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nfp: avoid oversized TSO headers with metadata prepend 

In preparation for TSO over representors make sure the port id
prepend will always fit in the frame.  The current max header
length is 255, which is ample, so assume worst case scenario
of 8 byte prepend and save ourselves the conditionals.

Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Reviewed-by: Dirk van der Merwe <dirk.vandermerwe@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2018-11-27 22:24:52 -08:00 committed by David S. Miller
parent b54ad0eaad
commit d7cc825225
1 changed files with 4 additions and 1 deletions
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5
drivers/net/ethernet/netronome/nfp/nfp_net_common.c
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@ -3284,7 +3284,10 @@ nfp_net_features_check(struct sk_buff *skb, struct net_device *dev,
hdrlen = skb_inner_transport_header(skb) - skb->data +
inner_tcp_hdrlen(skb);
if (unlikely(hdrlen > NFP_NET_LSO_MAX_HDR_SZ))
/* Assume worst case scenario of having longest possible
* metadata prepend - 8B
*/
if (unlikely(hdrlen > NFP_NET_LSO_MAX_HDR_SZ - 8))
features &= ~NETIF_F_GSO_MASK;
}