From 9b174d88c257150562b0101fcc6cb6c3cb74275c Mon Sep 17 00:00:00 2001 From: Jesse Gross Date: Tue, 30 Dec 2014 19:10:15 -0800 Subject: net: Add Transparent Ethernet Bridging GRO support. Currently the only tunnel protocol that supports GRO with encapsulated Ethernet is VXLAN. This pulls out the Ethernet code into a proper layer so that it can be used by other tunnel protocols such as GRE and Geneve. Signed-off-by: Jesse Gross Signed-off-by: David S. Miller --- net/ethernet/eth.c | 92 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 92 insertions(+) (limited to 'net/ethernet') diff --git a/net/ethernet/eth.c b/net/ethernet/eth.c index 33a140e15834..238f38d21641 100644 --- a/net/ethernet/eth.c +++ b/net/ethernet/eth.c @@ -424,3 +424,95 @@ ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len) return scnprintf(buf, PAGE_SIZE, "%*phC\n", len, addr); } EXPORT_SYMBOL(sysfs_format_mac); + +struct sk_buff **eth_gro_receive(struct sk_buff **head, + struct sk_buff *skb) +{ + struct sk_buff *p, **pp = NULL; + struct ethhdr *eh, *eh2; + unsigned int hlen, off_eth; + const struct packet_offload *ptype; + __be16 type; + int flush = 1; + + off_eth = skb_gro_offset(skb); + hlen = off_eth + sizeof(*eh); + eh = skb_gro_header_fast(skb, off_eth); + if (skb_gro_header_hard(skb, hlen)) { + eh = skb_gro_header_slow(skb, hlen, off_eth); + if (unlikely(!eh)) + goto out; + } + + flush = 0; + + for (p = *head; p; p = p->next) { + if (!NAPI_GRO_CB(p)->same_flow) + continue; + + eh2 = (struct ethhdr *)(p->data + off_eth); + if (compare_ether_header(eh, eh2)) { + NAPI_GRO_CB(p)->same_flow = 0; + continue; + } + } + + type = eh->h_proto; + + rcu_read_lock(); + ptype = gro_find_receive_by_type(type); + if (ptype == NULL) { + flush = 1; + goto out_unlock; + } + + skb_gro_pull(skb, sizeof(*eh)); + skb_gro_postpull_rcsum(skb, eh, sizeof(*eh)); + pp = ptype->callbacks.gro_receive(head, skb); + +out_unlock: + rcu_read_unlock(); +out: + NAPI_GRO_CB(skb)->flush |= flush; + + return pp; +} +EXPORT_SYMBOL(eth_gro_receive); + +int eth_gro_complete(struct sk_buff *skb, int nhoff) +{ + struct ethhdr *eh = (struct ethhdr *)(skb->data + nhoff); + __be16 type = eh->h_proto; + struct packet_offload *ptype; + int err = -ENOSYS; + + if (skb->encapsulation) + skb_set_inner_mac_header(skb, nhoff); + + rcu_read_lock(); + ptype = gro_find_complete_by_type(type); + if (ptype != NULL) + err = ptype->callbacks.gro_complete(skb, nhoff + + sizeof(struct ethhdr)); + + rcu_read_unlock(); + return err; +} +EXPORT_SYMBOL(eth_gro_complete); + +static struct packet_offload eth_packet_offload __read_mostly = { + .type = cpu_to_be16(ETH_P_TEB), + .callbacks = { + .gro_receive = eth_gro_receive, + .gro_complete = eth_gro_complete, + }, +}; + +static int __init eth_offload_init(void) +{ + dev_add_offload(ð_packet_offload); + + return 0; +} + +fs_initcall(eth_offload_init); -- cgit v1.2.3