diff mbox series

[net-next,v2,6/6] sfc: extend pedit add action to handle decrement ipv6 hop limit

Message ID 20230824112842.47883-7-pieter.jansen-van-vuuren@amd.com (mailing list archive)
State Accepted
Commit e8e0bd60e4833e5bcfa220d7b4c07456c83c1ea2
Delegated to: Netdev Maintainers
Headers show
Series sfc: introduce eth, ipv4 and ipv6 pedit offloads | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1330 this patch: 1330
netdev/cc_maintainers success CCed 8 of 8 maintainers
netdev/build_clang success Errors and warnings before: 1353 this patch: 1353
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1353 this patch: 1353
netdev/checkpatch warning WARNING: line length of 82 exceeds 80 columns WARNING: line length of 92 exceeds 80 columns
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Pieter Jansen van Vuuren Aug. 24, 2023, 11:28 a.m. UTC 
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 <ecree.xilinx@gmail.com>
Signed-off-by: Edward Cree <ecree.xilinx@gmail.com>
Signed-off-by: Pieter Jansen van Vuuren <pieter.jansen-van-vuuren@amd.com>
---
 drivers/net/ethernet/sfc/tc.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)
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Patch

diff --git a/drivers/net/ethernet/sfc/tc.c b/drivers/net/ethernet/sfc/tc.c
index dfe3a8bf74f0..047322b04d4f 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;
 	}