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net/mlx5: SF, Improve performance in SF allocation

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Avoid second traversal on the SF table by recording the first free entry
and using it in case the looked up entry was not found in the table.

Signed-off-by: Eli Cohen <elic@nvidia.com>
Signed-off-by: Parav Pandit <parav@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
This commit is contained in:
Eli Cohen 2021-04-26 09:58:55 +03:00 committed by Saeed Mahameed
parent 6cdc686aa3
commit 5bd8cee2b9
1 changed files with 13 additions and 10 deletions
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23
drivers/net/ethernet/mellanox/mlx5/core/sf/hw_table.c
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@ -73,26 +73,29 @@ static int mlx5_sf_hw_table_id_alloc(struct mlx5_sf_hw_table *table, u32 control
u32 usr_sfnum)
{
struct mlx5_sf_hwc_table *hwc;
int free_idx = -1;
int i;
hwc = mlx5_sf_controller_to_hwc(table->dev, controller);
if (!hwc->sfs)
return -ENOSPC;
/* Check if sf with same sfnum already exists or not. */
for (i = 0; i < hwc->max_fn; i++) {
if (!hwc->sfs[i].allocated && free_idx == -1) {
free_idx = i;
continue;
}
if (hwc->sfs[i].allocated && hwc->sfs[i].usr_sfnum == usr_sfnum)
return -EEXIST;
}
/* Find the free entry and allocate the entry from the array */
for (i = 0; i < hwc->max_fn; i++) {
if (!hwc->sfs[i].allocated) {
hwc->sfs[i].usr_sfnum = usr_sfnum;
hwc->sfs[i].allocated = true;
return i;
}
}
return -ENOSPC;
if (free_idx == -1)
return -ENOSPC;
hwc->sfs[free_idx].usr_sfnum = usr_sfnum;
hwc->sfs[free_idx].allocated = true;
return free_idx;
}
static void mlx5_sf_hw_table_id_free(struct mlx5_sf_hw_table *table, u32 controller, int id)