Re: [dpdk-dev] [PATCH] net/i40e: i40e rework for ipn3ke

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

Hi, Xiaolong

OK, I will do this in V2.

Thanks.

-----Original Message-----
From: Ye, Xiaolong 
Sent: Wednesday, June 26, 2019 11:33 PM
To: Pei, Andy <andy.pei@intel.com>
Cc: dev@dpdk.org; Zhang, Roy Fan <roy.fan.zhang@intel.com>; Zhang, Qi Z <qi.z.zhang@intel.com>; Wu, Jingjing <jingjing.wu@intel.com>; Xing, Beilei <beilei.xing@intel.com>; Yigit, Ferruh <ferruh.yigit@intel.com>; Xu, Rosen <rosen.xu@intel.com>
Subject: Re: [dpdk-dev] [PATCH] net/i40e: i40e rework for ipn3ke

Hi, Andy

Better to use a more specific subject for this patch:

	net/i40e: get link status update for ipn3ke

or something similar.

On 05/23, Andy Pei wrote:
>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.
>
>Fixes: c60869e2b742 ("net/i40e: fix link status update")

For me, this patch is rather a new feature add than a fix.

>Cc: roy.fan.zhang@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


As Ferruh suggested, currently we don't need this cc info in git log history, you can move the cc block after `---` mark, while all those names will still be picked-up and cc'ed by git send-email.

>
>Signed-off-by: Andy Pei <andy.pei@intel.com>
>---
> drivers/net/i40e/i40e_ethdev.c | 128 
>+++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 122 insertions(+), 6 deletions(-)
>
>diff --git a/drivers/net/i40e/i40e_ethdev.c 
>b/drivers/net/i40e/i40e_ethdev.c index cab440f..9873ea0 100644
>--- a/drivers/net/i40e/i40e_ethdev.c
>+++ b/drivers/net/i40e/i40e_ethdev.c
>@@ -39,11 +39,12 @@
> #include "i40e_regs.h"
> #include "rte_pmd_i40e.h"
> 
>-#define ETH_I40E_FLOATING_VEB_ARG	"enable_floating_veb"
>-#define ETH_I40E_FLOATING_VEB_LIST_ARG	"floating_veb_list"
>-#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_FLOATING_VEB_ARG         "enable_floating_veb"
>+#define ETH_I40E_FLOATING_VEB_LIST_ARG    "floating_veb_list"
>+#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"

Above changes are not relevant.

>+#define ETH_I40E_SWITCH_MODE_ARG          "switch_mode"
> 
> #define I40E_CLEAR_PXE_WAIT_MS     200
> 
>@@ -410,6 +411,7 @@ 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[] = { @@ -2784,6 
>+2786,80 @@ 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);
>+

When will you free the memory alloced by strdup.

>+	if (!*(char **)extra_args)
>+		return -ENOMEM;
>+
>+	return 0;
>+}
>+
>+static void
>+i40e_pf_switch_mode_link_update(const char *cfg_str,
>+	struct rte_eth_dev **switch_ethdev)
>+{
>+	char switch_name[RTE_ETH_NAME_MAX_LEN] = {0};
>+	char port_name[RTE_ETH_NAME_MAX_LEN] = {0};
>+	char switch_ethdev_name[RTE_ETH_NAME_MAX_LEN] = {0};

Above initializations are not needed.

>+	uint16_t port_id;
>+	const char *p_src;
>+	char *p_dst;
>+	int ret = -1;

This initialization is not needed.

>+
>+	/* 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)
>+			*switch_ethdev = NULL;
>+		else
>+			*switch_ethdev = &rte_eth_devices[port_id];
>+	} else
>+		*switch_ethdev = NULL;

After read the body of this function, it's about getting a switch_ethdev by a name other than updating the link status, so the func name is confusing, better to use a more precise name, and return value can be struct *rte_eth_dev, then you wouldn't have to pass struct rte_eth_dev **.

>+}
>+
> int
> i40e_dev_link_update(struct rte_eth_dev *dev,
> 		     int wait_to_complete)
>@@ -2792,6 +2868,11 @@ void i40e_flex_payload_reg_set_default(struct i40e_hw *hw)
> 	struct rte_eth_link link;
> 	bool enable_lse = dev->data->dev_conf.intr_conf.lsc ? true : false;
> 	int ret;
>+	struct rte_devargs *devargs;
>+	struct rte_kvargs *kvlist = NULL;
>+	struct rte_pci_device *pci_dev = RTE_ETH_DEV_TO_PCI(dev);
>+	struct rte_eth_dev *switch_ethdev;
>+	char *switch_cfg_str = NULL;
> 
> 	memset(&link, 0, sizeof(link));
> 
>@@ -2805,6 +2886,40 @@ 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) {
>+		kvlist = rte_kvargs_parse(devargs->args, valid_keys);
>+		if (kvlist != NULL) {
>+			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)) {
>+
>+					i40e_pf_switch_mode_link_update(
>+						switch_cfg_str,
>+						&switch_ethdev);
>+
>+					if (switch_ethdev) {
>+						rte_eth_linkstatus_get(
>+							switch_ethdev,
>+							&link);
>+					} else {
>+						link.link_duplex =
>+							ETH_LINK_FULL_DUPLEX;
>+						link.link_autoneg =
>+							ETH_LINK_SPEED_FIXED;
>+						link.link_speed =
>+							ETH_SPEED_NUM_25G;
>+						link.link_status = 0;
>+					}
>+				}
>+			}
>+			rte_kvargs_free(kvlist);
>+		}
>+	}
>+

Better to wrap above code to a function to avoid too many levels of block nesting.

Thanks,
Xiaolong
> 	ret = rte_eth_linkstatus_set(dev, &link);
> 	i40e_notify_all_vfs_link_status(dev);
> 
>@@ -12790,4 +12905,5 @@ 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
>