From 66e5133f19e901a044fa5eaeeb6ecff4545839e5 Mon Sep 17 00:00:00 2001 From: Toshiaki Makita Date: Mon, 1 Jun 2015 21:55:06 +0900 Subject: 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 Signed-off-by: David S. Miller --- include/linux/if_vlan.h | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'include/linux/if_vlan.h') diff --git a/include/linux/if_vlan.h b/include/linux/if_vlan.h index a40d29846ac2..67ce5bd3b56a 100644 --- a/include/linux/if_vlan.h +++ b/include/linux/if_vlan.h @@ -628,4 +628,24 @@ static inline netdev_features_t vlan_features_check(const struct sk_buff *skb, return features; } +/** + * compare_vlan_header - Compare two vlan headers + * @h1: Pointer to vlan header + * @h2: Pointer to vlan header + * + * Compare two vlan headers, returns 0 if equal. + * + * Please note that alignment of h1 & h2 are only guaranteed to be 16 bits. + */ +static inline unsigned long compare_vlan_header(const struct vlan_hdr *h1, + const struct vlan_hdr *h2) +{ +#if defined(CONFIG_HAVE_EFFICIENT_UNALIGNED_ACCESS) + return *(u32 *)h1 ^ *(u32 *)h2; +#else + return ((__force u32)h1->h_vlan_TCI ^ (__force u32)h2->h_vlan_TCI) | + ((__force u32)h1->h_vlan_encapsulated_proto ^ + (__force u32)h2->h_vlan_encapsulated_proto); +#endif +} #endif /* !(_LINUX_IF_VLAN_H_) */ -- cgit v1.2.3-59-g8ed1b