Merge branch 'txq_max_rate'

Or Gerlitz says:

====================
Add max rate TXQ attribute

Add the ability to set a max-rate limitation for TX queues.
The attribute name is maxrate and the units are Mbs, to make
it similar to the existing max-rate limitation knobs (ETS and
SRIOV ndo calls).

changes from V2:
  - added Documentation (thanks Florian and Tom)
  - rebased to latest net-next to comply with the swdev ndo removal
  - addressed more feedback from Dave on the comments style

changes from V1:
  - addressed feedback from Dave

changes from V0:
  - addressed feedback from Sergei

John Fastabend (1):
  net: Add max rate tx queue attribute
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

3 files changed, 35 insertions, 4 deletions

diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 1cc54822b931..4550c67b92e4 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -205,6 +205,7 @@ enum {
 	MLX4_DEV_CAP_FLAG2_RECOVERABLE_ERROR_EVENT = 1LL << 20,
 	MLX4_DEV_CAP_FLAG2_PORT_REMAP		= 1LL <<  21,
 	MLX4_DEV_CAP_FLAG2_QCN			= 1LL <<  22,
+	MLX4_DEV_CAP_FLAG2_QP_RATE_LIMIT	= 1LL <<  23
 };
 
 enum {
@@ -450,6 +451,21 @@ enum mlx4_module_id {
 	MLX4_MODULE_ID_QSFP28           = 0x11,
 };
 
+enum { /* rl */
+	MLX4_QP_RATE_LIMIT_NONE		= 0,
+	MLX4_QP_RATE_LIMIT_KBS		= 1,
+	MLX4_QP_RATE_LIMIT_MBS		= 2,
+	MLX4_QP_RATE_LIMIT_GBS		= 3
+};
+
+struct mlx4_rate_limit_caps {
+	u16	num_rates; /* Number of different rates */
+	u8	min_unit;
+	u16	min_val;
+	u8	max_unit;
+	u16	max_val;
+};
+
 static inline u64 mlx4_fw_ver(u64 major, u64 minor, u64 subminor)
 {
 	return (major << 32) | (minor << 16) | subminor;
@@ -565,6 +581,7 @@ struct mlx4_caps {
 	u32			dmfs_high_rate_qpn_base;
 	u32			dmfs_high_rate_qpn_range;
 	u32			vf_caps;
+	struct mlx4_rate_limit_caps rl_caps;
 };
 
 struct mlx4_buf_list {
diff --git a/include/linux/mlx4/qp.h b/include/linux/mlx4/qp.h
index 551f85456c11..1023ebe035b7 100644
--- a/include/linux/mlx4/qp.h
+++ b/include/linux/mlx4/qp.h
@@ -207,14 +207,16 @@ struct mlx4_qp_context {
 	__be32			msn;
 	__be16			rq_wqe_counter;
 	__be16			sq_wqe_counter;
-	u32			reserved3[2];
+	u32			reserved3;
+	__be16			rate_limit_params;
+	__be16			reserved4;
 	__be32			param3;
 	__be32			nummmcpeers_basemkey;
 	u8			log_page_size;
-	u8			reserved4[2];
+	u8			reserved5[2];
 	u8			mtt_base_addr_h;
 	__be32			mtt_base_addr_l;
-	u32			reserved5[10];
+	u32			reserved6[10];
 };
 
 struct mlx4_update_qp_context {
@@ -229,6 +231,7 @@ struct mlx4_update_qp_context {
 enum {
 	MLX4_UPD_QP_MASK_PM_STATE	= 32,
 	MLX4_UPD_QP_MASK_VSD		= 33,
+	MLX4_UPD_QP_MASK_RATE_LIMIT	= 35,
 };
 
 enum {
@@ -428,7 +431,8 @@ struct mlx4_wqe_inline_seg {
 enum mlx4_update_qp_attr {
 	MLX4_UPDATE_QP_SMAC		= 1 << 0,
 	MLX4_UPDATE_QP_VSD		= 1 << 1,
-	MLX4_UPDATE_QP_SUPPORTED_ATTRS	= (1 << 2) - 1
+	MLX4_UPDATE_QP_RATE_LIMIT	= 1 << 2,
+	MLX4_UPDATE_QP_SUPPORTED_ATTRS	= (1 << 3) - 1
 };
 
 enum mlx4_update_qp_params_flags {
@@ -438,6 +442,8 @@ enum mlx4_update_qp_params_flags {
 struct mlx4_update_qp_params {
 	u8	smac_index;
 	u32	flags;
+	u16	rate_unit;
+	u16	rate_val;
 };
 
 int mlx4_update_qp(struct mlx4_dev *dev, u32 qpn,
diff --git a/include/linux/netdevice.h b/include/linux/netdevice.h
index dd1d069758be..76c5de4978a8 100644
--- a/include/linux/netdevice.h
+++ b/include/linux/netdevice.h
@@ -587,6 +587,7 @@ struct netdev_queue {
 #ifdef CONFIG_BQL
 	struct dql		dql;
 #endif
+	unsigned long		tx_maxrate;
 } ____cacheline_aligned_in_smp;
 
 static inline int netdev_queue_numa_node_read(const struct netdev_queue *q)
@@ -1022,6 +1023,10 @@ typedef u16 (*select_queue_fallback_t)(struct net_device *dev,
  *	be otherwise expressed by feature flags. The check is called with
  *	the set of features that the stack has calculated and it returns
  *	those the driver believes to be appropriate.
+ * int (*ndo_set_tx_maxrate)(struct net_device *dev,
+ *			     int queue_index, u32 maxrate);
+ *	Called when a user wants to set a max-rate limitation of specific
+ *	TX queue.
  */
 struct net_device_ops {
 	int			(*ndo_init)(struct net_device *dev);
@@ -1178,6 +1183,9 @@ struct net_device_ops {
 	netdev_features_t	(*ndo_features_check) (struct sk_buff *skb,
 						       struct net_device *dev,
 						       netdev_features_t features);
+	int			(*ndo_set_tx_maxrate)(struct net_device *dev,
+						      int queue_index,
+						      u32 maxrate);
 };
 
 /**