Re: [dpdk-dev] [PATCH v5] net/mlx5: support new representor naming format

[Slava Ovsiienko <viacheslavo@mellanox.com>]

> -----Original Message-----
> From: dev <dev-bounces@dpdk.org> On Behalf Of Dekel Peled
> Sent: Sunday, March 17, 2019 8:23
> To: Yongseok Koh <yskoh@mellanox.com>; Shahaf Shuler
> <shahafs@mellanox.com>
> Cc: dev@dpdk.org; Ori Kam <orika@mellanox.com>; Dekel Peled
> <dekelp@mellanox.com>
> Subject: [dpdk-dev] [PATCH v5] net/mlx5: support new representor naming
> format
> 
> Kernel update [1] introduce new format of representors names.
> This patch implements RFC [2], updating MLX5 PMD to support the new
> format, while maintaining support of the existing format.
> 
> [1]
> https://eur03.safelinks.protection.outlook.com/?url=https%3A%2F%2Fgithub
> .com%2Ftorvalds%2Flinux%2Fcommit%2Fc12ecc2&amp;data=02%7C01%7Cvi
> acheslavo%40mellanox.com%7C17dec02b64014892fa4a08d6aaa12e04%7Ca
> 652971c7d2e4d9ba6a4d149256f461b%7C0%7C0%7C636884006586825444&a
> mp;sdata=YFOOhRcJ2qb19nRUA9aRUqHP8HChHLX7VP1tlWZ5OLk%3D&amp;
> reserved=0
> [2]
> https://eur03.safelinks.protection.outlook.com/?url=http%3A%2F%2Fmails.d
> pdk.org%2Farchives%2Fdev%2F2019-
> March%2F125676.html&amp;data=02%7C01%7Cviacheslavo%40mellanox.co
> m%7C17dec02b64014892fa4a08d6aaa12e04%7Ca652971c7d2e4d9ba6a4d14
> 9256f461b%7C0%7C0%7C636884006586825444&amp;sdata=EWWcj5GANyC
> 5nKdNaCuqUeRZmXIEgH4HHRbc52h5cto%3D&amp;reserved=0
> 
> Signed-off-by: Dekel Peled <dekelp@mellanox.com>
> 
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>

> ---
> v5: Add flag to indicate if rep. port name is in new format.
> v4: Remove redundant clear of errno.
> v3: Add utility function with common logic, call it from sysfs and nl.
> v2: Use public link to kernel patch, add link to RFC.
> ---
> ---
>  drivers/net/mlx5/mlx5.h        |  3 +++
>  drivers/net/mlx5/mlx5_ethdev.c | 54
> ++++++++++++++++++++++++++++++++++++++----
>  drivers/net/mlx5/mlx5_nl.c     | 11 ++++-----
>  3 files changed, 57 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h index
> 5384453..88ffb19 100644
> --- a/drivers/net/mlx5/mlx5.h
> +++ b/drivers/net/mlx5/mlx5.h
> @@ -60,6 +60,7 @@ enum {
>  struct mlx5_switch_info {
>  	uint32_t master:1; /**< Master device. */
>  	uint32_t representor:1; /**< Representor device. */
> +	uint32_t port_name_new:1; /**< Rep. port name is in new format.
> */
>  	int32_t port_name; /**< Representor port name. */
>  	uint64_t switch_id; /**< Switch identifier. */  }; @@ -300,6 +301,8
> @@ unsigned int mlx5_dev_to_port_id(const struct rte_device *dev,
>  				 unsigned int port_list_n);
>  int mlx5_sysfs_switch_info(unsigned int ifindex,
>  			   struct mlx5_switch_info *info);
> +bool mlx5_translate_port_name(const char *port_name_in,
> +			      struct mlx5_switch_info *port_info_out);
> 
>  /* mlx5_mac.c */
> 
> diff --git a/drivers/net/mlx5/mlx5_ethdev.c
> b/drivers/net/mlx5/mlx5_ethdev.c index 795c9c7..428a465 100644
> --- a/drivers/net/mlx5/mlx5_ethdev.c
> +++ b/drivers/net/mlx5/mlx5_ethdev.c
> @@ -1353,9 +1353,16 @@ int mlx5_fw_version_get(struct rte_eth_dev *dev,
> char *fw_ver, size_t fw_size)  mlx5_sysfs_switch_info(unsigned int ifindex,
> struct mlx5_switch_info *info)  {
>  	char ifname[IF_NAMESIZE];
> +	char port_name[IF_NAMESIZE];
>  	FILE *file;
>  	DIR *dir;
> -	struct mlx5_switch_info data = { .master = 0, };
> +	struct mlx5_switch_info data = {
> +		.master = 0,
> +		.representor = 0,
> +		.port_name_new = 0,
> +		.port_name = 0,
> +		.switch_id = 0,
> +	};
>  	bool port_name_set = false;
>  	bool port_switch_id_set = false;
>  	bool device_dir = false;
> @@ -1375,10 +1382,9 @@ int mlx5_fw_version_get(struct rte_eth_dev *dev,
> char *fw_ver, size_t fw_size)
> 
>  	file = fopen(phys_port_name, "rb");
>  	if (file != NULL) {
> -		port_name_set =
> -			fscanf(file, "%d%c", &data.port_name, &c) == 2 &&
> -			c == '\n';
> +		fscanf(file, "%s", port_name);
>  		fclose(file);
> +		port_name_set = mlx5_translate_port_name(port_name,
> &data);
>  	}
>  	file = fopen(phys_switch_id, "rb");
>  	if (file == NULL) {
> @@ -1399,3 +1405,43 @@ int mlx5_fw_version_get(struct rte_eth_dev *dev,
> char *fw_ver, size_t fw_size)
>  	*info = data;
>  	return 0;
>  }
> +
> +/**
> + * Extract port name, as a number, from sysfs or netlink information.
> + *
> + * @param[in] port_name_in
> + *   String representing the port name.
> + * @param[out] port_info_out
> + *   Port information, including port name as a number.
> + *
> + * @return
> + *   true on success, false otherwise.
> + */
> +bool
> +mlx5_translate_port_name(const char *port_name_in,
> +			 struct mlx5_switch_info *port_info_out) {
> +	char pf_c1, pf_c2, vf_c1, vf_c2;
> +	char *end;
> +	int32_t pf_num;
> +	bool port_name_set = false;
> +
> +	/*
> +	 * Check for port-name as a string of the form pf0vf0
> +	 * (support kernel ver >= 5.0)
> +	 */
> +	port_name_set =	(sscanf(port_name_in, "%c%c%d%c%c%d",
> &pf_c1, &pf_c2,
> +				&pf_num, &vf_c1, &vf_c2,
> +				&port_info_out->port_name) == 6);
> +	if (port_name_set) {
> +		port_info_out->port_name_new = 1;
> +	} else {
> +		/* Check for port-name as a number (support kernel ver <
> 5.0 */
> +		errno = 0;
> +		port_info_out->port_name = strtol(port_name_in, &end, 0);
> +		if (!errno &&
> +		    (size_t)(end - port_name_in) == strlen(port_name_in))
> +			port_name_set = true;
> +	}
> +	return port_name_set;
> +}
> diff --git a/drivers/net/mlx5/mlx5_nl.c b/drivers/net/mlx5/mlx5_nl.c index
> 0bf6845..cb34de3 100644
> --- a/drivers/net/mlx5/mlx5_nl.c
> +++ b/drivers/net/mlx5/mlx5_nl.c
> @@ -836,6 +836,7 @@ struct mlx5_nl_ifindex_data {
>  	struct mlx5_switch_info info = {
>  		.master = 0,
>  		.representor = 0,
> +		.port_name_new = 0,
>  		.port_name = 0,
>  		.switch_id = 0,
>  	};
> @@ -849,7 +850,6 @@ struct mlx5_nl_ifindex_data {
>  	while (off < nh->nlmsg_len) {
>  		struct rtattr *ra = (void *)((uintptr_t)nh + off);
>  		void *payload = RTA_DATA(ra);
> -		char *end;
>  		unsigned int i;
> 
>  		if (ra->rta_len > nh->nlmsg_len - off) @@ -859,12 +859,9 @@
> struct mlx5_nl_ifindex_data {
>  			num_vf_set = true;
>  			break;
>  		case IFLA_PHYS_PORT_NAME:
> -			errno = 0;
> -			info.port_name = strtol(payload, &end, 0);
> -			if (errno ||
> -			    (size_t)(end - (char *)payload) != strlen(payload))
> -				goto error;
> -			port_name_set = true;
> +			port_name_set =
> +				mlx5_translate_port_name((char *)payload,
> +							 &info);
>  			break;
>  		case IFLA_PHYS_SWITCH_ID:
>  			info.switch_id = 0;
> --
> 1.8.3.1