From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Michael S. Tsirkin" Subject: Re: [PATCH net-next 1/2] net: introduce skb_coalesce_rx_frag() Date: Thu, 31 Oct 2013 13:41:28 +0200 Message-ID: <20131031114128.GC8976@redhat.com> References: <1383215313-23651-1-git-send-email-jasowang@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: mwdalton@google.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, virtualization@lists.linux-foundation.org, edumazet@google.com, davem@davemloft.net To: Jason Wang Return-path: Content-Disposition: inline In-Reply-To: <1383215313-23651-1-git-send-email-jasowang@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: virtualization-bounces@lists.linux-foundation.org Errors-To: virtualization-bounces@lists.linux-foundation.org List-Id: netdev.vger.kernel.org On Thu, Oct 31, 2013 at 06:28:32PM +0800, Jason Wang wrote: > 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 Acked-by: Michael S. Tsirkin > --- > 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