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Date: Mon, 4 Apr 2016 15:14:52 -0700
From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To: davem@...emloft.net
Cc: Alexander Duyck <aduyck@...antis.com>, netdev@...r.kernel.org,
nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com,
Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 09/14] ixgbevf: Add support for generic Tx checksums
From: Alexander Duyck <aduyck@...antis.com>
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@...antis.com>
Tested-by: Andrew Bowers <andrewx.bowers@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c | 104 +++++++++-------------
1 file changed, 43 insertions(+), 61 deletions(-)
diff --git a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
index 9a2eed0..50b6bff 100644
--- a/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
+++ b/drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
@@ -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;
-
- 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:
- break;
- }
+ if (skb->ip_summed != CHECKSUM_PARTIAL)
+ goto no_csum;
- 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;
+ 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;
- 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;
--
2.5.5
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