[PATCH v5 net-next 2/8] net: udp: always set up for CHECKSUM_PARTIAL offload
From: Edward Cree <hidden>
Date: 2016-02-11 20:49:54
Subsystem:
networking [general], networking [ipv4/ipv6], the rest, user datagram protocol (udp) · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, David Ahern, Ido Schimmel, Linus Torvalds, Willem de Bruijn
If the dst device doesn't support it, it'll get fixed up later anyway by validate_xmit_skb(). Also, this allows us to take advantage of LCO to avoid summing the payload multiple times. Signed-off-by: Edward Cree <redacted> --- net/ipv4/udp.c | 14 +------------- net/ipv6/ip6_checksum.c | 13 +------------ 2 files changed, 2 insertions(+), 25 deletions(-)
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index a59341c..9fc4e9c 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c@@ -857,23 +857,11 @@ void udp_set_csum(bool nocheck, struct sk_buff *skb, uh->check = udp_v4_check(len, saddr, daddr, lco_csum(skb)); if (uh->check == 0) uh->check = CSUM_MANGLED_0; - } else if (skb_dst(skb) && skb_dst(skb)->dev && - (skb_dst(skb)->dev->features & - (NETIF_F_IP_CSUM | NETIF_F_HW_CSUM))) { + } else { skb->ip_summed = CHECKSUM_PARTIAL; skb->csum_start = skb_transport_header(skb) - skb->head; skb->csum_offset = offsetof(struct udphdr, check); uh->check = ~udp_v4_check(len, saddr, daddr, 0); - } else { - __wsum csum; - - uh->check = 0; - csum = skb_checksum(skb, 0, len, 0); - uh->check = udp_v4_check(len, saddr, daddr, csum); - if (uh->check == 0) - uh->check = CSUM_MANGLED_0; - - skb->ip_summed = CHECKSUM_UNNECESSARY; } } EXPORT_SYMBOL(udp_set_csum);
diff --git a/net/ipv6/ip6_checksum.c b/net/ipv6/ip6_checksum.c
index 4924bd7..8f92058 100644
--- a/net/ipv6/ip6_checksum.c
+++ b/net/ipv6/ip6_checksum.c@@ -103,22 +103,11 @@ void udp6_set_csum(bool nocheck, struct sk_buff *skb, uh->check = udp_v6_check(len, saddr, daddr, lco_csum(skb)); if (uh->check == 0) uh->check = CSUM_MANGLED_0; - } else if (skb_dst(skb) && skb_dst(skb)->dev && - (skb_dst(skb)->dev->features & NETIF_F_IPV6_CSUM)) { + } else { skb->ip_summed = CHECKSUM_PARTIAL; skb->csum_start = skb_transport_header(skb) - skb->head; skb->csum_offset = offsetof(struct udphdr, check); uh->check = ~udp_v6_check(len, saddr, daddr, 0); - } else { - __wsum csum; - - uh->check = 0; - csum = skb_checksum(skb, 0, len, 0); - uh->check = udp_v6_check(len, saddr, daddr, csum); - if (uh->check == 0) - uh->check = CSUM_MANGLED_0; - - skb->ip_summed = CHECKSUM_UNNECESSARY; } } EXPORT_SYMBOL(udp6_set_csum);