linux-kernel - [PATCH mlx5-next 3/3] net/mlx5: Expose cable

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Message-ID: <1752734895-257735-4-git-send-email-tariqt@nvidia.com>
Date: Thu, 17 Jul 2025 09:48:15 +0300
From: Tariq Toukan <tariqt@...dia.com>
To: Saeed Mahameed <saeed@...nel.org>, Leon Romanovsky <leon@...nel.org>
CC: Eric Dumazet <edumazet@...gle.com>, Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>, Andrew Lunn <andrew+netdev@...n.ch>, "David
 S. Miller" <davem@...emloft.net>, Gal Pressman <gal@...dia.com>, "Saeed
 Mahameed" <saeedm@...dia.com>, Tariq Toukan <tariqt@...dia.com>, Mark Bloch
	<mbloch@...dia.com>, <netdev@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, Oren Sidi <osidi@...dia.com>
Subject: [PATCH mlx5-next 3/3] net/mlx5: Expose cable_length field in PFCC register

From: Oren Sidi <osidi@...dia.com>

Introduce new "cable_length" field in PFCC register and related fields
to enhance rx buffer configuration management:
1. cable_length: Shifts cable length handling to fw by storing a
   manually entered length from user in PFCC.cable_length
2. lane_rate_oper: In a case where PFCC.cable_length is not supported,
   helps compute a default cable length

Signed-off-by: Oren Sidi <osidi@...dia.com>
Reviewed-by: Alex Lazar <alazar@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 include/linux/mlx5/mlx5_ifc.h | 19 +++++++++++++++----
 1 file changed, 15 insertions(+), 4 deletions(-)

diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index e1220aa1e7dc..ed4130e49c27 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -9994,6 +9994,10 @@ struct mlx5_ifc_pude_reg_bits {
 	u8         reserved_at_20[0x60];
 };
 
+enum {
+	MLX5_PTYS_CONNECTOR_TYPE_PORT_DA = 0x7,
+};
+
 struct mlx5_ifc_ptys_reg_bits {
 	u8         reserved_at_0[0x1];
 	u8         an_disable_admin[0x1];
@@ -10030,7 +10034,8 @@ struct mlx5_ifc_ptys_reg_bits {
 	u8         ib_link_width_oper[0x10];
 	u8         ib_proto_oper[0x10];
 
-	u8         reserved_at_160[0x1c];
+	u8         reserved_at_160[0x8];
+	u8         lane_rate_oper[0x14];
 	u8         connector_type[0x4];
 
 	u8         eth_proto_lp_advertise[0x20];
@@ -10485,7 +10490,8 @@ struct mlx5_ifc_pfcc_reg_bits {
 	u8	   buf_ownership[0x2];
 	u8	   reserved_at_6[0x2];
 	u8         local_port[0x8];
-	u8         reserved_at_10[0xb];
+	u8         reserved_at_10[0xa];
+	u8	   cable_length_mask[0x1];
 	u8         ppan_mask_n[0x1];
 	u8         minor_stall_mask[0x1];
 	u8         critical_stall_mask[0x1];
@@ -10514,7 +10520,10 @@ struct mlx5_ifc_pfcc_reg_bits {
 	u8         device_stall_minor_watermark[0x10];
 	u8         device_stall_critical_watermark[0x10];
 
-	u8         reserved_at_a0[0x60];
+	u8	   reserved_at_a0[0x18];
+	u8	   cable_length[0x8];
+
+	u8         reserved_at_c0[0x40];
 };
 
 struct mlx5_ifc_pelc_reg_bits {
@@ -10615,7 +10624,9 @@ struct mlx5_ifc_mtutc_reg_bits {
 struct mlx5_ifc_pcam_enhanced_features_bits {
 	u8         reserved_at_0[0x10];
 	u8         ppcnt_recovery_counters[0x1];
-	u8         reserved_at_11[0xc];
+	u8         reserved_at_11[0x7];
+	u8	   cable_length[0x1];
+	u8	   reserved_at_19[0x4];
 	u8         fec_200G_per_lane_in_pplm[0x1];
 	u8         reserved_at_1e[0x2a];
 	u8         fec_100G_per_lane_in_pplm[0x1];
-- 
2.31.1