vlan: Add GRO support for non hardware accelerated vlan
Currently packets with non-hardware-accelerated vlan cannot be handled by GRO. This causes low performance for 802.1ad and stacked vlan, as their vlan tags are currently not stripped by hardware. This patch adds GRO support for non-hardware-accelerated vlan and improves receive performance of them. Test Environment: vlan device (.1Q) on vlan device (.1ad) on ixgbe (82599) Result: - Before $ netperf -t TCP_STREAM -H 192.168.20.2 -l 60 Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 60.00 5233.17 Rx side CPU usage: %usr %sys %irq %soft %idle 0.27 58.03 0.00 41.70 0.00 - After $ netperf -t TCP_STREAM -H 192.168.20.2 -l 60 Recv Send Send Socket Socket Message Elapsed Size Size Size Time Throughput bytes bytes bytes secs. 10^6bits/sec 87380 16384 16384 60.00 7586.85 Rx side CPU usage: %usr %sys %irq %soft %idle 0.50 25.83 0.00 59.53 14.14 [ Register VLAN offloads with priority 10 -DaveM ] Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp> Signed-off-by: David S. Miller <davem@davemloft.net>steinar/wifi_calib_4_9_kernel
Toshiaki Makita
David S. Miller
parent
661b689bbd
commit
66e5133f19
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@ -628,4 +628,24 @@ static inline netdev_features_t vlan_features_check(const struct sk_buff *skb,
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return features;
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}
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/**
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* compare_vlan_header - Compare two vlan headers
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* @h1: Pointer to vlan header
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* @h2: Pointer to vlan header
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*
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* Compare two vlan headers, returns 0 if equal.
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*
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* Please note that alignment of h1 & h2 are only guaranteed to be 16 bits.
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*/
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static inline unsigned long compare_vlan_header(const struct vlan_hdr *h1,
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const struct vlan_hdr *h2)
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{
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#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS)
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return *(u32 *)h1 ^ *(u32 *)h2;
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#else
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return ((__force u32)h1->h_vlan_TCI ^ (__force u32)h2->h_vlan_TCI) |
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((__force u32)h1->h_vlan_encapsulated_proto ^
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(__force u32)h2->h_vlan_encapsulated_proto);
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#endif
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}
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#endif /* !(_LINUX_IF_VLAN_H_) */
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@ -618,6 +618,92 @@ out:
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return err;
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}
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static struct sk_buff **vlan_gro_receive(struct sk_buff **head,
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struct sk_buff *skb)
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{
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struct sk_buff *p, **pp = NULL;
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struct vlan_hdr *vhdr;
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unsigned int hlen, off_vlan;
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const struct packet_offload *ptype;
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__be16 type;
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int flush = 1;
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off_vlan = skb_gro_offset(skb);
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hlen = off_vlan + sizeof(*vhdr);
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vhdr = skb_gro_header_fast(skb, off_vlan);
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if (skb_gro_header_hard(skb, hlen)) {
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vhdr = skb_gro_header_slow(skb, hlen, off_vlan);
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if (unlikely(!vhdr))
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goto out;
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}
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type = vhdr->h_vlan_encapsulated_proto;
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rcu_read_lock();
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ptype = gro_find_receive_by_type(type);
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if (!ptype)
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goto out_unlock;
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flush = 0;
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for (p = *head; p; p = p->next) {
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struct vlan_hdr *vhdr2;
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if (!NAPI_GRO_CB(p)->same_flow)
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continue;
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vhdr2 = (struct vlan_hdr *)(p->data + off_vlan);
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if (compare_vlan_header(vhdr, vhdr2))
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NAPI_GRO_CB(p)->same_flow = 0;
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}
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skb_gro_pull(skb, sizeof(*vhdr));
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skb_gro_postpull_rcsum(skb, vhdr, sizeof(*vhdr));
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pp = ptype->callbacks.gro_receive(head, skb);
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out_unlock:
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rcu_read_unlock();
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out:
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NAPI_GRO_CB(skb)->flush |= flush;
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return pp;
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}
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static int vlan_gro_complete(struct sk_buff *skb, int nhoff)
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{
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struct vlan_hdr *vhdr = (struct vlan_hdr *)(skb->data + nhoff);
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__be16 type = vhdr->h_vlan_encapsulated_proto;
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struct packet_offload *ptype;
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int err = -ENOENT;
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rcu_read_lock();
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ptype = gro_find_complete_by_type(type);
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if (ptype)
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err = ptype->callbacks.gro_complete(skb, nhoff + sizeof(*vhdr));
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rcu_read_unlock();
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return err;
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}
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static struct packet_offload vlan_packet_offloads[] __read_mostly = {
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{
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.type = cpu_to_be16(ETH_P_8021Q),
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.priority = 10,
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.callbacks = {
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.gro_receive = vlan_gro_receive,
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.gro_complete = vlan_gro_complete,
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},
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},
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{
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.type = cpu_to_be16(ETH_P_8021AD),
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.priority = 10,
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.callbacks = {
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.gro_receive = vlan_gro_receive,
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.gro_complete = vlan_gro_complete,
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},
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},
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};
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static int __net_init vlan_init_net(struct net *net)
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{
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struct vlan_net *vn = net_generic(net, vlan_net_id);
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@ -645,6 +731,7 @@ static struct pernet_operations vlan_net_ops = {
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static int __init vlan_proto_init(void)
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{
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int err;
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unsigned int i;
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pr_info("%s v%s\n", vlan_fullname, vlan_version);
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@ -668,6 +755,9 @@ static int __init vlan_proto_init(void)
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if (err < 0)
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goto err5;
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for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++)
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dev_add_offload(&vlan_packet_offloads[i]);
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vlan_ioctl_set(vlan_ioctl_handler);
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return 0;
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@ -685,7 +775,13 @@ err0:
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static void __exit vlan_cleanup_module(void)
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{
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unsigned int i;
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vlan_ioctl_set(NULL);
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for (i = 0; i < ARRAY_SIZE(vlan_packet_offloads); i++)
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dev_remove_offload(&vlan_packet_offloads[i]);
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vlan_netlink_fini();
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unregister_netdevice_notifier(&vlan_notifier_block);
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