mlx4_core: Get the maximum message size from reported device capabilities

Get the maximum message size from the device capabilities returned
from the QUERY_DEV_CAP firmware command, rather than hard-coding 2 GB.

Signed-off-by: Dotan Barak <dotanb@dev.mellanox.co.il>
Signed-off-by: Michael S. Tsirkin <mst@dev.mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/net/mlx4/fw.c b/drivers/net/mlx4/fw.c
index d2b065351e45..c45cbe43a0c4 100644
--- a/drivers/net/mlx4/fw.c
+++ b/drivers/net/mlx4/fw.c
@@ -138,6 +138,7 @@ int mlx4_QUERY_DEV_CAP(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
 #define QUERY_DEV_CAP_ACK_DELAY_OFFSET          0x35
 #define QUERY_DEV_CAP_MTU_WIDTH_OFFSET          0x36
 #define QUERY_DEV_CAP_VL_PORT_OFFSET            0x37
+#define QUERY_DEV_CAP_MAX_MSG_SZ_OFFSET         0x38
 #define QUERY_DEV_CAP_MAX_GID_OFFSET            0x3b
 #define QUERY_DEV_CAP_RATE_SUPPORT_OFFSET       0x3c
 #define QUERY_DEV_CAP_MAX_PKEY_OFFSET           0x3f
@@ -220,6 +221,8 @@ int mlx4_QUERY_DEV_CAP(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
         dev_cap->local_ca_ack_delay = field & 0x1f;
         MLX4_GET(field, outbox, QUERY_DEV_CAP_VL_PORT_OFFSET);
         dev_cap->num_ports = field & 0xf;
+        MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_MSG_SZ_OFFSET);
+        dev_cap->max_msg_sz = 1 << (field & 0x1f);
         MLX4_GET(stat_rate, outbox, QUERY_DEV_CAP_RATE_SUPPORT_OFFSET);
         dev_cap->stat_rate_support = stat_rate;
         MLX4_GET(dev_cap->flags, outbox, QUERY_DEV_CAP_FLAGS_OFFSET);