net/ice: add source prune option

Source prune is disabled by default to support VRRP advertisement
packets in a vsi of ice PF.  There is no way to enable source prune
itself.

This patch introduces devarg "source-prune" to allow user to enable
source prune. Enable Source Prune to automatically drop incoming packets
when their source MAC address matches one of the MAC addresses assigned
to that same NIC port.

Signed-off-by: Anurag Mandal <[email protected]>
Acked-by: Bruce Richardson <[email protected]>

Author: anuragma2025

doc/guides/nics/ice.rst

@@ -183,6 +183,17 @@ Runtime Configuration
   If the value provided is greater than the number of levels provided by the HW,
   SW will use the hardware maximum value.
 
+- ``Source Prune Enable`` (default ``0``)
+
+  Enable Source Prune to automatically drop incoming packets
+  when their source MAC address matches one of the MAC addresses
+  assigned to that same NIC port.
+
+  Source Prune can be enabled by setting the devargs parameter ``source-prune``,
+  for example::
+
+    -a 80:00.0,source-prune=1
+
 - ``Protocol extraction for per queue``
 
   Configure the RX queues to do protocol extraction into mbuf for protocol

drivers/net/intel/ice/ice_ethdev.c

@@ -41,6 +41,7 @@
 #define ICE_DDP_FILENAME_ARG      "ddp_pkg_file"
 #define ICE_DDP_LOAD_SCHED_ARG    "ddp_load_sched_topo"
 #define ICE_TM_LEVELS_ARG         "tm_sched_levels"
+#define ICE_SOURCE_PRUNE_ARG      "source-prune"
 #define ICE_LINK_STATE_ON_CLOSE   "link_state_on_close"
 
 #define ICE_CYCLECOUNTER_MASK  0xffffffffffffffffULL
@@ -58,6 +59,7 @@ static const char * const ice_valid_args[] = {
 	ICE_DDP_FILENAME_ARG,
 	ICE_DDP_LOAD_SCHED_ARG,
 	ICE_TM_LEVELS_ARG,
+	ICE_SOURCE_PRUNE_ARG,
 	ICE_LINK_STATE_ON_CLOSE,
 	NULL
 };
@@ -1718,6 +1720,7 @@ ice_setup_vsi(struct ice_pf *pf, enum ice_vsi_type type)
 	uint16_t max_txqs[ICE_MAX_TRAFFIC_CLASS] = { 0 };
 	uint8_t tc_bitmap = 0x1;
 	uint16_t cfg;
+	struct ice_adapter *ad = (struct ice_adapter *)hw->back;
 
 	/* hw->num_lports = 1 in NIC mode */
 	vsi = rte_zmalloc(NULL, sizeof(struct ice_vsi), 0);
@@ -1755,8 +1758,16 @@ ice_setup_vsi(struct ice_pf *pf, enum ice_vsi_type type)
 		 * by ice_init_hw
 		 */
 		vsi_ctx.info.sw_id = hw->port_info->sw_id;
-		vsi_ctx.info.sw_flags = ICE_AQ_VSI_SW_FLAG_LOCAL_LB;
-		vsi_ctx.info.sw_flags |= ICE_AQ_VSI_SW_FLAG_SRC_PRUNE;
+		/* Source Prune */
+		if (ad->devargs.source_prune != 1) {
+			/* Disable source prune to support VRRP
+			 * when source-prune devarg is not set
+			 */
+			vsi_ctx.info.sw_flags =
+				ICE_AQ_VSI_SW_FLAG_LOCAL_LB;
+			vsi_ctx.info.sw_flags |=
+				ICE_AQ_VSI_SW_FLAG_SRC_PRUNE;
+		}
 		cfg = ICE_AQ_VSI_PROP_SW_VALID;
 		vsi_ctx.info.valid_sections |= rte_cpu_to_le_16(cfg);
 		vsi_ctx.info.sw_flags2 = ICE_AQ_VSI_SW_FLAG_LAN_ENA;
@@ -2451,6 +2462,11 @@ static int ice_parse_devargs(struct rte_eth_dev *dev)
 	if (ret)
 		goto bail;
 
+	ret = rte_kvargs_process(kvlist, ICE_SOURCE_PRUNE_ARG,
+				 &parse_bool, &ad->devargs.source_prune);
+	if (ret)
+		goto bail;
+
 	ret = rte_kvargs_process(kvlist, ICE_LINK_STATE_ON_CLOSE,
 				 &parse_link_state_on_close, &ad->devargs.link_state_on_close);
 
@@ -7715,6 +7731,7 @@ RTE_PMD_REGISTER_PARAM_STRING(net_ice,
 			      ICE_DDP_FILENAME_ARG "=</path/to/file>"
 			      ICE_DDP_LOAD_SCHED_ARG "=<0|1>"
 			      ICE_TM_LEVELS_ARG "=<N>"
+			      ICE_SOURCE_PRUNE_ARG "=<0|1>"
 			      ICE_RX_LOW_LATENCY_ARG "=<0|1>"
 			      ICE_LINK_STATE_ON_CLOSE "=<down|up|initial>");
 

drivers/net/intel/ice/ice_ethdev.h

@@ -616,6 +616,7 @@ struct ice_devargs {
 	uint8_t pps_out_ena;
 	uint8_t ddp_load_sched;
 	uint8_t tm_exposed_levels;
+	uint8_t source_prune;
 	int link_state_on_close;
 	int xtr_field_offs;
 	uint8_t xtr_flag_offs[PROTO_XTR_MAX];