[PATCH net v2] net/tls: Inform user space about send buffer availability

[Vakul Garg]

A previous fix ("tls: Fix write space handling") assumed that
user space application gets informed about the socket send buffer
availability when tls_push_sg() gets called. Inside tls_push_sg(), in
case do_tcp_sendpages() returns 0, the function returns without calling
ctx->sk_write_space. Further, the new function tls_sw_write_space()
did not invoke ctx->sk_write_space. This leads to situation that user
space application encounters a lockup always waiting for socket send
buffer to become available.

Rather than call ctx->sk_write_space from tls_push_sg(), it should be
called from tls_write_space. So whenever tcp stack invokes
sk->sk_write_space after freeing socket send buffer, we always declare
the same to user space by the way of invoking ctx->sk_write_space.

Fixes: 7463d3a2db0ef ("tls: Fix write space handling")
Signed-off-by: Vakul Garg <vakul.g...@nxp.com>
Reviewed-by: Boris Pismenny <bor...@mellanox.com>
---
 net/tls/tls_device.c | 3 ---
 net/tls/tls_main.c   | 3 ++-
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/net/tls/tls_device.c b/net/tls/tls_device.c
index 4a1da837a733..135a7ee9db03 100644
--- a/net/tls/tls_device.c
+++ b/net/tls/tls_device.c
@@ -558,9 +558,6 @@ void tls_device_write_space(struct sock *sk, struct 
tls_context *ctx)
                                             MSG_DONTWAIT | MSG_NOSIGNAL);
                sk->sk_allocation = sk_allocation;
        }
-
-       if (!rc)
-               ctx->sk_write_space(sk);
 }
 
 void handle_device_resync(struct sock *sk, u32 seq, u64 rcd_sn)
diff --git a/net/tls/tls_main.c b/net/tls/tls_main.c
index 17e8667917aa..df921a2904b9 100644
--- a/net/tls/tls_main.c
+++ b/net/tls/tls_main.c
@@ -146,7 +146,6 @@ int tls_push_sg(struct sock *sk,
        }
 
        ctx->in_tcp_sendpages = false;
-       ctx->sk_write_space(sk);
 
        return 0;
 }
@@ -228,6 +227,8 @@ static void tls_write_space(struct sock *sk)
        else
 #endif
                tls_sw_write_space(sk, ctx);
+
+       ctx->sk_write_space(sk);
 }
 
 static void tls_ctx_free(struct tls_context *ctx)
-- 
2.13.6