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net/mlx5: Cap the maximum flow group size to 16M entries

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The maximum number of large flow groups applies to both small and large
tables. For very large tables (such as the 2G SW steering tables) this may
create a small number of flow groups each with an unrealistic entries
domain (> 16M).

Set the maximum number of large flow groups to at least what user
requested, but with a maximum per group size of 16M entries.
For software steering, if user requested less than 128 large flow
groups, it will gives us about 128 16M groups in a 2G
entries tables.

Signed-off-by: Paul Blakey <paulb@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
This commit is contained in:
Paul Blakey 2021-03-11 11:35:39 +02:00 committed by Saeed Mahameed
parent 9e11799840
commit 71513c05a9
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
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@ -1173,6 +1173,7 @@ mlx5_create_lag_demux_flow_table(struct mlx5_flow_namespace *ns,
}
EXPORT_SYMBOL(mlx5_create_lag_demux_flow_table);
#define MAX_FLOW_GROUP_SIZE BIT(24)
struct mlx5_flow_table*
mlx5_create_auto_grouped_flow_table(struct mlx5_flow_namespace *ns,
struct mlx5_flow_table_attr *ft_attr)
@ -1192,6 +1193,10 @@ mlx5_create_auto_grouped_flow_table(struct mlx5_flow_namespace *ns,
if (num_reserved_entries > ft->max_fte)
goto err_validate;
/* Align the number of groups according to the largest group size */
if (autogroups_max_fte / (max_num_groups + 1) > MAX_FLOW_GROUP_SIZE)
max_num_groups = (autogroups_max_fte / MAX_FLOW_GROUP_SIZE) - 1;
ft->autogroup.active = true;
ft->autogroup.required_groups = max_num_groups;
ft->autogroup.max_fte = autogroups_max_fte;