rxrpc: Add more CHALLENGE/RESPONSE packet tracing

Add more tracing for CHALLENGE and RESPONSE packets. Currently, rxrpc only
has client-relevant tracepoints (rx_challenge and tx_response), but add the
server-side ones too.

Further, record the service ID in the rx_challenge tracepoint as well.

Signed-off-by: David Howells <[e-mail]>
cc: Marc Dionne <[e-mail]>
cc: Simon Horman <[e-mail]>
cc: [e-mail]
Link: https://patch.msgid.link/[e-mail]
Signed-off-by: Jakub Kicinski <[e-mail]>

include/trace/events/rxrpc.h

···
 		      __entry->abort_code)
 	    );
 
+TRACE_EVENT(rxrpc_tx_challenge,
+	    TP_PROTO(struct rxrpc_connection *conn, rxrpc_serial_t serial,
+		     u32 version, u32 nonce),
+
+	    TP_ARGS(conn, serial, version, nonce),
+
+	    TP_STRUCT__entry(
+		    __field(unsigned int,	conn)
+		    __field(rxrpc_serial_t,	serial)
+		    __field(u32,		version)
+		    __field(u32,		nonce)
+		    __field(u16,		service_id)
+		    __field(u8,			security_ix)
+			     ),
+
+	    TP_fast_assign(
+		    __entry->conn = conn->debug_id;
+		    __entry->serial = serial;
+		    __entry->version = version;
+		    __entry->nonce = nonce;
+		    __entry->service_id = conn->service_id;
+		    __entry->security_ix = conn->security_ix;
+			   ),
+
+	    TP_printk("C=%08x CHALLENGE r=%08x sv=%u+%u v=%x n=%x",
+		      __entry->conn,
+		      __entry->serial,
+		      __entry->service_id,
+		      __entry->security_ix,
+		      __entry->version,
+		      __entry->nonce)
+	    );
+
 TRACE_EVENT(rxrpc_rx_challenge,
 	    TP_PROTO(struct rxrpc_connection *conn, rxrpc_serial_t serial,
 		     u32 version, u32 nonce, u32 min_level),
···
 		    __field(u32,		version)
 		    __field(u32,		nonce)
 		    __field(u32,		min_level)
+		    __field(u16,		service_id)
 		    __field(u8,			security_ix)
 			     ),
 
···
 		    __entry->version = version;
 		    __entry->nonce = nonce;
 		    __entry->min_level = min_level;
+		    __entry->service_id = conn->service_id;
 		    __entry->security_ix = conn->security_ix;
 			   ),
 
-	    TP_printk("C=%08x CHALLENGE r=%08x sx=%u v=%x n=%x ml=%x",
+	    TP_printk("C=%08x CHALLENGE r=%08x sv=%u+%u v=%x n=%x ml=%x",
 		      __entry->conn,
 		      __entry->serial,
+		      __entry->service_id,
 		      __entry->security_ix,
 		      __entry->version,
 		      __entry->nonce,
 		      __entry->min_level)
+	    );
+
+TRACE_EVENT(rxrpc_tx_response,
+	    TP_PROTO(struct rxrpc_connection *conn, rxrpc_serial_t serial,
+		     struct rxrpc_skb_priv *rsp),
+
+	    TP_ARGS(conn, serial, rsp),
+
+	    TP_STRUCT__entry(
+		    __field(unsigned int,	conn)
+		    __field(rxrpc_serial_t,	serial)
+		    __field(rxrpc_serial_t,	challenge)
+		    __field(u32,		version)
+		    __field(u32,		kvno)
+		    __field(u16,		ticket_len)
+		    __field(u16,		appdata_len)
+		    __field(u16,		service_id)
+		    __field(u8,			security_ix)
+			     ),
+
+	    TP_fast_assign(
+		    __entry->conn	= conn->debug_id;
+		    __entry->serial	= serial;
+		    __entry->challenge	= rsp->resp.challenge_serial;
+		    __entry->version	= rsp->resp.version;
+		    __entry->kvno	= rsp->resp.kvno;
+		    __entry->ticket_len = rsp->resp.ticket_len;
+		    __entry->service_id = conn->service_id;
+		    __entry->security_ix = conn->security_ix;
+			   ),
+
+	    TP_printk("C=%08x RESPONSE r=%08x cr=%08x sv=%u+%u v=%x kv=%x tl=%u",
+		      __entry->conn,
+		      __entry->serial,
+		      __entry->challenge,
+		      __entry->service_id,
+		      __entry->security_ix,
+		      __entry->version,
+		      __entry->kvno,
+		      __entry->ticket_len)
 	    );
 
 TRACE_EVENT(rxrpc_rx_response,

net/rxrpc/output.c

···
 	serial = rxrpc_get_next_serials(conn, 1);
 	wserial = htonl(serial);
 
+	trace_rxrpc_tx_response(conn, serial, sp);
+
 	ret = skb_store_bits(response, offsetof(struct rxrpc_wire_header, serial),
 			     &wserial, sizeof(wserial));
 	if (ret < 0)

net/rxrpc/rxgk.c

···
 	serial = rxrpc_get_next_serials(conn, 1);
 	whdr->serial = htonl(serial);
 
+	trace_rxrpc_tx_challenge(conn, serial, 0, *(u32 *)&conn->rxgk.nonce);
+
 	ret = do_udp_sendmsg(conn->local->socket, &msg, len);
 	if (ret > 0)
 		conn->peer->last_tx_at = ktime_get_seconds();
···
 	token_len	= ntohl(rhdr.token_len);
 	if (xdr_round_up(token_len) + sizeof(__be32) > len)
 		goto short_packet;
+
+	trace_rxrpc_rx_response(conn, sp->hdr.serial, 0, sp->hdr.cksum, token_len);
 
 	offset	+= xdr_round_up(token_len);
 	len	-= xdr_round_up(token_len);

net/rxrpc/rxkad.c

···
 	serial = rxrpc_get_next_serial(conn);
 	whdr.serial = htonl(serial);
 
+	trace_rxrpc_tx_challenge(conn, serial, 0, conn->rxkad.nonce);
+
 	ret = kernel_sendmsg(conn->local->socket, &msg, iov, 2, len);
 	if (ret < 0) {
 		trace_rxrpc_tx_fail(conn->debug_id, serial, ret,