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tcp: add a spinlock to protect struct request_sock_queue

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struct request_sock_queue fields are currently protected
by the listener 'lock' (not a real spinlock)

We need to add a private spinlock instead, so that softirq handlers
creating children do not have to worry with backlog notion
that the listener 'lock' carries.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eric Dumazet
2015-10-02 11:43:23 -07:00
committed by David S. Miller
parent f6d3125fa3
commit fff1f3001c
3 changed files with 26 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
include/net/request_sock.h
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@@ -176,9 +176,11 @@ struct fastopen_queue {
*
*/
struct request_sock_queue {
spinlock_t rskq_lock;
u8 rskq_defer_accept;
struct request_sock *rskq_accept_head;
struct request_sock *rskq_accept_tail;
u8 rskq_defer_accept;
struct listen_sock *listen_opt;
struct fastopen_queue fastopenq; /* Check max_qlen != 0 to determine
* if TFO is enabled.
@@ -196,16 +198,7 @@ void reqsk_queue_destroy(struct request_sock_queue *queue);
void reqsk_fastopen_remove(struct sock *sk, struct request_sock *req,
bool reset);
static inline struct request_sock *
reqsk_queue_yank_acceptq(struct request_sock_queue *queue)
{
struct request_sock *req = queue->rskq_accept_head;
queue->rskq_accept_head = NULL;
return req;
}
static inline int reqsk_queue_empty(struct request_sock_queue *queue)
static inline bool reqsk_queue_empty(const struct request_sock_queue *queue)
{
return queue->rskq_accept_head == NULL;
}
@@ -215,6 +208,7 @@ static inline void reqsk_queue_add(struct request_sock_queue *queue,
struct sock *parent,
struct sock *child)
{
spin_lock(&queue->rskq_lock);
req->sk = child;
sk_acceptq_added(parent);
@@ -225,18 +219,23 @@ static inline void reqsk_queue_add(struct request_sock_queue *queue,
queue->rskq_accept_tail = req;
req->dl_next = NULL;
spin_unlock(&queue->rskq_lock);
}
static inline struct request_sock *reqsk_queue_remove(struct request_sock_queue *queue)
static inline struct request_sock *reqsk_queue_remove(struct request_sock_queue *queue,
struct sock *parent)
{
struct request_sock *req = queue->rskq_accept_head;
WARN_ON(req == NULL);
queue->rskq_accept_head = req->dl_next;
if (queue->rskq_accept_head == NULL)
queue->rskq_accept_tail = NULL;
struct request_sock *req;
spin_lock_bh(&queue->rskq_lock);
req = queue->rskq_accept_head;
if (req) {
sk_acceptq_removed(parent);
queue->rskq_accept_head = req->dl_next;
if (queue->rskq_accept_head == NULL)
queue->rskq_accept_tail = NULL;
}
spin_unlock_bh(&queue->rskq_lock);
return req;
}