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inet: add rsk_listener field to struct request_sock 

Once we'll be able to lookup request sockets in ehash table,
we'll need to get access to listener which created this request.

This avoid doing a lookup to find the listener, which benefits
for a more solid SO_REUSEPORT, and is needed once we no
longer queue request sock into a listener private queue.

Note that 'struct tcp_request_sock'->listener could be reduced
to a single bit, as TFO listener should match req->rsk_listener.
TFO will no longer need to hold a reference on the listener.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-03-17 18:32:28 -07:00 committed by David S. Miller
parent e49bb337d7
commit 4e9a578e5b
2 changed files with 10 additions and 4 deletions
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12
include/net/request_sock.h
View File

@ -52,6 +52,7 @@ struct request_sock {
#define rsk_refcnt __req_common.skc_refcnt
struct request_sock *dl_next;
struct sock *rsk_listener;
u16 mss;
u8 num_retrans; /* number of retransmits */
u8 cookie_ts:1; /* syncookie: encode tcpopts in timestamp */
@ -67,13 +68,16 @@ struct request_sock {
u32 peer_secid;
};
static inline struct request_sock *reqsk_alloc(const struct request_sock_ops *ops)
static inline struct request_sock *
reqsk_alloc(const struct request_sock_ops *ops, struct sock *sk_listener)
{
struct request_sock *req = kmem_cache_alloc(ops->slab, GFP_ATOMIC);
if (req != NULL)
if (req) {
req->rsk_ops = ops;
sock_hold(sk_listener);
req->rsk_listener = sk_listener;
}
return req;
}
@ -88,6 +92,8 @@ static inline void reqsk_free(struct request_sock *req)
WARN_ON_ONCE(atomic_read(&req->rsk_refcnt) != 0);
req->rsk_ops->destructor(req);
if (req->rsk_listener)
sock_put(req->rsk_listener);
kmem_cache_free(req->rsk_ops->slab, req);
}

2
net/ipv4/tcp_input.c
View File

@ -5970,7 +5970,7 @@ static void tcp_openreq_init(struct request_sock *req,
struct request_sock *inet_reqsk_alloc(const struct request_sock_ops *ops,
struct sock *sk_listener)
{
struct request_sock *req = reqsk_alloc(ops);
struct request_sock *req = reqsk_alloc(ops, sk_listener);
if (req) {
struct inet_request_sock *ireq = inet_rsk(req);