[dpdk-dev] [RFC] ethdev: improve link speed to string

["Min Hu (Connor)" <humin29@huawei.com>]

Currently, link speed to string only supports specific speeds, like 10M,
100M, 1G etc.

This patch expands support for any link speed which is over 1M and one
decimal place will kept for display at most.

Signed-off-by: Min Hu (Connor) <humin29@huawei.com>
---
 lib/ethdev/rte_ethdev.c | 34 +++++++++++++++++-----------------
 1 file changed, 17 insertions(+), 17 deletions(-)

diff --git a/lib/ethdev/rte_ethdev.c b/lib/ethdev/rte_ethdev.c
index daf5ca9242..1d3b960305 100644
--- a/lib/ethdev/rte_ethdev.c
+++ b/lib/ethdev/rte_ethdev.c
@@ -2750,24 +2750,24 @@ rte_eth_link_get_nowait(uint16_t port_id, struct rte_eth_link *eth_link)
 const char *
 rte_eth_link_speed_to_str(uint32_t link_speed)
 {
-	switch (link_speed) {
-	case ETH_SPEED_NUM_NONE: return "None";
-	case ETH_SPEED_NUM_10M:  return "10 Mbps";
-	case ETH_SPEED_NUM_100M: return "100 Mbps";
-	case ETH_SPEED_NUM_1G:   return "1 Gbps";
-	case ETH_SPEED_NUM_2_5G: return "2.5 Gbps";
-	case ETH_SPEED_NUM_5G:   return "5 Gbps";
-	case ETH_SPEED_NUM_10G:  return "10 Gbps";
-	case ETH_SPEED_NUM_20G:  return "20 Gbps";
-	case ETH_SPEED_NUM_25G:  return "25 Gbps";
-	case ETH_SPEED_NUM_40G:  return "40 Gbps";
-	case ETH_SPEED_NUM_50G:  return "50 Gbps";
-	case ETH_SPEED_NUM_56G:  return "56 Gbps";
-	case ETH_SPEED_NUM_100G: return "100 Gbps";
-	case ETH_SPEED_NUM_200G: return "200 Gbps";
-	case ETH_SPEED_NUM_UNKNOWN: return "Unknown";
-	default: return "Invalid";
+#define SPEED_STRING_LEN 16
+	static char name[SPEED_STRING_LEN];
+
+	if (link_speed == ETH_SPEED_NUM_NONE)
+		return "None";
+	if (link_speed == ETH_SPEED_NUM_UNKNOWN)
+		return "Unknown";
+	if (link_speed < ETH_SPEED_NUM_1G) {
+		snprintf(name, sizeof(name), "%u Mbps", link_speed);
+	} else if (link_speed % ETH_SPEED_NUM_1G != 0) {
+		snprintf(name, sizeof(name), "%.1f Gbps",
+		(double)link_speed / ETH_SPEED_NUM_1G);
+	} else {
+		snprintf(name, sizeof(name), "%u Gbps",
+		link_speed / ETH_SPEED_NUM_1G);
 	}
+
+	return (const char *)name;
 }
 
 int
-- 
2.33.0