[v7] net/i40e: i40e get link status update from ipn3ke

diff --git a/doc/guides/nics/i40e.rst b/doc/guides/nics/i40e.rst
index a97484c..8d88f0d 100644
--- a/doc/guides/nics/i40e.rst
+++ b/doc/guides/nics/i40e.rst
@@ -513,6 +513,17 @@  details please refer to :doc:`../testpmd_app_ug/index`.
    testpmd> set port (port_id) queue-region flush (on|off)
    testpmd> show port (port_id) queue-region
 
+Switch Mode
+~~~~~~~~~~~~~~~~~~~~~~~~~~~
+The Intel® Ethernet 700 Series can be component of IPN3KE device, in which the
+Intel® Ethernet 700 Series is connected to other pci device. This pci device
+works as switch device via which the Intel® Ethernet 700 Series get link status
+from. For example: the Intel® Ethernet 700 Series 0000:b1:00.0 is connected to
+an IPN3KE device whose BDF is b3:00.0. In this case 0000:b1:00.0 use representor
+0 on b3:00.0.
+
+   ./x86_64-native-linuxapp-gcc/app/testpmd -c 0x3 -n 4 -w 0000:b1:00.0,switch_mode=IPN3KE_0@b3:00.0_0
+
 Limitations or Known issues
 ---------------------------
 
diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 2b9fc45..4b5f0bb 100644
--- a/drivers/net/i40e/i40e_ethdev.c
+++ b/drivers/net/i40e/i40e_ethdev.c
@@ -44,6 +44,7 @@ 
 #define ETH_I40E_SUPPORT_MULTI_DRIVER	"support-multi-driver"
 #define ETH_I40E_QUEUE_NUM_PER_VF_ARG	"queue-num-per-vf"
 #define ETH_I40E_USE_LATEST_VEC	"use-latest-supported-vec"
+#define ETH_I40E_SWITCH_MODE_ARG	"switch_mode"
 
 #define I40E_CLEAR_PXE_WAIT_MS     200
 
@@ -406,6 +407,7 @@  static int i40e_sw_tunnel_filter_insert(struct i40e_pf *pf,
 	ETH_I40E_SUPPORT_MULTI_DRIVER,
 	ETH_I40E_QUEUE_NUM_PER_VF_ARG,
 	ETH_I40E_USE_LATEST_VEC,
+	ETH_I40E_SWITCH_MODE_ARG,
 	NULL};
 
 static const struct rte_pci_id pci_id_i40e_map[] = {
@@ -1260,6 +1262,115 @@  static inline void i40e_config_automask(struct i40e_pf *pf)
 #define I40E_ALARM_INTERVAL 50000 /* us */
 
 static int
+i40e_pf_parse_switch_mode(const char *key __rte_unused,
+	const char *value, void *extra_args)
+{
+	if (!value || !extra_args)
+		return -EINVAL;
+
+	if (strlen(value) < RTE_ETH_NAME_MAX_LEN) {
+		rte_memcpy(extra_args, value, strlen(value) + 1);
+	} else {
+		PMD_DRV_LOG(ERR,
+			"switch_mode args should be less than %d characters",
+			RTE_ETH_NAME_MAX_LEN);
+		return -EINVAL;
+	}
+	return 0;
+}
+
+static struct rte_eth_dev *
+i40e_eth_dev_get_by_switch_mode_name(const char *cfg_str)
+{
+	char switch_name[RTE_ETH_NAME_MAX_LEN];
+	char port_name[RTE_ETH_NAME_MAX_LEN];
+	char switch_ethdev_name[RTE_ETH_NAME_MAX_LEN];
+	uint16_t port_id;
+	const char *p_src;
+	char *p_dst;
+	int ret;
+
+	/* An example of cfg_str is "IPN3KE_0@b3:00.0_0" */
+	if (!strncmp(cfg_str, "IPN3KE", strlen("IPN3KE"))) {
+		p_src = cfg_str;
+		PMD_DRV_LOG(DEBUG, "cfg_str is %s", cfg_str);
+
+		/* move over "IPN3KE" */
+		while ((*p_src != '_') && (*p_src))
+			p_src++;
+
+		/* move over the first underline */
+		p_src++;
+
+		p_dst = switch_name;
+		while ((*p_src != '_') && (*p_src)) {
+			if (*p_src == '@') {
+				*p_dst++ = '|';
+				p_src++;
+			} else {
+				*p_dst++ = *p_src++;
+			}
+		}
+		*p_dst = 0;
+		PMD_DRV_LOG(DEBUG, "switch_name is %s", switch_name);
+
+		/* move over the second underline */
+		p_src++;
+
+		p_dst = port_name;
+		while (*p_src)
+			*p_dst++ = *p_src++;
+		*p_dst = 0;
+		PMD_DRV_LOG(DEBUG, "port_name is %s", port_name);
+
+		snprintf(switch_ethdev_name, sizeof(switch_ethdev_name),
+			"net_%s_representor_%s", switch_name, port_name);
+		PMD_DRV_LOG(DEBUG, "switch_ethdev_name is %s",
+			switch_ethdev_name);
+
+		ret = rte_eth_dev_get_port_by_name(switch_ethdev_name,
+			&port_id);
+		if (!ret)
+			return &rte_eth_devices[port_id];
+	}
+
+	return NULL;
+}
+
+static void
+eth_i40e_pf_switch_dev_init(struct rte_eth_dev *dev)
+{
+	char switch_cfg_str[RTE_ETH_NAME_MAX_LEN];
+	struct rte_kvargs *kvlist = NULL;
+	struct rte_devargs *devargs;
+	struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
+	struct i40e_pf *pf = I40E_DEV_PRIVATE_TO_PF(dev->data->dev_private);
+
+	pf->switch_ethdev_support_flag = 0;
+	pf->switch_ethdev = NULL;
+
+	devargs = pci_dev->device.devargs;
+	if (!devargs)
+		return;
+
+	kvlist = rte_kvargs_parse(devargs->args, valid_keys);
+	if (kvlist) {
+		if (rte_kvargs_count(kvlist, ETH_I40E_SWITCH_MODE_ARG) == 1) {
+			pf->switch_ethdev_support_flag = 1;
+
+			if (!rte_kvargs_process(kvlist,
+				ETH_I40E_SWITCH_MODE_ARG,
+				&i40e_pf_parse_switch_mode, switch_cfg_str)) {
+				pf->switch_ethdev =
+					i40e_eth_dev_get_by_switch_mode_name
+					(switch_cfg_str);
+			}
+		}
+		rte_kvargs_free(kvlist);
+	}
+}
+
+static int
 eth_i40e_dev_init(struct rte_eth_dev *dev, void *init_params __rte_unused)
 {
 	struct rte_pci_device *pci_dev;
@@ -1582,6 +1693,11 @@  static inline void i40e_config_automask(struct i40e_pf *pf)
 	memset(&pf->rss_info, 0,
 		sizeof(struct i40e_rte_flow_rss_conf));
 
+	/* parse the switch device from devargs, try to bind to the switch
+	 * device, if binding not succeed, bind again when i40e_dev_link_update
+	 */
+	eth_i40e_pf_switch_dev_init(dev);
+
 	/* reset all stats of the device, including pf and main vsi */
 	i40e_dev_stats_reset(dev);
 
@@ -2779,13 +2895,52 @@  void i40e_flex_payload_reg_set_default(struct i40e_hw *hw)
 	}
 }
 
+static void
+i40e_pf_linkstatus_get_from_switch_ethdev
+(struct rte_eth_dev *switch_ethdev, struct rte_eth_link *link)
+{
+	if (switch_ethdev) {
+		rte_eth_linkstatus_get(switch_ethdev, link);
+	} else {
+		link->link_autoneg = ETH_LINK_SPEED_FIXED;
+		link->link_duplex  = ETH_LINK_FULL_DUPLEX;
+		link->link_speed   = ETH_SPEED_NUM_25G;
+		link->link_status  = 0;
+	}
+}
+
+static struct rte_eth_dev *
+i40e_get_switch_ethdev_from_devargs(struct rte_devargs *devargs)
+{
+	struct rte_kvargs *kvlist = NULL;
+	struct rte_eth_dev *switch_ethdev = NULL;
+	char switch_cfg_str[RTE_ETH_NAME_MAX_LEN];
+
+	kvlist = rte_kvargs_parse(devargs->args, valid_keys);
+	if (kvlist) {
+		if (rte_kvargs_count(kvlist, ETH_I40E_SWITCH_MODE_ARG) == 1) {
+			if (!rte_kvargs_process(kvlist,
+				ETH_I40E_SWITCH_MODE_ARG,
+				&i40e_pf_parse_switch_mode, switch_cfg_str)) {
+				switch_ethdev =
+					i40e_eth_dev_get_by_switch_mode_name
+					(switch_cfg_str);
+			}
+		}
+		rte_kvargs_free(kvlist);
+	}
+	return switch_ethdev;
+}
+
 int
 i40e_dev_link_update(struct rte_eth_dev *dev,
 		     int wait_to_complete)
 {
 	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(dev->data->dev_private);
+	struct i40e_pf *pf = I40E_DEV_PRIVATE_TO_PF(dev->data->dev_private);
 	struct rte_eth_link link;
 	bool enable_lse = dev->data->dev_conf.intr_conf.lsc ? true : false;
+	struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
 	int ret;
 
 	memset(&link, 0, sizeof(link));
@@ -2800,6 +2955,14 @@  void i40e_flex_payload_reg_set_default(struct i40e_hw *hw)
 	else
 		update_link_aq(hw, &link, enable_lse, wait_to_complete);
 
+	if (pf->switch_ethdev_support_flag) {
+		if (!pf->switch_ethdev)
+			pf->switch_ethdev = i40e_get_switch_ethdev_from_devargs
+				(pci_dev->device.devargs);
+		i40e_pf_linkstatus_get_from_switch_ethdev(pf->switch_ethdev,
+			&link);
+	}
+
 	ret = rte_eth_linkstatus_set(dev, &link);
 	i40e_notify_all_vfs_link_status(dev);
 
@@ -12773,4 +12936,5 @@  struct i40e_customized_pctype*
 			      ETH_I40E_FLOATING_VEB_LIST_ARG "=<string>"
 			      ETH_I40E_QUEUE_NUM_PER_VF_ARG "=1|2|4|8|16"
 			      ETH_I40E_SUPPORT_MULTI_DRIVER "=1"
-			      ETH_I40E_USE_LATEST_VEC "=0|1");
+			      ETH_I40E_USE_LATEST_VEC "=0|1"
+			      ETH_I40E_SWITCH_MODE_ARG "=IPN3KE");
diff --git a/drivers/net/i40e/i40e_ethdev.h b/drivers/net/i40e/i40e_ethdev.h
index 38ac3ea..cfdcecb 100644
--- a/drivers/net/i40e/i40e_ethdev.h
+++ b/drivers/net/i40e/i40e_ethdev.h
@@ -975,6 +975,12 @@  struct i40e_pf {
 	struct i40e_customized_pctype customized_pctype[I40E_CUSTOMIZED_MAX];
 	/* Switch Domain Id */
 	uint16_t switch_domain_id;
+
+	/* flag indicating if switch mode is required like other devargs */
+	bool switch_ethdev_support_flag;
+
+	/* point to switch_ethdev specific by "switch_mode" in devargs */
+	struct rte_eth_dev *switch_ethdev;
 };
 
 enum pending_msg {