rxrpc: Clean up connection abort

Clean up connection abort, using the connection state_lock to gate access
to change that state, and use an rxrpc_call_completion value to indicate
the difference between local and remote aborts as these can be pasted
directly into the call state.

Signed-off-by: David Howells <[email protected]>
cc: Marc Dionne <[email protected]>
cc: [email protected]

Author: dhowells

include/trace/events/rxrpc.h

@@ -111,6 +111,7 @@
 	EM(rxrpc_conn_get_call_input,		"GET inp-call") \
 	EM(rxrpc_conn_get_conn_input,		"GET inp-conn") \
 	EM(rxrpc_conn_get_idle,			"GET idle    ") \
+	EM(rxrpc_conn_get_poke_abort,		"GET pk-abort") \
 	EM(rxrpc_conn_get_poke_timer,		"GET poke    ") \
 	EM(rxrpc_conn_get_service_conn,		"GET svc-conn") \
 	EM(rxrpc_conn_new_client,		"NEW client  ") \
@@ -128,6 +129,7 @@
 	EM(rxrpc_conn_put_unidle,		"PUT unidle  ") \
 	EM(rxrpc_conn_put_work,			"PUT work    ") \
 	EM(rxrpc_conn_queue_challenge,		"QUE chall   ") \
+	EM(rxrpc_conn_queue_retry_work,		"QUE retry-wk") \
 	EM(rxrpc_conn_queue_rx_work,		"QUE rx-work ") \
 	EM(rxrpc_conn_see_new_service_conn,	"SEE new-svc ") \
 	EM(rxrpc_conn_see_reap_service,		"SEE reap-svc") \

net/rxrpc/ar-internal.h

@@ -263,13 +263,11 @@ struct rxrpc_security {
 
 	/* respond to a challenge */
 	int (*respond_to_challenge)(struct rxrpc_connection *,
-				    struct sk_buff *,
-				    u32 *);
+				    struct sk_buff *);
 
 	/* verify a response */
 	int (*verify_response)(struct rxrpc_connection *,
-			       struct sk_buff *,
-			       u32 *);
+			       struct sk_buff *);
 
 	/* clear connection security */
 	void (*clear)(struct rxrpc_connection *);
@@ -367,6 +365,18 @@ struct rxrpc_conn_parameters {
 	u32			security_level;	/* Security level selected */
 };
 
+/*
+ * Call completion condition (state == RXRPC_CALL_COMPLETE).
+ */
+enum rxrpc_call_completion {
+	RXRPC_CALL_SUCCEEDED,		/* - Normal termination */
+	RXRPC_CALL_REMOTELY_ABORTED,	/* - call aborted by peer */
+	RXRPC_CALL_LOCALLY_ABORTED,	/* - call aborted locally on error or close */
+	RXRPC_CALL_LOCAL_ERROR,		/* - call failed due to local error */
+	RXRPC_CALL_NETWORK_ERROR,	/* - call terminated by network error */
+	NR__RXRPC_CALL_COMPLETIONS
+};
+
 /*
  * Bits in the connection flags.
  */
@@ -391,6 +401,7 @@ enum rxrpc_conn_flag {
  */
 enum rxrpc_conn_event {
 	RXRPC_CONN_EV_CHALLENGE,	/* Send challenge packet */
+	RXRPC_CONN_EV_ABORT_CALLS,	/* Abort attached calls */
 };
 
 /*
@@ -403,8 +414,7 @@ enum rxrpc_conn_proto_state {
 	RXRPC_CONN_SERVICE_UNSECURED,	/* Service unsecured connection */
 	RXRPC_CONN_SERVICE_CHALLENGING,	/* Service challenging for security */
 	RXRPC_CONN_SERVICE,		/* Service secured connection */
-	RXRPC_CONN_REMOTELY_ABORTED,	/* Conn aborted by peer */
-	RXRPC_CONN_LOCALLY_ABORTED,	/* Conn aborted locally */
+	RXRPC_CONN_ABORTED,		/* Conn aborted */
 	RXRPC_CONN__NR_STATES
 };
 
@@ -487,7 +497,8 @@ struct rxrpc_connection {
 	unsigned long		idle_timestamp;	/* Time at which last became idle */
 	spinlock_t		state_lock;	/* state-change lock */
 	enum rxrpc_conn_proto_state state;	/* current state of connection */
-	u32			abort_code;	/* Abort code of connection abort */
+	enum rxrpc_call_completion completion;	/* Completion condition */
+	s32			abort_code;	/* Abort code of connection abort */
 	int			debug_id;	/* debug ID for printks */
 	atomic_t		serial;		/* packet serial number counter */
 	unsigned int		hi_serial;	/* highest serial number received */
@@ -561,18 +572,6 @@ enum rxrpc_call_state {
 	NR__RXRPC_CALL_STATES
 };
 
-/*
- * Call completion condition (state == RXRPC_CALL_COMPLETE).
- */
-enum rxrpc_call_completion {
-	RXRPC_CALL_SUCCEEDED,		/* - Normal termination */
-	RXRPC_CALL_REMOTELY_ABORTED,	/* - call aborted by peer */
-	RXRPC_CALL_LOCALLY_ABORTED,	/* - call aborted locally on error or close */
-	RXRPC_CALL_LOCAL_ERROR,		/* - call failed due to local error */
-	RXRPC_CALL_NETWORK_ERROR,	/* - call terminated by network error */
-	NR__RXRPC_CALL_COMPLETIONS
-};
-
 /*
  * Call Tx congestion management modes.
  */
@@ -905,11 +904,19 @@ void rxrpc_clean_up_local_conns(struct rxrpc_local *);
  */
 void rxrpc_conn_retransmit_call(struct rxrpc_connection *conn, struct sk_buff *skb,
 				unsigned int channel);
+int rxrpc_abort_conn(struct rxrpc_connection *conn, struct sk_buff *skb,
+		     s32 abort_code, int err, const char *why);
 void rxrpc_process_connection(struct work_struct *);
 void rxrpc_process_delayed_final_acks(struct rxrpc_connection *, bool);
 int rxrpc_input_conn_packet(struct rxrpc_connection *conn, struct sk_buff *skb);
 void rxrpc_input_conn_event(struct rxrpc_connection *conn, struct sk_buff *skb);
 
+static inline bool rxrpc_is_conn_aborted(const struct rxrpc_connection *conn)
+{
+	/* Order reading the abort info after the state check. */
+	return smp_load_acquire(&conn->state) == RXRPC_CONN_ABORTED;
+}
+
 /*
  * conn_object.c
  */
@@ -1059,6 +1066,7 @@ static inline struct rxrpc_net *rxrpc_net(struct net *net)
 int rxrpc_send_ack_packet(struct rxrpc_call *call, struct rxrpc_txbuf *txb);
 int rxrpc_send_abort_packet(struct rxrpc_call *);
 int rxrpc_send_data_packet(struct rxrpc_call *, struct rxrpc_txbuf *);
+void rxrpc_send_conn_abort(struct rxrpc_connection *conn);
 void rxrpc_reject_packet(struct rxrpc_local *local, struct sk_buff *skb);
 void rxrpc_send_keepalive(struct rxrpc_peer *);
 void rxrpc_transmit_one(struct rxrpc_call *call, struct rxrpc_txbuf *txb);

net/rxrpc/call_object.c

@@ -443,14 +443,10 @@ void rxrpc_incoming_call(struct rxrpc_sock *rx,
 		call->state = RXRPC_CALL_SERVER_RECV_REQUEST;
 		break;
 
-	case RXRPC_CONN_REMOTELY_ABORTED:
-		__rxrpc_set_call_completion(call, RXRPC_CALL_REMOTELY_ABORTED,
+	case RXRPC_CONN_ABORTED:
+		__rxrpc_set_call_completion(call, conn->completion,
 					    conn->abort_code, conn->error);
 		break;
-	case RXRPC_CONN_LOCALLY_ABORTED:
-		__rxrpc_abort_call("CON", call, 1,
-				   conn->abort_code, conn->error);
-		break;
 	default:
 		BUG();
 	}