Commit 8ebabaa0 authored by Matan Barak's avatar Matan Barak Committed by Saeed Mahameed

net/mlx5: Convert linear search for free index to ida

When allocating a flow table entry, we need to allocate a free index
in the flow group. Currently, this is done by traversing the existing
flow table entries in the flow group, until a free index is found.
Replacing this by using a ida, which allows us to find a free index
much faster.
Signed-off-by: default avatarMatan Barak <matanb@mellanox.com>
Reviewed-by: default avatarMaor Gottlieb <maorg@mellanox.com>
Signed-off-by: default avatarSaeed Mahameed <saeedm@mellanox.com>
parent 09800305
......@@ -360,6 +360,7 @@ static void del_flow_table(struct fs_node *node)
err = mlx5_cmd_destroy_flow_table(dev, ft);
if (err)
mlx5_core_warn(dev, "flow steering can't destroy ft\n");
ida_destroy(&ft->fte_allocator);
fs_get_obj(prio, ft->node.parent);
prio->num_ft--;
}
......@@ -437,8 +438,8 @@ static void del_fte(struct fs_node *node)
"flow steering can't delete fte in index %d of flow group id %d\n",
fte->index, fg->id);
ida_simple_remove(&ft->fte_allocator, fte->index);
fte->status = 0;
fg->num_ftes--;
}
static void del_flow_group(struct fs_node *node)
......@@ -523,6 +524,7 @@ static struct mlx5_flow_table *alloc_flow_table(int level, u16 vport, int max_ft
ft->flags = flags;
INIT_LIST_HEAD(&ft->fwd_rules);
mutex_init(&ft->lock);
ida_init(&ft->fte_allocator);
return ft;
}
......@@ -839,6 +841,7 @@ static struct mlx5_flow_table *__mlx5_create_flow_table(struct mlx5_flow_namespa
destroy_ft:
mlx5_cmd_destroy_flow_table(root->dev, ft);
free_ft:
ida_destroy(&ft->fte_allocator);
kfree(ft);
unlock_root:
mutex_unlock(&root->chain_lock);
......@@ -1102,41 +1105,26 @@ add_rule_fte(struct fs_fte *fte,
return ERR_PTR(err);
}
/* Assumed fg is locked */
static unsigned int get_free_fte_index(struct mlx5_flow_group *fg,
struct list_head **prev)
{
struct fs_fte *fte;
unsigned int start = fg->start_index;
if (prev)
*prev = &fg->node.children;
/* assumed list is sorted by index */
fs_for_each_fte(fte, fg) {
if (fte->index != start)
return start;
start++;
if (prev)
*prev = &fte->node.list;
}
return start;
}
/* prev is output, prev->next = new_fte */
static struct fs_fte *create_fte(struct mlx5_flow_group *fg,
u32 *match_value,
struct mlx5_flow_act *flow_act,
struct list_head **prev)
struct mlx5_flow_act *flow_act)
{
struct mlx5_flow_table *ft;
struct fs_fte *fte;
int index;
index = get_free_fte_index(fg, prev);
fs_get_obj(ft, fg->node.parent);
index = ida_simple_get(&ft->fte_allocator, fg->start_index,
fg->start_index + fg->max_ftes,
GFP_KERNEL);
if (index < 0)
return ERR_PTR(index);
fte = alloc_fte(flow_act, match_value, index);
if (IS_ERR(fte))
if (IS_ERR(fte)) {
ida_simple_remove(&ft->fte_allocator, index);
return fte;
}
return fte;
}
......@@ -1234,7 +1222,6 @@ static struct mlx5_flow_handle *add_rule_fg(struct mlx5_flow_group *fg,
{
struct mlx5_flow_handle *handle;
struct mlx5_flow_table *ft;
struct list_head *prev;
struct fs_fte *fte;
int i;
......@@ -1267,12 +1254,8 @@ static struct mlx5_flow_handle *add_rule_fg(struct mlx5_flow_group *fg,
unlock_ref_node(&fte->node);
}
fs_get_obj(ft, fg->node.parent);
if (fg->num_ftes >= fg->max_ftes) {
handle = ERR_PTR(-ENOSPC);
goto unlock_fg;
}
fte = create_fte(fg, match_value, flow_act, &prev);
fte = create_fte(fg, match_value, flow_act);
if (IS_ERR(fte)) {
handle = (void *)fte;
goto unlock_fg;
......@@ -1286,10 +1269,9 @@ static struct mlx5_flow_handle *add_rule_fg(struct mlx5_flow_group *fg,
goto unlock_fg;
}
fg->num_ftes++;
tree_add_node(&fte->node, &fg->node);
list_add(&fte->node.list, prev);
/* fte list isn't sorted */
list_add_tail(&fte->node.list, &fg->node.children);
add_rules:
for (i = 0; i < handle->num_rules; i++) {
if (atomic_read(&handle->rule[i]->node.refcount) == 1)
......
......@@ -118,6 +118,7 @@ struct mlx5_flow_table {
/* FWD rules that point on this flow table */
struct list_head fwd_rules;
u32 flags;
struct ida fte_allocator;
};
struct mlx5_fc_cache {
......@@ -183,7 +184,6 @@ struct mlx5_flow_group {
struct mlx5_flow_group_mask mask;
u32 start_index;
u32 max_ftes;
u32 num_ftes;
u32 id;
};
......
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