diff options
Diffstat (limited to 'drivers/net/ethernet/cisco/enic/enic_main.c')
| -rw-r--r-- | drivers/net/ethernet/cisco/enic/enic_main.c | 126 |
1 files changed, 114 insertions, 12 deletions
diff --git a/drivers/net/ethernet/cisco/enic/enic_main.c b/drivers/net/ethernet/cisco/enic/enic_main.c index 7e56bf95cfc7..4b87beeabce1 100644 --- a/drivers/net/ethernet/cisco/enic/enic_main.c +++ b/drivers/net/ethernet/cisco/enic/enic_main.c @@ -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) |
