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enic: add vxlan offload on tx path

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Define ndo_features_check. Hw supports offload only for ipv4 inner and
ipv4 outer pkt.

Code refactor for setting inner tcp pseudo csum.

Signed-off-by: Govindarajulu Varadarajan <gvaradar@cisco.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Govindarajulu Varadarajan 2017-02-08 16:43:09 -08:00 committed by David S. Miller
parent 257e738238
commit 9c744d1087
1 changed files with 114 additions and 12 deletions
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126
drivers/net/ethernet/cisco/enic/enic_main.c
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@ -263,6 +263,48 @@ unlock:
spin_unlock_bh(&enic->devcmd_lock);
}
static netdev_features_t enic_features_check(struct sk_buff *skb,
struct net_device *dev,
netdev_features_t features)
{
const struct ethhdr *eth = (struct ethhdr *)skb_inner_mac_header(skb);
struct enic *enic = netdev_priv(dev);
struct udphdr *udph;
u16 port = 0;
u16 proto;
if (!skb->encapsulation)
return features;
features = vxlan_features_check(skb, features);
/* hardware only supports IPv4 vxlan tunnel */
if (vlan_get_protocol(skb) != htons(ETH_P_IP))
goto out;
/* hardware does not support offload of ipv6 inner pkt */
if (eth->h_proto != ntohs(ETH_P_IP))
goto out;
proto = ip_hdr(skb)->protocol;
if (proto == IPPROTO_UDP) {
udph = udp_hdr(skb);
port = be16_to_cpu(udph->dest);
}
/* HW supports offload of only one UDP port. Remove CSUM and GSO MASK
* for other UDP port tunnels
*/
if (port != enic->vxlan.vxlan_udp_port_number)
goto out;
return features;
out:
return features & ~(NETIF_F_CSUM_MASK | NETIF_F_GSO_MASK);
}
int enic_is_dynamic(struct enic *enic)
{
return enic->pdev->device == PCI_DEVICE_ID_CISCO_VIC_ENET_DYN;
@ -591,20 +633,19 @@ static int enic_queue_wq_skb_csum_l4(struct enic *enic, struct vnic_wq *wq,
return err;
}
static int enic_queue_wq_skb_tso(struct enic *enic, struct vnic_wq *wq,
struct sk_buff *skb, unsigned int mss,
int vlan_tag_insert, unsigned int vlan_tag,
int loopback)
static void enic_preload_tcp_csum_encap(struct sk_buff *skb)
{
unsigned int frag_len_left = skb_headlen(skb);
unsigned int len_left = skb->len - frag_len_left;
unsigned int hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
int eop = (len_left == 0);
unsigned int len;
dma_addr_t dma_addr;
unsigned int offset = 0;
skb_frag_t *frag;
if (skb->protocol == cpu_to_be16(ETH_P_IP)) {
inner_ip_hdr(skb)->check = 0;
inner_tcp_hdr(skb)->check =
~csum_tcpudp_magic(inner_ip_hdr(skb)->saddr,
inner_ip_hdr(skb)->daddr, 0,
IPPROTO_TCP, 0);
}
}
static void enic_preload_tcp_csum(struct sk_buff *skb)
{
/* Preload TCP csum field with IP pseudo hdr calculated
* with IP length set to zero. HW will later add in length
* to each TCP segment resulting from the TSO.
@ -618,6 +659,30 @@ static int enic_queue_wq_skb_tso(struct enic *enic, struct vnic_wq *wq,
tcp_hdr(skb)->check = ~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
&ipv6_hdr(skb)->daddr, 0, IPPROTO_TCP, 0);
}
}
static int enic_queue_wq_skb_tso(struct enic *enic, struct vnic_wq *wq,
struct sk_buff *skb, unsigned int mss,
int vlan_tag_insert, unsigned int vlan_tag,
int loopback)
{
unsigned int frag_len_left = skb_headlen(skb);
unsigned int len_left = skb->len - frag_len_left;
int eop = (len_left == 0);
unsigned int offset = 0;
unsigned int hdr_len;
dma_addr_t dma_addr;
unsigned int len;
skb_frag_t *frag;
if (skb->encapsulation) {
hdr_len = skb_inner_transport_header(skb) - skb->data;
hdr_len += inner_tcp_hdrlen(skb);
enic_preload_tcp_csum_encap(skb);
} else {
hdr_len = skb_transport_offset(skb) + tcp_hdrlen(skb);
enic_preload_tcp_csum(skb);
}
/* Queue WQ_ENET_MAX_DESC_LEN length descriptors
* for the main skb fragment
@ -666,6 +731,38 @@ static int enic_queue_wq_skb_tso(struct enic *enic, struct vnic_wq *wq,
return 0;
}
static inline int enic_queue_wq_skb_encap(struct enic *enic, struct vnic_wq *wq,
struct sk_buff *skb,
int vlan_tag_insert,
unsigned int vlan_tag, int loopback)
{
unsigned int head_len = skb_headlen(skb);
unsigned int len_left = skb->len - head_len;
/* Hardware will overwrite the checksum fields, calculating from
* scratch and ignoring the value placed by software.
* Offload mode = 00
* mss[2], mss[1], mss[0] bits are set
*/
unsigned int mss_or_csum = 7;
int eop = (len_left == 0);
dma_addr_t dma_addr;
int err = 0;
dma_addr = pci_map_single(enic->pdev, skb->data, head_len,
PCI_DMA_TODEVICE);
if (unlikely(enic_dma_map_check(enic, dma_addr)))
return -ENOMEM;
enic_queue_wq_desc_ex(wq, skb, dma_addr, head_len, mss_or_csum, 0,
vlan_tag_insert, vlan_tag,
WQ_ENET_OFFLOAD_MODE_CSUM, eop, 1 /* SOP */, eop,
loopback);
if (!eop)
err = enic_queue_wq_skb_cont(enic, wq, skb, len_left, loopback);
return err;
}
static inline void enic_queue_wq_skb(struct enic *enic,
struct vnic_wq *wq, struct sk_buff *skb)
{
@ -688,6 +785,9 @@ static inline void enic_queue_wq_skb(struct enic *enic,
err = enic_queue_wq_skb_tso(enic, wq, skb, mss,
vlan_tag_insert, vlan_tag,
loopback);
else if (skb->encapsulation)
err = enic_queue_wq_skb_encap(enic, wq, skb, vlan_tag_insert,
vlan_tag, loopback);
else if (skb->ip_summed == CHECKSUM_PARTIAL)
err = enic_queue_wq_skb_csum_l4(enic, wq, skb, vlan_tag_insert,
vlan_tag, loopback);
@ -2400,6 +2500,7 @@ static const struct net_device_ops enic_netdev_dynamic_ops = {
#endif
.ndo_udp_tunnel_add = enic_udp_tunnel_add,
.ndo_udp_tunnel_del = enic_udp_tunnel_del,
.ndo_features_check = enic_features_check,
};
static const struct net_device_ops enic_netdev_ops = {
@ -2425,6 +2526,7 @@ static const struct net_device_ops enic_netdev_ops = {
#endif
.ndo_udp_tunnel_add = enic_udp_tunnel_add,
.ndo_udp_tunnel_del = enic_udp_tunnel_del,
.ndo_features_check = enic_features_check,
};
static void enic_dev_deinit(struct enic *enic)