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X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR11MB6721 X-OriginatorOrg: intel.com Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Arnd Bergmann Date: Tue, 14 Feb 2023 16:25:36 +0100 > From: Arnd Bergmann > > With older compilers like gcc-9, the calculation of the vlan > priority field causes a false-positive warning from the byteswap: > > In file included from drivers/net/ethernet/intel/ice/ice_tc_lib.c:4: > drivers/net/ethernet/intel/ice/ice_tc_lib.c: In function 'ice_parse_cls_flower': > include/uapi/linux/swab.h:15:15: error: integer overflow in expression '(int)(short unsigned int)((int)match.key->..vlan_priority << 13) & 57344 & 255' of type 'int' results in '0' [-Werror=overflow] > 15 | (((__u16)(x) & (__u16)0x00ffU) << 8) | \ > | ~~~~~~~~~~~~^~~~~~~~~~~~~~~~~ > include/uapi/linux/swab.h:106:2: note: in expansion of macro '___constant_swab16' > 106 | ___constant_swab16(x) : \ > | ^~~~~~~~~~~~~~~~~~ > include/uapi/linux/byteorder/little_endian.h:42:43: note: in expansion of macro '__swab16' > 42 | #define __cpu_to_be16(x) ((__force __be16)__swab16((x))) > | ^~~~~~~~ > include/linux/byteorder/generic.h:96:21: note: in expansion of macro '__cpu_to_be16' > 96 | #define cpu_to_be16 __cpu_to_be16 > | ^~~~~~~~~~~~~ > drivers/net/ethernet/intel/ice/ice_tc_lib.c:1458:5: note: in expansion of macro 'cpu_to_be16' > 1458 | cpu_to_be16((match.key->vlan_priority << > | ^~~~~~~~~~~ > > After a change to be16_encode_bits(), the code becomes more > readable to both people and compilers, which avoids the warning. > > Fixes: 34800178b302 ("ice: Add support for VLAN priority filters in switchdev") > Suggested-by: Alexander Lobakin > Signed-off-by: Arnd Bergmann > --- > v2: use be16_encode_bits() instead of a temporary variable. > --- > drivers/net/ethernet/intel/ice/ice_tc_lib.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/net/ethernet/intel/ice/ice_tc_lib.c b/drivers/net/ethernet/intel/ice/ice_tc_lib.c > index 6b48cbc049c6..76f29a5bf8d7 100644 > --- a/drivers/net/ethernet/intel/ice/ice_tc_lib.c > +++ b/drivers/net/ethernet/intel/ice/ice_tc_lib.c > @@ -1455,8 +1455,8 @@ ice_parse_cls_flower(struct net_device *filter_dev, struct ice_vsi *vsi, > if (match.mask->vlan_priority) { > fltr->flags |= ICE_TC_FLWR_FIELD_VLAN_PRIO; > headers->vlan_hdr.vlan_prio = > - cpu_to_be16((match.key->vlan_priority << > - VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK); > + be16_encode_bits(match.key->vlan_priority, > + VLAN_PRIO_MASK); > } > > if (match.mask->vlan_tpid) > @@ -1489,8 +1489,8 @@ ice_parse_cls_flower(struct net_device *filter_dev, struct ice_vsi *vsi, > if (match.mask->vlan_priority) { > fltr->flags |= ICE_TC_FLWR_FIELD_CVLAN_PRIO; > headers->cvlan_hdr.vlan_prio = > - cpu_to_be16((match.key->vlan_priority << > - VLAN_PRIO_SHIFT) & VLAN_PRIO_MASK); > + be16_encode_bits(match.key->vlan_priority, > + VLAN_PRIO_MASK); Oh, the patch looks great! Both fixes the issue and cleans up the code a little bit. Reviewed-by: Alexander Lobakin > } > } > Thanks! Olek