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igb: move gso_segs into buffer_info structure

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This change moves gso_segs into the buffer_info structure to avoid
a possible cache line miss in clean_tx_irq.

Signed-off-by: Nicholas Nunley <nicholasx.d.nunley@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nick Nunley 2010-02-17 01:04:37 +00:00 committed by David S. Miller
parent 717ba08935
commit 40e90c26f5
2 changed files with 3 additions and 1 deletions
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1
drivers/net/igb/igb.h
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@ -141,6 +141,7 @@ struct igb_buffer {
u16 length;
u16 next_to_watch;
u16 mapped_as_page;
u16 gso_segs;
};
/* RX */
struct {

3
drivers/net/igb/igb_main.c
View File

@ -3641,6 +3641,7 @@ static inline int igb_tx_map_adv(struct igb_ring *tx_ring, struct sk_buff *skb,
}
tx_ring->buffer_info[i].skb = skb;
tx_ring->buffer_info[i].gso_segs = skb_shinfo(skb)->gso_segs ?: 1;
tx_ring->buffer_info[first].next_to_watch = i;
return ++count;
@ -5032,7 +5033,7 @@ static bool igb_clean_tx_irq(struct igb_q_vector *q_vector)
if (skb) {
unsigned int segs, bytecount;
/* gso_segs is currently only valid for tcp */
segs = skb_shinfo(skb)->gso_segs ?: 1;
segs = buffer_info->gso_segs;
/* multiply data chunks by size of headers */
bytecount = ((segs - 1) * skb_headlen(skb)) +
skb->len;