linux-kernel - [PATCH net-next 08/32] rxrpc: Only disconnect calls in the I/O thread

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Date:   Tue, 06 Dec 2022 15:59:42 +0000
From:   David Howells <dhowells@...hat.com>
To:     netdev@...r.kernel.org
Cc:     Marc Dionne <marc.dionne@...istor.com>,
        linux-afs@...ts.infradead.org, dhowells@...hat.com,
        linux-afs@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH net-next 08/32] rxrpc: Only disconnect calls in the I/O thread

Only perform call disconnection in the I/O thread to reduce the locking
requirement.

Signed-off-by: David Howells <dhowells@...hat.com>
cc: Marc Dionne <marc.dionne@...istor.com>
cc: linux-afs@...ts.infradead.org
---

 include/trace/events/rxrpc.h |    1 +
 net/rxrpc/call_event.c       |   14 +++++++++++++-
 net/rxrpc/call_object.c      |    9 +--------
 net/rxrpc/input.c            |    1 -
 net/rxrpc/recvmsg.c          |    1 +
 5 files changed, 16 insertions(+), 10 deletions(-)

diff --git a/include/trace/events/rxrpc.h b/include/trace/events/rxrpc.h
index 72f020b829e0..49a0f799cdef 100644
--- a/include/trace/events/rxrpc.h
+++ b/include/trace/events/rxrpc.h
@@ -18,6 +18,7 @@
  */
 #define rxrpc_call_poke_traces \
 	EM(rxrpc_call_poke_abort,		"Abort")	\
+	EM(rxrpc_call_poke_complete,		"Compl")	\
 	EM(rxrpc_call_poke_error,		"Error")	\
 	EM(rxrpc_call_poke_idle,		"Idle")		\
 	EM(rxrpc_call_poke_start,		"Start")	\
diff --git a/net/rxrpc/call_event.c b/net/rxrpc/call_event.c
index a8b5dff09999..bf6858e69187 100644
--- a/net/rxrpc/call_event.c
+++ b/net/rxrpc/call_event.c
@@ -347,6 +347,13 @@ void rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb)
 	if (call->state == RXRPC_CALL_COMPLETE)
 		goto out;
 
+	if (!call->conn) {
+		printk("\n");
+		printk("\n");
+		kdebug("no conn %u", call->state);
+		printk("\n");
+	}
+
 	abort_code = smp_load_acquire(&call->send_abort);
 	if (abort_code)
 		rxrpc_abort_call(call->send_abort_why, call, 0, call->send_abort,
@@ -479,8 +486,13 @@ void rxrpc_input_call_event(struct rxrpc_call *call, struct sk_buff *skb)
 	}
 
 out:
-	if (call->state == RXRPC_CALL_COMPLETE)
+	if (call->state == RXRPC_CALL_COMPLETE) {
 		del_timer_sync(&call->timer);
+		if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
+			rxrpc_disconnect_call(call);
+		if (call->security)
+			call->security->free_call_crypto(call);
+	}
 	if (call->acks_hard_ack != call->tx_bottom)
 		rxrpc_shrink_call_tx_buffer(call);
 	_leave("");
diff --git a/net/rxrpc/call_object.c b/net/rxrpc/call_object.c
index f7606cdf4209..a9c77be9107a 100644
--- a/net/rxrpc/call_object.c
+++ b/net/rxrpc/call_object.c
@@ -50,7 +50,7 @@ void rxrpc_poke_call(struct rxrpc_call *call, enum rxrpc_call_poke_trace what)
 	struct rxrpc_local *local = call->local;
 	bool busy;
 
-	if (call->state < RXRPC_CALL_COMPLETE) {
+	if (!test_bit(RXRPC_CALL_DISCONNECTED, &call->flags)) {
 		spin_lock_bh(&local->lock);
 		busy = !list_empty(&call->attend_link);
 		trace_rxrpc_poke_call(call, busy, what);
@@ -529,13 +529,10 @@ void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
 	trace_rxrpc_call(call->debug_id, refcount_read(&call->ref),
 			 call->flags, rxrpc_call_see_release);
 
-	ASSERTCMP(call->state, ==, RXRPC_CALL_COMPLETE);
-
 	if (test_and_set_bit(RXRPC_CALL_RELEASED, &call->flags))
 		BUG();
 
 	rxrpc_put_call_slot(call);
-	del_timer_sync(&call->timer);
 
 	/* Make sure we don't get any more notifications */
 	spin_lock(&rx->recvmsg_lock);
@@ -568,10 +565,6 @@ void rxrpc_release_call(struct rxrpc_sock *rx, struct rxrpc_call *call)
 
 	_debug("RELEASE CALL %p (%d CONN %p)", call, call->debug_id, conn);
 
-	if (conn && !test_bit(RXRPC_CALL_DISCONNECTED, &call->flags))
-		rxrpc_disconnect_call(call);
-	if (call->security)
-		call->security->free_call_crypto(call);
 	_leave("");
 }
 
diff --git a/net/rxrpc/input.c b/net/rxrpc/input.c
index 58077b5bfb68..a72fd2f78fc0 100644
--- a/net/rxrpc/input.c
+++ b/net/rxrpc/input.c
@@ -1010,5 +1010,4 @@ void rxrpc_implicit_end_call(struct rxrpc_call *call, struct sk_buff *skb)
 	}
 
 	rxrpc_input_call_event(call, skb);
-	rxrpc_disconnect_call(call);
 }
diff --git a/net/rxrpc/recvmsg.c b/net/rxrpc/recvmsg.c
index 492608973935..88298ab8a9d7 100644
--- a/net/rxrpc/recvmsg.c
+++ b/net/rxrpc/recvmsg.c
@@ -202,6 +202,7 @@ static void rxrpc_end_rx_phase(struct rxrpc_call *call, rxrpc_serial_t serial)
 	case RXRPC_CALL_CLIENT_RECV_REPLY:
 		__rxrpc_call_completed(call);
 		spin_unlock(&call->state_lock);
+		rxrpc_poke_call(call, rxrpc_call_poke_complete);
 		break;
 
 	case RXRPC_CALL_SERVER_RECV_REQUEST: