CIFS: SMBD: Add SMB Direct debug counters

For debugging and troubleshooting, export SMBDirect debug counters to
/proc/fs/cifs/DebugData.
Signed-off-by: Long Li <longli@microsoft.com>
Signed-off-by: Steve French <smfrench@gmail.com>
Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com>
Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>

fs/cifs/cifs_debug.c

@@ -155,6 +155,72 @@ static int cifs_debug_data_proc_show(struct seq_file *m, void *v)
 	list_for_each(tmp1, &cifs_tcp_ses_list) {
 		server = list_entry(tmp1, struct TCP_Server_Info,
 				    tcp_ses_list);
+
+#ifdef CONFIG_CIFS_SMB_DIRECT
+		if (!server->rdma)
+			goto skip_rdma;
+
+		seq_printf(m, "\nSMBDirect (in hex) protocol version: %x "
+			"transport status: %x",
+			server->smbd_conn->protocol,
+			server->smbd_conn->transport_status);
+		seq_printf(m, "\nConn receive_credit_max: %x "
+			"send_credit_target: %x max_send_size: %x",
+			server->smbd_conn->receive_credit_max,
+			server->smbd_conn->send_credit_target,
+			server->smbd_conn->max_send_size);
+		seq_printf(m, "\nConn max_fragmented_recv_size: %x "
+			"max_fragmented_send_size: %x max_receive_size:%x",
+			server->smbd_conn->max_fragmented_recv_size,
+			server->smbd_conn->max_fragmented_send_size,
+			server->smbd_conn->max_receive_size);
+		seq_printf(m, "\nConn keep_alive_interval: %x "
+			"max_readwrite_size: %x rdma_readwrite_threshold: %x",
+			server->smbd_conn->keep_alive_interval,
+			server->smbd_conn->max_readwrite_size,
+			server->smbd_conn->rdma_readwrite_threshold);
+		seq_printf(m, "\nDebug count_get_receive_buffer: %x "
+			"count_put_receive_buffer: %x count_send_empty: %x",
+			server->smbd_conn->count_get_receive_buffer,
+			server->smbd_conn->count_put_receive_buffer,
+			server->smbd_conn->count_send_empty);
+		seq_printf(m, "\nRead Queue count_reassembly_queue: %x "
+			"count_enqueue_reassembly_queue: %x "
+			"count_dequeue_reassembly_queue: %x "
+			"fragment_reassembly_remaining: %x "
+			"reassembly_data_length: %x "
+			"reassembly_queue_length: %x",
+			server->smbd_conn->count_reassembly_queue,
+			server->smbd_conn->count_enqueue_reassembly_queue,
+			server->smbd_conn->count_dequeue_reassembly_queue,
+			server->smbd_conn->fragment_reassembly_remaining,
+			server->smbd_conn->reassembly_data_length,
+			server->smbd_conn->reassembly_queue_length);
+		seq_printf(m, "\nCurrent Credits send_credits: %x "
+			"receive_credits: %x receive_credit_target: %x",
+			atomic_read(&server->smbd_conn->send_credits),
+			atomic_read(&server->smbd_conn->receive_credits),
+			server->smbd_conn->receive_credit_target);
+		seq_printf(m, "\nPending send_pending: %x send_payload_pending:"
+			" %x smbd_send_pending: %x smbd_recv_pending: %x",
+			atomic_read(&server->smbd_conn->send_pending),
+			atomic_read(&server->smbd_conn->send_payload_pending),
+			server->smbd_conn->smbd_send_pending,
+			server->smbd_conn->smbd_recv_pending);
+		seq_printf(m, "\nReceive buffers count_receive_queue: %x "
+			"count_empty_packet_queue: %x",
+			server->smbd_conn->count_receive_queue,
+			server->smbd_conn->count_empty_packet_queue);
+		seq_printf(m, "\nMR responder_resources: %x "
+			"max_frmr_depth: %x mr_type: %x",
+			server->smbd_conn->responder_resources,
+			server->smbd_conn->max_frmr_depth,
+			server->smbd_conn->mr_type);
+		seq_printf(m, "\nMR mr_ready_count: %x mr_used_count: %x",
+			atomic_read(&server->smbd_conn->mr_ready_count),
+			atomic_read(&server->smbd_conn->mr_used_count));
+skip_rdma:
+#endif
 		seq_printf(m, "\nNumber of credits: %d", server->credits);
 		i++;
 		list_for_each(tmp2, &server->smb_ses_list) {