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net/mlx5: Allow creating autogroups with reserved entries 

Exclude the last n entries for an autogrouped flow table.

Reserving entries at the end of the FT will ensure that this FG will be
the last to be evaluated. This will be used in the next patch to create
a miss group enabling custom actions on FT miss.

Signed-off-by: Paul Blakey <paulb@mellanox.com>
Reviewed-by: Roi Dayan <roid@mellanox.com>
Reviewed-by: Oz Shlomo <ozsh@mellanox.com>
Reviewed-by: Mark Bloch <markb@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
This commit is contained in:
Paul Blakey 2019-11-14 17:02:59 +02:00 committed by Saeed Mahameed
parent ff189b4356
commit 79cdb0aaea
3 changed files with 19 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
drivers/net/ethernet/mellanox/mlx5/core/fs_core.c
View File

@ -579,7 +579,9 @@ static void del_sw_flow_group(struct fs_node *node)
rhashtable_destroy(&fg->ftes_hash);
ida_destroy(&fg->fte_allocator);
if (ft->autogroup.active && fg->max_ftes == ft->autogroup.group_size)
if (ft->autogroup.active &&
fg->max_ftes == ft->autogroup.group_size &&
fg->start_index < ft->autogroup.max_fte)
ft->autogroup.num_groups--;
err = rhltable_remove(&ft->fgs_hash,
&fg->hash,
@ -1121,9 +1123,14 @@ struct mlx5_flow_table*
mlx5_create_auto_grouped_flow_table(struct mlx5_flow_namespace *ns,
struct mlx5_flow_table_attr *ft_attr)
{
int num_reserved_entries = ft_attr->autogroup.num_reserved_entries;
int autogroups_max_fte = ft_attr->max_fte - num_reserved_entries;
int max_num_groups = ft_attr->autogroup.max_num_groups;
struct mlx5_flow_table *ft;
if (ft_attr->autogroup.max_num_groups > ft_attr->max_fte)
if (max_num_groups > autogroups_max_fte)
return ERR_PTR(-EINVAL);
if (num_reserved_entries > ft_attr->max_fte)
return ERR_PTR(-EINVAL);
ft = mlx5_create_flow_table(ns, ft_attr);
@ -1131,10 +1138,10 @@ mlx5_create_auto_grouped_flow_table(struct mlx5_flow_namespace *ns,
return ft;
ft->autogroup.active = true;
ft->autogroup.required_groups = ft_attr->autogroup.max_num_groups;
ft->autogroup.required_groups = max_num_groups;
ft->autogroup.max_fte = autogroups_max_fte;
/* We save place for flow groups in addition to max types */
ft->autogroup.group_size = ft->max_fte /
(ft->autogroup.required_groups + 1);
ft->autogroup.group_size = autogroups_max_fte / (max_num_groups + 1);
return ft;
}
@ -1156,7 +1163,7 @@ struct mlx5_flow_group *mlx5_create_flow_group(struct mlx5_flow_table *ft,
struct mlx5_flow_group *fg;
int err;
if (ft->autogroup.active)
if (ft->autogroup.active && start_index < ft->autogroup.max_fte)
return ERR_PTR(-EPERM);
down_write_ref_node(&ft->node, false);
@ -1329,9 +1336,10 @@ static struct mlx5_flow_group *alloc_auto_flow_group(struct mlx5_flow_table *ft
const struct mlx5_flow_spec *spec)
{
struct list_head *prev = &ft->node.children;
struct mlx5_flow_group *fg;
u32 max_fte = ft->autogroup.max_fte;
unsigned int candidate_index = 0;
unsigned int group_size = 0;
struct mlx5_flow_group *fg;
if (!ft->autogroup.active)
return ERR_PTR(-ENOENT);
@ -1339,7 +1347,7 @@ static struct mlx5_flow_group *alloc_auto_flow_group(struct mlx5_flow_table *ft
if (ft->autogroup.num_groups < ft->autogroup.required_groups)
group_size = ft->autogroup.group_size;
/* ft->max_fte == ft->autogroup.max_types */
/* max_fte == ft->autogroup.max_types */
if (group_size == 0)
group_size = 1;
@ -1352,7 +1360,7 @@ static struct mlx5_flow_group *alloc_auto_flow_group(struct mlx5_flow_table *ft
prev = &fg->node.list;
}
if (candidate_index + group_size > ft->max_fte)
if (candidate_index + group_size > max_fte)
return ERR_PTR(-ENOSPC);
fg = alloc_insert_flow_group(ft,

1
drivers/net/ethernet/mellanox/mlx5/core/fs_core.h
View File

@ -164,6 +164,7 @@ struct mlx5_flow_table {
unsigned int required_groups;
unsigned int group_size;
unsigned int num_groups;
unsigned int max_fte;
} autogroup;
/* Protect fwd_rules */
struct mutex lock;

1
include/linux/mlx5/fs.h
View File

@ -155,6 +155,7 @@ struct mlx5_flow_table_attr {
struct {
int max_num_groups;
int num_reserved_entries;
} autogroup;
};