linux-kernel - [PATCH rdma-next 1/2] RDMA/core: Add new IB rate for XDR (8x) support

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Message-ID: <20251120-speed-8-v1-1-e6a7efef8cb8@nvidia.com>
Date: Thu, 20 Nov 2025 17:15:15 +0200
From: Leon Romanovsky <leon@...nel.org>
To: Jason Gunthorpe <jgg@...pe.ca>,
	Leon Romanovsky <leon@...nel.org>
Cc: linux-rdma@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Maher Sanalla <msanalla@...dia.com>,
	Michael Guralnik <michaelgur@...dia.com>
Subject: [PATCH rdma-next 1/2] RDMA/core: Add new IB rate for XDR (8x) support

From: Maher Sanalla <msanalla@...dia.com>

Add the new rates as defined in the Infiniband spec for XDR and 8x
link width support.

Furthermore, modify the utility conversion methods accordingly.

Reference: IB Spec Release 1.8

Reviewed-by: Michael Guralnik <michaelgur@...dia.com>
Signed-off-by: Maher Sanalla <msanalla@...dia.com>
Signed-off-by: Leon Romanovsky <leonro@...dia.com>
---
 drivers/infiniband/core/verbs.c | 3 +++
 include/rdma/ib_verbs.h         | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index 3a5f81402d2f..11b1a194de44 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -148,6 +148,7 @@ __attribute_const__ int ib_rate_to_mult(enum ib_rate rate)
 	case IB_RATE_400_GBPS: return 160;
 	case IB_RATE_600_GBPS: return 240;
 	case IB_RATE_800_GBPS: return 320;
+	case IB_RATE_1600_GBPS: return 640;
 	default:	       return  -1;
 	}
 }
@@ -178,6 +179,7 @@ __attribute_const__ enum ib_rate mult_to_ib_rate(int mult)
 	case 160: return IB_RATE_400_GBPS;
 	case 240: return IB_RATE_600_GBPS;
 	case 320: return IB_RATE_800_GBPS;
+	case 640: return IB_RATE_1600_GBPS;
 	default:  return IB_RATE_PORT_CURRENT;
 	}
 }
@@ -208,6 +210,7 @@ __attribute_const__ int ib_rate_to_mbps(enum ib_rate rate)
 	case IB_RATE_400_GBPS: return 425000;
 	case IB_RATE_600_GBPS: return 637500;
 	case IB_RATE_800_GBPS: return 850000;
+	case IB_RATE_1600_GBPS: return 1700000;
 	default:	       return -1;
 	}
 }
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h
index 0a85af610b6b..6aad66bc5dd7 100644
--- a/include/rdma/ib_verbs.h
+++ b/include/rdma/ib_verbs.h
@@ -859,6 +859,7 @@ enum ib_rate {
 	IB_RATE_400_GBPS = 21,
 	IB_RATE_600_GBPS = 22,
 	IB_RATE_800_GBPS = 23,
+	IB_RATE_1600_GBPS = 25,
 };
 
 /**

-- 
2.51.1