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ixgbe: Add support for UDP-encapsulated tx checksum offload

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By using GSO for UDP-encapsulated packets, all ixgbe devices can
be directed to generate checksums for the inner headers because
the outer UDP checksum can be zero. So point the machinery at the
inner headers and have the hardware generate the checksum.

Signed-off-by: Mark Rustad <mark.d.rustad@intel.com>
Tested-by: Phil Schmitt <phillip.j.schmitt@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Mark Rustad 2015-06-15 11:33:20 -07:00 committed by Jeff Kirsher
parent d490d15877
commit f467bc0602
1 changed files with 54 additions and 12 deletions
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66
drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
View File

@ -6912,31 +6912,55 @@ static void ixgbe_tx_csum(struct ixgbe_ring *tx_ring,
if (!(first->tx_flags & IXGBE_TX_FLAGS_HW_VLAN) &&
!(first->tx_flags & IXGBE_TX_FLAGS_CC))
return;
vlan_macip_lens = skb_network_offset(skb) <<
IXGBE_ADVTXD_MACLEN_SHIFT;
} else {
u8 l4_hdr = 0;
switch (first->protocol) {
case htons(ETH_P_IP):
vlan_macip_lens |= skb_network_header_len(skb);
union {
struct iphdr *ipv4;
struct ipv6hdr *ipv6;
u8 *raw;
} network_hdr;
union {
struct tcphdr *tcphdr;
u8 *raw;
} transport_hdr;
if (skb->encapsulation) {
network_hdr.raw = skb_inner_network_header(skb);
transport_hdr.raw = skb_inner_transport_header(skb);
vlan_macip_lens = skb_inner_network_offset(skb) <<
IXGBE_ADVTXD_MACLEN_SHIFT;
} else {
network_hdr.raw = skb_network_header(skb);
transport_hdr.raw = skb_transport_header(skb);
vlan_macip_lens = skb_network_offset(skb) <<
IXGBE_ADVTXD_MACLEN_SHIFT;
}
/* use first 4 bits to determine IP version */
switch (network_hdr.ipv4->version) {
case IPVERSION:
vlan_macip_lens |= transport_hdr.raw - network_hdr.raw;
type_tucmd |= IXGBE_ADVTXD_TUCMD_IPV4;
l4_hdr = ip_hdr(skb)->protocol;
l4_hdr = network_hdr.ipv4->protocol;
break;
case htons(ETH_P_IPV6):
vlan_macip_lens |= skb_network_header_len(skb);
l4_hdr = ipv6_hdr(skb)->nexthdr;
case 6:
vlan_macip_lens |= transport_hdr.raw - network_hdr.raw;
l4_hdr = network_hdr.ipv6->nexthdr;
break;
default:
if (unlikely(net_ratelimit())) {
dev_warn(tx_ring->dev,
"partial checksum but proto=%x!\n",
first->protocol);
"partial checksum but version=%d\n",
network_hdr.ipv4->version);
}
break;
}
switch (l4_hdr) {
case IPPROTO_TCP:
type_tucmd |= IXGBE_ADVTXD_TUCMD_L4T_TCP;
mss_l4len_idx = tcp_hdrlen(skb) <<
mss_l4len_idx = (transport_hdr.tcphdr->doff * 4) <<
IXGBE_ADVTXD_L4LEN_SHIFT;
break;
case IPPROTO_SCTP:
@ -6962,7 +6986,6 @@ static void ixgbe_tx_csum(struct ixgbe_ring *tx_ring,
}
/* vlan_macip_lens: MACLEN, VLAN tag */
vlan_macip_lens |= skb_network_offset(skb) << IXGBE_ADVTXD_MACLEN_SHIFT;
vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;
ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, 0,
@ -8207,6 +8230,21 @@ static void ixgbe_fwd_del(struct net_device *pdev, void *priv)
kfree(fwd_adapter);
}
#define IXGBE_MAX_TUNNEL_HDR_LEN 80
static netdev_features_t
ixgbe_features_check(struct sk_buff *skb, struct net_device *dev,
netdev_features_t features)
{
if (!skb->encapsulation)
return features;
if (unlikely(skb_inner_mac_header(skb) - skb_transport_header(skb) >
IXGBE_MAX_TUNNEL_HDR_LEN))
return features & ~NETIF_F_ALL_CSUM;
return features;
}
static const struct net_device_ops ixgbe_netdev_ops = {
.ndo_open = ixgbe_open,
.ndo_stop = ixgbe_close,
@ -8254,6 +8292,7 @@ static const struct net_device_ops ixgbe_netdev_ops = {
.ndo_dfwd_del_station = ixgbe_fwd_del,
.ndo_add_vxlan_port = ixgbe_add_vxlan_port,
.ndo_del_vxlan_port = ixgbe_del_vxlan_port,
.ndo_features_check = ixgbe_features_check,
};
/**
@ -8613,6 +8652,9 @@ skip_sriov:
netdev->vlan_features |= NETIF_F_IPV6_CSUM;
netdev->vlan_features |= NETIF_F_SG;
netdev->hw_enc_features |= NETIF_F_SG | NETIF_F_IP_CSUM |
NETIF_F_IPV6_CSUM;
netdev->priv_flags |= IFF_UNICAST_FLT;
netdev->priv_flags |= IFF_SUPP_NOFCS;