RE: [PATCH v7 1/5] raw/ifpga: introduce AFU driver framework

["Zhang, Tianfei" <tianfei.zhang@intel.com>]

> -----Original Message-----
> From: Huang, Wei <wei.huang@intel.com>
> Sent: Thursday, June 9, 2022 3:37 PM
> To: dev@dpdk.org; thomas@monjalon.net; nipun.gupta@nxp.com;
> hemant.agrawal@nxp.com
> Cc: stable@dpdk.org; Xu, Rosen <rosen.xu@intel.com>; Zhang, Tianfei
> <tianfei.zhang@intel.com>; Zhang, Qi Z <qi.z.zhang@intel.com>; Huang, Wei
> <wei.huang@intel.com>
> Subject: [PATCH v7 1/5] raw/ifpga: introduce AFU driver framework
> 
> AFU (Acceleration Function Unit) is part of FPGA and enumerated by ifpga driver.
> This driver implements common AFU device interfaces and exposes them to
> application as standard raw device APIs.
> Normally application can operate specified AFU as below, 1. call
> rte_rawdev_pmd_get_named_dev() to find AFU device.
> 2. call rte_rawdev_configure() to initialize AFU device.
> 3. call rte_rawdev_selftest() to test AFU device.
> 
> Signed-off-by: Wei Huang <wei.huang@intel.com>
> ---
> v2: fix typo
> ---
> v3: fix build error in FreeBSD13-64, UB2004-32 and UB2204-32
> ---
> v4: fix coding style issue and build error in FreeBSD13-64
> ---
> v5: split patch into several patches
> ---
> v6: move source files to ifpga and rename, use spinlock
> ---
>  drivers/raw/ifpga/afu_pmd_core.c | 453
> +++++++++++++++++++++++++++++++++++++++
>  drivers/raw/ifpga/afu_pmd_core.h |  76 +++++++
>  drivers/raw/ifpga/meson.build    |   2 +-
>  3 files changed, 530 insertions(+), 1 deletion(-)  create mode 100644
> drivers/raw/ifpga/afu_pmd_core.c  create mode 100644
> drivers/raw/ifpga/afu_pmd_core.h
> 
> diff --git a/drivers/raw/ifpga/afu_pmd_core.c
> b/drivers/raw/ifpga/afu_pmd_core.c
> new file mode 100644
> index 0000000..a24b517
> --- /dev/null
> +++ b/drivers/raw/ifpga/afu_pmd_core.c
> @@ -0,0 +1,453 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright 2022 Intel Corporation
> + *
> + * AFU is Acceleration Function Unit in FPGA, it is enumerated by ifpga pmd.
> + * Suppose AFU is found in FPGA at PCI address 31:00.0, then you can
> +create
> + * and test a AFU device by following steps in application.
> + * 1. rte_vdev_init("ifpga_rawdev_cfg0", "ifpga=31:00.0,port=0")
> + * 2. rawdev = rte_rawdev_pmd_get_named_dev("afu_0|31:00.0")
> + * 3. rte_rawdev_configure(rawdev->dev_id, &cfg, sizeof(cfg))
> + * 4. rte_rawdev_selftest(rawdev->dev_id)
> + * 5. rte_vdev_uninit("ifpga_rawdev_cfg0")
> + *
> + * AFU device name format used in rte_rawdev_pmd_get_named_dev is
> + * "afu_[port]|[BDF]". Please refer to OPAE documentation for the
> +meaning of
> + * port. Each AFU device has specific configuration data, they are
> +defined
> + * in rte_pmd_afu.h.
> + *
> + */
> +
> +#include <errno.h>
> +#include <stdio.h>
> +#include <stdint.h>
> +#include <stdlib.h>
> +#include <string.h>
> +#include <unistd.h>
> +#include <fcntl.h>
> +#include <poll.h>
> +#include <sys/eventfd.h>
> +
> +#include <rte_eal.h>
> +#include <rte_malloc.h>
> +#include <rte_memzone.h>
> +#include <rte_rawdev_pmd.h>
> +
> +#include "afu_pmd_core.h"
> +
> +static struct rte_afu_uuid afu_pmd_uuid_map[AFU_RAWDEV_MAX_DRVS+1];
> +TAILQ_HEAD(afu_drv_list, afu_rawdev_drv); static struct afu_drv_list
> +afu_pmd_list = TAILQ_HEAD_INITIALIZER(afu_pmd_list);
> +
> +static inline int afu_rawdev_trylock(struct afu_rawdev *dev) {
> +	if (!dev || !dev->sd)
> +		return 0;
> +
> +	return rte_spinlock_trylock(&dev->sd->lock);
> +}
> +
> +static inline void afu_rawdev_unlock(struct afu_rawdev *dev) {
> +	if (!dev || !dev->sd)
> +		return;
> +
> +	rte_spinlock_unlock(&dev->sd->lock);
> +}
> +
> +static int afu_rawdev_configure(const struct rte_rawdev *rawdev,
> +	rte_rawdev_obj_t config, size_t config_size) {
> +	struct afu_rawdev *dev = NULL;
> +	int ret = 0;
> +
> +	IFPGA_RAWDEV_PMD_FUNC_TRACE();
> +
> +	dev = afu_rawdev_get_priv(rawdev);
> +	if (!dev)
> +		return -ENODEV;
> +
> +	if (dev->ops && dev->ops->config)
> +		ret = (*dev->ops->config)(dev, config, config_size);
> +
> +	return ret;
> +}
> +
> +static int afu_rawdev_start(struct rte_rawdev *rawdev) {
> +	struct afu_rawdev *dev = NULL;
> +	int ret = 0;
> +
> +	IFPGA_RAWDEV_PMD_FUNC_TRACE();
> +
> +	dev = afu_rawdev_get_priv(rawdev);
> +	if (!dev)
> +		return -ENODEV;
> +
> +	ret = afu_rawdev_trylock(dev);
> +	if (!ret) {
> +		IFPGA_RAWDEV_PMD_WARN("AFU is busy, please start it
> later");
> +		return ret;
> +	}
> +
> +	if (dev->ops && dev->ops->start)
> +		ret = (*dev->ops->start)(dev);
> +
> +	afu_rawdev_unlock(dev);
> +
> +	return ret;
> +}
> +
> +static void afu_rawdev_stop(struct rte_rawdev *rawdev) {
> +	struct afu_rawdev *dev = NULL;
> +	int ret = 0;
> +
> +	IFPGA_RAWDEV_PMD_FUNC_TRACE();
> +
> +	dev = afu_rawdev_get_priv(rawdev);
> +	if (!dev)
> +		return;
> +
> +	ret = afu_rawdev_trylock(dev);
> +	if (!ret) {
> +		IFPGA_RAWDEV_PMD_WARN("AFU is busy, please stop it
> later");
> +		return;
> +	}
> +
> +	if (dev->ops && dev->ops->stop)
> +		ret = (*dev->ops->stop)(dev);
> +
> +	afu_rawdev_unlock(dev);
> +}
> +
> +static int afu_rawdev_close(struct rte_rawdev *rawdev) {
> +	struct afu_rawdev *dev = NULL;
> +	int ret = 0;
> +
> +	IFPGA_RAWDEV_PMD_FUNC_TRACE();
> +
> +	dev = afu_rawdev_get_priv(rawdev);
> +	if (!dev)
> +		return -ENODEV;
> +
> +	if (dev->ops && dev->ops->close)
> +		ret = (*dev->ops->close)(dev);
> +
> +	return ret;
> +}
> +
> +static int afu_rawdev_reset(struct rte_rawdev *rawdev) {
> +	struct afu_rawdev *dev = NULL;
> +	int ret = 0;
> +
> +	IFPGA_RAWDEV_PMD_FUNC_TRACE();
> +
> +	dev = afu_rawdev_get_priv(rawdev);
> +	if (!dev)
> +		return -ENODEV;
> +
> +	ret = afu_rawdev_trylock(dev);
> +	if (!ret) {
> +		IFPGA_RAWDEV_PMD_WARN("AFU is busy, please reset it
> later");
> +		return ret;
> +	}
> +
> +	if (dev->ops && dev->ops->reset)
> +		ret = (*dev->ops->reset)(dev);
> +
> +	afu_rawdev_unlock(dev);
> +
> +	return ret;
> +}
> +
> +static int afu_rawdev_selftest(uint16_t dev_id) {
> +	struct afu_rawdev *dev = NULL;
> +	int ret = 0;
> +
> +	IFPGA_RAWDEV_PMD_FUNC_TRACE();
> +
> +	if (!rte_rawdev_pmd_is_valid_dev(dev_id))
> +		return -ENODEV;
> +
> +	dev = afu_rawdev_get_priv(&rte_rawdevs[dev_id]);
> +	if (!dev)
> +		return -ENOENT;
> +
> +	ret = afu_rawdev_trylock(dev);
> +	if (!ret) {
> +		IFPGA_RAWDEV_PMD_WARN("AFU is busy, please test it
> later");
> +		return ret;
> +	}
> +
> +	if (dev->ops && dev->ops->test)
> +		ret = (*dev->ops->test)(dev);
> +
> +	afu_rawdev_unlock(dev);
> +
> +	return ret;
> +}
> +
> +static int afu_rawdev_dump(struct rte_rawdev *rawdev, FILE *f) {
> +	struct afu_rawdev *dev = NULL;
> +	int ret = 0;
> +
> +	IFPGA_RAWDEV_PMD_FUNC_TRACE();
> +
> +	dev = afu_rawdev_get_priv(rawdev);
> +	if (!dev)
> +		return -ENODEV;
> +
> +	if (dev->ops && dev->ops->dump)
> +		ret = (*dev->ops->dump)(dev, f);
> +
> +	return ret;
> +}
> +
> +static const struct rte_rawdev_ops afu_rawdev_ops = {
> +	.dev_info_get = NULL,
> +	.dev_configure = afu_rawdev_configure,
> +	.dev_start = afu_rawdev_start,
> +	.dev_stop = afu_rawdev_stop,
> +	.dev_close = afu_rawdev_close,
> +	.dev_reset = afu_rawdev_reset,
> +
> +	.queue_def_conf = NULL,
> +	.queue_setup = NULL,
> +	.queue_release = NULL,
> +	.queue_count = NULL,
> +
> +	.attr_get = NULL,
> +	.attr_set = NULL,
> +
> +	.enqueue_bufs = NULL,
> +	.dequeue_bufs = NULL,
> +
> +	.dump = afu_rawdev_dump,
> +
> +	.xstats_get = NULL,
> +	.xstats_get_names = NULL,
> +	.xstats_get_by_name = NULL,
> +	.xstats_reset = NULL,
> +
> +	.firmware_status_get = NULL,
> +	.firmware_version_get = NULL,
> +	.firmware_load = NULL,
> +	.firmware_unload = NULL,
> +
> +	.dev_selftest = afu_rawdev_selftest,
> +};
> +
> +static int afu_shared_data_alloc(const char *name,
> +	struct afu_shared_data **data, int socket_id) {
> +	const struct rte_memzone *mz;
> +	char mz_name[RTE_MEMZONE_NAMESIZE];
> +	struct afu_shared_data *sd = NULL;
> +	int init_mz = 0;
> +
> +	if (!name || !data)
> +		return -EINVAL;
> +
> +	/* name format is afu_?|??:??.? which is unique */
> +	snprintf(mz_name, sizeof(mz_name), "%s", name);
> +
> +	mz = rte_memzone_lookup(mz_name);
> +	if (!mz) {
> +		mz = rte_memzone_reserve(mz_name, sizeof(struct
> afu_shared_data),
> +				socket_id, 0);
> +		init_mz = 1;
> +	}
> +
> +	if (!mz) {
> +		IFPGA_RAWDEV_PMD_ERR("Allocate memory zone %s failed!",
> +			mz_name);
> +		return -ENOMEM;
> +	}
> +
> +	sd = (struct afu_shared_data *)mz->addr;
> +
> +	if (init_mz)  /* initialize memory zone on the first time */
> +		rte_spinlock_init(&sd->lock);
> +
> +	*data = sd;
> +
> +	return 0;
> +}
> +
> +static int afu_rawdev_name_get(struct rte_afu_device *afu_dev, char *name,
> +	size_t size)
> +{
> +	int n = 0;
> +
> +	if (!afu_dev || !name || !size)
> +		return -EINVAL;
> +
> +	n = snprintf(name, size, "afu_%s", afu_dev->device.name);
> +	if (n >= (int)size) {
> +		IFPGA_RAWDEV_PMD_ERR("Name of AFU device is too long!");
> +		return -ENAMETOOLONG;
> +	}
> +
> +	return 0;
> +}
> +
> +static struct afu_ops *afu_ops_get(struct rte_afu_uuid *afu_id) {
> +	struct afu_rawdev_drv *drv = NULL;
> +
> +	if (!afu_id)
> +		return NULL;
> +
> +	TAILQ_FOREACH(drv, &afu_pmd_list, next) {
> +		if ((drv->uuid.uuid_low == afu_id->uuid_low) &&
> +			(drv->uuid.uuid_high == afu_id->uuid_high))
> +			break;
> +	}
> +
> +	return drv ? drv->ops : NULL;
> +}
> +
> +static int afu_rawdev_create(struct rte_afu_device *afu_dev, int
> +socket_id) {
> +	struct rte_rawdev *rawdev = NULL;
> +	struct afu_rawdev *dev = NULL;
> +	char name[RTE_RAWDEV_NAME_MAX_LEN] = {0};
> +	int ret = 0;
> +
> +	if (!afu_dev)
> +		return -EINVAL;
> +
> +	ret = afu_rawdev_name_get(afu_dev, name, sizeof(name));
> +	if (ret)
> +		return ret;
> +
> +	IFPGA_RAWDEV_PMD_INFO("Create raw device %s on NUMA node
> %d",
> +		name, socket_id);
> +
> +	/* Allocate device structure */
> +	rawdev = rte_rawdev_pmd_allocate(name, sizeof(struct afu_rawdev),
> +				socket_id);
> +	if (!rawdev) {
> +		IFPGA_RAWDEV_PMD_ERR("Unable to allocate raw device");
> +		return -ENOMEM;
> +	}
> +
> +	rawdev->dev_ops = &afu_rawdev_ops;
> +	rawdev->device = &afu_dev->device;
> +	rawdev->driver_name = afu_dev->driver->driver.name;
> +
> +	dev = afu_rawdev_get_priv(rawdev);
> +	if (!dev)
> +		goto cleanup;
> +
> +	dev->rawdev = rawdev;
> +	dev->port = afu_dev->id.port;
> +	dev->addr = afu_dev->mem_resource[0].addr;
> +	dev->ops = afu_ops_get(&afu_dev->id.uuid);
> +	if (dev->ops == NULL) {
> +		IFPGA_RAWDEV_PMD_ERR("Unsupported AFU device");
> +		goto cleanup;
> +	}
> +
> +	if (dev->ops->init) {
> +		ret = (*dev->ops->init)(dev);
> +		if (ret) {
> +			IFPGA_RAWDEV_PMD_ERR("Failed to init %s", name);
> +			goto cleanup;
> +		}
> +	}
> +
> +	ret = afu_shared_data_alloc(name, &dev->sd, socket_id);
> +	if (ret)
> +		goto cleanup;
> +
> +	return ret;
> +
> +cleanup:
> +	rte_rawdev_pmd_release(rawdev);
> +	return ret;
> +}
> +
> +static int afu_rawdev_destroy(struct rte_afu_device *afu_dev) {
> +	struct rte_rawdev *rawdev = NULL;
> +	char name[RTE_RAWDEV_NAME_MAX_LEN] = {0};
> +	int ret = 0;
> +
> +	if (!afu_dev)
> +		return -EINVAL;
> +
> +	ret = afu_rawdev_name_get(afu_dev, name, sizeof(name));
> +	if (ret)
> +		return ret;
> +
> +	IFPGA_RAWDEV_PMD_INFO("Destroy raw device %s", name);
> +
> +	rawdev = rte_rawdev_pmd_get_named_dev(name);
> +	if (!rawdev) {
> +		IFPGA_RAWDEV_PMD_ERR("Raw device %s not found", name);
> +		return -EINVAL;
> +	}
> +
> +	/* rte_rawdev_close is called by pmd_release */
> +	ret = rte_rawdev_pmd_release(rawdev);
> +	if (ret)
> +		IFPGA_RAWDEV_PMD_DEBUG("Device cleanup failed");
> +
> +	return 0;
> +}
> +
> +static int afu_rawdev_probe(struct rte_afu_device *afu_dev) {
> +	IFPGA_RAWDEV_PMD_FUNC_TRACE();
> +	return afu_rawdev_create(afu_dev, rte_socket_id()); }
> +
> +static int afu_rawdev_remove(struct rte_afu_device *afu_dev) {
> +	IFPGA_RAWDEV_PMD_FUNC_TRACE();
> +	return afu_rawdev_destroy(afu_dev);
> +}
> +
> +static struct rte_afu_driver afu_pmd = {
> +	.id_table = afu_pmd_uuid_map,
> +	.probe = afu_rawdev_probe,
> +	.remove = afu_rawdev_remove
> +};
> +
> +RTE_PMD_REGISTER_AFU(afu_rawdev_driver, afu_pmd);
> +
> +static void update_uuid_map(void)
> +{
> +	int i = 0;
> +	struct rte_afu_uuid *afu_id = afu_pmd_uuid_map;
> +	struct afu_rawdev_drv *drv;
> +
> +	TAILQ_FOREACH(drv, &afu_pmd_list, next) {
> +		if (i++ < AFU_RAWDEV_MAX_DRVS) {
> +			afu_id->uuid_low = drv->uuid.uuid_low;
> +			afu_id->uuid_high = drv->uuid.uuid_high;
> +			afu_id++;
> +		}
> +	}
> +	if (i <= AFU_RAWDEV_MAX_DRVS) {
> +		afu_id->uuid_low = 0;
> +		afu_id->uuid_high = 0;
> +	}
> +}
> +
> +void afu_pmd_register(struct afu_rawdev_drv *driver) {
> +	TAILQ_INSERT_TAIL(&afu_pmd_list, driver, next);
> +	update_uuid_map();
> +}
> +
> +void afu_pmd_unregister(struct afu_rawdev_drv *driver) {
> +	TAILQ_REMOVE(&afu_pmd_list, driver, next);
> +	update_uuid_map();
> +}
> diff --git a/drivers/raw/ifpga/afu_pmd_core.h
> b/drivers/raw/ifpga/afu_pmd_core.h
> new file mode 100644
> index 0000000..4fad2c7
> --- /dev/null
> +++ b/drivers/raw/ifpga/afu_pmd_core.h
> @@ -0,0 +1,76 @@
> +/* SPDX-License-Identifier: BSD-3-Clause
> + * Copyright 2022 Intel Corporation
> + */
> +
> +#ifndef __AFU_PMD_CORE_H__
> +#define __AFU_PMD_CORE_H__
> +
> +#ifdef __cplusplus
> +extern "C" {
> +#endif
> +
> +#include <stdint.h>
> +#include <stdio.h>
> +#include <unistd.h>
> +
> +#include <rte_spinlock.h>
> +#include <rte_bus_ifpga.h>
> +#include <rte_rawdev.h>
> +
> +#include "ifpga_rawdev.h"
> +
> +#define AFU_RAWDEV_MAX_DRVS  32
> +
> +struct afu_rawdev;
> +
> +struct afu_ops {
> +	int (*init)(struct afu_rawdev *dev);
> +	int (*config)(struct afu_rawdev *dev, void *config,
> +		size_t config_size);
> +	int (*start)(struct afu_rawdev *dev);
> +	int (*stop)(struct afu_rawdev *dev);
> +	int (*test)(struct afu_rawdev *dev);
> +	int (*close)(struct afu_rawdev *dev);
> +	int (*reset)(struct afu_rawdev *dev);
> +	int (*dump)(struct afu_rawdev *dev, FILE *f); };
> +
> +struct afu_shared_data {
> +	rte_spinlock_t lock;  /* lock for multi-process access */ };
> +
> +struct afu_rawdev_drv {
> +	TAILQ_ENTRY(afu_rawdev_drv) next;
> +	struct rte_afu_uuid uuid;
> +	struct afu_ops *ops;
> +};
> +
> +struct afu_rawdev {
> +	struct rte_rawdev *rawdev;  /* point to parent raw device */
> +	struct afu_shared_data *sd;  /* shared data for multi-process */
> +	struct afu_ops *ops;  /* device operation functions */
> +	int port;  /* index of port the AFU attached */
> +	void *addr;  /* base address of AFU registers */
> +	void *priv;  /* private driver data */ };
> +
> +static inline struct afu_rawdev *
> +afu_rawdev_get_priv(const struct rte_rawdev *rawdev) {
> +	return rawdev ? (struct afu_rawdev *)rawdev->dev_private : NULL; }
> +
> +void afu_pmd_register(struct afu_rawdev_drv *driver); void
> +afu_pmd_unregister(struct afu_rawdev_drv *driver);
> +
> +#define AFU_PMD_REGISTER(drv)\
> +RTE_INIT(afupmdinitfunc_ ##drv)\
> +{\
> +	afu_pmd_register(&drv);\
> +}
> +
> +#ifdef __cplusplus
> +}
> +#endif
> +
> +#endif /* __AFU_PMD_CORE_H__ */
> diff --git a/drivers/raw/ifpga/meson.build b/drivers/raw/ifpga/meson.build
> index aeccc17..d9a6f29 100644
> --- a/drivers/raw/ifpga/meson.build
> +++ b/drivers/raw/ifpga/meson.build
> @@ -13,7 +13,7 @@ objs = [base_objs]
>  deps += ['ethdev', 'rawdev', 'pci', 'bus_pci', 'kvargs',
>      'bus_vdev', 'bus_ifpga', 'net', 'net_i40e', 'net_ipn3ke']
> 
> -sources = files('ifpga_rawdev.c', 'rte_pmd_ifpga.c')
> +sources = files('ifpga_rawdev.c', 'rte_pmd_ifpga.c', 'afu_pmd_core.c')
> 
>  includes += include_directories('base')  includes +=
> include_directories('../../net/ipn3ke')
> --
> 1.8.3.1

It looks good for me, you can add:
Acked-by: Tianfei Zhang <tianfei.zhang@intel.com>