netdev - [PATCH rdma-next 06/10] IB/core: Add helper to convert port attributes to data rate

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Message-ID: <20251218-vf-bw-lag-mode-v1-6-7d8ed4368bea@nvidia.com>
Date: Thu, 18 Dec 2025 17:58:32 +0200
From: Edward Srouji <edwards@...dia.com>
To: <edwards@...dia.com>, Leon Romanovsky <leon@...nel.org>, Saeed Mahameed
	<saeedm@...dia.com>, Tariq Toukan <tariqt@...dia.com>, Mark Bloch
	<mbloch@...dia.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David S. Miller"
	<davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski
	<kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, Jason Gunthorpe
	<jgg@...pe.ca>
CC: <netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Or Har-Toov <ohartoov@...dia.com>
Subject: [PATCH rdma-next 06/10] IB/core: Add helper to convert port attributes to data rate

From: Or Har-Toov <ohartoov@...dia.com>

Introduce ib_port_attr_to_rate() to compute the data rate in 100 Mbps
units (deci-Gb/sec) from a port's active_speed and active_width
attributes. This generic helper removes duplicated speed-to-rate
calculations, which are used by sysfs and the upcoming new verb.

Signed-off-by: Or Har-Toov <ohartoov@...dia.com>
Reviewed-by: Mark Bloch <mbloch@...dia.com>
Signed-off-by: Edward Srouji <edwards@...dia.com>
---
 drivers/infiniband/core/verbs.c | 51 +++++++++++++++++++++++++++++++++++++++++
 include/rdma/ib_verbs.h         | 14 +++++++++++
 2 files changed, 65 insertions(+)

diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index f495a2182c84..8b56b6b62352 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -217,6 +217,57 @@ __attribute_const__ int ib_rate_to_mbps(enum ib_rate rate)
 }
 EXPORT_SYMBOL(ib_rate_to_mbps);
 
+struct ib_speed_attr {
+	const char *str;
+	int speed;
+};
+
+#define IB_SPEED_ATTR(speed_type, _str, _speed) \
+	[speed_type] = {.str = _str, .speed = _speed}
+
+static const struct ib_speed_attr ib_speed_attrs[] = {
+	IB_SPEED_ATTR(IB_SPEED_SDR, " SDR", 25),
+	IB_SPEED_ATTR(IB_SPEED_DDR, " DDR", 50),
+	IB_SPEED_ATTR(IB_SPEED_QDR, " QDR", 100),
+	IB_SPEED_ATTR(IB_SPEED_FDR10, " FDR10", 100),
+	IB_SPEED_ATTR(IB_SPEED_FDR, " FDR", 140),
+	IB_SPEED_ATTR(IB_SPEED_EDR, " EDR", 250),
+	IB_SPEED_ATTR(IB_SPEED_HDR, " HDR", 500),
+	IB_SPEED_ATTR(IB_SPEED_NDR, " NDR", 1000),
+	IB_SPEED_ATTR(IB_SPEED_XDR, " XDR", 2000),
+};
+
+int ib_port_attr_to_speed_info(struct ib_port_attr *attr,
+			       struct ib_port_speed_info *speed_info)
+{
+	int speed_idx = attr->active_speed;
+
+	switch (attr->active_speed) {
+	case IB_SPEED_DDR:
+	case IB_SPEED_QDR:
+	case IB_SPEED_FDR10:
+	case IB_SPEED_FDR:
+	case IB_SPEED_EDR:
+	case IB_SPEED_HDR:
+	case IB_SPEED_NDR:
+	case IB_SPEED_XDR:
+	case IB_SPEED_SDR:
+		break;
+	default:
+		speed_idx = IB_SPEED_SDR; /* Default to SDR for invalid rates */
+		break;
+	}
+
+	speed_info->str = ib_speed_attrs[speed_idx].str;
+	speed_info->rate = ib_speed_attrs[speed_idx].speed;
+	speed_info->rate *= ib_width_enum_to_int(attr->active_width);
+	if (speed_info->rate < 0)
+		return -EINVAL;
+
+	return 0;
+}
+EXPORT_SYMBOL(ib_port_attr_to_speed_info);
+
 __attribute_const__ enum rdma_transport_type
 rdma_node_get_transport(unsigned int node_type)
 {
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 95f1e557cbb8..b984f9581a73 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -878,6 +878,20 @@ __attribute_const__ int ib_rate_to_mult(enum ib_rate rate);
  */
 __attribute_const__ int ib_rate_to_mbps(enum ib_rate rate);
 
+struct ib_port_speed_info {
+	const char *str;
+	int rate;	/* in deci-Gb/sec (100 MBps units) */
+};
+
+/**
+ * ib_port_attr_to_speed_info - Convert port attributes to speed information
+ * @attr: Port attributes containing active_speed and active_width
+ * @speed_info: Speed information to return
+ *
+ * Returns 0 on success, -EINVAL on error.
+ */
+int ib_port_attr_to_speed_info(struct ib_port_attr *attr,
+			       struct ib_port_speed_info *speed_info);
 
 /**
  * enum ib_mr_type - memory region type

-- 
2.47.1