Commit 76e39ccf authored by Eli Cohen's avatar Eli Cohen Committed by David S. Miller

net/mlx4_core: Fix backward compatibility on VFs

Commit 85743f1e ("net/mlx4_core: Set UAR page size to 4KB regardless
of system page size") introduced dependency where old VF drivers without
this fix fail to load if the PF driver runs with this commit.

To resolve this add a module parameter which disables that functionality
by default.  If both the PF and VFs are running with a driver with that
commit the administrator may set the module param to true.

The module parameter is called enable_4k_uar.

Fixes: 85743f1e ('net/mlx4_core: Set UAR page size to 4KB ...')
Signed-off-by: default avatarEli Cohen <eli@mellanox.com>
Tested-by: default avatarAlexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent e2ad1f97
...@@ -105,6 +105,11 @@ module_param(enable_64b_cqe_eqe, bool, 0444); ...@@ -105,6 +105,11 @@ module_param(enable_64b_cqe_eqe, bool, 0444);
MODULE_PARM_DESC(enable_64b_cqe_eqe, MODULE_PARM_DESC(enable_64b_cqe_eqe,
"Enable 64 byte CQEs/EQEs when the FW supports this (default: True)"); "Enable 64 byte CQEs/EQEs when the FW supports this (default: True)");
static bool enable_4k_uar;
module_param(enable_4k_uar, bool, 0444);
MODULE_PARM_DESC(enable_4k_uar,
"Enable using 4K UAR. Should not be enabled if have VFs which do not support 4K UARs (default: false)");
#define PF_CONTEXT_BEHAVIOUR_MASK (MLX4_FUNC_CAP_64B_EQE_CQE | \ #define PF_CONTEXT_BEHAVIOUR_MASK (MLX4_FUNC_CAP_64B_EQE_CQE | \
MLX4_FUNC_CAP_EQE_CQE_STRIDE | \ MLX4_FUNC_CAP_EQE_CQE_STRIDE | \
MLX4_FUNC_CAP_DMFS_A0_STATIC) MLX4_FUNC_CAP_DMFS_A0_STATIC)
...@@ -423,7 +428,11 @@ static int mlx4_dev_cap(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap) ...@@ -423,7 +428,11 @@ static int mlx4_dev_cap(struct mlx4_dev *dev, struct mlx4_dev_cap *dev_cap)
/* Virtual PCI function needs to determine UAR page size from /* Virtual PCI function needs to determine UAR page size from
* firmware. Only master PCI function can set the uar page size * firmware. Only master PCI function can set the uar page size
*/ */
if (enable_4k_uar)
dev->uar_page_shift = DEFAULT_UAR_PAGE_SHIFT; dev->uar_page_shift = DEFAULT_UAR_PAGE_SHIFT;
else
dev->uar_page_shift = PAGE_SHIFT;
mlx4_set_num_reserved_uars(dev, dev_cap); mlx4_set_num_reserved_uars(dev, dev_cap);
} }
...@@ -2233,11 +2242,14 @@ static int mlx4_init_hca(struct mlx4_dev *dev) ...@@ -2233,11 +2242,14 @@ static int mlx4_init_hca(struct mlx4_dev *dev)
dev->caps.max_fmr_maps = (1 << (32 - ilog2(dev->caps.num_mpts))) - 1; dev->caps.max_fmr_maps = (1 << (32 - ilog2(dev->caps.num_mpts))) - 1;
/* Always set UAR page size 4KB, set log_uar_sz accordingly */ if (enable_4k_uar) {
init_hca.log_uar_sz = ilog2(dev->caps.num_uars) + init_hca.log_uar_sz = ilog2(dev->caps.num_uars) +
PAGE_SHIFT - PAGE_SHIFT - DEFAULT_UAR_PAGE_SHIFT;
DEFAULT_UAR_PAGE_SHIFT;
init_hca.uar_page_sz = DEFAULT_UAR_PAGE_SHIFT - 12; init_hca.uar_page_sz = DEFAULT_UAR_PAGE_SHIFT - 12;
} else {
init_hca.log_uar_sz = ilog2(dev->caps.num_uars);
init_hca.uar_page_sz = PAGE_SHIFT - 12;
}
init_hca.mw_enabled = 0; init_hca.mw_enabled = 0;
if (dev->caps.flags & MLX4_DEV_CAP_FLAG_MEM_WINDOW || if (dev->caps.flags & MLX4_DEV_CAP_FLAG_MEM_WINDOW ||
......
Markdown is supported
0%
or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment