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inet: drop prev pointer handling in request sock

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When request sock are put in ehash table, the whole notion
of having a previous request to update dl_next is pointless.

Also, following patch will get rid of big purge timer,
so we want to delete a request sock without holding listener lock.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet 2015-03-19 19:04:19 -07:00 • committed by David S. Miller
parent a998f712f7
commit 52452c5425
14 changed files with 67 additions and 74 deletions
Download patch file Download diff file Expand all files Collapse all files

15
include/net/request_sock.h
View file

@ -50,6 +50,7 @@ int inet_rtx_syn_ack(struct sock *parent, struct request_sock *req);
struct request_sock {
struct sock_common __req_common;
#define rsk_refcnt __req_common.skc_refcnt
#define rsk_hash __req_common.skc_hash
struct request_sock *dl_next;
struct sock *rsk_listener;
@ -216,11 +217,16 @@ static inline int reqsk_queue_empty(struct request_sock_queue *queue)
}
static inline void reqsk_queue_unlink(struct request_sock_queue *queue,
struct request_sock *req,
struct request_sock **prev_req)
struct request_sock *req)
{
struct listen_sock *lopt = queue->listen_opt;
struct request_sock **prev;
write_lock(&queue->syn_wait_lock);
*prev_req = req->dl_next;
prev = &lopt->syn_table[req->rsk_hash];
while (*prev != req)
prev = &(*prev)->dl_next;
*prev = req->dl_next;
write_unlock(&queue->syn_wait_lock);
}
@ -300,7 +306,6 @@ static inline void reqsk_queue_hash_req(struct request_sock_queue *queue,
req->num_retrans = 0;
req->num_timeout = 0;
req->sk = NULL;
req->dl_next = lopt->syn_table[hash];
/* before letting lookups find us, make sure all req fields
* are committed to memory and refcnt initialized.
@ -308,7 +313,9 @@ static inline void reqsk_queue_hash_req(struct request_sock_queue *queue,
smp_wmb();
atomic_set(&req->rsk_refcnt, 1);
req->rsk_hash = hash;
write_lock(&queue->syn_wait_lock);
req->dl_next = lopt->syn_table[hash];
lopt->syn_table[hash] = req;
write_unlock(&queue->syn_wait_lock);
}