fm10k: Add support for netdev offloads
This patch adds support for basic offloads including TSO, Tx checksum, Rx checksum, Rx hash, and the same features applied to VXLAN/NVGRE tunnels. Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Alexander Duyck
Jeff Kirsher
parent
aa3ac82268
commit
76a540d472
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@ -342,6 +342,59 @@ static struct sk_buff *fm10k_fetch_rx_buffer(struct fm10k_ring *rx_ring,
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return skb;
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}
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static inline void fm10k_rx_checksum(struct fm10k_ring *ring,
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union fm10k_rx_desc *rx_desc,
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struct sk_buff *skb)
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{
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skb_checksum_none_assert(skb);
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/* Rx checksum disabled via ethtool */
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if (!(ring->netdev->features & NETIF_F_RXCSUM))
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return;
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/* TCP/UDP checksum error bit is set */
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if (fm10k_test_staterr(rx_desc,
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FM10K_RXD_STATUS_L4E |
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FM10K_RXD_STATUS_L4E2 |
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FM10K_RXD_STATUS_IPE |
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FM10K_RXD_STATUS_IPE2)) {
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ring->rx_stats.csum_err++;
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return;
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}
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/* It must be a TCP or UDP packet with a valid checksum */
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if (fm10k_test_staterr(rx_desc, FM10K_RXD_STATUS_L4CS2))
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skb->encapsulation = true;
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else if (!fm10k_test_staterr(rx_desc, FM10K_RXD_STATUS_L4CS))
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return;
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skb->ip_summed = CHECKSUM_UNNECESSARY;
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}
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#define FM10K_RSS_L4_TYPES_MASK \
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((1ul << FM10K_RSSTYPE_IPV4_TCP) | \
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(1ul << FM10K_RSSTYPE_IPV4_UDP) | \
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(1ul << FM10K_RSSTYPE_IPV6_TCP) | \
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(1ul << FM10K_RSSTYPE_IPV6_UDP))
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static inline void fm10k_rx_hash(struct fm10k_ring *ring,
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union fm10k_rx_desc *rx_desc,
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struct sk_buff *skb)
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{
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u16 rss_type;
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if (!(ring->netdev->features & NETIF_F_RXHASH))
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return;
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rss_type = le16_to_cpu(rx_desc->w.pkt_info) & FM10K_RXD_RSSTYPE_MASK;
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if (!rss_type)
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return;
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skb_set_hash(skb, le32_to_cpu(rx_desc->d.rss),
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(FM10K_RSS_L4_TYPES_MASK & (1ul << rss_type)) ?
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PKT_HASH_TYPE_L4 : PKT_HASH_TYPE_L3);
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}
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/**
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* fm10k_process_skb_fields - Populate skb header fields from Rx descriptor
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* @rx_ring: rx descriptor ring packet is being transacted on
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@ -358,6 +411,10 @@ static unsigned int fm10k_process_skb_fields(struct fm10k_ring *rx_ring,
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{
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unsigned int len = skb->len;
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fm10k_rx_hash(rx_ring, rx_desc, skb);
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fm10k_rx_checksum(rx_ring, rx_desc, skb);
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FM10K_CB(skb)->fi.w.vlan = rx_desc->w.vlan;
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skb_record_rx_queue(skb, rx_ring->queue_index);
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@ -569,6 +626,240 @@ static bool fm10k_clean_rx_irq(struct fm10k_q_vector *q_vector,
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return total_packets < budget;
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}
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#define VXLAN_HLEN (sizeof(struct udphdr) + 8)
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static struct ethhdr *fm10k_port_is_vxlan(struct sk_buff *skb)
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{
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struct fm10k_intfc *interface = netdev_priv(skb->dev);
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struct fm10k_vxlan_port *vxlan_port;
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/* we can only offload a vxlan if we recognize it as such */
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vxlan_port = list_first_entry_or_null(&interface->vxlan_port,
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struct fm10k_vxlan_port, list);
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if (!vxlan_port)
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return NULL;
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if (vxlan_port->port != udp_hdr(skb)->dest)
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return NULL;
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/* return offset of udp_hdr plus 8 bytes for VXLAN header */
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return (struct ethhdr *)(skb_transport_header(skb) + VXLAN_HLEN);
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}
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#define FM10K_NVGRE_RESERVED0_FLAGS htons(0x9FFF)
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#define NVGRE_TNI htons(0x2000)
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struct fm10k_nvgre_hdr {
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__be16 flags;
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__be16 proto;
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__be32 tni;
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};
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static struct ethhdr *fm10k_gre_is_nvgre(struct sk_buff *skb)
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{
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struct fm10k_nvgre_hdr *nvgre_hdr;
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int hlen = ip_hdrlen(skb);
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/* currently only IPv4 is supported due to hlen above */
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if (vlan_get_protocol(skb) != htons(ETH_P_IP))
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return NULL;
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/* our transport header should be NVGRE */
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nvgre_hdr = (struct fm10k_nvgre_hdr *)(skb_network_header(skb) + hlen);
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/* verify all reserved flags are 0 */
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if (nvgre_hdr->flags & FM10K_NVGRE_RESERVED0_FLAGS)
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return NULL;
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/* verify protocol is transparent Ethernet bridging */
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if (nvgre_hdr->proto != htons(ETH_P_TEB))
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return NULL;
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/* report start of ethernet header */
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if (nvgre_hdr->flags & NVGRE_TNI)
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return (struct ethhdr *)(nvgre_hdr + 1);
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return (struct ethhdr *)(&nvgre_hdr->tni);
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}
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static __be16 fm10k_tx_encap_offload(struct sk_buff *skb)
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{
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struct ethhdr *eth_hdr;
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u8 l4_hdr = 0;
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switch (vlan_get_protocol(skb)) {
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case htons(ETH_P_IP):
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l4_hdr = ip_hdr(skb)->protocol;
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break;
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case htons(ETH_P_IPV6):
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l4_hdr = ipv6_hdr(skb)->nexthdr;
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break;
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default:
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return 0;
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}
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switch (l4_hdr) {
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case IPPROTO_UDP:
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eth_hdr = fm10k_port_is_vxlan(skb);
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break;
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case IPPROTO_GRE:
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eth_hdr = fm10k_gre_is_nvgre(skb);
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break;
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default:
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return 0;
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}
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if (!eth_hdr)
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return 0;
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switch (eth_hdr->h_proto) {
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case htons(ETH_P_IP):
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case htons(ETH_P_IPV6):
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break;
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default:
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return 0;
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}
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return eth_hdr->h_proto;
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}
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static int fm10k_tso(struct fm10k_ring *tx_ring,
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struct fm10k_tx_buffer *first)
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{
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struct sk_buff *skb = first->skb;
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struct fm10k_tx_desc *tx_desc;
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unsigned char *th;
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u8 hdrlen;
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if (skb->ip_summed != CHECKSUM_PARTIAL)
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return 0;
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if (!skb_is_gso(skb))
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return 0;
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/* compute header lengths */
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if (skb->encapsulation) {
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if (!fm10k_tx_encap_offload(skb))
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goto err_vxlan;
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th = skb_inner_transport_header(skb);
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} else {
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th = skb_transport_header(skb);
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}
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/* compute offset from SOF to transport header and add header len */
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hdrlen = (th - skb->data) + (((struct tcphdr *)th)->doff << 2);
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first->tx_flags |= FM10K_TX_FLAGS_CSUM;
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/* update gso size and bytecount with header size */
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first->gso_segs = skb_shinfo(skb)->gso_segs;
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first->bytecount += (first->gso_segs - 1) * hdrlen;
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/* populate Tx descriptor header size and mss */
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tx_desc = FM10K_TX_DESC(tx_ring, tx_ring->next_to_use);
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tx_desc->hdrlen = hdrlen;
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tx_desc->mss = cpu_to_le16(skb_shinfo(skb)->gso_size);
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return 1;
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err_vxlan:
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tx_ring->netdev->features &= ~NETIF_F_GSO_UDP_TUNNEL;
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if (!net_ratelimit())
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netdev_err(tx_ring->netdev,
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"TSO requested for unsupported tunnel, disabling offload\n");
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return -1;
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}
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static void fm10k_tx_csum(struct fm10k_ring *tx_ring,
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struct fm10k_tx_buffer *first)
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{
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struct sk_buff *skb = first->skb;
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struct fm10k_tx_desc *tx_desc;
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union {
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struct iphdr *ipv4;
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struct ipv6hdr *ipv6;
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u8 *raw;
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} network_hdr;
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__be16 protocol;
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u8 l4_hdr = 0;
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if (skb->ip_summed != CHECKSUM_PARTIAL)
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goto no_csum;
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if (skb->encapsulation) {
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protocol = fm10k_tx_encap_offload(skb);
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if (!protocol) {
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if (skb_checksum_help(skb)) {
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dev_warn(tx_ring->dev,
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"failed to offload encap csum!\n");
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tx_ring->tx_stats.csum_err++;
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}
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goto no_csum;
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}
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network_hdr.raw = skb_inner_network_header(skb);
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} else {
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protocol = vlan_get_protocol(skb);
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network_hdr.raw = skb_network_header(skb);
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}
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switch (protocol) {
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case htons(ETH_P_IP):
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l4_hdr = network_hdr.ipv4->protocol;
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break;
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case htons(ETH_P_IPV6):
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l4_hdr = network_hdr.ipv6->nexthdr;
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break;
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default:
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if (unlikely(net_ratelimit())) {
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dev_warn(tx_ring->dev,
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"partial checksum but ip version=%x!\n",
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protocol);
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}
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tx_ring->tx_stats.csum_err++;
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goto no_csum;
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}
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switch (l4_hdr) {
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case IPPROTO_TCP:
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case IPPROTO_UDP:
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break;
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case IPPROTO_GRE:
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if (skb->encapsulation)
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break;
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default:
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if (unlikely(net_ratelimit())) {
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dev_warn(tx_ring->dev,
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"partial checksum but l4 proto=%x!\n",
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l4_hdr);
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}
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tx_ring->tx_stats.csum_err++;
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goto no_csum;
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}
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/* update TX checksum flag */
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first->tx_flags |= FM10K_TX_FLAGS_CSUM;
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no_csum:
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/* populate Tx descriptor header size and mss */
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tx_desc = FM10K_TX_DESC(tx_ring, tx_ring->next_to_use);
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tx_desc->hdrlen = 0;
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tx_desc->mss = 0;
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}
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#define FM10K_SET_FLAG(_input, _flag, _result) \
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((_flag <= _result) ? \
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((u32)(_input & _flag) * (_result / _flag)) : \
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((u32)(_input & _flag) / (_flag / _result)))
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static u8 fm10k_tx_desc_flags(struct sk_buff *skb, u32 tx_flags)
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{
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/* set type for advanced descriptor with frame checksum insertion */
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u32 desc_flags = 0;
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/* set checksum offload bits */
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desc_flags |= FM10K_SET_FLAG(tx_flags, FM10K_TX_FLAGS_CSUM,
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FM10K_TXD_FLAG_CSUM);
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return desc_flags;
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}
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static bool fm10k_tx_desc_push(struct fm10k_ring *tx_ring,
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struct fm10k_tx_desc *tx_desc, u16 i,
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dma_addr_t dma, unsigned int size, u8 desc_flags)
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@ -596,8 +887,9 @@ static void fm10k_tx_map(struct fm10k_ring *tx_ring,
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unsigned char *data;
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dma_addr_t dma;
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unsigned int data_len, size;
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u32 tx_flags = first->tx_flags;
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u16 i = tx_ring->next_to_use;
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u8 flags = 0;
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u8 flags = fm10k_tx_desc_flags(skb, tx_flags);
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tx_desc = FM10K_TX_DESC(tx_ring, i);
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@ -732,6 +1024,7 @@ netdev_tx_t fm10k_xmit_frame_ring(struct sk_buff *skb,
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struct fm10k_ring *tx_ring)
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{
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struct fm10k_tx_buffer *first;
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int tso;
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u32 tx_flags = 0;
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#if PAGE_SIZE > FM10K_MAX_DATA_PER_TXD
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unsigned short f;
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@ -763,10 +1056,22 @@ netdev_tx_t fm10k_xmit_frame_ring(struct sk_buff *skb,
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/* record initial flags and protocol */
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first->tx_flags = tx_flags;
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tso = fm10k_tso(tx_ring, first);
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if (tso < 0)
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goto out_drop;
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else if (!tso)
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fm10k_tx_csum(tx_ring, first);
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fm10k_tx_map(tx_ring, first);
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fm10k_maybe_stop_tx(tx_ring, DESC_NEEDED);
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return NETDEV_TX_OK;
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out_drop:
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dev_kfree_skb_any(first->skb);
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first->skb = NULL;
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return NETDEV_TX_OK;
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}
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@ -20,6 +20,9 @@
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#include "fm10k.h"
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#include <linux/vmalloc.h>
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#if IS_ENABLED(CONFIG_VXLAN)
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#include <net/vxlan.h>
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#endif /* CONFIG_VXLAN */
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/**
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* fm10k_setup_tx_resources - allocate Tx resources (Descriptors)
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@ -368,6 +371,128 @@ static void fm10k_request_glort_range(struct fm10k_intfc *interface)
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interface->glort_count = mask + 1;
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}
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/**
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* fm10k_del_vxlan_port_all
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* @interface: board private structure
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*
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* This function frees the entire vxlan_port list
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**/
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static void fm10k_del_vxlan_port_all(struct fm10k_intfc *interface)
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{
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struct fm10k_vxlan_port *vxlan_port;
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/* flush all entries from list */
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vxlan_port = list_first_entry_or_null(&interface->vxlan_port,
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struct fm10k_vxlan_port, list);
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while (vxlan_port) {
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list_del(&vxlan_port->list);
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kfree(vxlan_port);
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vxlan_port = list_first_entry_or_null(&interface->vxlan_port,
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struct fm10k_vxlan_port,
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list);
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}
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}
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/**
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* fm10k_restore_vxlan_port
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* @interface: board private structure
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*
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* This function restores the value in the tunnel_cfg register after reset
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**/
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static void fm10k_restore_vxlan_port(struct fm10k_intfc *interface)
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{
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struct fm10k_hw *hw = &interface->hw;
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struct fm10k_vxlan_port *vxlan_port;
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/* only the PF supports configuring tunnels */
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if (hw->mac.type != fm10k_mac_pf)
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return;
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vxlan_port = list_first_entry_or_null(&interface->vxlan_port,
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struct fm10k_vxlan_port, list);
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/* restore tunnel configuration register */
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fm10k_write_reg(hw, FM10K_TUNNEL_CFG,
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(vxlan_port ? ntohs(vxlan_port->port) : 0) |
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(ETH_P_TEB << FM10K_TUNNEL_CFG_NVGRE_SHIFT));
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}
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/**
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* fm10k_add_vxlan_port
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* @netdev: network interface device structure
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* @sa_family: Address family of new port
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* @port: port number used for VXLAN
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*
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* This funciton is called when a new VXLAN interface has added a new port
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* number to the range that is currently in use for VXLAN. The new port
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* number is always added to the tail so that the port number list should
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* match the order in which the ports were allocated. The head of the list
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* is always used as the VXLAN port number for offloads.
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**/
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static void fm10k_add_vxlan_port(struct net_device *dev,
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sa_family_t sa_family, __be16 port) {
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struct fm10k_intfc *interface = netdev_priv(dev);
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struct fm10k_vxlan_port *vxlan_port;
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/* only the PF supports configuring tunnels */
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if (interface->hw.mac.type != fm10k_mac_pf)
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return;
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/* existing ports are pulled out so our new entry is always last */
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fm10k_vxlan_port_for_each(vxlan_port, interface) {
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if ((vxlan_port->port == port) &&
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(vxlan_port->sa_family == sa_family)) {
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list_del(&vxlan_port->list);
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goto insert_tail;
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}
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}
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/* allocate memory to track ports */
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vxlan_port = kmalloc(sizeof(*vxlan_port), GFP_ATOMIC);
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if (!vxlan_port)
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return;
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vxlan_port->port = port;
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vxlan_port->sa_family = sa_family;
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insert_tail:
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/* add new port value to list */
|
||||
list_add_tail(&vxlan_port->list, &interface->vxlan_port);
|
||||
|
||||
fm10k_restore_vxlan_port(interface);
|
||||
}
|
||||
|
||||
/**
|
||||
* fm10k_del_vxlan_port
|
||||
* @netdev: network interface device structure
|
||||
* @sa_family: Address family of freed port
|
||||
* @port: port number used for VXLAN
|
||||
*
|
||||
* This funciton is called when a new VXLAN interface has freed a port
|
||||
* number from the range that is currently in use for VXLAN. The freed
|
||||
* port is removed from the list and the new head is used to determine
|
||||
* the port number for offloads.
|
||||
**/
|
||||
static void fm10k_del_vxlan_port(struct net_device *dev,
|
||||
sa_family_t sa_family, __be16 port) {
|
||||
struct fm10k_intfc *interface = netdev_priv(dev);
|
||||
struct fm10k_vxlan_port *vxlan_port;
|
||||
|
||||
if (interface->hw.mac.type != fm10k_mac_pf)
|
||||
return;
|
||||
|
||||
/* find the port in the list and free it */
|
||||
fm10k_vxlan_port_for_each(vxlan_port, interface) {
|
||||
if ((vxlan_port->port == port) &&
|
||||
(vxlan_port->sa_family == sa_family)) {
|
||||
list_del(&vxlan_port->list);
|
||||
kfree(vxlan_port);
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
fm10k_restore_vxlan_port(interface);
|
||||
}
|
||||
|
||||
/**
|
||||
* fm10k_open - Called when a network interface is made active
|
||||
* @netdev: network interface device structure
|
||||
|
|
@ -410,6 +535,11 @@ int fm10k_open(struct net_device *netdev)
|
|||
if (err)
|
||||
goto err_set_queues;
|
||||
|
||||
#if IS_ENABLED(CONFIG_VXLAN)
|
||||
/* update VXLAN port configuration */
|
||||
vxlan_get_rx_port(netdev);
|
||||
|
||||
#endif
|
||||
fm10k_up(interface);
|
||||
|
||||
return 0;
|
||||
|
|
@ -443,6 +573,8 @@ int fm10k_close(struct net_device *netdev)
|
|||
|
||||
fm10k_qv_free_irq(interface);
|
||||
|
||||
fm10k_del_vxlan_port_all(interface);
|
||||
|
||||
fm10k_free_all_tx_resources(interface);
|
||||
fm10k_free_all_rx_resources(interface);
|
||||
|
||||
|
|
@ -892,6 +1024,9 @@ void fm10k_restore_rx_state(struct fm10k_intfc *interface)
|
|||
|
||||
/* record updated xcast mode state */
|
||||
interface->xcast_mode = xcast_mode;
|
||||
|
||||
/* Restore tunnel configuration */
|
||||
fm10k_restore_vxlan_port(interface);
|
||||
}
|
||||
|
||||
void fm10k_reset_rx_state(struct fm10k_intfc *interface)
|
||||
|
|
@ -1026,6 +1161,8 @@ static const struct net_device_ops fm10k_netdev_ops = {
|
|||
.ndo_set_rx_mode = fm10k_set_rx_mode,
|
||||
.ndo_get_stats64 = fm10k_get_stats64,
|
||||
.ndo_setup_tc = fm10k_setup_tc,
|
||||
.ndo_add_vxlan_port = fm10k_add_vxlan_port,
|
||||
.ndo_del_vxlan_port = fm10k_del_vxlan_port,
|
||||
};
|
||||
|
||||
#define DEFAULT_DEBUG_LEVEL_SHIFT 3
|
||||
|
|
@ -1048,7 +1185,15 @@ struct net_device *fm10k_alloc_netdev(void)
|
|||
interface->msg_enable = (1 << DEFAULT_DEBUG_LEVEL_SHIFT) - 1;
|
||||
|
||||
/* configure default features */
|
||||
dev->features |= NETIF_F_SG;
|
||||
dev->features |= NETIF_F_IP_CSUM |
|
||||
NETIF_F_IPV6_CSUM |
|
||||
NETIF_F_SG |
|
||||
NETIF_F_TSO |
|
||||
NETIF_F_TSO6 |
|
||||
NETIF_F_TSO_ECN |
|
||||
NETIF_F_GSO_UDP_TUNNEL |
|
||||
NETIF_F_RXHASH |
|
||||
NETIF_F_RXCSUM;
|
||||
|
||||
/* all features defined to this point should be changeable */
|
||||
dev->hw_features |= dev->features;
|
||||
|
|
@ -1057,7 +1202,13 @@ struct net_device *fm10k_alloc_netdev(void)
|
|||
dev->vlan_features |= dev->features;
|
||||
|
||||
/* configure tunnel offloads */
|
||||
dev->hw_enc_features = NETIF_F_SG;
|
||||
dev->hw_enc_features = NETIF_F_IP_CSUM |
|
||||
NETIF_F_TSO |
|
||||
NETIF_F_TSO6 |
|
||||
NETIF_F_TSO_ECN |
|
||||
NETIF_F_GSO_UDP_TUNNEL |
|
||||
NETIF_F_IPV6_CSUM |
|
||||
NETIF_F_SG;
|
||||
|
||||
/* we want to leave these both on as we cannot disable VLAN tag
|
||||
* insertion or stripping on the hardware since it is contained
|
||||
|
|
|
|||
Loading…
Reference in New Issue