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mlxsw: spectrum_acl: Avoid warning after identical rules insertion 

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: c22291f7cf ("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>
This commit is contained in:
Jiri Pirko 2019-05-29 10:59:44 +03:00 committed by David S. Miller
parent 84b3fd1fc9
commit ef74422020
1 changed files with 5 additions and 6 deletions
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11
drivers/net/ethernet/mellanox/mlxsw/spectrum_acl_erp.c
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@ -1171,13 +1171,12 @@ mlxsw_sp_acl_erp_delta_fill(const struct mlxsw_sp_acl_erp_key *parent_key,
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)];