[PATCH 15/33] tcp: add tcp_sock_set_syncnt
From: Christoph Hellwig <hch@lst.de>
Date: 2020-05-20 19:59:36
Also in:
ceph-devel, linux-cifs, linux-nfs, linux-nvme, linux-rdma, linux-sctp, lkml, ocfs2-devel, target-devel
Subsystem:
networking [general], networking [tcp], nvm express driver, the rest · Maintainers:
"David S. Miller", Eric Dumazet, Jakub Kicinski, Paolo Abeni, Neal Cardwell, Keith Busch, Jens Axboe, Christoph Hellwig, Sagi Grimberg, Linus Torvalds
Add a helper to directly set the TCP_SYNCNT sockopt from kernel space without going through a fake uaccess. Signed-off-by: Christoph Hellwig <hch@lst.de> Acked-by: Sagi Grimberg <sagi@grimberg.me> --- drivers/nvme/host/tcp.c | 9 +-------- include/linux/tcp.h | 1 + net/ipv4/tcp.c | 12 ++++++++++++ 3 files changed, 14 insertions(+), 8 deletions(-)
diff --git a/drivers/nvme/host/tcp.c b/drivers/nvme/host/tcp.c
index 4e4a750ecdb97..2872584f52f63 100644
--- a/drivers/nvme/host/tcp.c
+++ b/drivers/nvme/host/tcp.c@@ -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);
diff --git a/include/linux/tcp.h b/include/linux/tcp.h
index 2eaf8320b9db0..6aa4ae5ebf3d5 100644
--- a/include/linux/tcp.h
+++ b/include/linux/tcp.h@@ -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 */
diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index 27b5e7a4e2ef9..d2c67ae1da07a 100644
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c@@ -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. */
--
2.26.2