diff options
| author |   Manish Chopra <manish.chopra@caviumnetworks.com> | 2016-10-14 05:19:19 -0400 |
|---|---|---|
| committer |   David S. Miller <davem@davemloft.net> | 2016-10-14 11:59:58 -0400 |
| commit | 256958538ae2616e4aa14efab8c0d11df1e188db (patch) | |
| tree | 4c6eb27cae990295f1c2be9c38ca548043adb227 /drivers/net/ethernet/qlogic/qede/qede_main.c | |
| parent | qede: GSO support for tunnels with outer csum (diff) | |
| download | linux-dev-256958538ae2616e4aa14efab8c0d11df1e188db.tar.xz linux-dev-256958538ae2616e4aa14efab8c0d11df1e188db.zip | |
qede: Prevent GSO on long Geneve headers
Due to hardware limitation, when transmitting a geneve-encapsulated
packet with more than 32 bytes worth of geneve options the hardware
would not be able to crack the packet and consider it a regular UDP
packet.
This implements the ndo_features_check() in qede in order to prevent
GSO on said transmitted packets.
Signed-off-by: Manish Chopra <manish.chopra@caviumnetworks.com>
Signed-off-by: Yuval Mintz <Yuval.Mintz@caviumnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to '')
| -rw-r--r-- | drivers/net/ethernet/qlogic/qede/qede_main.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/drivers/net/ethernet/qlogic/qede/qede_main.c b/drivers/net/ethernet/qlogic/qede/qede_main.c index 7d5dc1e15fc4..6c2b09c255d5 100644 --- a/drivers/net/ethernet/qlogic/qede/qede_main.c +++ b/drivers/net/ethernet/qlogic/qede/qede_main.c @@ -2240,6 +2240,40 @@ static void qede_udp_tunnel_del(struct net_device *dev, schedule_delayed_work(&edev->sp_task, 0); } +/* 8B udp header + 8B base tunnel header + 32B option length */ +#define QEDE_MAX_TUN_HDR_LEN 48 + +static netdev_features_t qede_features_check(struct sk_buff *skb, + struct net_device *dev, + netdev_features_t features) +{ + if (skb->encapsulation) { + u8 l4_proto = 0; + + switch (vlan_get_protocol(skb)) { + case htons(ETH_P_IP): + l4_proto = ip_hdr(skb)->protocol; + break; + case htons(ETH_P_IPV6): + l4_proto = ipv6_hdr(skb)->nexthdr; + break; + default: + return features; + } + + /* Disable offloads for geneve tunnels, as HW can't parse + * the geneve header which has option length greater than 32B. + */ + if ((l4_proto == IPPROTO_UDP) && + ((skb_inner_mac_header(skb) - + skb_transport_header(skb)) > QEDE_MAX_TUN_HDR_LEN)) + return features & ~(NETIF_F_CSUM_MASK | + NETIF_F_GSO_MASK); + } + + return features; +} + static const struct net_device_ops qede_netdev_ops = { .ndo_open = qede_open, .ndo_stop = qede_close, @@ -2264,6 +2298,7 @@ static const struct net_device_ops qede_netdev_ops = { #endif .ndo_udp_tunnel_add = qede_udp_tunnel_add, .ndo_udp_tunnel_del = qede_udp_tunnel_del, + .ndo_features_check = qede_features_check, }; /* ------------------------------------------------------------------------- |