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ixgbevf: Add support for generic Tx checksums

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This patch adds support for generic Tx checksums to the ixgbevf driver.  It
turns out this is actually pretty easy after going over the datasheet as we
were doing a number of steps we didn't need to.

In order to perform a Tx checksum for an L4 header we need to fill in the
following fields in the Tx descriptor:
  MACLEN (maximum of 127), retrieved from:
		skb_network_offset()
  IPLEN  (maximum of 511), retrieved from:
		skb_checksum_start_offset() - skb_network_offset()
  TUCMD.L4T indicates offset and if checksum or crc32c, based on:
		skb->csum_offset

The added advantage to doing this is that we can support inner checksum
offloads for tunnels and MPLS while still being able to transparently
insert VLAN tags.

I also took the opportunity to clean-up many of the feature flag
configuration bits to make them a bit more consistent between drivers.  In
the case of the VF drivers this meant adding support for SCTP CRCs, and
inner checksum offloads for MPLS and various tunnel types.

Signed-off-by: Alexander Duyck <aduyck@mirantis.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck 2016-01-13 07:31:17 -08:00 committed by Jeff Kirsher
parent 49763de042
commit cb2b3edbec
1 changed files with 43 additions and 61 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

104
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
View File

@ -3334,76 +3334,55 @@ static int ixgbevf_tso(struct ixgbevf_ring *tx_ring,
return 1;
}
static inline bool ixgbevf_ipv6_csum_is_sctp(struct sk_buff *skb)
{
unsigned int offset = 0;
ipv6_find_hdr(skb, &offset, IPPROTO_SCTP, NULL, NULL);
return offset == skb_checksum_start_offset(skb);
}
static void ixgbevf_tx_csum(struct ixgbevf_ring *tx_ring,
struct ixgbevf_tx_buffer *first)
{
struct sk_buff *skb = first->skb;
u32 vlan_macip_lens = 0;
u32 mss_l4len_idx = 0;
u32 type_tucmd = 0;
if (skb->ip_summed == CHECKSUM_PARTIAL) {
u8 l4_hdr = 0;
__be16 frag_off;
if (skb->ip_summed != CHECKSUM_PARTIAL)
goto no_csum;
switch (first->protocol) {
case htons(ETH_P_IP):
vlan_macip_lens |= skb_network_header_len(skb);
type_tucmd |= IXGBE_ADVTXD_TUCMD_IPV4;
l4_hdr = ip_hdr(skb)->protocol;
break;
case htons(ETH_P_IPV6):
vlan_macip_lens |= skb_network_header_len(skb);
l4_hdr = ipv6_hdr(skb)->nexthdr;
if (likely(skb_network_header_len(skb) ==
sizeof(struct ipv6hdr)))
break;
ipv6_skip_exthdr(skb, skb_network_offset(skb) +
sizeof(struct ipv6hdr),
&l4_hdr, &frag_off);
if (unlikely(frag_off))
l4_hdr = NEXTHDR_FRAGMENT;
break;
default:
switch (skb->csum_offset) {
case offsetof(struct tcphdr, check):
type_tucmd = IXGBE_ADVTXD_TUCMD_L4T_TCP;
/* fall through */
case offsetof(struct udphdr, check):
break;
case offsetof(struct sctphdr, checksum):
/* validate that this is actually an SCTP request */
if (((first->protocol == htons(ETH_P_IP)) &&
(ip_hdr(skb)->protocol == IPPROTO_SCTP)) ||
((first->protocol == htons(ETH_P_IPV6)) &&
ixgbevf_ipv6_csum_is_sctp(skb))) {
type_tucmd = IXGBE_ADVTXD_TUCMD_L4T_SCTP;
break;
}
switch (l4_hdr) {
case IPPROTO_TCP:
type_tucmd |= IXGBE_ADVTXD_TUCMD_L4T_TCP;
mss_l4len_idx = tcp_hdrlen(skb) <<
IXGBE_ADVTXD_L4LEN_SHIFT;
break;
case IPPROTO_SCTP:
type_tucmd |= IXGBE_ADVTXD_TUCMD_L4T_SCTP;
mss_l4len_idx = sizeof(struct sctphdr) <<
IXGBE_ADVTXD_L4LEN_SHIFT;
break;
case IPPROTO_UDP:
mss_l4len_idx = sizeof(struct udphdr) <<
IXGBE_ADVTXD_L4LEN_SHIFT;
break;
default:
if (unlikely(net_ratelimit())) {
dev_warn(tx_ring->dev,
"partial checksum, l3 proto=%x, l4 proto=%x\n",
first->protocol, l4_hdr);
}
skb_checksum_help(skb);
goto no_csum;
}
/* update TX checksum flag */
first->tx_flags |= IXGBE_TX_FLAGS_CSUM;
/* fall through */
default:
skb_checksum_help(skb);
goto no_csum;
}
/* update TX checksum flag */
first->tx_flags |= IXGBE_TX_FLAGS_CSUM;
vlan_macip_lens = skb_checksum_start_offset(skb) -
skb_network_offset(skb);
no_csum:
/* 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;
ixgbevf_tx_ctxtdesc(tx_ring, vlan_macip_lens,
type_tucmd, mss_l4len_idx);
ixgbevf_tx_ctxtdesc(tx_ring, vlan_macip_lens, type_tucmd, 0);
}
static __le32 ixgbevf_tx_cmd_type(u32 tx_flags)
@ -4010,22 +3989,25 @@ static int ixgbevf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
}
netdev->hw_features = NETIF_F_SG |
NETIF_F_IP_CSUM |
NETIF_F_IPV6_CSUM |
NETIF_F_TSO |
NETIF_F_TSO6 |
NETIF_F_RXCSUM;
NETIF_F_RXCSUM |
NETIF_F_HW_CSUM |
NETIF_F_SCTP_CRC;
netdev->features = netdev->hw_features |
NETIF_F_HW_VLAN_CTAG_TX |
NETIF_F_HW_VLAN_CTAG_RX |
NETIF_F_HW_VLAN_CTAG_FILTER;
netdev->vlan_features |= NETIF_F_TSO |
netdev->vlan_features |= NETIF_F_SG |
NETIF_F_TSO |
NETIF_F_TSO6 |
NETIF_F_IP_CSUM |
NETIF_F_IPV6_CSUM |
NETIF_F_SG;
NETIF_F_HW_CSUM |
NETIF_F_SCTP_CRC;
netdev->mpls_features |= NETIF_F_HW_CSUM;
netdev->hw_enc_features |= NETIF_F_HW_CSUM;
if (pci_using_dac)
netdev->features |= NETIF_F_HIGHDMA;