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Message-ID: <1cbfc698-102d-dd07-ecae-ff8eb7e655ae@mellanox.com>
Date:   Thu, 22 Aug 2019 19:33:07 +0000
From:   Eran Ben Elisha <eranbe@...lanox.com>
To:     Leon Romanovsky <leon@...nel.org>,
        haiyangz <haiyangz@...rosoft.com>
CC:     "sashal@...nel.org" <sashal@...nel.org>,
        "davem@...emloft.net" <davem@...emloft.net>,
        Saeed Mahameed <saeedm@...lanox.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        kys <kys@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH net-next,v4, 4/6] net/mlx5: Add HV VHCA infrastructure



On 8/22/2019 9:58 PM, Leon Romanovsky wrote:
> On Thu, Aug 22, 2019 at 05:05:51AM +0000, Haiyang Zhang wrote:
>> From: Eran Ben Elisha <eranbe@...lanox.com>
>>
>> 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@...lanox.com>
>> Signed-off-by: Saeed Mahameed <saeedm@...lanox.com>
>> Signed-off-by: Haiyang Zhang <haiyangz@...rosoft.com>
>> ---
>>   drivers/net/ethernet/mellanox/mlx5/core/Makefile   |   2 +-
>>   .../net/ethernet/mellanox/mlx5/core/lib/hv_vhca.c  | 253 +++++++++++++++++++++
>>   .../net/ethernet/mellanox/mlx5/core/lib/hv_vhca.h  | 102 +++++++++
>>   drivers/net/ethernet/mellanox/mlx5/core/main.c     |   7 +
>>   include/linux/mlx5/driver.h                        |   2 +
>>   5 files changed, 365 insertions(+), 1 deletion(-)
>>   create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.c
>>   create mode 100644 drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.h
>>
>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/Makefile b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
>> index fd32a5b..8d443fc 100644
>> --- a/drivers/net/ethernet/mellanox/mlx5/core/Makefile
>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/Makefile
>> @@ -45,7 +45,7 @@ mlx5_core-$(CONFIG_MLX5_ESWITCH)   += eswitch.o eswitch_offloads.o eswitch_offlo
>>   mlx5_core-$(CONFIG_MLX5_MPFS)      += lib/mpfs.o
>>   mlx5_core-$(CONFIG_VXLAN)          += lib/vxlan.o
>>   mlx5_core-$(CONFIG_PTP_1588_CLOCK) += lib/clock.o
>> -mlx5_core-$(CONFIG_PCI_HYPERV_INTERFACE) += lib/hv.o
>> +mlx5_core-$(CONFIG_PCI_HYPERV_INTERFACE) += lib/hv.o lib/hv_vhca.o
>>
>>   #
>>   # Ipoib netdev
>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.c b/drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.c
>> new file mode 100644
>> index 0000000..84d1d75
>> --- /dev/null
>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.c
>> @@ -0,0 +1,253 @@
>> +// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
>> +// Copyright (c) 2018 Mellanox Technologies
>> +
>> +#include <linux/hyperv.h>
>> +#include "mlx5_core.h"
>> +#include "lib/hv.h"
>> +#include "lib/hv_vhca.h"
>> +
>> +struct mlx5_hv_vhca {
>> +	struct mlx5_core_dev       *dev;
>> +	struct workqueue_struct    *work_queue;
>> +	struct mlx5_hv_vhca_agent  *agents[MLX5_HV_VHCA_AGENT_MAX];
>> +	struct mutex                agents_lock; /* Protect agents array */
>> +};
>> +
>> +struct mlx5_hv_vhca_work {
>> +	struct work_struct     invalidate_work;
>> +	struct mlx5_hv_vhca   *hv_vhca;
>> +	u64                    block_mask;
>> +};
>> +
>> +struct mlx5_hv_vhca_data_block {
>> +	u16     sequence;
>> +	u16     offset;
>> +	u8      reserved[4];
>> +	u64     data[15];
>> +};
>> +
>> +struct mlx5_hv_vhca_agent {
>> +	enum mlx5_hv_vhca_agent_type	 type;
>> +	struct mlx5_hv_vhca		*hv_vhca;
>> +	void				*priv;
>> +	u16                              seq;
>> +	void (*control)(struct mlx5_hv_vhca_agent *agent,
>> +			struct mlx5_hv_vhca_control_block *block);
>> +	void (*invalidate)(struct mlx5_hv_vhca_agent *agent,
>> +			   u64 block_mask);
>> +	void (*cleanup)(struct mlx5_hv_vhca_agent *agent);
>> +};
>> +
>> +struct mlx5_hv_vhca *mlx5_hv_vhca_create(struct mlx5_core_dev *dev)
>> +{
>> +	struct mlx5_hv_vhca *hv_vhca = NULL;
>> +
>> +	hv_vhca = kzalloc(sizeof(*hv_vhca), GFP_KERNEL);
>> +	if (!hv_vhca)
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	hv_vhca->work_queue = create_singlethread_workqueue("mlx5_hv_vhca");
> 
> I was under impression that usage of create_* interfaces is discouraged,
> It has WQ_MEMORY_LEGACY flag inside and commit b71ab8c2025ca talks about
> this interface as legacy one.

mlx5 driver has dozens of singlethread workqueues. A general effort to 
remove them can be done later.

> 
>> +	if (!hv_vhca->work_queue) {
>> +		kfree(hv_vhca);
>> +		return ERR_PTR(-ENOMEM);
>> +	}
>> +
>> +	hv_vhca->dev = dev;
>> +	mutex_init(&hv_vhca->agents_lock);
>> +
>> +	return hv_vhca;
>> +}
>> +
>> +void mlx5_hv_vhca_destroy(struct mlx5_hv_vhca *hv_vhca)
>> +{
>> +	if (IS_ERR_OR_NULL(hv_vhca))
>> +		return;
>> +
>> +	destroy_workqueue(hv_vhca->work_queue);
>> +	kfree(hv_vhca);
>> +}
>> +
>> +static void mlx5_hv_vhca_invalidate_work(struct work_struct *work)
>> +{
>> +	struct mlx5_hv_vhca_work *hwork;
>> +	struct mlx5_hv_vhca *hv_vhca;
>> +	int i;
>> +
>> +	hwork = container_of(work, struct mlx5_hv_vhca_work, invalidate_work);
>> +	hv_vhca = hwork->hv_vhca;
>> +
>> +	mutex_lock(&hv_vhca->agents_lock);
>> +	for (i = 0; i < MLX5_HV_VHCA_AGENT_MAX; i++) {
>> +		struct mlx5_hv_vhca_agent *agent = hv_vhca->agents[i];
>> +
>> +		if (!agent || !agent->invalidate)
>> +			continue;
>> +
>> +		if (!(BIT(agent->type) & hwork->block_mask))
>> +			continue;
>> +
>> +		agent->invalidate(agent, hwork->block_mask);
>> +	}
>> +	mutex_unlock(&hv_vhca->agents_lock);
>> +
>> +	kfree(hwork);
>> +}
>> +
>> +void mlx5_hv_vhca_invalidate(void *context, u64 block_mask)
>> +{
>> +	struct mlx5_hv_vhca *hv_vhca = (struct mlx5_hv_vhca *)context;
>> +	struct mlx5_hv_vhca_work *work;
>> +
>> +	work = kzalloc(sizeof(*work), GFP_ATOMIC);
>> +	if (!work)
>> +		return;
>> +
>> +	INIT_WORK(&work->invalidate_work, mlx5_hv_vhca_invalidate_work);
>> +	work->hv_vhca    = hv_vhca;
>> +	work->block_mask = block_mask;
>> +
>> +	queue_work(hv_vhca->work_queue, &work->invalidate_work);
>> +}
>> +
>> +int mlx5_hv_vhca_init(struct mlx5_hv_vhca *hv_vhca)
>> +{
>> +	if (IS_ERR_OR_NULL(hv_vhca))
>> +		return IS_ERR_OR_NULL(hv_vhca);
>> +
>> +	return mlx5_hv_register_invalidate(hv_vhca->dev, hv_vhca,
>> +					   mlx5_hv_vhca_invalidate);
>> +}
>> +
>> +void mlx5_hv_vhca_cleanup(struct mlx5_hv_vhca *hv_vhca)
>> +{
>> +	int i;
>> +
>> +	if (IS_ERR_OR_NULL(hv_vhca))
>> +		return;
>> +
>> +	mutex_lock(&hv_vhca->agents_lock);
>> +	for (i = 0; i < MLX5_HV_VHCA_AGENT_MAX; i++)
>> +		WARN_ON(hv_vhca->agents[i]);
>> +
>> +	mutex_unlock(&hv_vhca->agents_lock);
>> +
>> +	mlx5_hv_unregister_invalidate(hv_vhca->dev);
>> +}
>> +
>> +struct mlx5_hv_vhca_agent *
>> +mlx5_hv_vhca_agent_create(struct mlx5_hv_vhca *hv_vhca,
>> +			  enum mlx5_hv_vhca_agent_type type,
>> +			  void (*control)(struct mlx5_hv_vhca_agent*,
>> +					  struct mlx5_hv_vhca_control_block *block),
>> +			  void (*invalidate)(struct mlx5_hv_vhca_agent*,
>> +					     u64 block_mask),
>> +			  void (*cleaup)(struct mlx5_hv_vhca_agent *agent),
>> +			  void *priv)
>> +{
>> +	struct mlx5_hv_vhca_agent *agent;
>> +
>> +	if (IS_ERR_OR_NULL(hv_vhca))
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	if (type >= MLX5_HV_VHCA_AGENT_MAX)
>> +		return ERR_PTR(-EINVAL);
>> +
>> +	mutex_lock(&hv_vhca->agents_lock);
>> +	if (hv_vhca->agents[type]) {
>> +		mutex_unlock(&hv_vhca->agents_lock);
>> +		return ERR_PTR(-EINVAL);
>> +	}
>> +	mutex_unlock(&hv_vhca->agents_lock);
>> +
>> +	agent = kzalloc(sizeof(*agent), GFP_KERNEL);
>> +	if (!agent)
>> +		return ERR_PTR(-ENOMEM);
>> +
>> +	agent->type      = type;
>> +	agent->hv_vhca   = hv_vhca;
>> +	agent->priv      = priv;
>> +	agent->control   = control;
>> +	agent->invalidate = invalidate;
>> +	agent->cleanup   = cleaup;
>> +
>> +	mutex_lock(&hv_vhca->agents_lock);
>> +	hv_vhca->agents[type] = agent;
>> +	mutex_unlock(&hv_vhca->agents_lock);
>> +
>> +	return agent;
>> +}
>> +
>> +void mlx5_hv_vhca_agent_destroy(struct mlx5_hv_vhca_agent *agent)
>> +{
>> +	struct mlx5_hv_vhca *hv_vhca = agent->hv_vhca;
>> +
>> +	mutex_lock(&hv_vhca->agents_lock);
>> +
>> +	if (WARN_ON(agent != hv_vhca->agents[agent->type])) {
>> +		mutex_unlock(&hv_vhca->agents_lock);
>> +		return;
>> +	}
>> +
>> +	hv_vhca->agents[agent->type] = NULL;
>> +	mutex_unlock(&hv_vhca->agents_lock);
>> +
>> +	if (agent->cleanup)
>> +		agent->cleanup(agent);
>> +
>> +	kfree(agent);
>> +}
>> +
>> +static int mlx5_hv_vhca_data_block_prepare(struct mlx5_hv_vhca_agent *agent,
>> +					   struct mlx5_hv_vhca_data_block *data_block,
>> +					   void *src, int len, int *offset)
>> +{
>> +	int bytes = min_t(int, (int)sizeof(data_block->data), len);
>> +
>> +	data_block->sequence = agent->seq;
>> +	data_block->offset   = (*offset)++;
>> +	memcpy(data_block->data, src, bytes);
>> +
>> +	return bytes;
>> +}
>> +
>> +static void mlx5_hv_vhca_agent_seq_update(struct mlx5_hv_vhca_agent *agent)
>> +{
>> +	agent->seq++;
>> +}
>> +
>> +int mlx5_hv_vhca_agent_write(struct mlx5_hv_vhca_agent *agent,
>> +			     void *buf, int len)
>> +{
>> +	int offset = agent->type * HV_CONFIG_BLOCK_SIZE_MAX;
>> +	int block_offset = 0;
>> +	int total = 0;
>> +	int err;
>> +
>> +	while (len) {
>> +		struct mlx5_hv_vhca_data_block data_block = {0};
>> +		int bytes;
>> +
>> +		bytes = mlx5_hv_vhca_data_block_prepare(agent, &data_block,
>> +							buf + total,
>> +							len, &block_offset);
>> +		if (!bytes)
>> +			return -ENOMEM;
>> +
>> +		err = mlx5_hv_write_config(agent->hv_vhca->dev, &data_block,
>> +					   sizeof(data_block), offset);
>> +		if (err)
>> +			return err;
>> +
>> +		total += bytes;
>> +		len   -= bytes;
>> +	}
>> +
>> +	mlx5_hv_vhca_agent_seq_update(agent);
>> +
>> +	return 0;
>> +}
>> +
>> +void *mlx5_hv_vhca_agent_priv(struct mlx5_hv_vhca_agent *agent)
>> +{
>> +	return agent->priv;
>> +}
>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.h b/drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.h
>> new file mode 100644
>> index 0000000..cdf1303
>> --- /dev/null
>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/lib/hv_vhca.h
>> @@ -0,0 +1,102 @@
>> +/* SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB */
>> +/* Copyright (c) 2019 Mellanox Technologies. */
>> +
>> +#ifndef __LIB_HV_VHCA_H__
>> +#define __LIB_HV_VHCA_H__
>> +
>> +#include "en.h"
>> +#include "lib/hv.h"
>> +
>> +struct mlx5_hv_vhca_agent;
>> +struct mlx5_hv_vhca;
>> +struct mlx5_hv_vhca_control_block;
>> +
>> +enum mlx5_hv_vhca_agent_type {
>> +	MLX5_HV_VHCA_AGENT_MAX = 32,
>> +};
>> +
>> +#if IS_ENABLED(CONFIG_PCI_HYPERV_INTERFACE)
>> +
>> +struct mlx5_hv_vhca_control_block {
>> +	u32     capabilities;
>> +	u32     control;
>> +	u16     command;
>> +	u16     command_ack;
>> +	u16     version;
>> +	u16     rings;
>> +	u32     reserved1[28];
>> +};
>> +
>> +struct mlx5_hv_vhca *mlx5_hv_vhca_create(struct mlx5_core_dev *dev);
>> +void mlx5_hv_vhca_destroy(struct mlx5_hv_vhca *hv_vhca);
>> +int mlx5_hv_vhca_init(struct mlx5_hv_vhca *hv_vhca);
>> +void mlx5_hv_vhca_cleanup(struct mlx5_hv_vhca *hv_vhca);
>> +void mlx5_hv_vhca_invalidate(void *context, u64 block_mask);
>> +
>> +struct mlx5_hv_vhca_agent *
>> +mlx5_hv_vhca_agent_create(struct mlx5_hv_vhca *hv_vhca,
>> +			  enum mlx5_hv_vhca_agent_type type,
>> +			  void (*control)(struct mlx5_hv_vhca_agent*,
>> +					  struct mlx5_hv_vhca_control_block *block),
>> +			  void (*invalidate)(struct mlx5_hv_vhca_agent*,
>> +					     u64 block_mask),
>> +			  void (*cleanup)(struct mlx5_hv_vhca_agent *agent),
>> +			  void *context);
>> +
>> +void mlx5_hv_vhca_agent_destroy(struct mlx5_hv_vhca_agent *agent);
>> +int mlx5_hv_vhca_agent_write(struct mlx5_hv_vhca_agent *agent,
>> +			     void *buf, int len);
>> +void *mlx5_hv_vhca_agent_priv(struct mlx5_hv_vhca_agent *agent);
>> +
>> +#else
>> +
>> +static inline struct mlx5_hv_vhca *
>> +mlx5_hv_vhca_create(struct mlx5_core_dev *dev)
>> +{
>> +	return NULL;
>> +}
>> +
>> +static inline void mlx5_hv_vhca_destroy(struct mlx5_hv_vhca *hv_vhca)
>> +{
>> +}
>> +
>> +static inline int mlx5_hv_vhca_init(struct mlx5_hv_vhca *hv_vhca)
>> +{
>> +	return 0;
>> +}
>> +
>> +static inline void mlx5_hv_vhca_cleanup(struct mlx5_hv_vhca *hv_vhca)
>> +{
>> +}
>> +
>> +static inline void mlx5_hv_vhca_invalidate(void *context,
>> +					   u64 block_mask)
>> +{
>> +}
>> +
>> +static inline struct mlx5_hv_vhca_agent *
>> +mlx5_hv_vhca_agent_create(struct mlx5_hv_vhca *hv_vhca,
>> +			  enum mlx5_hv_vhca_agent_type type,
>> +			  void (*control)(struct mlx5_hv_vhca_agent*,
>> +					  struct mlx5_hv_vhca_control_block *block),
>> +			  void (*invalidate)(struct mlx5_hv_vhca_agent*,
>> +					     u64 block_mask),
>> +			  void (*cleanup)(struct mlx5_hv_vhca_agent *agent),
>> +			  void *context)
>> +{
>> +	return NULL;
>> +}
>> +
>> +static inline void mlx5_hv_vhca_agent_destroy(struct mlx5_hv_vhca_agent *agent)
>> +{
>> +}
>> +
>> +static inline int
>> +mlx5_hv_vhca_write_agent(struct mlx5_hv_vhca_agent *agent,
>> +			 void *buf, int len)
>> +{
>> +	return 0;
>> +}
>> +#endif
>> +
>> +#endif /* __LIB_HV_VHCA_H__ */
>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/main.c b/drivers/net/ethernet/mellanox/mlx5/core/main.c
>> index 0b70b1d..61388ca 100644
>> --- a/drivers/net/ethernet/mellanox/mlx5/core/main.c
>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/main.c
>> @@ -69,6 +69,7 @@
>>   #include "lib/pci_vsc.h"
>>   #include "diag/fw_tracer.h"
>>   #include "ecpf.h"
>> +#include "lib/hv_vhca.h"
>>
>>   MODULE_AUTHOR("Eli Cohen <eli@...lanox.com>");
>>   MODULE_DESCRIPTION("Mellanox 5th generation network adapters (ConnectX series) core driver");
>> @@ -870,6 +871,7 @@ static int mlx5_init_once(struct mlx5_core_dev *dev)
>>   	}
>>
>>   	dev->tracer = mlx5_fw_tracer_create(dev);
>> +	dev->hv_vhca = mlx5_hv_vhca_create(dev);
>>
>>   	return 0;
>>
>> @@ -900,6 +902,7 @@ static int mlx5_init_once(struct mlx5_core_dev *dev)
>>
>>   static void mlx5_cleanup_once(struct mlx5_core_dev *dev)
>>   {
>> +	mlx5_hv_vhca_destroy(dev->hv_vhca);
>>   	mlx5_fw_tracer_destroy(dev->tracer);
>>   	mlx5_fpga_cleanup(dev);
>>   	mlx5_eswitch_cleanup(dev->priv.eswitch);
>> @@ -1067,6 +1070,8 @@ static int mlx5_load(struct mlx5_core_dev *dev)
>>   		goto err_fw_tracer;
>>   	}
>>
>> +	mlx5_hv_vhca_init(dev->hv_vhca);
> 
> What is the point to declare this function as "int ..." if you are not
> interested in result?
> 
>> +
>>   	err = mlx5_fpga_device_start(dev);
>>   	if (err) {
>>   		mlx5_core_err(dev, "fpga device start failed %d\n", err);
>> @@ -1122,6 +1127,7 @@ static int mlx5_load(struct mlx5_core_dev *dev)
>>   err_ipsec_start:
>>   	mlx5_fpga_device_stop(dev);
>>   err_fpga_start:
>> +	mlx5_hv_vhca_cleanup(dev->hv_vhca);
>>   	mlx5_fw_tracer_cleanup(dev->tracer);
>>   err_fw_tracer:
>>   	mlx5_eq_table_destroy(dev);
>> @@ -1142,6 +1148,7 @@ static void mlx5_unload(struct mlx5_core_dev *dev)
>>   	mlx5_accel_ipsec_cleanup(dev);
>>   	mlx5_accel_tls_cleanup(dev);
>>   	mlx5_fpga_device_stop(dev);
>> +	mlx5_hv_vhca_cleanup(dev->hv_vhca);
>>   	mlx5_fw_tracer_cleanup(dev->tracer);
>>   	mlx5_eq_table_destroy(dev);
>>   	mlx5_irq_table_destroy(dev);
>> diff --git a/include/linux/mlx5/driver.h b/include/linux/mlx5/driver.h
>> index df23f17..13b4cf2 100644
>> --- a/include/linux/mlx5/driver.h
>> +++ b/include/linux/mlx5/driver.h
>> @@ -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 {
>> --
>> 1.8.3.1
>>

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