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Subject[PATCH 4.4 091/135] net: Do not clear the sock TX queue in sk_set_socket()
Date
From: Tariq Toukan <tariqt@mellanox.com>

[ Upstream commit 41b14fb8724d5a4b382a63cb4a1a61880347ccb8 ]

Clearing the sock TX queue in sk_set_socket() might cause unexpected
out-of-order transmit when called from sock_orphan(), as outstanding
packets can pick a different TX queue and bypass the ones already queued.

This is undesired in general. More specifically, it breaks the in-order
scheduling property guarantee for device-offloaded TLS sockets.

Remove the call to sk_tx_queue_clear() in sk_set_socket(), and add it
explicitly only where needed.

Fixes: e022f0b4a03f ("net: Introduce sk_tx_queue_mapping")
Signed-off-by: Tariq Toukan <tariqt@mellanox.com>
Reviewed-by: Boris Pismenny <borisp@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
include/net/sock.h | 1 -
net/core/sock.c | 2 ++
2 files changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/net/sock.h b/include/net/sock.h
index be5ec94020f1a..426a57874964c 100644
--- a/include/net/sock.h
+++ b/include/net/sock.h
@@ -1678,7 +1678,6 @@ static inline int sk_tx_queue_get(const struct sock *sk)

static inline void sk_set_socket(struct sock *sk, struct socket *sock)
{
- sk_tx_queue_clear(sk);
sk->sk_socket = sock;
}

diff --git a/net/core/sock.c b/net/core/sock.c
index 60b19c3bb0f7d..120d5058d81ae 100644
--- a/net/core/sock.c
+++ b/net/core/sock.c
@@ -1435,6 +1435,7 @@ struct sock *sk_alloc(struct net *net, int family, gfp_t priority,

sock_update_classid(sk);
sock_update_netprioidx(sk);
+ sk_tx_queue_clear(sk);
}

return sk;
@@ -1601,6 +1602,7 @@ struct sock *sk_clone_lock(const struct sock *sk, const gfp_t priority)
*/
sk_refcnt_debug_inc(newsk);
sk_set_socket(newsk, NULL);
+ sk_tx_queue_clear(newsk);
newsk->sk_wq = NULL;

sk_update_clone(sk, newsk);
--
2.25.1
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