net/mvpp2: support forwarding bad packets

Extend the config file with option to forward packets
that were marked as "l2 bad pkts".
By default the driver drop those packets

Signed-off-by: Dana Vardi <danat@marvell.com>
Reviewed-by: Liron Himi <lironh@marvell.com>

doc/guides/nics/mvpp2.rst

@@ -217,6 +217,7 @@ Configuration syntax
 
    [port <portnum> default]
    start_hdr = <start_hdr>
+   forward_bad_frames = <forward_bad_frames>
    default_tc = <default_tc>
    mapping_priority = <mapping_priority>
 
@@ -263,6 +264,8 @@ Where:
 
 - ``<start_hdr>``: Indicate what is the start header mode (`none` (eth), `dsa`, `ext_dsa` or `custom`).
 
+- ``<forward_bad_frames>``: Indicate whether to forward or drop l2 bad packets (0 or 1).
+
 - ``<default_tc>``: Default traffic class (e.g. 0)
 
 - ``<mapping_priority>``: QoS priority for mapping (`ip`, `vlan`, `ip/vlan` or `vlan/ip`).

drivers/net/mvpp2/mrvl_ethdev.c

@@ -813,9 +813,14 @@ mrvl_dev_start(struct rte_eth_dev *dev)
 		 priv->pp_id, priv->ppio_id);
 	priv->ppio_params.match = match;
 	priv->ppio_params.eth_start_hdr = PP2_PPIO_HDR_ETH;
-	if (mrvl_cfg)
+	priv->forward_bad_frames = 0;
+
+	if (mrvl_cfg) {
 		priv->ppio_params.eth_start_hdr =
 			mrvl_cfg->port[dev->data->port_id].eth_start_hdr;
+		priv->forward_bad_frames =
+			mrvl_cfg->port[dev->data->port_id].forward_bad_frames;
+	}
 
 	/*
 	 * Calculate the minimum bpool size for refill feature as follows:
@@ -2622,7 +2627,8 @@ mrvl_rx_pkt_burst(void *rxq, struct rte_mbuf **rx_pkts, uint16_t nb_pkts)
 
 		/* drop packet in case of mac, overrun or resource error */
 		status = pp2_ppio_inq_desc_get_l2_pkt_error(&descs[i]);
-		if (unlikely(status != PP2_DESC_ERR_OK)) {
+		if ((unlikely(status != PP2_DESC_ERR_OK)) &&
+			!(q->priv->forward_bad_frames)) {
 			struct pp2_buff_inf binf = {
 				.addr = rte_mbuf_data_iova_default(mbuf),
 				.cookie = (uint64_t)mbuf,

drivers/net/mvpp2/mrvl_ethdev.h

@@ -181,6 +181,8 @@ struct mrvl_priv {
 	LIST_HEAD(shaper_profiles, mrvl_tm_shaper_profile) shaper_profiles;
 	LIST_HEAD(nodes, mrvl_tm_node) nodes;
 	uint64_t rate_max;
+
+	uint8_t forward_bad_frames;
 };
 
 /** Flow operations forward declaration. */

drivers/net/mvpp2/mrvl_qos.c

@@ -76,6 +76,8 @@
 #define MRVL_TOK_PARSER_UDF_PROTO_UDP "udp"
 #define MRVL_TOK_PARSER_UDF_FIELD_UDP_DPORT "dport"
 
+/* parser forward bad frames tokens */
+#define MRVL_TOK_FWD_BAD_FRAMES "forward_bad_frames"
 
 /** Number of tokens in range a-b = 2. */
 #define MAX_RNG_TOKENS 2
@@ -872,6 +874,21 @@ mrvl_get_cfg(const char *key __rte_unused, const char *path, void *extra_args)
 				return -1;
 			}
 		}
+
+		/* Parse forward bad frames option */
+		entry = rte_cfgfile_get_entry(file, sec_name,
+				MRVL_TOK_FWD_BAD_FRAMES);
+		if (entry) {
+			if (get_val_securely(entry, &val) < 0) {
+				MRVL_LOG(ERR,
+					"Error in parsing %s value (%s)!\n",
+					MRVL_TOK_FWD_BAD_FRAMES, entry);
+				return -1;
+			}
+			(*cfg)->port[n].forward_bad_frames = (uint8_t)val;
+		} else {
+			(*cfg)->port[n].forward_bad_frames = 0;
+		}
 	}
 
 	return 0;

drivers/net/mvpp2/mrvl_qos.h

@@ -48,6 +48,7 @@ struct mrvl_cfg {
 		uint8_t use_global_defaults;
 		struct pp2_cls_plcr_params policer_params;
 		uint8_t setup_policer;
+		uint8_t forward_bad_frames;
 	} port[RTE_MAX_ETHPORTS];
 };