Re: [PATCH net-next 5/6] sfc: introduce pedit add actions on the ipv4 ttl field

[kernel test robot <lkp@intel.com>]

Hi Pieter,

kernel test robot noticed the following build warnings:

[auto build test WARNING on net-next/main]

url:    https://github.com/intel-lab-lkp/linux/commits/Pieter-Jansen-van-Vuuren/sfc-introduce-ethernet-pedit-set-action-infrastructure/20230823-192051
base:   net-next/main
patch link:    https://lore.kernel.org/r/20230823111725.28090-6-pieter.jansen-van-vuuren%40amd.com
patch subject: [PATCH net-next 5/6] sfc: introduce pedit add actions on the ipv4 ttl field
config: alpha-allyesconfig (https://download.01.org/0day-ci/archive/20230823/202308232244.jYYwKnlV-lkp@intel.com/config)
compiler: alpha-linux-gcc (GCC) 13.2.0
reproduce: (https://download.01.org/0day-ci/archive/20230823/202308232244.jYYwKnlV-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202308232244.jYYwKnlV-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> drivers/net/ethernet/sfc/tc.c:1073: warning: expecting prototype for efx_tc_mangle(). Prototype was for efx_tc_pedit_add() instead


vim +1073 drivers/net/ethernet/sfc/tc.c

  1056	
  1057	/**
  1058	 * efx_tc_mangle() - handle a single 32-bit (or less) pedit
  1059	 * @efx: NIC we're installing a flow rule on
  1060	 * @act: action set (cursor) to update
  1061	 * @fa:          FLOW_ACTION_MANGLE action metadata
  1062	 * @mung:        accumulator for partial mangles
  1063	 * @extack:      netlink extended ack for reporting errors
  1064	 *
  1065	 * Identify the fields written by a FLOW_ACTION_MANGLE, and record
  1066	 * the partial mangle state in @mung.  If this mangle completes an
  1067	 * earlier partial mangle, consume and apply to @act by calling
  1068	 * efx_tc_complete_mac_mangle().
  1069	 */
  1070	static int efx_tc_pedit_add(struct efx_nic *efx, struct efx_tc_action_set *act,
  1071				    const struct flow_action_entry *fa,
  1072				    struct netlink_ext_ack *extack)
> 1073	{
  1074		switch (fa->mangle.htype) {
  1075		case FLOW_ACT_MANGLE_HDR_TYPE_IP4:
  1076			switch (fa->mangle.offset) {
  1077			case offsetof(struct iphdr, ttl):
  1078				/* check that pedit applies to ttl only */
  1079				if (fa->mangle.mask != ~EFX_TC_HDR_TYPE_TTL_MASK)
  1080					break;
  1081	
  1082				/* Adding 0xff is equivalent to decrementing the ttl.
  1083				 * Other added values are not supported.
  1084				 */
  1085				if ((fa->mangle.val & EFX_TC_HDR_TYPE_TTL_MASK) != U8_MAX)
  1086					break;
  1087	
  1088				/* check that we do not decrement ttl twice */
  1089				if (!efx_tc_flower_action_order_ok(act,
  1090								   EFX_TC_AO_DEC_TTL)) {
  1091					NL_SET_ERR_MSG_MOD(extack, "Unsupported: multiple dec ttl");
  1092					return -EOPNOTSUPP;
  1093				}
  1094				act->do_ttl_dec = 1;
  1095				return 0;
  1096			default:
  1097				break;
  1098			}
  1099			break;
  1100		default:
  1101			break;
  1102		}
  1103	
  1104		NL_SET_ERR_MSG_FMT_MOD(extack,
  1105				       "Unsupported: ttl add action type %x %x %x/%x",
  1106				       fa->mangle.htype, fa->mangle.offset,
  1107				       fa->mangle.val, fa->mangle.mask);
  1108		return -EOPNOTSUPP;
  1109	}
  1110	

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