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tls: suppress wakeups unless we have a full record

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TLS does not override .poll() so TLS-enabled socket will generate
an event whenever data arrives at the TCP socket. This leads to
unnecessary wakeups on slow connections.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jakub Kicinski 2023-05-31 08:35:50 -07:00 committed by David S. Miller
parent a395b8d1c7
commit 121dca784f
1 changed files with 35 additions and 0 deletions
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35
net/tls/tls_main.c
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@ -358,6 +358,39 @@ static void tls_sk_proto_close(struct sock *sk, long timeout)
tls_ctx_free(sk, ctx);
}
static __poll_t tls_sk_poll(struct file *file, struct socket *sock,
struct poll_table_struct *wait)
{
struct tls_sw_context_rx *ctx;
struct tls_context *tls_ctx;
struct sock *sk = sock->sk;
struct sk_psock *psock;
__poll_t mask = 0;
u8 shutdown;
int state;
mask = tcp_poll(file, sock, wait);
state = inet_sk_state_load(sk);
shutdown = READ_ONCE(sk->sk_shutdown);
if (unlikely(state != TCP_ESTABLISHED || shutdown & RCV_SHUTDOWN))
return mask;
tls_ctx = tls_get_ctx(sk);
ctx = tls_sw_ctx_rx(tls_ctx);
psock = sk_psock_get(sk);
if (skb_queue_empty_lockless(&ctx->rx_list) &&
!tls_strp_msg_ready(ctx) &&
sk_psock_queue_empty(psock))
mask &= ~(EPOLLIN | EPOLLRDNORM);
if (psock)
sk_psock_put(sk, psock);
return mask;
}
static int do_tls_getsockopt_conf(struct sock *sk, char __user *optval,
int __user *optlen, int tx)
{
@ -928,9 +961,11 @@ static void build_proto_ops(struct proto_ops ops[TLS_NUM_CONFIG][TLS_NUM_CONFIG]
ops[TLS_BASE][TLS_SW ] = ops[TLS_BASE][TLS_BASE];
ops[TLS_BASE][TLS_SW ].splice_read = tls_sw_splice_read;
ops[TLS_BASE][TLS_SW ].poll = tls_sk_poll;
ops[TLS_SW ][TLS_SW ] = ops[TLS_SW ][TLS_BASE];
ops[TLS_SW ][TLS_SW ].splice_read = tls_sw_splice_read;
ops[TLS_SW ][TLS_SW ].poll = tls_sk_poll;
#ifdef CONFIG_TLS_DEVICE
ops[TLS_HW ][TLS_BASE] = ops[TLS_BASE][TLS_BASE];