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authorAndrew Gallatin <gallatin@myri.com>2007-12-05 02:31:42 -0800
committerDavid S. Miller <davem@sunset.davemloft.net>2007-12-05 05:37:32 -0800
commit621544eb8c3beaa859c75850f816dd9b056a00a3 (patch)
tree15c4375c8899ced48bd751eb139cfe9b3778bda9
parent4e67d876ce07471e02be571038d5435a825f0215 (diff)
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[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 <gallatin@myri.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--drivers/net/myri10ge/myri10ge.c1
-rw-r--r--include/linux/inet_lro.h3
-rw-r--r--net/ipv4/inet_lro.c3
3 files changed, 6 insertions, 1 deletions
diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
index 0f306ddb5630..8def8657251f 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 1246d46abbc0..80335b7d77c5 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 ac3b1d3dba2e..9a96c277393d 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;