diff options
Diffstat (limited to 'include/net')
| -rw-r--r-- | include/net/inet_sock.h | 2 | ||||
| -rw-r--r-- | include/net/ip.h | 15 |
2 files changed, 14 insertions, 3 deletions
diff --git a/include/net/inet_sock.h b/include/net/inet_sock.h index 0bb32bfc6183..491ceb7ebe5d 100644 --- a/include/net/inet_sock.h +++ b/include/net/inet_sock.h @@ -222,8 +222,8 @@ struct inet_sock { __s16 uc_ttl; __u16 cmsg_flags; struct ip_options_rcu __rcu *inet_opt; + atomic_t inet_id; __be16 inet_sport; - __u16 inet_id; __u8 tos; __u8 min_ttl; diff --git a/include/net/ip.h b/include/net/ip.h index 332521170d9b..19adacd5ece0 100644 --- a/include/net/ip.h +++ b/include/net/ip.h @@ -538,8 +538,19 @@ static inline void ip_select_ident_segs(struct net *net, struct sk_buff *skb, * generator as much as we can. */ if (sk && inet_sk(sk)->inet_daddr) { - iph->id = htons(inet_sk(sk)->inet_id); - inet_sk(sk)->inet_id += segs; + int val; + + /* avoid atomic operations for TCP, + * as we hold socket lock at this point. + */ + if (sk_is_tcp(sk)) { + sock_owned_by_me(sk); + val = atomic_read(&inet_sk(sk)->inet_id); + atomic_set(&inet_sk(sk)->inet_id, val + segs); + } else { + val = atomic_add_return(segs, &inet_sk(sk)->inet_id); + } + iph->id = htons(val); return; } if ((iph->frag_off & htons(IP_DF)) && !skb->ignore_df) { |