From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Kirsher Subject: [net-next-2.6 PATCH 13/18] igb: move gso_segs into buffer_info structure Date: Wed, 17 Feb 2010 03:04:37 -0800 Message-ID: <20100217110436.17723.11162.stgit@localhost.localdomain> References: <20100217105953.17723.36633.stgit@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Cc: netdev@vger.kernel.org, gospo@redhat.com, Nicholas Nunley , Jeff Kirsher To: davem@davemloft.net Return-path: Received: from qmta06.emeryville.ca.mail.comcast.net ([76.96.30.56]:42821 "EHLO qmta06.emeryville.ca.mail.comcast.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755223Ab0BQLEz (ORCPT ); Wed, 17 Feb 2010 06:04:55 -0500 In-Reply-To: <20100217105953.17723.36633.stgit@localhost.localdomain> Sender: netdev-owner@vger.kernel.org List-ID: From: Nick Nunley 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 Signed-off-by: Jeff Kirsher --- drivers/net/igb/igb.h | 1 + drivers/net/igb/igb_main.c | 3 ++- 2 files changed, 3 insertions(+), 1 deletions(-) diff --git a/drivers/net/igb/igb.h b/drivers/net/igb/igb.h index 8f07bc0..7854b66 100644 --- a/drivers/net/igb/igb.h +++ b/drivers/net/igb/igb.h @@ -141,6 +141,7 @@ struct igb_buffer { u16 length; u16 next_to_watch; u16 mapped_as_page; + u16 gso_segs; }; /* RX */ struct { diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c index a1fe581..91c123f 100644 --- a/drivers/net/igb/igb_main.c +++ b/drivers/net/igb/igb_main.c @@ -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;