[dpdk-dev] [PATCH v2] net/i40e: i40e get link status update from ipn3ke

[Andy Pei <andy.pei@intel.com>]

Add switch_mode argument for i40e PF to specify the specific FPGA that
i40e PF is connected to. i40e PF get link status update via the
connected FPGA.

Signed-off-by: Andy Pei <andy.pei@intel.com>
---
Cc: qi.z.zhang@intel.com
Cc: jingjing.wu@intel.com
Cc: beilei.xing@intel.com
Cc: ferruh.yigit@intel.com
Cc: rosen.xu@intel.com
Cc: xiaolong.ye@intel.com
Cc: roy.fan.zhang@intel.com
Cc: stable@dpdk.org

v2:
* use a more specific subject for this patch.
* delete modifications that are not relevant.
* free memory allocted by strdup.
* delete unnecessary initializations.
* name function more precisely.
* wrap relevant code to a function to avoid too many levels of block
  nesting.

 drivers/net/i40e/i40e_ethdev.c | 121 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 120 insertions(+), 1 deletion(-)

diff --git a/drivers/net/i40e/i40e_ethdev.c b/drivers/net/i40e/i40e_ethdev.c
index 3364455..abf95aa 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[] = {
@@ -2778,6 +2780,116 @@ void i40e_flex_payload_reg_set_default(struct i40e_hw *hw)
 	}
 }
 
+static int
+i40e_pf_parse_switch_mode(const char *key __rte_unused,
+	const char *value, void *extra_args)
+{
+	if (!value || !extra_args)
+		return -EINVAL;
+
+	*(char **)extra_args = strdup(value);
+
+	if (!*(char **)extra_args)
+		return -ENOMEM;
+
+	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 NULL;
+		else
+			return &rte_eth_devices[port_id];
+	} else
+		return NULL;
+}
+
+static void
+i40e_pf_linkstatus_get_from_switch_ethdev
+(struct rte_devargs *devargs, struct rte_eth_link *link)
+{
+	struct rte_kvargs *kvlist = NULL;
+	struct rte_eth_dev *switch_ethdev;
+	char *switch_cfg_str = NULL;
+
+	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_free(switch_cfg_str);
+
+				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;
+				}
+			}
+		}
+		rte_kvargs_free(kvlist);
+	}
+}
+
 int
 i40e_dev_link_update(struct rte_eth_dev *dev,
 		     int wait_to_complete)
@@ -2785,6 +2897,8 @@ void i40e_flex_payload_reg_set_default(struct i40e_hw *hw)
 	struct i40e_hw *hw = I40E_DEV_PRIVATE_TO_HW(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);
+	struct rte_devargs *devargs;
 	int ret;
 
 	memset(&link, 0, sizeof(link));
@@ -2799,6 +2913,10 @@ void i40e_flex_payload_reg_set_default(struct i40e_hw *hw)
 	else
 		update_link_aq(hw, &link, enable_lse, wait_to_complete);
 
+	devargs = pci_dev->device.devargs;
+	if (devargs)
+		i40e_pf_linkstatus_get_from_switch_ethdev(devargs, &link);
+
 	ret = rte_eth_linkstatus_set(dev, &link);
 	i40e_notify_all_vfs_link_status(dev);
 
@@ -12772,4 +12890,5 @@ 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");
-- 
1.8.3.1