net/mlx4: Add support for A0 steering

Add the required firmware commands for A0 steering and a way to enable
that. The firmware support focuses on INIT_HCA, QUERY_HCA, QUERY_PORT,
QUERY_DEV_CAP and QUERY_FUNC_CAP commands. Those commands are used
to configure and query the device.

The different A0 DMFS (steering) modes are:

Static - optimized performance, but flow steering rules are
limited. This mode should be choosed explicitly by the user
in order to be used.

Dynamic - this mode should be explicitly choosed by the user.
In this mode, the FW works in optimized steering mode as long as
it can and afterwards automatically drops to classic (full) DMFS.

Disable - this mode should be explicitly choosed by the user.
The user instructs the system not to use optimized steering, even if
the FW supports Dynamic A0 DMFS (and thus will be able to use optimized
steering in Default A0 DMFS mode).

Default - this mode is implicitly choosed. In this mode, if the FW
supports Dynamic A0 DMFS, it'll work in this mode. Otherwise, it'll
work at Disable A0 DMFS mode.

Under SRIOV configuration, when the A0 steering mode is enabled,
older guest VF drivers who aren't using the RX QP allocation flag
(MLX4_RESERVE_A0_QP) will get a QP from the general range and
fail when attempting to register a steering rule. To avoid that,
the PF context behaviour is changed once on A0 static mode, to
require support for the allocation flag in VF drivers too.

In order to enable A0 steering, we use log_num_mgm_entry_size param.
If the value of the parameter is not positive, we treat the absolute
value of log_num_mgm_entry_size as a bit field. Setting bit 2 of this
bit field enables static A0 steering.

Signed-off-by: Matan Barak <matanb@mellanox.com>
Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 15 insertions, 2 deletions

diff --git a/include/linux/mlx4/device.h b/include/linux/mlx4/device.h
index 39890cddc5fa..25c791e295fd 100644
--- a/include/linux/mlx4/device.h
+++ b/include/linux/mlx4/device.h
@@ -117,6 +117,14 @@ enum {
         MLX4_STEERING_MODE_DEVICE_MANAGED
 };
 
+enum {
+        MLX4_STEERING_DMFS_A0_DEFAULT,
+        MLX4_STEERING_DMFS_A0_DYNAMIC,
+        MLX4_STEERING_DMFS_A0_STATIC,
+        MLX4_STEERING_DMFS_A0_DISABLE,
+        MLX4_STEERING_DMFS_A0_NOT_SUPPORTED
+};
+
 static inline const char *mlx4_steering_mode_str(int steering_mode)
 {
         switch (steering_mode) {
@@ -191,7 +199,8 @@ enum {
         MLX4_DEV_CAP_FLAG2_ETH_BACKPL_AN_REP    = 1LL <<  15,
         MLX4_DEV_CAP_FLAG2_CONFIG_DEV           = 1LL <<  16,
         MLX4_DEV_CAP_FLAG2_SYS_EQS              = 1LL <<  17,
-        MLX4_DEV_CAP_FLAG2_80_VFS               = 1LL <<  18
+        MLX4_DEV_CAP_FLAG2_80_VFS               = 1LL <<  18,
+        MLX4_DEV_CAP_FLAG2_FS_A0                = 1LL <<  19
 };
 
 enum {
@@ -225,7 +234,8 @@ enum {
 
 enum {
         MLX4_FUNC_CAP_64B_EQE_CQE       = 1L << 0,
-        MLX4_FUNC_CAP_EQE_CQE_STRIDE    = 1L << 1
+        MLX4_FUNC_CAP_EQE_CQE_STRIDE    = 1L << 1,
+        MLX4_FUNC_CAP_DMFS_A0_STATIC    = 1L << 2
 };
 
 
@@ -482,6 +492,7 @@ struct mlx4_caps {
         int                     reserved_mcgs;
         int                     num_qp_per_mgm;
         int                     steering_mode;
+        int                     dmfs_high_steer_mode;
         int                     fs_log_max_ucast_qp_range_size;
         int                     num_pds;
         int                     reserved_pds;
@@ -522,6 +533,8 @@ struct mlx4_caps {
         int                     tunnel_offload_mode;
         u8                      rx_checksum_flags_port[MLX4_MAX_PORTS + 1];
         u8                      alloc_res_qp_mask;
+        u32                     dmfs_high_rate_qpn_base;
+        u32                     dmfs_high_rate_qpn_range;
 };
 
 struct mlx4_buf_list {