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mlxsw: spectrum_buffers: Add ability to veto pool's configuration

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Subsequent patches are going to need to veto changes in certain pools'
size and / or threshold type (mode).

Add two fields to the pool's struct that indicate if either of these
attributes is allowed to change and enforce that.

Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Reviewed-by: Petr Machata <petrm@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2019-04-22 12:08:43 +00:00 committed by David S. Miller
parent 93d3668c02
commit 0636f4de79
1 changed files with 16 additions and 1 deletions
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17
drivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c
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@ -16,6 +16,8 @@
struct mlxsw_sp_sb_pr {
enum mlxsw_reg_sbpr_mode mode;
u32 size;
u8 freeze_mode:1,
freeze_size:1;
};
struct mlxsw_cp_sb_occ {
@ -932,14 +934,27 @@ int mlxsw_sp_sb_pool_set(struct mlxsw_core *mlxsw_core,
{
struct mlxsw_sp *mlxsw_sp = mlxsw_core_driver_priv(mlxsw_core);
u32 pool_size = mlxsw_sp_bytes_cells(mlxsw_sp, size);
const struct mlxsw_sp_sb_pr *pr;
enum mlxsw_reg_sbpr_mode mode;
mode = (enum mlxsw_reg_sbpr_mode) threshold_type;
pr = &mlxsw_sp->sb_vals->prs[pool_index];
if (size > MLXSW_CORE_RES_GET(mlxsw_sp->core, MAX_BUFFER_SIZE)) {
NL_SET_ERR_MSG_MOD(extack, "Exceeded shared buffer size");
return -EINVAL;
}
mode = (enum mlxsw_reg_sbpr_mode) threshold_type;
if (pr->freeze_mode && pr->mode != mode) {
NL_SET_ERR_MSG_MOD(extack, "Changing this pool's threshold type is forbidden");
return -EINVAL;
};
if (pr->freeze_size && pr->size != size) {
NL_SET_ERR_MSG_MOD(extack, "Changing this pool's size is forbidden");
return -EINVAL;
};
return mlxsw_sp_sb_pr_write(mlxsw_sp, pool_index, mode,
pool_size, false);
}