[dpdk-dev] [PATCH 5/5] net/sfc: support decrement IP TTL actions in transfer flows

[Ivan Malov <ivan.malov@oktetlabs.ru>]

These actions map to MAE action DECR_IP_TTL. It affects
the outermost header in the current processing state of
the packet, which might have been decapsulated by prior
action DECAP. It also updates IPv4 checksum accordingly.

Signed-off-by: Ivan Malov <ivan.malov@oktetlabs.ru>
Reviewed-by: Andrew Rybchenko <andrew.rybchenko@oktetlabs.ru>
Reviewed-by: Andy Moreton <amoreton@xilinx.com>
---
 doc/guides/nics/features/sfc.ini | 2 ++
 doc/guides/nics/sfc_efx.rst      | 4 ++++
 drivers/net/sfc/sfc_mae.c        | 8 ++++++++
 3 files changed, 14 insertions(+)

diff --git a/doc/guides/nics/features/sfc.ini b/doc/guides/nics/features/sfc.ini
index 0d785f4765..1ce2dc46ba 100644
--- a/doc/guides/nics/features/sfc.ini
+++ b/doc/guides/nics/features/sfc.ini
@@ -62,10 +62,12 @@ vxlan                = Y
 
 [rte_flow actions]
 count                = Y
+dec_ttl              = Y
 drop                 = Y
 flag                 = Y
 jump                 = P
 mark                 = Y
+of_dec_nw_ttl        = Y
 of_pop_vlan          = Y
 of_push_vlan         = Y
 of_set_vlan_pcp      = Y
diff --git a/doc/guides/nics/sfc_efx.rst b/doc/guides/nics/sfc_efx.rst
index 960e25bf98..00b95a4f58 100644
--- a/doc/guides/nics/sfc_efx.rst
+++ b/doc/guides/nics/sfc_efx.rst
@@ -234,6 +234,10 @@ Supported actions (***transfer*** rules):
 
 - OF_VLAN_SET_PCP
 
+- OF_DEC_NW_TTL
+
+- DEC_TTL
+
 - VXLAN_DECAP
 
 - VXLAN_ENCAP
diff --git a/drivers/net/sfc/sfc_mae.c b/drivers/net/sfc/sfc_mae.c
index 411f2ac27e..93cce60a3e 100644
--- a/drivers/net/sfc/sfc_mae.c
+++ b/drivers/net/sfc/sfc_mae.c
@@ -3587,6 +3587,14 @@ sfc_mae_rule_parse_action(struct sfc_adapter *sa,
 				       bundle->actions_mask);
 		rc = efx_mae_action_set_populate_vlan_pop(spec);
 		break;
+	case RTE_FLOW_ACTION_TYPE_OF_DEC_NW_TTL:
+	case RTE_FLOW_ACTION_TYPE_DEC_TTL:
+		SFC_BUILD_SET_OVERFLOW(RTE_FLOW_ACTION_TYPE_OF_DEC_NW_TTL,
+				       bundle->actions_mask);
+		SFC_BUILD_SET_OVERFLOW(RTE_FLOW_ACTION_TYPE_DEC_TTL,
+				       bundle->actions_mask);
+		rc = efx_mae_action_set_populate_decr_ip_ttl(spec);
+		break;
 	case RTE_FLOW_ACTION_TYPE_OF_PUSH_VLAN:
 		SFC_BUILD_SET_OVERFLOW(RTE_FLOW_ACTION_TYPE_OF_PUSH_VLAN,
 				       bundle->actions_mask);
-- 
2.30.2