From e8e0bd60e4833e5bcfa220d7b4c07456c83c1ea2 Mon Sep 17 00:00:00 2001 From: Pieter Jansen van Vuuren Date: Thu, 24 Aug 2023 12:28:42 +0100 Subject: [PATCH] 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: Edward Cree Signed-off-by: Edward Cree Signed-off-by: Pieter Jansen van Vuuren Signed-off-by: David S. Miller --- drivers/net/ethernet/sfc/tc.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/drivers/net/ethernet/sfc/tc.c b/drivers/net/ethernet/sfc/tc.c index dfe3a8b..047322b 100644 --- a/drivers/net/ethernet/sfc/tc.c +++ b/drivers/net/ethernet/sfc/tc.c @@ -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; } -- 2.7.4