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>

5 files changed, 7 insertions, 1 deletions

diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
index c591616dccde..2fc8ccebaac1 100644
--- a/drivers/infiniband/hw/mlx4/main.c
+++ b/drivers/infiniband/hw/mlx4/main.c
@@ -169,7 +169,7 @@ static int mlx4_ib_query_port(struct ib_device *ibdev, u8 port,
         props->phys_state       = out_mad->data[33] >> 4;
         props->port_cap_flags   = be32_to_cpup((__be32 *) (out_mad->data + 20));
         props->gid_tbl_len      = to_mdev(ibdev)->dev->caps.gid_table_len[port];
-        props->max_msg_sz       = 0x80000000;
+        props->max_msg_sz       = to_mdev(ibdev)->dev->caps.max_msg_sz;
         props->pkey_tbl_len     = to_mdev(ibdev)->dev->caps.pkey_table_len[port];
         props->bad_pkey_cntr    = be16_to_cpup((__be16 *) (out_mad->data + 46));
         props->qkey_viol_cntr   = be16_to_cpup((__be16 *) (out_mad->data + 48));
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);
diff --git a/drivers/net/mlx4/fw.h b/drivers/net/mlx4/fw.h
index 296254ac27c1..7e1dd9e25cfb 100644
--- a/drivers/net/mlx4/fw.h
+++ b/drivers/net/mlx4/fw.h
@@ -60,6 +60,7 @@ struct mlx4_dev_cap {
         int max_rdma_global;
         int local_ca_ack_delay;
         int num_ports;
+        u32 max_msg_sz;
         int max_mtu[MLX4_MAX_PORTS + 1];
         int max_port_width[MLX4_MAX_PORTS + 1];
         int max_vl[MLX4_MAX_PORTS + 1];
diff --git a/drivers/net/mlx4/main.c b/drivers/net/mlx4/main.c
index c3da2a2f5431..a4f2e0475a71 100644
--- a/drivers/net/mlx4/main.c
+++ b/drivers/net/mlx4/main.c
@@ -154,6 +154,7 @@ static int __devinit mlx4_dev_cap(struct mlx4_dev *dev, struct mlx4_dev_cap *dev
         dev->caps.reserved_uars      = dev_cap->reserved_uars;
         dev->caps.reserved_pds       = dev_cap->reserved_pds;
         dev->caps.mtt_entry_sz       = MLX4_MTT_ENTRY_PER_SEG * dev_cap->mtt_entry_sz;
+        dev->caps.max_msg_sz         = dev_cap->max_msg_sz;
         dev->caps.page_size_cap      = ~(u32) (dev_cap->min_page_sz - 1);
         dev->caps.flags              = dev_cap->flags;
         dev->caps.stat_rate_support  = dev_cap->stat_rate_support;
diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index b372f5910fc1..8209387ee854 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -172,6 +172,7 @@ struct mlx4_caps {
         int                     num_pds;
         int                     reserved_pds;
         int                     mtt_entry_sz;
+        u32                     max_msg_sz;
         u32                     page_size_cap;
         u32                     flags;
         u16                     stat_rate_support;