netdev - [net-next 07/15] net/mlx5: Enable setting hairpin queue size

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Date:   Fri, 19 Jan 2018 23:34:49 +0200
From:   Saeed Mahameed <saeedm@...lanox.com>
To:     "David S. Miller" <davem@...emloft.net>
Cc:     netdev@...r.kernel.org, Or Gerlitz <ogerlitz@...lanox.com>,
        Saeed Mahameed <saeedm@...lanox.com>
Subject: [net-next 07/15] net/mlx5: Enable setting hairpin queue size

From: Or Gerlitz <ogerlitz@...lanox.com>

Allow to specify the size of the hairpin queues along with the
packet buffer data size from the core setup code.

If the driver doesn't provide this, the FW applies proper value that
matches the provided data size and a FW chosen RQ stride size.

Signed-off-by: Or Gerlitz <ogerlitz@...lanox.com>
Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
---
 drivers/net/ethernet/mellanox/mlx5/core/transobj.c | 2 ++
 include/linux/mlx5/mlx5_ifc.h                      | 8 ++++++--
 include/linux/mlx5/transobj.h                      | 1 +
 3 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/transobj.c b/drivers/net/ethernet/mellanox/mlx5/core/transobj.c
index 6f90d1fce5c5..9e38343a951f 100644
--- a/drivers/net/ethernet/mellanox/mlx5/core/transobj.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/transobj.c
@@ -413,6 +413,7 @@ static int mlx5_hairpin_create_rq(struct mlx5_core_dev *mdev,
 	MLX5_SET(rqc, rqc, counter_set_id, params->q_counter);
 
 	MLX5_SET(wq, wq, log_hairpin_data_sz, params->log_data_size);
+	MLX5_SET(wq, wq, log_hairpin_num_packets, params->log_num_packets);
 
 	return mlx5_core_create_rq(mdev, in, MLX5_ST_SZ_BYTES(create_rq_in), rqn);
 }
@@ -430,6 +431,7 @@ static int mlx5_hairpin_create_sq(struct mlx5_core_dev *mdev,
 	MLX5_SET(sqc, sqc, state, MLX5_SQC_STATE_RST);
 
 	MLX5_SET(wq, wq, log_hairpin_data_sz, params->log_data_size);
+	MLX5_SET(wq, wq, log_hairpin_num_packets, params->log_num_packets);
 
 	return mlx5_core_create_sq(mdev, in, MLX5_ST_SZ_BYTES(create_sq_in), sqn);
 }
diff --git a/include/linux/mlx5/mlx5_ifc.h b/include/linux/mlx5/mlx5_ifc.h
index acd829d8613b..199bfcd2f2ce 100644
--- a/include/linux/mlx5/mlx5_ifc.h
+++ b/include/linux/mlx5/mlx5_ifc.h
@@ -1031,7 +1031,9 @@ struct mlx5_ifc_cmd_hca_cap_bits {
 	u8         log_max_hairpin_queues[0x5];
 	u8         reserved_at_3c8[0x3];
 	u8         log_max_hairpin_wq_data_sz[0x5];
-	u8         reserved_at_3d0[0xb];
+	u8         reserved_at_3d0[0x3];
+	u8         log_max_hairpin_num_packets[0x5];
+	u8         reserved_at_3d8[0x3];
 	u8         log_max_wq_sz[0x5];
 
 	u8         nic_vport_change_event[0x1];
@@ -1172,7 +1174,9 @@ struct mlx5_ifc_wq_bits {
 	u8         reserved_at_118[0x3];
 	u8         log_wq_sz[0x5];
 
-	u8         reserved_at_120[0xb];
+	u8         reserved_at_120[0x3];
+	u8         log_hairpin_num_packets[0x5];
+	u8         reserved_at_128[0x3];
 	u8         log_hairpin_data_sz[0x5];
 	u8         reserved_at_130[0x5];
 
diff --git a/include/linux/mlx5/transobj.h b/include/linux/mlx5/transobj.h
index 1bcd8d5562f0..7e8f281f8c00 100644
--- a/include/linux/mlx5/transobj.h
+++ b/include/linux/mlx5/transobj.h
@@ -77,6 +77,7 @@ void mlx5_core_destroy_rqt(struct mlx5_core_dev *dev, u32 rqtn);
 
 struct mlx5_hairpin_params {
 	u8  log_data_size;
+	u8  log_num_packets;
 	u16 q_counter;
 	int num_channels;
 };
-- 
2.13.0