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authorEli Cohen <eli@mellanox.co.il>2009-05-28 01:38:34 +0400
committerRoland Dreier <rolandd@cisco.com>2009-05-28 01:38:34 +0400
commitab6bf42e2339580b5d87746d0ff4da4b1578b03e (patch)
tree670b1e1168e2a89ad782879154c9cdc9785b1c4c /drivers/net/mlx4/main.c
parent210af919c949a7d6bd330916ef376cec2907d81e (diff)
downloadlinux-ab6bf42e2339580b5d87746d0ff4da4b1578b03e.tar.xz
mlx4_core: Add module parameter for number of MTTs per segment
The current MTT allocator uses kmalloc() to allocate a buffer for its buddy allocator, and thus is limited in the amount of MTT segments that it can control. As a result, the size of memory that can be registered is limited too. This patch uses a module parameter to control the number of MTT entries that each segment represents, allowing more memory to be registered with the same number of segments. Signed-off-by: Eli Cohen <eli@mellanox.co.il> Signed-off-by: Roland Dreier <rolandd@cisco.com>
Diffstat (limited to 'drivers/net/mlx4/main.c')
-rw-r--r--drivers/net/mlx4/main.c14
1 files changed, 12 insertions, 2 deletions
diff --git a/drivers/net/mlx4/main.c b/drivers/net/mlx4/main.c
index 30bea9689694..018348c01193 100644
--- a/drivers/net/mlx4/main.c
+++ b/drivers/net/mlx4/main.c
@@ -100,6 +100,10 @@ module_param_named(use_prio, use_prio, bool, 0444);
MODULE_PARM_DESC(use_prio, "Enable steering by VLAN priority on ETH ports "
"(0/1, default 0)");
+static int log_mtts_per_seg = ilog2(MLX4_MTT_ENTRY_PER_SEG);
+module_param_named(log_mtts_per_seg, log_mtts_per_seg, int, 0444);
+MODULE_PARM_DESC(log_mtts_per_seg, "Log2 number of MTT entries per segment (1-5)");
+
int mlx4_check_port_params(struct mlx4_dev *dev,
enum mlx4_port_type *port_type)
{
@@ -203,12 +207,13 @@ static int mlx4_dev_cap(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
dev->caps.max_cqes = dev_cap->max_cq_sz - 1;
dev->caps.reserved_cqs = dev_cap->reserved_cqs;
dev->caps.reserved_eqs = dev_cap->reserved_eqs;
+ dev->caps.mtts_per_seg = 1 << log_mtts_per_seg;
dev->caps.reserved_mtts = DIV_ROUND_UP(dev_cap->reserved_mtts,
- MLX4_MTT_ENTRY_PER_SEG);
+ dev->caps.mtts_per_seg);
dev->caps.reserved_mrws = dev_cap->reserved_mrws;
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.mtt_entry_sz = dev->caps.mtts_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;
@@ -1304,6 +1309,11 @@ static int __init mlx4_verify_params(void)
return -1;
}
+ if ((log_mtts_per_seg < 1) || (log_mtts_per_seg > 5)) {
+ printk(KERN_WARNING "mlx4_core: bad log_mtts_per_seg: %d\n", log_mtts_per_seg);
+ return -1;
+ }
+
return 0;
}