[PATCH] IB/core: Add generic function to extract IB speed from netdev

[PATCH] IB/core: Add generic function to extract IB speed from netdev

[Yuval Shaia]

Logic of retriving netdev speed from net_device and translating it to IB
speed is implemented both in rxe and bnxt drivers.

Define new function which merges both.

Signed-off-by: Yuval Shaia <yuval.shaia-QHcLZuEGTsvQT0dZR+AlfA@public.gmane.org>
---
Please note that this patch kills the following mail threads:
	* [PATCH] IB/bnxt_re: Check return value from get_link_ksettings
	* [PATCH 1/2] IB/rxe: Check return value from get_settings
	* [PATCH 2/2] IB/rxe: Protect call to get_link_ksettings with rtnl lock
---
 drivers/infiniband/core/verbs.c          | 52 ++++++++++++++++++++++++++++++++
 drivers/infiniband/hw/bnxt_re/ib_verbs.c | 48 ++---------------------------
 drivers/infiniband/sw/rxe/rxe_verbs.c    | 43 +-------------------------
 include/rdma/ib_verbs.h                  |  1 +
 4 files changed, 56 insertions(+), 88 deletions(-)

diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index 4792f52..de40434 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -1253,6 +1253,58 @@ int ib_resolve_eth_dmac(struct ib_device *device,
 }
 EXPORT_SYMBOL(ib_resolve_eth_dmac);
 
+void ib_get_speed(struct net_device *netdev, u8 *speed, u8 *width)
+{
+	int rc;
+	u32 netdev_speed = SPEED_UNKNOWN;
+
+	if (netdev->ethtool_ops->get_link_ksettings) {
+		struct ethtool_link_ksettings lksettings;
+
+		rtnl_lock();
+		rc = netdev->ethtool_ops->get_link_ksettings(netdev,
+							     &lksettings);
+		rtnl_unlock();
+
+		if (!rc)
+			netdev_speed = lksettings.base.speed;
+	} else if (netdev->ethtool_ops->get_settings) {
+		struct ethtool_cmd cmd;
+
+		rc = netdev->ethtool_ops->get_settings(netdev, &cmd);
+
+		if (!rc)
+			netdev_speed = cmd.speed;
+	}
+
+	if (netdev_speed == SPEED_UNKNOWN) {
+		netdev_speed = SPEED_1000;
+		pr_warn("%s speed is unknown, defaulting to %d\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;
+	}
+}
+EXPORT_SYMBOL(ib_get_speed);
+
 int ib_modify_qp(struct ib_qp *qp,
 		 struct ib_qp_attr *qp_attr,
 		 int qp_attr_mask)
diff --git a/drivers/infiniband/hw/bnxt_re/ib_verbs.c b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
index 7ba9e69..9a34c06 100644
--- a/drivers/infiniband/hw/bnxt_re/ib_verbs.c
+++ b/drivers/infiniband/hw/bnxt_re/ib_verbs.c
@@ -181,50 +181,6 @@ int bnxt_re_modify_device(struct ib_device *ibdev,
 	return 0;
 }
 
-static void __to_ib_speed_width(struct net_device *netdev, u8 *speed, u8 *width)
-{
-	struct ethtool_link_ksettings lksettings;
-	u32 espeed;
-
-	if (netdev->ethtool_ops && netdev->ethtool_ops->get_link_ksettings) {
-		memset(&lksettings, 0, sizeof(lksettings));
-		rtnl_lock();
-		netdev->ethtool_ops->get_link_ksettings(netdev, &lksettings);
-		rtnl_unlock();
-		espeed = lksettings.base.speed;
-	} else {
-		espeed = SPEED_UNKNOWN;
-	}
-	switch (espeed) {
-	case SPEED_1000:
-		*speed = IB_SPEED_SDR;
-		*width = IB_WIDTH_1X;
-		break;
-	case SPEED_10000:
-		*speed = IB_SPEED_QDR;
-		*width = IB_WIDTH_1X;
-		break;
-	case SPEED_20000:
-		*speed = IB_SPEED_DDR;
-		*width = IB_WIDTH_4X;
-		break;
-	case SPEED_25000:
-		*speed = IB_SPEED_EDR;
-		*width = IB_WIDTH_1X;
-		break;
-	case SPEED_40000:
-		*speed = IB_SPEED_QDR;
-		*width = IB_WIDTH_4X;
-		break;
-	case SPEED_50000:
-		break;
-	default:
-		*speed = IB_SPEED_SDR;
-		*width = IB_WIDTH_1X;
-		break;
-	}
-}
-
 /* Port */
 int bnxt_re_query_port(struct ib_device *ibdev, u8 port_num,
 		       struct ib_port_attr *port_attr)
@@ -266,8 +222,8 @@ int bnxt_re_query_port(struct ib_device *ibdev, u8 port_num,
 	 * IB stack to avoid race in the NETDEV_UNREG path
 	 */
 	if (test_bit(BNXT_RE_FLAG_IBDEV_REGISTERED, &rdev->flags))
-		__to_ib_speed_width(rdev->netdev, &port_attr->active_speed,
-				    &port_attr->active_width);
+		ib_get_speed(rdev->netdev, &port_attr->active_speed,
+			     &port_attr->active_width);
 	return 0;
 }
 
diff --git a/drivers/infiniband/sw/rxe/rxe_verbs.c b/drivers/infiniband/sw/rxe/rxe_verbs.c
index 83d709e..cdac9f2 100644
--- a/drivers/infiniband/sw/rxe/rxe_verbs.c
+++ b/drivers/infiniband/sw/rxe/rxe_verbs.c
@@ -51,36 +51,11 @@ static int rxe_query_device(struct ib_device *dev,
 	return 0;
 }
 
-static void rxe_eth_speed_to_ib_speed(int speed, u8 *active_speed,
-				      u8 *active_width)
-{
-	if (speed <= 1000) {
-		*active_width = IB_WIDTH_1X;
-		*active_speed = IB_SPEED_SDR;
-	} else if (speed <= 10000) {
-		*active_width = IB_WIDTH_1X;
-		*active_speed = IB_SPEED_FDR10;
-	} else if (speed <= 20000) {
-		*active_width = IB_WIDTH_4X;
-		*active_speed = IB_SPEED_DDR;
-	} else if (speed <= 30000) {
-		*active_width = IB_WIDTH_4X;
-		*active_speed = IB_SPEED_QDR;
-	} else if (speed <= 40000) {
-		*active_width = IB_WIDTH_4X;
-		*active_speed = IB_SPEED_FDR10;
-	} else {
-		*active_width = IB_WIDTH_4X;
-		*active_speed = IB_SPEED_EDR;
-	}
-}
-
 static int rxe_query_port(struct ib_device *dev,
 			  u8 port_num, struct ib_port_attr *attr)
 {
 	struct rxe_dev *rxe = to_rdev(dev);
 	struct rxe_port *port;
-	u32 speed;
 
 	if (unlikely(port_num != 1)) {
 		pr_warn("invalid port_number %d\n", port_num);
@@ -93,23 +68,7 @@ static int rxe_query_port(struct ib_device *dev,
 	*attr = port->attr;
 
 	mutex_lock(&rxe->usdev_lock);
-	if (rxe->ndev->ethtool_ops->get_link_ksettings) {
-		struct ethtool_link_ksettings ks;
-
-		rxe->ndev->ethtool_ops->get_link_ksettings(rxe->ndev, &ks);
-		speed = ks.base.speed;
-	} else if (rxe->ndev->ethtool_ops->get_settings) {
-		struct ethtool_cmd cmd;
-
-		rxe->ndev->ethtool_ops->get_settings(rxe->ndev, &cmd);
-		speed = cmd.speed;
-	} else {
-		pr_warn("%s speed is unknown, defaulting to 1000\n",
-			rxe->ndev->name);
-		speed = 1000;
-	}
-	rxe_eth_speed_to_ib_speed(speed, &attr->active_speed,
-				  &attr->active_width);
+	ib_get_speed(rxe->ndev, &attr->active_speed, &attr->active_width);
 	mutex_unlock(&rxe->usdev_lock);
 
 	return 0;
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index ba8314e..2c57f32 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -3488,6 +3488,7 @@ void ib_drain_qp(struct ib_qp *qp);
 
 int ib_resolve_eth_dmac(struct ib_device *device,
 			struct rdma_ah_attr *ah_attr);
+void ib_get_speed(struct net_device *netdev, u8 *speed, u8 *width);
 
 static inline u8 *rdma_ah_retrieve_dmac(struct rdma_ah_attr *attr)
 {
-- 
2.9.4

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Re: [PATCH] IB/core: Add generic function to extract IB speed from netdev

[Bart Van Assche]

On Tue, 2017-06-06 at 15:38 +0300, Yuval Shaia wrote:
> Logic of retriving netdev speed from net_device and translating it to IB
> speed is implemented both in rxe and bnxt drivers.

Hello Yuval,

Have you noticed that there is another copy of eth_speed_to_ib_speed() in
the usnic driver?

Bart.--
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Re: [PATCH] IB/core: Add generic function to extract IB speed from netdev

[Yuval Shaia]

On Tue, Jun 06, 2017 at 03:36:59PM +0000, Bart Van Assche wrote:
> On Tue, 2017-06-06 at 15:38 +0300, Yuval Shaia wrote:
> > Logic of retriving netdev speed from net_device and translating it to IB
> > speed is implemented both in rxe and bnxt drivers.
> 
> Hello Yuval,
> 
> Have you noticed that there is another copy of eth_speed_to_ib_speed() in
> the usnic driver?

Missed that one.
I will post v1 of the patch soon that utilize this new function in
usnic_ib_query_port.
Problem i see here is that usnic_ib_query_port directly call
__ethtool_get_link_ksettings and not via netdev->ethtool_ops. So asking
usnic folks to review and approve the change.

> 
> Bart.--
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> the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
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