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>

diff --git a/drivers/net/ethernet/mellanox/mlx4/mcg.c b/drivers/net/ethernet/mellanox/mlx4/mcg.c
index 04a8636a0b7e6d2cb8a4c8ba9d8ceb78a8b95a97..39ab85a56c9a2f754a10d7c8d8ede8e1aabdc593 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx4/mcg.c
+++ b/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);