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be2net: Fix a UE caused by passing large frames to the ASIC

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In QnQ configurations like Flex-10 where the VLANs are inserted by the
ASIC, on rare occasions the HW is encountering a scenario where the
final frame length ends to be greater than what the ASIC can support.

This is because when the TXULP pulls the TX WRB to check the length
of the frame to be transmitted it also adds the size of VLANs to be
inserted by the HW to the length of the frame indicated in the WRB,
which in some cases fails the range check.  This causes a UE.

Avoid this by trimming the skb length to accommodate the VLAN insertion.

Signed-off-by: Ajit Khaparde <ajit.khaparde@broadcom.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
ajit.khaparde@broadcom.com 2016-02-23 00:35:01 +05:30 committed by David S. Miller
parent b0fd2eb28b
commit 127bfce541
2 changed files with 13 additions and 1 deletions
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3
drivers/net/ethernet/emulex/benet/be.h
View file

@ -72,6 +72,9 @@
#define BE_MAX_MTU (BE_MAX_JUMBO_FRAME_SIZE - \
(ETH_HLEN + ETH_FCS_LEN))
/* Accommodate for QnQ configurations where VLAN insertion is enabled in HW */
#define BE_MAX_GSO_SIZE (65535 - 2 * VLAN_HLEN)
#define BE_NUM_VLANS_SUPPORTED 64
#define BE_MAX_EQD 128u
#define BE_MAX_TX_FRAG_COUNT 30

11
drivers/net/ethernet/emulex/benet/be_main.c
View file

@ -1123,6 +1123,8 @@ static struct sk_buff *be_xmit_workarounds(struct be_adapter *adapter,
struct sk_buff *skb,
struct be_wrb_params *wrb_params)
{
int err;
/* Lancer, SH and BE3 in SRIOV mode have a bug wherein
* packets that are 32b or less may cause a transmit stall
* on that port. The workaround is to pad such packets
@ -1139,6 +1141,13 @@ static struct sk_buff *be_xmit_workarounds(struct be_adapter *adapter,
return NULL;
}
/* The stack can send us skbs with length greater than
* what the HW can handle. Trim the extra bytes.
*/
WARN_ON_ONCE(skb->len > BE_MAX_GSO_SIZE);
err = pskb_trim(skb, BE_MAX_GSO_SIZE);
WARN_ON(err);
return skb;
}
@ -4850,7 +4859,7 @@ static void be_netdev_init(struct net_device *netdev)
netdev->flags |= IFF_MULTICAST;
netif_set_gso_max_size(netdev, 65535 - ETH_HLEN);
netif_set_gso_max_size(netdev, BE_MAX_GSO_SIZE - ETH_HLEN);
netdev->netdev_ops = &be_netdev_ops;