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authorEric Dumazet <edumazet@google.com>2015-03-19 19:04:19 -0700
committerDavid S. Miller <davem@davemloft.net>2015-03-20 12:40:25 -0400
commit52452c542559ac980b48dbf22a30ee7fa0af507c (patch)
treea212dbe95694ea11e86b9d9aca8a2eba0b06a2d1 /include/net/request_sock.h
parenta998f712f77ea4892d3fcf24e0a67603e63da128 (diff)
downloadlinux-52452c542559ac980b48dbf22a30ee7fa0af507c.tar.bz2
inet: drop prev pointer handling in request sock
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>
Diffstat (limited to 'include/net/request_sock.h')
-rw-r--r--include/net/request_sock.h15
1 files changed, 11 insertions, 4 deletions
diff --git a/include/net/request_sock.h b/include/net/request_sock.h
index e7ef86340514..65223905d139 100644
--- a/include/net/request_sock.h
+++ b/include/net/request_sock.h
@@ -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);
}