From: Andrew Gallatin Date: Wed, 5 Dec 2007 10:31:42 +0000 (-0800) Subject: [LRO]: fix lro_gen_skb() alignment X-Git-Tag: v2.6.24-rc5~64^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=621544eb8c3beaa859c75850f816dd9b056a00a3;p=platform%2Fupstream%2Fkernel-adaptation-pc.git [LRO]: fix lro_gen_skb() alignment Add a field to the lro_mgr struct so that drivers can specify how much padding is required to align layer 3 headers when a packet is copied into a freshly allocated skb by inet_lro.c:lro_gen_skb(). Without padding, skbs generated by LRO will cause alignment warnings on architectures which require strict alignment (seen on sparc64). Myri10GE is updated to use this field. Signed-off-by: Andrew Gallatin Signed-off-by: David S. Miller --- diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c index 0f306dd..8def865 100644 --- a/drivers/net/myri10ge/myri10ge.c +++ b/drivers/net/myri10ge/myri10ge.c @@ -1979,6 +1979,7 @@ static int myri10ge_open(struct net_device *dev) lro_mgr->lro_arr = mgp->rx_done.lro_desc; lro_mgr->get_frag_header = myri10ge_get_frag_header; lro_mgr->max_aggr = myri10ge_lro_max_pkts; + lro_mgr->frag_align_pad = 2; if (lro_mgr->max_aggr > MAX_SKB_FRAGS) lro_mgr->max_aggr = MAX_SKB_FRAGS; diff --git a/include/linux/inet_lro.h b/include/linux/inet_lro.h index 1246d46..80335b7 100644 --- a/include/linux/inet_lro.h +++ b/include/linux/inet_lro.h @@ -91,6 +91,9 @@ struct net_lro_mgr { int max_desc; /* Max number of LRO descriptors */ int max_aggr; /* Max number of LRO packets to be aggregated */ + int frag_align_pad; /* Padding required to properly align layer 3 + * headers in generated skb when using frags */ + struct net_lro_desc *lro_arr; /* Array of LRO descriptors */ /* diff --git a/net/ipv4/inet_lro.c b/net/ipv4/inet_lro.c index ac3b1d3..9a96c27 100644 --- a/net/ipv4/inet_lro.c +++ b/net/ipv4/inet_lro.c @@ -401,10 +401,11 @@ static struct sk_buff *lro_gen_skb(struct net_lro_mgr *lro_mgr, int data_len = len; int hdr_len = min(len, hlen); - skb = netdev_alloc_skb(lro_mgr->dev, hlen); + skb = netdev_alloc_skb(lro_mgr->dev, hlen + lro_mgr->frag_align_pad); if (!skb) return NULL; + skb_reserve(skb, lro_mgr->frag_align_pad); skb->len = len; skb->data_len = len - hdr_len; skb->truesize += true_size;