2_fhdr *desc;
u8 *data;
DEFINE_DMA_UNMAP_ADDR(mapping);
};
/* Its faster to compute this from data than storing it in sw_bd
* (less cache misses)
*/
static inline struct l2_fhdr *get_l2_fhdr(u8 *data)
{
return (struct l2_fhdr *)(PTR_ALIGN(data, BNX2_RX_ALIGN) + NET_SKB_PAD);
}
struct sw_pg {
struct page *page;
DEFINE_DMA_UNMAP_ADDR(mapping);