net/mlx4_core: Make sure the max number of QPs per MCG isn't exceeded

In B0 steering mode when adding QPs to the default MCG entry need
to check that maximal number of QPs per MCG entry was not exceeded.
Signed-off-by: Alexander Guller <alexg@mellanox.com>
Reviewed-by: Aviad Yehezkel <aviadye@mellanox.co.il>
Signed-off-by: Eugenia Emantayev <eugenia@mellanox.com>
Signed-off-by: Amir Vadai <amirv@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/ethernet/mellanox/mlx4/mcg.c

@@ -477,8 +477,14 @@ static int add_promisc_qp(struct mlx4_dev *dev, u8 port,
 	/* now need to add all the promisc qps to default entry */
 	memset(mgm, 0, sizeof *mgm);
 	members_count = 0;
-	list_for_each_entry(dqp, &s_steer->promisc_qps[steer], list)
+	list_for_each_entry(dqp, &s_steer->promisc_qps[steer], list) {
+		if (members_count == dev->caps.num_qp_per_mgm) {
+			/* entry is full */
+			err = -ENOMEM;
+			goto out_list;
+		}
 		mgm->qp[members_count++] = cpu_to_be32(dqp->qpn & MGM_QPN_MASK);
+	}
 	mgm->members_count = cpu_to_be32(members_count | MLX4_PROT_ETH << 30);
 
 	err = mlx4_WRITE_PROMISC(dev, port, steer, mailbox);