Commit 557eadfc authored by Christoph Hellwig's avatar Christoph Hellwig Committed by David S. Miller
Browse files

tcp: add tcp_sock_set_syncnt 



Add a helper to directly set the TCP_SYNCNT sockopt from kernel space
without going through a fake uaccess.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Acked-by: default avatarSagi Grimberg <sagi@grimberg.me>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent ddd061b8

drivers/nvme/host/tcp.c

+1 −8
Original line number Diff line number Diff line
@@ -1336,14 +1336,7 @@ static int nvme_tcp_alloc_queue(struct nvme_ctrl *nctrl, 
	}



	/* Single syn retry */

	opt = 1;

	ret = kernel_setsockopt(queue->sock, IPPROTO_TCP, TCP_SYNCNT,

			(char *)&opt, sizeof(opt));

	if (ret) {

		dev_err(nctrl->device,

			"failed to set TCP_SYNCNT sock opt %d\n", ret);

		goto err_sock;

	}

	tcp_sock_set_syncnt(queue->sock->sk, 1);



	/* Set TCP no delay */

	tcp_sock_set_nodelay(queue->sock->sk);

include/linux/tcp.h

+1 −0
Original line number Diff line number Diff line
@@ -500,5 +500,6 @@ int tcp_skb_shift(struct sk_buff *to, struct sk_buff *from, int pcount, 
void tcp_sock_set_cork(struct sock *sk, bool on);

void tcp_sock_set_nodelay(struct sock *sk);

void tcp_sock_set_quickack(struct sock *sk, int val);

int tcp_sock_set_syncnt(struct sock *sk, int val);



#endif	/* _LINUX_TCP_H */

net/ipv4/tcp.c

+12 −0
Original line number Diff line number Diff line
@@ -2881,6 +2881,18 @@ void tcp_sock_set_quickack(struct sock *sk, int val) 
}

EXPORT_SYMBOL(tcp_sock_set_quickack);



int tcp_sock_set_syncnt(struct sock *sk, int val)

{

	if (val < 1 || val > MAX_TCP_SYNCNT)

		return -EINVAL;



	lock_sock(sk);

	inet_csk(sk)->icsk_syn_retries = val;

	release_sock(sk);

	return 0;

}

EXPORT_SYMBOL(tcp_sock_set_syncnt);



/*

 *	Socket option code for TCP.

 */

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