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net/mlx4_core: Fix backward compatibility on VFs 

Commit 85743f1eb3 ("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: 85743f1eb3 ('net/mlx4_core: Set UAR page size to 4KB ...')
Signed-off-by: Eli Cohen <eli@mellanox.com>
Tested-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eli Cohen 2016-03-17 18:49:42 +02:00 committed by David S. Miller
parent e2ad1f976b
commit 76e39ccf9c
1 changed files with 18 additions and 6 deletions
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24
drivers/net/ethernet/mellanox/mlx4/main.c
View File

@ -105,6 +105,11 @@ module_param(enable_64b_cqe_eqe, bool, 0444);
MODULE_PARM_DESC(enable_64b_cqe_eqe,
"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 | \
MLX4_FUNC_CAP_EQE_CQE_STRIDE | \
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)
/* Virtual PCI function needs to determine UAR page size from
* firmware. Only master PCI function can set the uar page size
*/
dev->uar_page_shift = DEFAULT_UAR_PAGE_SHIFT;
if (enable_4k_uar)
dev->uar_page_shift = DEFAULT_UAR_PAGE_SHIFT;
else
dev->uar_page_shift = PAGE_SHIFT;
mlx4_set_num_reserved_uars(dev, dev_cap);
}
@ -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;
/* Always set UAR page size 4KB, set log_uar_sz accordingly */
init_hca.log_uar_sz = ilog2(dev->caps.num_uars) +
PAGE_SHIFT -
DEFAULT_UAR_PAGE_SHIFT;
init_hca.uar_page_sz = DEFAULT_UAR_PAGE_SHIFT - 12;
if (enable_4k_uar) {
init_hca.log_uar_sz = ilog2(dev->caps.num_uars) +
PAGE_SHIFT - DEFAULT_UAR_PAGE_SHIFT;
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;
if (dev->caps.flags & MLX4_DEV_CAP_FLAG_MEM_WINDOW ||