Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753751Ab3JaK25 (ORCPT ); Thu, 31 Oct 2013 06:28:57 -0400 Received: from mx1.redhat.com ([209.132.183.28]:24343 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751797Ab3JaK24 (ORCPT ); Thu, 31 Oct 2013 06:28:56 -0400 From: Jason Wang To: davem@davemloft.net, edumazet@google.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org, mst@redhat.com, rusty@rustcorp.com.au, mwdalton@google.com, virtualization@lists.linux-foundation.org Cc: Jason Wang Subject: [PATCH net-next 1/2] net: introduce skb_coalesce_rx_frag() Date: Thu, 31 Oct 2013 18:28:32 +0800 Message-Id: <1383215313-23651-1-git-send-email-jasowang@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2146 Lines: 60 Sometimes we need to coalesce the rx frags to avoid frag list. One example is virtio-net driver which tries to use small frags for both MTU sized packet and GSO packet. So this patch introduce skb_coalesce_rx_frag() to do this. Cc: Rusty Russell Cc: Michael S. Tsirkin Cc: Michael Dalton Cc: Eric Dumazet Signed-off-by: Jason Wang --- include/linux/skbuff.h | 3 +++ net/core/skbuff.c | 13 +++++++++++++ 2 files changed, 16 insertions(+) diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h index 2c15497..e34652b 100644 --- a/include/linux/skbuff.h +++ b/include/linux/skbuff.h @@ -1372,6 +1372,9 @@ static inline void skb_fill_page_desc(struct sk_buff *skb, int i, void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off, int size, unsigned int truesize); +void skb_coalesce_rx_frag(struct sk_buff *skb, int i, int off, int size, + unsigned int truesize); + #define SKB_PAGE_ASSERT(skb) BUG_ON(skb_shinfo(skb)->nr_frags) #define SKB_FRAG_ASSERT(skb) BUG_ON(skb_has_frag_list(skb)) #define SKB_LINEAR_ASSERT(skb) BUG_ON(skb_is_nonlinear(skb)) diff --git a/net/core/skbuff.c b/net/core/skbuff.c index 0ab32fa..fdef994 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -476,6 +476,19 @@ void skb_add_rx_frag(struct sk_buff *skb, int i, struct page *page, int off, } EXPORT_SYMBOL(skb_add_rx_frag); +void skb_coalesce_rx_frag(struct sk_buff *skb, int i, int off, int size, + unsigned int truesize) +{ + skb_frag_t *frag = &skb_shinfo(skb)->frags[i]; + + skb_frag_size_add(frag, size); + skb->len += size; + skb->data_len += size; + skb->truesize += truesize; + skb_frag_unref(skb, i); +} +EXPORT_SYMBOL(skb_coalesce_rx_frag); + static void skb_drop_list(struct sk_buff **listp) { kfree_skb_list(*listp); -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/