From: Jiri Pirko jiri@mellanox.com
[ Upstream commit ef74422020aa8c224b00a927e3e47faac4d8fae3 ]
When identical rules are inserted, the latter one goes to C-TCAM. For that, a second eRP with the same mask is created. These 2 eRPs by the nature cannot be merged and also one cannot be parent of another. Teach mlxsw_sp_acl_erp_delta_fill() about this possibility and handle it gracefully.
Reported-by: Alex Kushnarov alexanderk@mellanox.com Fixes: c22291f7cf45 ("mlxsw: spectrum: acl: Implement delta for ERP") Signed-off-by: Jiri Pirko jiri@mellanox.com Signed-off-by: Ido Schimmel idosch@mellanox.com Signed-off-by: David S. Miller davem@davemloft.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_erp.c | 11 +++++------ 1 file changed, 5 insertions(+), 6 deletions(-)
--- a/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_erp.c +++ b/drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_erp.c @@ -1171,13 +1171,12 @@ mlxsw_sp_acl_erp_delta_fill(const struct return -EINVAL; } if (si == -1) { - /* The masks are the same, this cannot happen. - * That means the caller is broken. + /* The masks are the same, this can happen in case eRPs with + * the same mask were created in both A-TCAM and C-TCAM. + * The only possible condition under which this can happen + * is identical rule insertion. Delta is not possible here. */ - WARN_ON(1); - *delta_start = 0; - *delta_mask = 0; - return 0; + return -EINVAL; } pmask = (unsigned char) parent_key->mask[__MASK_IDX(si)]; mask = (unsigned char) key->mask[__MASK_IDX(si)];