[PATCH v4 for-next] RDMA/core: Get IB width and speed from netdev

[Junxian Huang]

From: Haoyue Xu <xuhaoyue1@xxxxxxxxxxxxx>

Previously, there was no way to query the number of lanes for a network
card, so the same netdev_speed would result in a fixed pair of width and
speed. As network card specifications become more diverse, such fixed
mode is no longer suitable, so a method is needed to obtain the correct
width and speed based on the number of lanes.

This patch retrieves netdev lanes and speed from net_device and
translates them to IB width and speed.

Signed-off-by: Haoyue Xu <xuhaoyue1@xxxxxxxxxxxxx>
Signed-off-by: Luoyouming <luoyouming@xxxxxxxxxx>
Signed-off-by: Junxian Huang <huangjunxian6@xxxxxxxxxxxxx>
---
 drivers/infiniband/core/verbs.c | 100 +++++++++++++++++++++++++-------
 1 file changed, 79 insertions(+), 21 deletions(-)

diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index b99b3cc283b6..25367bd6dd97 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -1880,6 +1880,80 @@ int ib_modify_qp_with_udata(struct ib_qp *ib_qp, struct ib_qp_attr *attr,
 }
 EXPORT_SYMBOL(ib_modify_qp_with_udata);
 
+static void ib_get_width_and_speed(u32 netdev_speed, u32 lanes,
+				   u16 *speed, u8 *width)
+{
+	if (!lanes) {
+		if (netdev_speed <= SPEED_1000) {
+			*width = IB_WIDTH_1X;
+			*speed = IB_SPEED_SDR;
+		} else if (netdev_speed <= SPEED_10000) {
+			*width = IB_WIDTH_1X;
+			*speed = IB_SPEED_FDR10;
+		} else if (netdev_speed <= SPEED_20000) {
+			*width = IB_WIDTH_4X;
+			*speed = IB_SPEED_DDR;
+		} else if (netdev_speed <= SPEED_25000) {
+			*width = IB_WIDTH_1X;
+			*speed = IB_SPEED_EDR;
+		} else if (netdev_speed <= SPEED_40000) {
+			*width = IB_WIDTH_4X;
+			*speed = IB_SPEED_FDR10;
+		} else {
+			*width = IB_WIDTH_4X;
+			*speed = IB_SPEED_EDR;
+		}
+
+		return;
+	}
+
+	switch (lanes) {
+	case 1:
+		*width = IB_WIDTH_1X;
+		break;
+	case 2:
+		*width = IB_WIDTH_2X;
+		break;
+	case 4:
+		*width = IB_WIDTH_4X;
+		break;
+	case 8:
+		*width = IB_WIDTH_8X;
+		break;
+	case 12:
+		*width = IB_WIDTH_12X;
+		break;
+	default:
+		*width = IB_WIDTH_1X;
+	}
+
+	switch (netdev_speed / lanes) {
+	case SPEED_2500:
+		*speed = IB_SPEED_SDR;
+		break;
+	case SPEED_5000:
+		*speed = IB_SPEED_DDR;
+		break;
+	case SPEED_10000:
+		*speed = IB_SPEED_FDR10;
+		break;
+	case SPEED_14000:
+		*speed = IB_SPEED_FDR;
+		break;
+	case SPEED_25000:
+		*speed = IB_SPEED_EDR;
+		break;
+	case SPEED_50000:
+		*speed = IB_SPEED_HDR;
+		break;
+	case SPEED_100000:
+		*speed = IB_SPEED_NDR;
+		break;
+	default:
+		*speed = IB_SPEED_SDR;
+	}
+}
+
 int ib_get_eth_speed(struct ib_device *dev, u32 port_num, u16 *speed, u8 *width)
 {
 	int rc;
@@ -1904,29 +1978,13 @@ int ib_get_eth_speed(struct ib_device *dev, u32 port_num, u16 *speed, u8 *width)
 		netdev_speed = lksettings.base.speed;
 	} else {
 		netdev_speed = SPEED_1000;
-		pr_warn("%s speed is unknown, defaulting to %u\n", netdev->name,
-			netdev_speed);
+		if (rc)
+			pr_warn("%s speed is unknown, defaulting to %u\n",
+				netdev->name, netdev_speed);
 	}
 
-	if (netdev_speed <= SPEED_1000) {
-		*width = IB_WIDTH_1X;
-		*speed = IB_SPEED_SDR;
-	} else if (netdev_speed <= SPEED_10000) {
-		*width = IB_WIDTH_1X;
-		*speed = IB_SPEED_FDR10;
-	} else if (netdev_speed <= SPEED_20000) {
-		*width = IB_WIDTH_4X;
-		*speed = IB_SPEED_DDR;
-	} else if (netdev_speed <= SPEED_25000) {
-		*width = IB_WIDTH_1X;
-		*speed = IB_SPEED_EDR;
-	} else if (netdev_speed <= SPEED_40000) {
-		*width = IB_WIDTH_4X;
-		*speed = IB_SPEED_FDR10;
-	} else {
-		*width = IB_WIDTH_4X;
-		*speed = IB_SPEED_EDR;
-	}
+	ib_get_width_and_speed(netdev_speed, lksettings.lanes,
+			       speed, width);
 
 	return 0;
 }
-- 
2.30.0