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ixgbe/ixgbevf: Add support for GSO partial
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This patch adds support for partial GSO segmentation in the case of
tunnels.  Specifically with this change the driver an perform segmentation
as long as the frame either has IPv6 inner headers, or we are allowed to
mangle the IP IDs on the inner header.  This is needed because we will not
be modifying any fields from the start of the start of the outer transport
header to the start of the inner transport header as we are treating them
like they are just a block of IP options.

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>
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Alexander Duyck authored and Jeff Kirsher committed Apr 25, 2016
1 parent 8d055cc commit b83e301
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Showing 2 changed files with 180 additions and 82 deletions.
133 changes: 88 additions & 45 deletions drivers/net/ethernet/intel/ixgbe/ixgbe_main.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -7256,9 +7256,18 @@ static int ixgbe_tso(struct ixgbe_ring *tx_ring,
struct ixgbe_tx_buffer *first,
u8 *hdr_len)
{
u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
struct sk_buff *skb = first->skb;
u32 vlan_macip_lens, type_tucmd;
u32 mss_l4len_idx, l4len;
union {
struct iphdr *v4;
struct ipv6hdr *v6;
unsigned char *hdr;
} ip;
union {
struct tcphdr *tcp;
unsigned char *hdr;
} l4;
u32 paylen, l4_offset;
int err;

if (skb->ip_summed != CHECKSUM_PARTIAL)
Expand All @@ -7271,46 +7280,52 @@ static int ixgbe_tso(struct ixgbe_ring *tx_ring,
if (err < 0)
return err;

ip.hdr = skb_network_header(skb);
l4.hdr = skb_checksum_start(skb);

/* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
type_tucmd = IXGBE_ADVTXD_TUCMD_L4T_TCP;

if (first->protocol == htons(ETH_P_IP)) {
struct iphdr *iph = ip_hdr(skb);
iph->tot_len = 0;
iph->check = 0;
tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
iph->daddr, 0,
IPPROTO_TCP,
0);
/* initialize outer IP header fields */
if (ip.v4->version == 4) {
/* IP header will have to cancel out any data that
* is not a part of the outer IP header
*/
ip.v4->check = csum_fold(csum_add(lco_csum(skb),
csum_unfold(l4.tcp->check)));
type_tucmd |= IXGBE_ADVTXD_TUCMD_IPV4;

ip.v4->tot_len = 0;
first->tx_flags |= IXGBE_TX_FLAGS_TSO |
IXGBE_TX_FLAGS_CSUM |
IXGBE_TX_FLAGS_IPV4;
} else if (skb_is_gso_v6(skb)) {
ipv6_hdr(skb)->payload_len = 0;
tcp_hdr(skb)->check =
~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
&ipv6_hdr(skb)->daddr,
0, IPPROTO_TCP, 0);
} else {
ip.v6->payload_len = 0;
first->tx_flags |= IXGBE_TX_FLAGS_TSO |
IXGBE_TX_FLAGS_CSUM;
}

/* compute header lengths */
l4len = tcp_hdrlen(skb);
*hdr_len = skb_transport_offset(skb) + l4len;
/* determine offset of inner transport header */
l4_offset = l4.hdr - skb->data;

/* compute length of segmentation header */
*hdr_len = (l4.tcp->doff * 4) + l4_offset;

/* remove payload length from inner checksum */
paylen = skb->len - l4_offset;
csum_replace_by_diff(&l4.tcp->check, htonl(paylen));

/* update gso size and bytecount with header size */
first->gso_segs = skb_shinfo(skb)->gso_segs;
first->bytecount += (first->gso_segs - 1) * *hdr_len;

/* mss_l4len_id: use 0 as index for TSO */
mss_l4len_idx = l4len << IXGBE_ADVTXD_L4LEN_SHIFT;
mss_l4len_idx = (*hdr_len - l4_offset) << IXGBE_ADVTXD_L4LEN_SHIFT;
mss_l4len_idx |= skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;

/* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
vlan_macip_lens = skb_network_header_len(skb);
vlan_macip_lens |= skb_network_offset(skb) << IXGBE_ADVTXD_MACLEN_SHIFT;
vlan_macip_lens = l4.hdr - ip.hdr;
vlan_macip_lens |= (ip.hdr - skb->data) << IXGBE_ADVTXD_MACLEN_SHIFT;
vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;

ixgbe_tx_ctxtdesc(tx_ring, vlan_macip_lens, 0, type_tucmd,
Expand Down Expand Up @@ -8898,17 +8913,36 @@ static void ixgbe_fwd_del(struct net_device *pdev, void *priv)
kfree(fwd_adapter);
}

#define IXGBE_MAX_TUNNEL_HDR_LEN 80
#define IXGBE_MAX_MAC_HDR_LEN 127
#define IXGBE_MAX_NETWORK_HDR_LEN 511

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_CSUM_MASK;
unsigned int network_hdr_len, mac_hdr_len;

/* Make certain the headers can be described by a context descriptor */
mac_hdr_len = skb_network_header(skb) - skb->data;
if (unlikely(mac_hdr_len > IXGBE_MAX_MAC_HDR_LEN))
return features & ~(NETIF_F_HW_CSUM |
NETIF_F_SCTP_CRC |
NETIF_F_HW_VLAN_CTAG_TX |
NETIF_F_TSO |
NETIF_F_TSO6);

network_hdr_len = skb_checksum_start(skb) - skb_network_header(skb);
if (unlikely(network_hdr_len > IXGBE_MAX_NETWORK_HDR_LEN))
return features & ~(NETIF_F_HW_CSUM |
NETIF_F_SCTP_CRC |
NETIF_F_TSO |
NETIF_F_TSO6);

/* We can only support IPV4 TSO in tunnels if we can mangle the
* inner IP ID field, so strip TSO if MANGLEID is not supported.
*/
if (skb->encapsulation && !(features & NETIF_F_TSO_MANGLEID))
features &= ~NETIF_F_TSO;

return features;
}
Expand Down Expand Up @@ -9275,31 +9309,44 @@ static int ixgbe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
NETIF_F_TSO6 |
NETIF_F_RXHASH |
NETIF_F_RXCSUM |
NETIF_F_HW_CSUM |
NETIF_F_HW_VLAN_CTAG_TX |
NETIF_F_HW_VLAN_CTAG_RX |
NETIF_F_HW_VLAN_CTAG_FILTER;
NETIF_F_HW_CSUM;

#define IXGBE_GSO_PARTIAL_FEATURES (NETIF_F_GSO_GRE | \
NETIF_F_GSO_GRE_CSUM | \
NETIF_F_GSO_IPIP | \
NETIF_F_GSO_SIT | \
NETIF_F_GSO_UDP_TUNNEL | \
NETIF_F_GSO_UDP_TUNNEL_CSUM)

netdev->gso_partial_features = IXGBE_GSO_PARTIAL_FEATURES;
netdev->features |= NETIF_F_GSO_PARTIAL |
IXGBE_GSO_PARTIAL_FEATURES;

if (hw->mac.type >= ixgbe_mac_82599EB)
netdev->features |= NETIF_F_SCTP_CRC;

/* copy netdev features into list of user selectable features */
netdev->hw_features |= netdev->features;
netdev->hw_features |= NETIF_F_RXALL |
netdev->hw_features |= netdev->features |
NETIF_F_HW_VLAN_CTAG_RX |
NETIF_F_HW_VLAN_CTAG_TX |
NETIF_F_RXALL |
NETIF_F_HW_L2FW_DOFFLOAD;

if (hw->mac.type >= ixgbe_mac_82599EB)
netdev->hw_features |= NETIF_F_NTUPLE |
NETIF_F_HW_TC;

netdev->vlan_features |= NETIF_F_SG |
NETIF_F_TSO |
NETIF_F_TSO6 |
NETIF_F_HW_CSUM |
NETIF_F_SCTP_CRC;
if (pci_using_dac)
netdev->features |= NETIF_F_HIGHDMA;

/* set this bit last since it cannot be part of vlan_features */
netdev->features |= NETIF_F_HW_VLAN_CTAG_FILTER |
NETIF_F_HW_VLAN_CTAG_RX |
NETIF_F_HW_VLAN_CTAG_TX;

netdev->vlan_features |= netdev->features | NETIF_F_TSO_MANGLEID;
netdev->hw_enc_features |= netdev->vlan_features;
netdev->mpls_features |= NETIF_F_HW_CSUM;
netdev->hw_enc_features |= NETIF_F_HW_CSUM;

netdev->priv_flags |= IFF_UNICAST_FLT;
netdev->priv_flags |= IFF_SUPP_NOFCS;
Expand Down Expand Up @@ -9330,10 +9377,6 @@ static int ixgbe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
NETIF_F_FCOE_MTU;
}
#endif /* IXGBE_FCOE */
if (pci_using_dac) {
netdev->features |= NETIF_F_HIGHDMA;
netdev->vlan_features |= NETIF_F_HIGHDMA;
}

if (adapter->flags2 & IXGBE_FLAG2_RSC_CAPABLE)
netdev->hw_features |= NETIF_F_LRO;
Expand Down
129 changes: 92 additions & 37 deletions drivers/net/ethernet/intel/ixgbevf/ixgbevf_main.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -3272,9 +3272,18 @@ static int ixgbevf_tso(struct ixgbevf_ring *tx_ring,
struct ixgbevf_tx_buffer *first,
u8 *hdr_len)
{
u32 vlan_macip_lens, type_tucmd, mss_l4len_idx;
struct sk_buff *skb = first->skb;
u32 vlan_macip_lens, type_tucmd;
u32 mss_l4len_idx, l4len;
union {
struct iphdr *v4;
struct ipv6hdr *v6;
unsigned char *hdr;
} ip;
union {
struct tcphdr *tcp;
unsigned char *hdr;
} l4;
u32 paylen, l4_offset;
int err;

if (skb->ip_summed != CHECKSUM_PARTIAL)
Expand All @@ -3287,49 +3296,53 @@ static int ixgbevf_tso(struct ixgbevf_ring *tx_ring,
if (err < 0)
return err;

ip.hdr = skb_network_header(skb);
l4.hdr = skb_checksum_start(skb);

/* ADV DTYP TUCMD MKRLOC/ISCSIHEDLEN */
type_tucmd = IXGBE_ADVTXD_TUCMD_L4T_TCP;

if (first->protocol == htons(ETH_P_IP)) {
struct iphdr *iph = ip_hdr(skb);

iph->tot_len = 0;
iph->check = 0;
tcp_hdr(skb)->check = ~csum_tcpudp_magic(iph->saddr,
iph->daddr, 0,
IPPROTO_TCP,
0);
/* initialize outer IP header fields */
if (ip.v4->version == 4) {
/* IP header will have to cancel out any data that
* is not a part of the outer IP header
*/
ip.v4->check = csum_fold(csum_add(lco_csum(skb),
csum_unfold(l4.tcp->check)));
type_tucmd |= IXGBE_ADVTXD_TUCMD_IPV4;

ip.v4->tot_len = 0;
first->tx_flags |= IXGBE_TX_FLAGS_TSO |
IXGBE_TX_FLAGS_CSUM |
IXGBE_TX_FLAGS_IPV4;
} else if (skb_is_gso_v6(skb)) {
ipv6_hdr(skb)->payload_len = 0;
tcp_hdr(skb)->check =
~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
&ipv6_hdr(skb)->daddr,
0, IPPROTO_TCP, 0);
} else {
ip.v6->payload_len = 0;
first->tx_flags |= IXGBE_TX_FLAGS_TSO |
IXGBE_TX_FLAGS_CSUM;
}

/* compute header lengths */
l4len = tcp_hdrlen(skb);
*hdr_len += l4len;
*hdr_len = skb_transport_offset(skb) + l4len;
/* determine offset of inner transport header */
l4_offset = l4.hdr - skb->data;

/* compute length of segmentation header */
*hdr_len = (l4.tcp->doff * 4) + l4_offset;

/* update GSO size and bytecount with header size */
/* remove payload length from inner checksum */
paylen = skb->len - l4_offset;
csum_replace_by_diff(&l4.tcp->check, htonl(paylen));

/* update gso size and bytecount with header size */
first->gso_segs = skb_shinfo(skb)->gso_segs;
first->bytecount += (first->gso_segs - 1) * *hdr_len;

/* mss_l4len_id: use 1 as index for TSO */
mss_l4len_idx = l4len << IXGBE_ADVTXD_L4LEN_SHIFT;
mss_l4len_idx = (*hdr_len - l4_offset) << IXGBE_ADVTXD_L4LEN_SHIFT;
mss_l4len_idx |= skb_shinfo(skb)->gso_size << IXGBE_ADVTXD_MSS_SHIFT;
mss_l4len_idx |= (1u << IXGBE_ADVTXD_IDX_SHIFT);

/* vlan_macip_lens: HEADLEN, MACLEN, VLAN tag */
vlan_macip_lens = skb_network_header_len(skb);
vlan_macip_lens |= skb_network_offset(skb) << IXGBE_ADVTXD_MACLEN_SHIFT;
vlan_macip_lens = l4.hdr - ip.hdr;
vlan_macip_lens |= (ip.hdr - skb->data) << IXGBE_ADVTXD_MACLEN_SHIFT;
vlan_macip_lens |= first->tx_flags & IXGBE_TX_FLAGS_VLAN_MASK;

ixgbevf_tx_ctxtdesc(tx_ring, vlan_macip_lens,
Expand Down Expand Up @@ -3870,6 +3883,40 @@ static struct rtnl_link_stats64 *ixgbevf_get_stats(struct net_device *netdev,
return stats;
}

#define IXGBEVF_MAX_MAC_HDR_LEN 127
#define IXGBEVF_MAX_NETWORK_HDR_LEN 511

static netdev_features_t
ixgbevf_features_check(struct sk_buff *skb, struct net_device *dev,
netdev_features_t features)
{
unsigned int network_hdr_len, mac_hdr_len;

/* Make certain the headers can be described by a context descriptor */
mac_hdr_len = skb_network_header(skb) - skb->data;
if (unlikely(mac_hdr_len > IXGBEVF_MAX_MAC_HDR_LEN))
return features & ~(NETIF_F_HW_CSUM |
NETIF_F_SCTP_CRC |
NETIF_F_HW_VLAN_CTAG_TX |
NETIF_F_TSO |
NETIF_F_TSO6);

network_hdr_len = skb_checksum_start(skb) - skb_network_header(skb);
if (unlikely(network_hdr_len > IXGBEVF_MAX_NETWORK_HDR_LEN))
return features & ~(NETIF_F_HW_CSUM |
NETIF_F_SCTP_CRC |
NETIF_F_TSO |
NETIF_F_TSO6);

/* We can only support IPV4 TSO in tunnels if we can mangle the
* inner IP ID field, so strip TSO if MANGLEID is not supported.
*/
if (skb->encapsulation && !(features & NETIF_F_TSO_MANGLEID))
features &= ~NETIF_F_TSO;

return features;
}

static const struct net_device_ops ixgbevf_netdev_ops = {
.ndo_open = ixgbevf_open,
.ndo_stop = ixgbevf_close,
Expand All @@ -3888,7 +3935,7 @@ static const struct net_device_ops ixgbevf_netdev_ops = {
#ifdef CONFIG_NET_POLL_CONTROLLER
.ndo_poll_controller = ixgbevf_netpoll,
#endif
.ndo_features_check = passthru_features_check,
.ndo_features_check = ixgbevf_features_check,
};

static void ixgbevf_assign_netdev_ops(struct net_device *dev)
Expand Down Expand Up @@ -3999,23 +4046,31 @@ static int ixgbevf_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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;
#define IXGBEVF_GSO_PARTIAL_FEATURES (NETIF_F_GSO_GRE | \
NETIF_F_GSO_GRE_CSUM | \
NETIF_F_GSO_IPIP | \
NETIF_F_GSO_SIT | \
NETIF_F_GSO_UDP_TUNNEL | \
NETIF_F_GSO_UDP_TUNNEL_CSUM)

netdev->vlan_features |= NETIF_F_SG |
NETIF_F_TSO |
NETIF_F_TSO6 |
NETIF_F_HW_CSUM |
NETIF_F_SCTP_CRC;
netdev->gso_partial_features = IXGBEVF_GSO_PARTIAL_FEATURES;
netdev->hw_features |= NETIF_F_GSO_PARTIAL |
IXGBEVF_GSO_PARTIAL_FEATURES;

netdev->mpls_features |= NETIF_F_HW_CSUM;
netdev->hw_enc_features |= NETIF_F_HW_CSUM;
netdev->features = netdev->hw_features;

if (pci_using_dac)
netdev->features |= NETIF_F_HIGHDMA;

netdev->vlan_features |= netdev->features | NETIF_F_TSO_MANGLEID;
netdev->mpls_features |= NETIF_F_HW_CSUM;
netdev->hw_enc_features |= netdev->vlan_features;

/* set this bit last since it cannot be part of vlan_features */
netdev->features |= NETIF_F_HW_VLAN_CTAG_FILTER |
NETIF_F_HW_VLAN_CTAG_RX |
NETIF_F_HW_VLAN_CTAG_TX;

netdev->priv_flags |= IFF_UNICAST_FLT;

if (IXGBE_REMOVED(hw->hw_addr)) {
Expand Down

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