Commit e8e0bd60 authored by Pieter Jansen van Vuuren's avatar Pieter Jansen van Vuuren Committed by David S. Miller
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sfc: extend pedit add action to handle decrement ipv6 hop limit 



Extend the pedit add actions to handle this case for ipv6. Similar to ipv4
dec ttl, decrementing ipv6 hop limit can be achieved by adding 0xff to the
hop limit field.

Co-developed-by: default avatarEdward Cree <ecree.xilinx@gmail.com>
Signed-off-by: default avatarEdward Cree <ecree.xilinx@gmail.com>
Signed-off-by: default avatarPieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 64848f06

drivers/net/ethernet/sfc/tc.c

+25 −0
Original line number Diff line number Diff line
@@ -1084,6 +1084,31 @@ static int efx_tc_pedit_add(struct efx_nic *efx, struct efx_tc_action_set *act, 
			break;

		}

		break;

	case FLOW_ACT_MANGLE_HDR_TYPE_IP6:

		switch (fa->mangle.offset) {

		case round_down(offsetof(struct ipv6hdr, hop_limit), 4):

			/* check that pedit applies to hoplimit only */

			if (fa->mangle.mask != EFX_TC_HDR_TYPE_HLIMIT_MASK)

				break;



			/* Adding 0xff is equivalent to decrementing the hoplimit.

			 * Other added values are not supported.

			 */

			if ((fa->mangle.val >> 24) != U8_MAX)

				break;



			/* check that we do not decrement hoplimit twice */

			if (!efx_tc_flower_action_order_ok(act,

							   EFX_TC_AO_DEC_TTL)) {

				NL_SET_ERR_MSG_MOD(extack, "Unsupported: multiple dec ttl");

				return -EOPNOTSUPP;

			}

			act->do_ttl_dec = 1;

			return 0;

		default:

			break;

		}

		break;

	default:

		break;

	}