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| author | Petri Gynther <pgynther@google.com> | 2016-03-24 11:27:21 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-03-24 15:11:40 -0400 |
| commit | 7dd399130efb5a454daf24075b7563d197114e39 (patch) | |
| tree | 7aeb9902b73897621a3594ea686aed37093ef1e4 | |
| parent | 55868120a3e5420bf5aa26a816c07d691579c9e6 (diff) | |
| download | lwn-7dd399130efb5a454daf24075b7563d197114e39.tar.gz lwn-7dd399130efb5a454daf24075b7563d197114e39.zip | |
net: bcmgenet: fix skb_len in bcmgenet_xmit_single()
skb_len needs to be skb_headlen(skb) in bcmgenet_xmit_single().
Fragmented skbs can have only Ethernet + IP + TCP headers (14+20+20=54 bytes)
in the linear buffer, followed by the rest in fragments. Bumping skb_len to
ETH_ZLEN would be incorrect for this case, as it would introduce garbage
between TCP header and the fragment data.
This also works with regular/non-fragmented small packets < ETH_ZLEN bytes.
Successfully tested this on GENETv3 with 42-byte ARP frames.
For testing, I used:
ethtool -K eth0 tx-checksum-ipv4 off
ethtool -K eth0 tx-checksum-ipv6 off
echo 0 > /proc/sys/net/ipv4/tcp_timestamps
Fixes: 1c1008c793fa ("net: bcmgenet: add main driver file")
Signed-off-by: Petri Gynther <pgynther@google.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/net/ethernet/broadcom/genet/bcmgenet.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/broadcom/genet/bcmgenet.c b/drivers/net/ethernet/broadcom/genet/bcmgenet.c index c1c7c0e6fb7c..cf6445d148ca 100644 --- a/drivers/net/ethernet/broadcom/genet/bcmgenet.c +++ b/drivers/net/ethernet/broadcom/genet/bcmgenet.c @@ -1297,7 +1297,7 @@ static int bcmgenet_xmit_single(struct net_device *dev, tx_cb_ptr->skb = skb; - skb_len = skb_headlen(skb) < ETH_ZLEN ? ETH_ZLEN : skb_headlen(skb); + skb_len = skb_headlen(skb); mapping = dma_map_single(kdev, skb->data, skb_len, DMA_TO_DEVICE); ret = dma_mapping_error(kdev, mapping); |