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be2net: fix TSO6/GSO issue causing TX-stall on Lancer/BEx 

IPv6 TSO requests with extension hdrs are a problem to the
Lancer and BEx chips. Workaround is to disable TSO6 feature
for such packets.

Also in Lancer chips, MSS less than 256 was resulting in TX stall.
Fix this by disabling GSO when MSS less than 256.

Signed-off-by: Suresh Reddy <suresh.reddy@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Suresh Reddy 2017-09-13 11:12:42 -04:00 committed by David S. Miller
parent 854426ef35
commit 822f8565c9
2 changed files with 22 additions and 0 deletions
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8
drivers/net/ethernet/emulex/benet/be.h
View File

@ -930,6 +930,14 @@ static inline bool is_ipv4_pkt(struct sk_buff *skb)
return skb->protocol == htons(ETH_P_IP) && ip_hdr(skb)->version == 4;
}
static inline bool is_ipv6_ext_hdr(struct sk_buff *skb)
{
if (ip_hdr(skb)->version == 6)
return ipv6_ext_hdr(ipv6_hdr(skb)->nexthdr);
else
return false;
}
#define be_error_recovering(adapter) \
(adapter->flags & BE_FLAGS_TRY_RECOVERY)

14
drivers/net/ethernet/emulex/benet/be_main.c
View File

@ -5089,6 +5089,20 @@ static netdev_features_t be_features_check(struct sk_buff *skb,
struct be_adapter *adapter = netdev_priv(dev);
u8 l4_hdr = 0;
if (skb_is_gso(skb)) {
/* IPv6 TSO requests with extension hdrs are a problem
* to Lancer and BE3 HW. Disable TSO6 feature.
*/
if (!skyhawk_chip(adapter) && is_ipv6_ext_hdr(skb))
features &= ~NETIF_F_TSO6;
/* Lancer cannot handle the packet with MSS less than 256.
* Disable the GSO support in such cases
*/
if (lancer_chip(adapter) && skb_shinfo(skb)->gso_size < 256)
features &= ~NETIF_F_GSO_MASK;
}
/* The code below restricts offload features for some tunneled and
* Q-in-Q packets.
* Offload features for normal (non tunnel) packets are unchanged.