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From: Maxime Coquelin <maxime.coquelin@redhat.com>
To: Adrian Moreno <amorenoz@redhat.com>,
	dev@dpdk.org, matan@mellanox.com, xiao.w.wang@intel.com,
	zhihong.wang@intel.com, xiaolong.ye@intel.com,
	chenbo.xia@intel.com, david.marchand@redhat.com,
	shreyansh.jain@nxp.com, viacheslavo@mellanox.com,
	hemant.agrawal@nxp.com, sachin.saxena@nxp.com
Subject: Re: [dpdk-dev] [PATCH 04/14] vhost: make vDPA framework bus agnostic
Date: Fri, 19 Jun 2020 17:11:15 +0200
Message-ID: <94b8f54b-7114-df23-0281-ad06abcec8e5@redhat.com> (raw)
In-Reply-To: <aa68505d-a417-61bd-e713-fcd9933f9015@redhat.com>



On 6/19/20 1:14 PM, Adrian Moreno wrote:
> 
> 
> On 6/11/20 11:37 PM, Maxime Coquelin wrote:
>> This patch makes the vDPA framework to no more
>> support only PCI devices, but any devices by relying
>> on the generic device name as identifier.
>>
>> Signed-off-by: Maxime Coquelin <maxime.coquelin@redhat.com>
>> ---
>>  drivers/vdpa/ifc/ifcvf_vdpa.c          |  6 +-
>>  drivers/vdpa/mlx5/mlx5_vdpa.c          |  8 +--
>>  drivers/vdpa/mlx5/mlx5_vdpa.h          |  2 +-
>>  examples/vdpa/main.c                   | 49 ++++++++--------
>>  lib/librte_vhost/rte_vdpa.h            | 42 +++++++-------
>>  lib/librte_vhost/rte_vhost_version.map |  1 +
>>  lib/librte_vhost/vdpa.c                | 79 +++++++++++---------------
>>  7 files changed, 85 insertions(+), 102 deletions(-)
>>
>> diff --git a/drivers/vdpa/ifc/ifcvf_vdpa.c b/drivers/vdpa/ifc/ifcvf_vdpa.c
>> index ec97178dcb..1fec1f1baf 100644
>> --- a/drivers/vdpa/ifc/ifcvf_vdpa.c
>> +++ b/drivers/vdpa/ifc/ifcvf_vdpa.c
>> @@ -47,7 +47,6 @@ static const char * const ifcvf_valid_arguments[] = {
>>  static int ifcvf_vdpa_logtype;
>>  
>>  struct ifcvf_internal {
>> -	struct rte_vdpa_dev_addr dev_addr;
>>  	struct rte_pci_device *pdev;
>>  	struct ifcvf_hw hw;
>>  	int vfio_container_fd;
>> @@ -1176,8 +1175,6 @@ ifcvf_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
>>  		(1ULL << VHOST_USER_F_PROTOCOL_FEATURES) |
>>  		(1ULL << VHOST_F_LOG_ALL);
>>  
>> -	internal->dev_addr.pci_addr = pci_dev->addr;
>> -	internal->dev_addr.type = VDPA_ADDR_PCI;
>>  	list->internal = internal;
>>  
>>  	if (rte_kvargs_count(kvlist, IFCVF_SW_FALLBACK_LM)) {
>> @@ -1188,8 +1185,7 @@ ifcvf_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
>>  	}
>>  	internal->sw_lm = sw_fallback_lm;
>>  
>> -	internal->did = rte_vdpa_register_device(&internal->dev_addr,
>> -				&ifcvf_ops);
>> +	internal->did = rte_vdpa_register_device(&pci_dev->device, &ifcvf_ops);
>>  	if (internal->did < 0) {
>>  		DRV_LOG(ERR, "failed to register device %s", pci_dev->name);
>>  		goto error;
>> diff --git a/drivers/vdpa/mlx5/mlx5_vdpa.c b/drivers/vdpa/mlx5/mlx5_vdpa.c
>> index 1113d6cef0..e8255c7d7e 100644
>> --- a/drivers/vdpa/mlx5/mlx5_vdpa.c
>> +++ b/drivers/vdpa/mlx5/mlx5_vdpa.c
>> @@ -501,14 +501,13 @@ mlx5_vdpa_pci_probe(struct rte_pci_driver *pci_drv __rte_unused,
>>  	priv->caps = attr.vdpa;
>>  	priv->log_max_rqt_size = attr.log_max_rqt_size;
>>  	priv->ctx = ctx;
>> -	priv->dev_addr.pci_addr = pci_dev->addr;
>> -	priv->dev_addr.type = VDPA_ADDR_PCI;
>> +	priv->pci_dev = pci_dev;
>>  	priv->var = mlx5_glue->dv_alloc_var(ctx, 0);
>>  	if (!priv->var) {
>>  		DRV_LOG(ERR, "Failed to allocate VAR %u.\n", errno);
>>  		goto error;
>>  	}
>> -	priv->id = rte_vdpa_register_device(&priv->dev_addr, &mlx5_vdpa_ops);
>> +	priv->id = rte_vdpa_register_device(&pci_dev->device, &mlx5_vdpa_ops);
>>  	if (priv->id < 0) {
>>  		DRV_LOG(ERR, "Failed to register vDPA device.");
>>  		rte_errno = rte_errno ? rte_errno : EINVAL;
>> @@ -550,8 +549,7 @@ mlx5_vdpa_pci_remove(struct rte_pci_device *pci_dev)
>>  
>>  	pthread_mutex_lock(&priv_list_lock);
>>  	TAILQ_FOREACH(priv, &priv_list, next) {
>> -		if (memcmp(&priv->dev_addr.pci_addr, &pci_dev->addr,
>> -			   sizeof(pci_dev->addr)) == 0) {
>> +		if (priv->pci_dev == pci_dev) {
>>  			found = 1;
>>  			break;
>>  		}
>> diff --git a/drivers/vdpa/mlx5/mlx5_vdpa.h b/drivers/vdpa/mlx5/mlx5_vdpa.h
>> index fcc216ac78..50ee3c5870 100644
>> --- a/drivers/vdpa/mlx5/mlx5_vdpa.h
>> +++ b/drivers/vdpa/mlx5/mlx5_vdpa.h
>> @@ -104,7 +104,7 @@ struct mlx5_vdpa_priv {
>>  	int id; /* vDPA device id. */
>>  	int vid; /* vhost device id. */
>>  	struct ibv_context *ctx; /* Device context. */
>> -	struct rte_vdpa_dev_addr dev_addr;
>> +	struct rte_pci_device *pci_dev;
>>  	struct mlx5_hca_vdpa_attr caps;
>>  	uint32_t pdn; /* Protection Domain number. */
>>  	struct ibv_pd *pd;
>> diff --git a/examples/vdpa/main.c b/examples/vdpa/main.c
>> index d9a9112b16..c12da69574 100644
>> --- a/examples/vdpa/main.c
>> +++ b/examples/vdpa/main.c
>> @@ -271,10 +271,14 @@ static void cmd_list_vdpa_devices_parsed(
>>  	uint32_t queue_num;
>>  	uint64_t features;
>>  	struct rte_vdpa_device *vdev;
>> -	struct rte_pci_addr addr;
>> +	struct rte_device *dev;
>> +	struct rte_dev_iterator dev_iter;
>>  
>> -	cmdline_printf(cl, "device id\tdevice address\tqueue num\tsupported features\n");
>> -	for (did = 0; did < dev_total; did++) {
>> +	cmdline_printf(cl, "device id\tdevice name\tqueue num\tsupported features\n");
>> +	RTE_DEV_FOREACH(dev, "class=vdpa", &dev_iter) {
>> +		did = rte_vdpa_find_device_id_by_name(dev->name);
>> +		if (did < 0)
>> +			continue;
>>  		vdev = rte_vdpa_get_device(did);
>>  		if (!vdev)
>>  			continue;
>> @@ -290,11 +294,8 @@ static void cmd_list_vdpa_devices_parsed(
>>  				"for device id %d.\n", did);
>>  			continue;
>>  		}
>> -		addr = vdev->addr.pci_addr;
>> -		cmdline_printf(cl,
>> -			"%d\t\t" PCI_PRI_FMT "\t%" PRIu32 "\t\t0x%" PRIx64 "\n",
>> -			did, addr.domain, addr.bus, addr.devid,
>> -			addr.function, queue_num, features);
>> +		cmdline_printf(cl, "%d\t\t%s\t\t%" PRIu32 "\t\t0x%" PRIx64 "\n",
>> +			did, dev->name, queue_num, features);
>>  	}
>>  }
>>  
>> @@ -324,17 +325,12 @@ static void cmd_create_vdpa_port_parsed(void *parsed_result,
>>  {
>>  	int did;
>>  	struct cmd_create_result *res = parsed_result;
>> -	struct rte_vdpa_dev_addr addr;
>>  
>>  	rte_strscpy(vports[devcnt].ifname, res->socket_path, MAX_PATH_LEN);
>> -	if (rte_pci_addr_parse(res->bdf, &addr.pci_addr) != 0) {
>> -		cmdline_printf(cl, "Unable to parse the given bdf.\n");
>> -		return;
>> -	}
>> -	addr.type = VDPA_ADDR_PCI;
>> -	did = rte_vdpa_find_device_id(&addr);
>> +	did = rte_vdpa_find_device_id_by_name(res->bdf);
>>  	if (did < 0) {
>> -		cmdline_printf(cl, "Unable to find vdpa device id.\n");
>> +		cmdline_printf(cl, "Unable to find vdpa device id for %s.\n",
>> +				res->bdf);
>>  		return;
>>  	}
>>  
>> @@ -400,9 +396,11 @@ int
>>  main(int argc, char *argv[])
>>  {
>>  	char ch;
>> -	int i;
>> +	int did;
>>  	int ret;
>>  	struct cmdline *cl;
>> +	struct rte_device *dev;
>> +	struct rte_dev_iterator dev_iter;
>>  
>>  	ret = rte_eal_init(argc, argv);
>>  	if (ret < 0)
>> @@ -428,13 +426,18 @@ main(int argc, char *argv[])
>>  		cmdline_interact(cl);
>>  		cmdline_stdin_exit(cl);
>>  	} else {
>> -		for (i = 0; i < RTE_MIN(MAX_VDPA_SAMPLE_PORTS, dev_total);
>> -				i++) {
>> -			vports[i].did = i;
>> -			snprintf(vports[i].ifname, MAX_PATH_LEN, "%s%d",
>> -					iface, i);
>> +		RTE_DEV_FOREACH(dev, "class=vdpa", &dev_iter) {
>> +			did = rte_vdpa_find_device_id_by_name(dev->name);
>> +			if (did < 0) {
>> +				rte_panic("Failed to find device id for %s\n",
>> +						dev->name);
>> +			}
>> +			vports[devcnt].did = did;
>> +			snprintf(vports[devcnt].ifname, MAX_PATH_LEN, "%s%d",
>> +					iface, devcnt);
>>  
>> -			start_vdpa(&vports[i]);
>> +			start_vdpa(&vports[devcnt]);
>> +			devcnt++;
>>  		}
>>  
>>  		printf("enter \'q\' to quit\n");
>> diff --git a/lib/librte_vhost/rte_vdpa.h b/lib/librte_vhost/rte_vdpa.h
>> index 3c400ee79b..33037d39ea 100644
>> --- a/lib/librte_vhost/rte_vdpa.h
>> +++ b/lib/librte_vhost/rte_vdpa.h
>> @@ -18,25 +18,6 @@
>>  
>>  #define MAX_VDPA_NAME_LEN 128
>>  
>> -enum vdpa_addr_type {
>> -	VDPA_ADDR_PCI,
>> -	VDPA_ADDR_MAX
>> -};
>> -
>> -/**
>> - * vdpa device address
>> - */
>> -struct rte_vdpa_dev_addr {
>> -	/** vdpa address type */
>> -	enum vdpa_addr_type type;
>> -
>> -	/** vdpa pci address */
>> -	union {
>> -		uint8_t __dummy[64];
>> -		struct rte_pci_addr pci_addr;
>> -	};
>> -};
>> -
>>  /**
>>   * vdpa device operations
>>   */
>> @@ -81,8 +62,8 @@ struct rte_vdpa_dev_ops {
>>   * vdpa device structure includes device address and device operations.
>>   */
>>  struct rte_vdpa_device {
>> -	/** vdpa device address */
>> -	struct rte_vdpa_dev_addr addr;
>> +	/** Generic device information */
>> +	struct rte_device *device;
>>  	/** vdpa device operations */
>>  	struct rte_vdpa_dev_ops *ops;
>>  } __rte_cache_aligned;
>> @@ -102,7 +83,7 @@ struct rte_vdpa_device {
>>   */
>>  __rte_experimental
>>  int
>> -rte_vdpa_register_device(struct rte_vdpa_dev_addr *addr,
>> +rte_vdpa_register_device(struct rte_device *rte_dev,
>>  		struct rte_vdpa_dev_ops *ops);
>>  
>>  /**
>> @@ -120,6 +101,21 @@ __rte_experimental
>>  int
>>  rte_vdpa_unregister_device(int did);
>>  
>> +/**
>> + * @warning
>> + * @b EXPERIMENTAL: this API may change without prior notice
>> + *
>> + * Find the device id of a vdpa device from its name
>> + *
>> + * @param name
>> + *  the vdpa device name
>> + * @return
>> + *  device id on success, -1 on failure
>> + */
>> +__rte_experimental
>> +int
>> +rte_vdpa_find_device_id_by_name(const char *name);
>> +
>>  /**
>>   * @warning
>>   * @b EXPERIMENTAL: this API may change without prior notice
>> @@ -133,7 +129,7 @@ rte_vdpa_unregister_device(int did);
>>   */
>>  __rte_experimental
>>  int
>> -rte_vdpa_find_device_id(struct rte_vdpa_dev_addr *addr);
>> +rte_vdpa_find_device_id(struct rte_vdpa_device *dev);
>>  
>>  /**
>>   * @warning
>> diff --git a/lib/librte_vhost/rte_vhost_version.map b/lib/librte_vhost/rte_vhost_version.map
>> index 051d08c120..1abfff8a0c 100644
>> --- a/lib/librte_vhost/rte_vhost_version.map
>> +++ b/lib/librte_vhost/rte_vhost_version.map
>> @@ -66,4 +66,5 @@ EXPERIMENTAL {
>>  	rte_vhost_get_vhost_ring_inflight;
>>  	rte_vhost_get_vring_base_from_inflight;
>>  	rte_vhost_slave_config_change;
>> +	rte_vdpa_find_device_id_by_name;
>>  };
>> diff --git a/lib/librte_vhost/vdpa.c b/lib/librte_vhost/vdpa.c
>> index 61ab9aadb4..5abc5a2a7c 100644
>> --- a/lib/librte_vhost/vdpa.c
>> +++ b/lib/librte_vhost/vdpa.c
>> @@ -18,43 +18,22 @@
>>  static struct rte_vdpa_device vdpa_devices[MAX_VHOST_DEVICE];
>>  static uint32_t vdpa_device_num;
>>  
>> -static bool
>> -is_same_vdpa_device(struct rte_vdpa_dev_addr *a,
>> -		struct rte_vdpa_dev_addr *b)
>> -{
>> -	bool ret = true;
>> -
>> -	if (a->type != b->type)
>> -		return false;
>> -
>> -	switch (a->type) {
>> -	case VDPA_ADDR_PCI:
>> -		if (a->pci_addr.domain != b->pci_addr.domain ||
>> -				a->pci_addr.bus != b->pci_addr.bus ||
>> -				a->pci_addr.devid != b->pci_addr.devid ||
>> -				a->pci_addr.function != b->pci_addr.function)
>> -			ret = false;
>> -		break;
>> -	default:
>> -		break;
>> -	}
>> -
>> -	return ret;
>> -}
>> -
>>  int
>> -rte_vdpa_register_device(struct rte_vdpa_dev_addr *addr,
>> +rte_vdpa_register_device(struct rte_device *rte_dev,
>>  		struct rte_vdpa_dev_ops *ops)
>>  {
>>  	struct rte_vdpa_device *dev;
>>  	int i;
>>  
>> -	if (vdpa_device_num >= MAX_VHOST_DEVICE || addr == NULL || ops == NULL)
>> +	if (vdpa_device_num >= MAX_VHOST_DEVICE || ops == NULL)
>>  		return -1;
>>  
>>  	for (i = 0; i < MAX_VHOST_DEVICE; i++) {
>>  		dev = &vdpa_devices[i];
>> -		if (dev->ops && is_same_vdpa_device(&dev->addr, addr))
>> +		if (dev->ops == NULL)
>> +			continue;
>> +
>> +		if (dev->device == rte_dev)
>>  			return -1;
>>  	}
> 
> If we change the order of the two "if" statemets and replace "continue" with
> "break", we can remove the for loop that follows:
> 
> 	for (i = 0; i < MAX_VHOST_DEVICE; i++) {
> 		if (vdpa_devices[i].ops == NULL)
> 			break;
> 	}

Do you mean like this?

	for (i = 0; i < MAX_VHOST_DEVICE; i++) {
		if (dev->device == rte_dev)
			return -1;

		if (vdpa_devices[i].ops == NULL)
			break;
	}

If so the behaviour will be different, because you can have holes in the
array if a device is unregistered.

With above change it would stop looking if device is already registered
at the first hole, so could end into double registration of the same
device.

> 
>>  
>> @@ -67,7 +46,7 @@ rte_vdpa_register_device(struct rte_vdpa_dev_addr *addr,
>>  		return -1;
>>  
>>  	dev = &vdpa_devices[i];
>> -	memcpy(&dev->addr, addr, sizeof(struct rte_vdpa_dev_addr));
>> +	dev->device = rte_dev;
>>  	dev->ops = ops;
>>  	vdpa_device_num++;
>>  
>> @@ -87,12 +66,33 @@ rte_vdpa_unregister_device(int did)
>>  }
>>  
>>  int
>> -rte_vdpa_find_device_id(struct rte_vdpa_dev_addr *addr)
>> +rte_vdpa_find_device_id(struct rte_vdpa_device *dev)
>> +{
>> +	struct rte_vdpa_device *tmp_dev;
>> +	int i;
>> +
>> +	if (dev == NULL)
>> +		return -1;
>> +
>> +	for (i = 0; i < MAX_VHOST_DEVICE; ++i) {
>> +		tmp_dev = &vdpa_devices[i];
>> +		if (tmp_dev->ops == NULL)
>> +			continue;
>> +
>> +		if (tmp_dev == dev)
>> +			return i;
>> +	}
>> +
>> +	return -1;
>> +}
>> +
>> +int
>> +rte_vdpa_find_device_id_by_name(const char *name)
>>  {
>>  	struct rte_vdpa_device *dev;
>>  	int i;
>>  
>> -	if (addr == NULL)
>> +	if (name == NULL)
>>  		return -1;
>>  
>>  	for (i = 0; i < MAX_VHOST_DEVICE; ++i) {
>> @@ -100,7 +100,7 @@ rte_vdpa_find_device_id(struct rte_vdpa_dev_addr *addr)
>>  		if (dev->ops == NULL)
>>  			continue;
>>  
>> -		if (is_same_vdpa_device(&dev->addr, addr))
>> +		if (strcmp(dev->device->name, name) == 0)
>>  			return i;
>>  	}
>>  
>> @@ -236,21 +236,10 @@ static int
>>  vdpa_dev_match(struct rte_vdpa_device *dev,
>>  	      const struct rte_device *rte_dev)
>>  {
>> -	struct rte_vdpa_dev_addr addr;
>> +	if (dev->device == rte_dev)
>> +		return 0;
>>  
>> -	/*  Only PCI bus supported for now */
>> -	if (strcmp(rte_dev->bus->name, "pci") != 0)
>> -		return -1;
>> -
>> -	addr.type = VDPA_ADDR_PCI;
>> -
>> -	if (rte_pci_addr_parse(rte_dev->name, &addr.pci_addr) != 0)
>> -		return -1;
>> -
>> -	if (!is_same_vdpa_device(&dev->addr, &addr))
>> -		return -1;
>> -
>> -	return 0;
>> +	return -1;
>>  }
>>  
>>  /* Generic rte_vdpa_dev comparison function. */
>>
> 


  reply	other threads:[~2020-06-19 15:11 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-11 21:37 [dpdk-dev] [PATCH 00/14] vDPA API and framework rework Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 01/14] bus/dpaa: fix null pointer dereference Maxime Coquelin
2020-06-12  9:48   ` Gaëtan Rivet
2020-06-11 21:37 ` [dpdk-dev] [PATCH 02/14] bus/fslmc: " Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 03/14] vhost: introduce vDPA devices class Maxime Coquelin
2020-06-12 12:37   ` Gaëtan Rivet
2020-06-15  9:15     ` Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 04/14] vhost: make vDPA framework bus agnostic Maxime Coquelin
2020-06-12 12:46   ` Gaëtan Rivet
2020-06-15  9:17     ` Maxime Coquelin
2020-06-19 11:14   ` Adrian Moreno
2020-06-19 15:11     ` Maxime Coquelin [this message]
2020-06-22  9:49       ` Adrian Moreno
2020-06-22 12:34         ` Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 05/14] vhost: replace device ID in vDPA ops Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 06/14] vhost: replace vDPA device ID in Vhost Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 07/14] vhost: replace device ID in applications Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 08/14] vhost: remove useless vDPA API Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 09/14] vhost: use linked-list for vDPA devices Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 10/14] vhost: introduce wrappers for some vDPA ops Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 11/14] examples/vdpa: use new wrappers instead of ops Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 12/14] examples/vdpa: remove useless device count Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 13/14] vhost: remove vDPA device count API Maxime Coquelin
2020-06-11 21:37 ` [dpdk-dev] [PATCH 14/14] vhost: split vDPA header file Maxime Coquelin
2020-06-12  9:38 ` [dpdk-dev] [PATCH 00/14] vDPA API and framework rework Gaëtan Rivet

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	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 dev dev/ https://inbox.dpdk.org/dev \
		dev@dpdk.org
	public-inbox-index dev

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.dev


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git