[PATCH v1 14/20] net/ntnic: add handling exception path option

[Serhii Iliushyk <sil-plv@napatech.com>]

Enable exception path for unmatched packets to go through queue 0.

Signed-off-by: Serhii Iliushyk <sil-plv@napatech.com>
---
 doc/guides/nics/ntnic.rst        |  9 +++++++++
 drivers/net/ntnic/ntnic_ethdev.c | 21 +++++++++++++++++++++
 2 files changed, 30 insertions(+)

diff --git a/doc/guides/nics/ntnic.rst b/doc/guides/nics/ntnic.rst
index 5375d89a2d..01b6dca652 100644
--- a/doc/guides/nics/ntnic.rst
+++ b/doc/guides/nics/ntnic.rst
@@ -136,6 +136,15 @@ Multiple arguments for the same device are separated by ‘,’ comma.
 
    By default, the value is set to 1.
 
+``exception_path`` parameter [int]
+
+   Enable exception path for unmatched packets to go through queue 0.
+
+   To enable exception_path::
+
+      -a <domain>:<bus>:00.0,exception_path=1
+
+   By default, the value is set to 0.
 
 Logging and Debugging
 ---------------------
diff --git a/drivers/net/ntnic/ntnic_ethdev.c b/drivers/net/ntnic/ntnic_ethdev.c
index 01b3fe00ef..29508888a3 100644
--- a/drivers/net/ntnic/ntnic_ethdev.c
+++ b/drivers/net/ntnic/ntnic_ethdev.c
@@ -73,11 +73,13 @@ uint64_t rte_tsc_freq;
 #define ETH_DEV_NTNIC_HELP_ARG "help"
 #define ETH_DEV_NTHW_RXQUEUES_ARG "rxqs"
 #define ETH_DEV_NTHW_TXQUEUES_ARG "txqs"
+#define ETH_DEV_NTHW_EXCEPTION_PATH_ARG "exception_path"
 
 static const char *const valid_arguments[] = {
 	ETH_DEV_NTNIC_HELP_ARG,
 	ETH_DEV_NTHW_RXQUEUES_ARG,
 	ETH_DEV_NTHW_TXQUEUES_ARG,
+	ETH_DEV_NTHW_EXCEPTION_PATH_ARG,
 	NULL,
 };
 
@@ -2260,6 +2262,25 @@ nthw_pci_dev_init(struct rte_pci_device *pci_dev)
 			NT_LOG_DBGX(DBG, NTNIC, "devargs: %s=%u",
 				ETH_DEV_NTHW_TXQUEUES_ARG, nb_tx_queues);
 		}
+
+		kvargs_count = rte_kvargs_count(kvlist, ETH_DEV_NTHW_EXCEPTION_PATH_ARG);
+
+		if (kvargs_count != 0) {
+			assert(kvargs_count == 1);
+			res = rte_kvargs_process(kvlist, ETH_DEV_NTHW_EXCEPTION_PATH_ARG,
+					&nthw_string_to_u32, &exception_path);
+
+			if (res < 0) {
+				NT_LOG_DBGX(ERR, NTNIC,
+					"problem with command line arguments: res=%d", res);
+				return -1;
+			}
+
+			NT_LOG_DBGX(DBG, NTNIC, "devargs: %s=%u",
+				ETH_DEV_NTHW_EXCEPTION_PATH_ARG, exception_path);
+		}
+
+		rte_kvargs_free(kvlist);
 	}
 
 
-- 
2.45.0