From: Dekel Peled <dekelp@mellanox.com>
Date: Sun, 17 Mar 2019 06:23:03 +0000 (+0200)
Subject: net/mlx5: support new representor naming format
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=b2f3a3810125;p=dpdk.git

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://github.com/torvalds/linux/commit/c12ecc2
[2] http://mails.dpdk.org/archives/dev/2019-March/125676.html

Signed-off-by: Dekel Peled <dekelp@mellanox.com>
Acked-by: Viacheslav Ovsiienko <viacheslavo@mellanox.com>
Acked-by: Shahaf Shuler <shahafs@mellanox.com>
---

diff --git a/drivers/net/mlx5/mlx5.h b/drivers/net/mlx5/mlx5.h
index 5384453670..88ffb19247 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 f84f7cf69b..84d761c8e9 100644
--- a/drivers/net/mlx5/mlx5_ethdev.c
+++ b/drivers/net/mlx5/mlx5_ethdev.c
@@ -1353,8 +1353,15 @@ int
 mlx5_sysfs_switch_info(unsigned int ifindex, struct mlx5_switch_info *info)
 {
 	char ifname[IF_NAMESIZE];
+	char port_name[IF_NAMESIZE];
 	FILE *file;
-	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;
 	char c;
@@ -1371,10 +1378,9 @@ mlx5_sysfs_switch_info(unsigned int ifindex, struct mlx5_switch_info *info)
 
 	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) {
@@ -1390,3 +1396,43 @@ mlx5_sysfs_switch_info(unsigned int ifindex, struct mlx5_switch_info *info)
 	*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 fe5a27461e..8a10109f9b 100644
--- a/drivers/net/mlx5/mlx5_nl.c
+++ b/drivers/net/mlx5/mlx5_nl.c
@@ -830,6 +830,7 @@ mlx5_nl_switch_info_cb(struct nlmsghdr *nh, void *arg)
 	struct mlx5_switch_info info = {
 		.master = 0,
 		.representor = 0,
+		.port_name_new = 0,
 		.port_name = 0,
 		.switch_id = 0,
 	};
@@ -842,19 +843,15 @@ mlx5_nl_switch_info_cb(struct nlmsghdr *nh, void *arg)
 	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)
 			goto error;
 		switch (ra->rta_type) {
 		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;