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vxlan: consolidate csum flag handling 

The flag for tx checksumming for tunneling over IPv4 and IPv6 is different.
Decide whether to do tx checksumming in vxlan_xmit_one and pass it on as
a separate flag. This will allow for tx path consolidation in the next
patch.

Unfortunately, gcc is not clever enough to see that udp_sum is always
initialized and gives an uninitialized variable warning. Set it to false to
silence the warning.

Signed-off-by: Jiri Benc <jbenc@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jiri Benc 2016-02-02 18:09:15 +01:00 committed by David S. Miller
parent 1a8496ba40
commit b4ed5cad24
1 changed files with 16 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

37
drivers/net/vxlan.c
View File

@ -1690,12 +1690,13 @@ static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
struct net_device *dev, struct in6_addr *saddr,
struct in6_addr *daddr, __u8 prio, __u8 ttl,
__be16 src_port, __be16 dst_port, __be32 vni,
struct vxlan_metadata *md, bool xnet, u32 vxflags)
struct vxlan_metadata *md, bool xnet, u32 vxflags,
bool udp_sum)
{
struct vxlanhdr *vxh;
int min_headroom;
int err;
bool udp_sum = !(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX);
bool nocheck = !udp_sum;
int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
u16 hdrlen = sizeof(struct vxlanhdr);
@ -1763,8 +1764,7 @@ static int vxlan6_xmit_skb(struct dst_entry *dst, struct sock *sk,
skb_set_inner_protocol(skb, htons(ETH_P_TEB));
udp_tunnel6_xmit_skb(dst, sk, skb, dev, saddr, daddr, prio,
ttl, src_port, dst_port,
!!(vxflags & VXLAN_F_UDP_ZERO_CSUM6_TX));
ttl, src_port, dst_port, nocheck);
return 0;
err:
dst_release(dst);
@ -1775,12 +1775,13 @@ err:
static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *skb,
__be32 src, __be32 dst, __u8 tos, __u8 ttl, __be16 df,
__be16 src_port, __be16 dst_port, __be32 vni,
struct vxlan_metadata *md, bool xnet, u32 vxflags)
struct vxlan_metadata *md, bool xnet, u32 vxflags,
bool udp_sum)
{
struct vxlanhdr *vxh;
int min_headroom;
int err;
bool udp_sum = !!(vxflags & VXLAN_F_UDP_CSUM);
bool nocheck = !udp_sum;
int type = udp_sum ? SKB_GSO_UDP_TUNNEL_CSUM : SKB_GSO_UDP_TUNNEL;
u16 hdrlen = sizeof(struct vxlanhdr);
@ -1842,8 +1843,7 @@ static int vxlan_xmit_skb(struct rtable *rt, struct sock *sk, struct sk_buff *sk
skb_set_inner_protocol(skb, htons(ETH_P_TEB));
udp_tunnel_xmit_skb(rt, sk, skb, src, dst, tos, ttl, df,
src_port, dst_port, xnet,
!(vxflags & VXLAN_F_UDP_CSUM));
src_port, dst_port, xnet, nocheck);
return 0;
}
@ -1959,6 +1959,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
__u8 tos, ttl;
int err;
u32 flags = vxlan->flags;
bool udp_sum = false;
info = skb_tunnel_info(skb);
@ -2007,6 +2008,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
if (info) {
ttl = info->key.ttl;
tos = info->key.tos;
udp_sum = !!(info->key.tun_flags & TUNNEL_CSUM);
if (info->options_len)
md = ip_tunnel_info_opts(info);
@ -2024,11 +2026,8 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
if (info) {
if (info->key.tun_flags & TUNNEL_DONT_FRAGMENT)
df = htons(IP_DF);
if (info->key.tun_flags & TUNNEL_CSUM)
flags |= VXLAN_F_UDP_CSUM;
else
flags &= ~VXLAN_F_UDP_CSUM;
} else {
udp_sum = !!(flags & VXLAN_F_UDP_CSUM);
}
rt = vxlan_get_route(vxlan, skb,
@ -2069,7 +2068,7 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
dst->sin.sin_addr.s_addr, tos, ttl, df,
src_port, dst_port, htonl(vni << 8), md,
!net_eq(vxlan->net, dev_net(vxlan->dev)),
flags);
flags, udp_sum);
if (err < 0) {
/* skb is already freed. */
skb = NULL;
@ -2119,18 +2118,14 @@ static void vxlan_xmit_one(struct sk_buff *skb, struct net_device *dev,
return;
}
if (info) {
if (info->key.tun_flags & TUNNEL_CSUM)
flags &= ~VXLAN_F_UDP_ZERO_CSUM6_TX;
else
flags |= VXLAN_F_UDP_ZERO_CSUM6_TX;
}
if (!info)
udp_sum = !(flags & VXLAN_F_UDP_ZERO_CSUM6_TX);
ttl = ttl ? : ip6_dst_hoplimit(ndst);
err = vxlan6_xmit_skb(ndst, sk, skb, dev, &saddr, &dst->sin6.sin6_addr,
0, ttl, src_port, dst_port, htonl(vni << 8), md,
!net_eq(vxlan->net, dev_net(vxlan->dev)),
flags);
flags, udp_sum);
#endif
}