smb: client: limit the range of info->receive_credit_target

This simplifies further changes...

Cc: Steve French <smfrench@gmail.com>
Cc: Tom Talpey <tom@talpey.com>
Cc: Long Li <longli@microsoft.com>
Cc: linux-cifs@vger.kernel.org
Cc: samba-technical@lists.samba.org
Acked-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Stefan Metzmacher <metze@samba.org>
Signed-off-by: Steve French <stfrench@microsoft.com>

Author: metze-samba

fs/smb/client/smbdirect.c

@@ -483,6 +483,7 @@ static bool process_negotiation_response(
 		return false;
 	}
 	info->receive_credit_target = le16_to_cpu(packet->credits_requested);
+	info->receive_credit_target = min_t(u16, info->receive_credit_target, sp->recv_credit_max);
 
 	if (packet->credits_granted == 0) {
 		log_rdma_event(ERR, "error: credits_granted==0\n");
@@ -590,7 +591,7 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
 	struct smbdirect_socket_parameters *sp = &sc->parameters;
 	struct smbd_connection *info =
 		container_of(sc, struct smbd_connection, socket);
-	int old_recv_credit_target;
+	u16 old_recv_credit_target;
 	u32 data_offset = 0;
 	u32 data_length = 0;
 	u32 remaining_data_length = 0;
@@ -668,6 +669,10 @@ static void recv_done(struct ib_cq *cq, struct ib_wc *wc)
 		old_recv_credit_target = info->receive_credit_target;
 		info->receive_credit_target =
 			le16_to_cpu(data_transfer->credits_requested);
+		info->receive_credit_target =
+			min_t(u16, info->receive_credit_target, sp->recv_credit_max);
+		info->receive_credit_target =
+			max_t(u16, info->receive_credit_target, 1);
 		if (le16_to_cpu(data_transfer->credits_granted)) {
 			atomic_add(le16_to_cpu(data_transfer->credits_granted),
 				&sc->send_io.credits.count);

fs/smb/client/smbdirect.h

@@ -54,7 +54,7 @@ struct smbd_connection {
 	enum keep_alive_status keep_alive_requested;
 	int protocol;
 	atomic_t receive_credits;
-	int receive_credit_target;
+	u16 receive_credit_target;
 
 	/* Memory registrations */
 	/* Maximum number of RDMA read/write outstanding on this connection */