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net/mlx5: Add HV VHCA infrastructure

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HV VHCA is a layer which provides PF to VF communication channel based on
HyperV PCI config channel. It implements Mellanox's Inter VHCA control
communication protocol. The protocol contains control block in order to
pass messages between the PF and VF drivers, and data blocks in order to
pass actual data.

The infrastructure is agent based. Each agent will be responsible of
contiguous buffer blocks in the VHCA config space. This infrastructure will
bind agents to their blocks, and those agents can only access read/write
the buffer blocks assigned to them. Each agent will provide three
callbacks (control, invalidate, cleanup). Control will be invoked when
block-0 is invalidated with a command that concerns this agent. Invalidate
callback will be invoked if one of the blocks assigned to this agent was
invalidated. Cleanup will be invoked before the agent is being freed in
order to clean all of its open resources or deferred works.

Block-0 serves as the control block. All execution commands from the PF
will be written by the PF over this block. VF will ack on those by
writing on block-0 as well. Its format is described by struct
mlx5_hv_vhca_control_block layout.

Signed-off-by: Eran Ben Elisha <eranbe@mellanox.com>
Signed-off-by: Saeed Mahameed <saeedm@mellanox.com>
Signed-off-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Eran Ben Elisha
2019-08-22 05:05:51 +00:00
committed by David S. Miller
parent 913d14e866
commit 87175120de
5 changed files with 365 additions and 1 deletions
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2
include/linux/mlx5/driver.h
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@@ -659,6 +659,7 @@ struct mlx5_clock {
struct mlx5_fw_tracer;
struct mlx5_vxlan;
struct mlx5_geneve;
struct mlx5_hv_vhca;
struct mlx5_core_dev {
struct device *device;
@@ -706,6 +707,7 @@ struct mlx5_core_dev {
struct mlx5_ib_clock_info *clock_info;
struct mlx5_fw_tracer *tracer;
u32 vsc_addr;
struct mlx5_hv_vhca *hv_vhca;
};
struct mlx5_db {