[dpdk-dev] [PATCH v2] net/mlx5: support new representors' naming format

[Dekel Peled <dekelp@mellanox.com>]

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

---
v2: Use public link to kernel patch, add link to RFC.
---

Signed-off-by: Dekel Peled <dekelp@mellanox.com>
---
 drivers/net/mlx5/mlx5_ethdev.c | 14 +++++++++++++-
 drivers/net/mlx5/mlx5_nl.c     | 20 +++++++++++++++-----
 2 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/drivers/net/mlx5/mlx5_ethdev.c b/drivers/net/mlx5/mlx5_ethdev.c
index 795c9c7..664f485 100644
--- a/drivers/net/mlx5/mlx5_ethdev.c
+++ b/drivers/net/mlx5/mlx5_ethdev.c
@@ -1359,7 +1359,8 @@ int mlx5_fw_version_get(struct rte_eth_dev *dev, char *fw_ver, size_t fw_size)
 	bool port_name_set = false;
 	bool port_switch_id_set = false;
 	bool device_dir = false;
-	char c;
+	char c, pf_c1, pf_c2, vf_c1, vf_c2;
+	int32_t pf_num;
 
 	if (!if_indextoname(ifindex, ifname)) {
 		rte_errno = errno;
@@ -1375,9 +1376,20 @@ 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) {
+		/* Check for port-name as a number (support kernel ver < 5.0 */
 		port_name_set =
 			fscanf(file, "%d%c", &data.port_name, &c) == 2 &&
 			c == '\n';
+		if (!port_name_set) {
+			/*
+			 * Check for port-name as a string of the form pf0vf0
+			 * (support kernel ver >= 5.0)
+			 */
+			port_name_set = (fscanf(file, "%c%c%d%c%c%d%c", &pf_c1,
+						&pf_c2, &pf_num, &vf_c1, &vf_c2,
+						&data.port_name, &c) == 7) &&
+					c == '\n';
+		}
 		fclose(file);
 	}
 	file = fopen(phys_switch_id, "rb");
diff --git a/drivers/net/mlx5/mlx5_nl.c b/drivers/net/mlx5/mlx5_nl.c
index 0bf6845..cc7b4b8 100644
--- a/drivers/net/mlx5/mlx5_nl.c
+++ b/drivers/net/mlx5/mlx5_nl.c
@@ -849,7 +849,7 @@ 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;
+		char *end, *vf_str;
 		unsigned int i;
 
 		if (ra->rta_len > nh->nlmsg_len - off)
@@ -861,10 +861,20 @@ struct mlx5_nl_ifindex_data {
 		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;
+			if (errno || ((size_t)(end - (char *)payload) !=
+				      strlen(payload))) {
+				vf_str = strstr(payload, "vf");
+				if (vf_str) {
+					errno = 0;
+					info.port_name = strtol(vf_str + 2,
+								&end, 0);
+					port_name_set = true;
+				}
+				if (errno)
+					goto error;
+			} else {
+				port_name_set = true;
+			}
 			break;
 		case IFLA_PHYS_SWITCH_ID:
 			info.switch_id = 0;
-- 
1.8.3.1