diff mbox

[dpdk-dev,v6,12/13] eal/pci: Add rte_eal_dev_attach/detach() functions

Message ID 1422763322-13742-13-git-send-email-mukawa@igel.co.jp (mailing list archive)
State Superseded, archived
Headers show

Commit Message

Tetsuya Mukawa Feb. 1, 2015, 4:01 a.m. UTC
These functions are used for attaching or detaching a port.
When rte_eal_dev_attach() is called, the function tries to realize the
device name as pci address. If this is done successfully,
rte_eal_dev_attach() will attach physical device port. If not, attaches
virtual devive port.
When rte_eal_dev_detach() is called, the function gets the device type
of this port to know whether the port is came from physical or virtual.
And then specific detaching function will be called.

v5:
- Change function names like below.
  rte_eal_dev_find_and_invoke() to rte_eal_vdev_find_and_invoke().
  rte_eal_dev_invoke() to rte_eal_vdev_invoke().
- Add code to handle a return value of rte_eal_devargs_remove().
- Fix pci address format in rte_eal_dev_detach().
v4:
- Fix comment.
- Add error checking.
- Fix indent of 'if' statement.
- Change function name.

Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>
---
 lib/librte_eal/common/eal_common_dev.c  | 274 ++++++++++++++++++++++++++++++++
 lib/librte_eal/common/eal_private.h     |  11 ++
 lib/librte_eal/common/include/rte_dev.h |  33 ++++
 lib/librte_eal/linuxapp/eal/Makefile    |   1 +
 lib/librte_eal/linuxapp/eal/eal_pci.c   |   6 +-
 5 files changed, 322 insertions(+), 3 deletions(-)

Comments

Michael Qiu Feb. 2, 2015, 5:42 a.m. UTC | #1
On 2/1/2015 12:02 PM, Tetsuya Mukawa wrote:
> These functions are used for attaching or detaching a port.
> When rte_eal_dev_attach() is called, the function tries to realize the
> device name as pci address. If this is done successfully,
> rte_eal_dev_attach() will attach physical device port. If not, attaches
> virtual devive port.
> When rte_eal_dev_detach() is called, the function gets the device type
> of this port to know whether the port is came from physical or virtual.
> And then specific detaching function will be called.
>
> v5:
> - Change function names like below.
>   rte_eal_dev_find_and_invoke() to rte_eal_vdev_find_and_invoke().
>   rte_eal_dev_invoke() to rte_eal_vdev_invoke().
> - Add code to handle a return value of rte_eal_devargs_remove().
> - Fix pci address format in rte_eal_dev_detach().
> v4:
> - Fix comment.
> - Add error checking.
> - Fix indent of 'if' statement.
> - Change function name.
>
> Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>
> ---
>  lib/librte_eal/common/eal_common_dev.c  | 274 ++++++++++++++++++++++++++++++++
>  lib/librte_eal/common/eal_private.h     |  11 ++
>  lib/librte_eal/common/include/rte_dev.h |  33 ++++
>  lib/librte_eal/linuxapp/eal/Makefile    |   1 +
>  lib/librte_eal/linuxapp/eal/eal_pci.c   |   6 +-
>  5 files changed, 322 insertions(+), 3 deletions(-)
>
> diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c
> index eae5656..e3a3f54 100644
> --- a/lib/librte_eal/common/eal_common_dev.c
> +++ b/lib/librte_eal/common/eal_common_dev.c
> @@ -32,10 +32,13 @@
>   *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
>   */
>  
> +#include <stdio.h>
> +#include <limits.h>
>  #include <string.h>
>  #include <inttypes.h>
>  #include <sys/queue.h>
>  
> +#include <rte_ethdev.h>
>  #include <rte_dev.h>
>  #include <rte_devargs.h>
>  #include <rte_debug.h>
> @@ -107,3 +110,274 @@ rte_eal_dev_init(void)
>  	}
>  	return 0;
>  }
> +
> +/* So far, DPDK hotplug function only supports linux */
> +#ifdef ENABLE_HOTPLUG
> +static void
> +rte_eal_vdev_invoke(struct rte_driver *driver,
> +		struct rte_devargs *devargs, enum rte_eal_invoke_type type)
> +{
> +	if ((driver == NULL) || (devargs == NULL))
> +		return;
> +
> +	switch (type) {
> +	case RTE_EAL_INVOKE_TYPE_PROBE:
> +		driver->init(devargs->virtual.drv_name, devargs->args);
> +		break;
> +	case RTE_EAL_INVOKE_TYPE_CLOSE:
> +		driver->uninit(devargs->virtual.drv_name, devargs->args);
> +		break;
> +	default:
> +		break;
> +	}
> +}
> +
> +static int
> +rte_eal_vdev_find_and_invoke(const char *name, int type)
> +{
> +	struct rte_devargs *devargs;
> +	struct rte_driver *driver;
> +
> +	if (name == NULL)
> +		return -EINVAL;
> +
> +	/* call the init function for each virtual device */
> +	TAILQ_FOREACH(devargs, &devargs_list, next) {
> +
> +		if (devargs->type != RTE_DEVTYPE_VIRTUAL)
> +			continue;
> +
> +		if (strncmp(name, devargs->virtual.drv_name, strlen(name)))
> +			continue;
> +
> +		TAILQ_FOREACH(driver, &dev_driver_list, next) {
> +			if (driver->type != PMD_VDEV)
> +				continue;
> +
> +			/* search a driver prefix in virtual device name */
> +			if (!strncmp(driver->name, devargs->virtual.drv_name,
> +			    strlen(driver->name))) {
> +				rte_eal_vdev_invoke(driver, devargs, type);
> +				break;
> +			}
> +		}
> +
> +		if (driver == NULL) {
> +			RTE_LOG(WARNING, EAL, "no driver found for %s\n",
> +				  devargs->virtual.drv_name);
> +		}
> +		return 0;
> +	}
> +	return 1;
> +}
> +
> +/* attach the new physical device, then store port_id of the device */
> +static int
> +rte_eal_dev_attach_pdev(struct rte_pci_addr *addr, uint8_t *port_id)
> +{
> +	uint8_t new_port_id;
> +	struct rte_eth_dev devs[RTE_MAX_ETHPORTS];
> +
> +	if ((addr == NULL) || (port_id == NULL))
> +		goto err;
> +
> +	/* save current port status */
> +	rte_eth_dev_save(devs);
> +	/* re-construct pci_device_list */
> +	if (rte_eal_pci_scan())
> +		goto err;
> +	/* invoke probe func of the driver can handle the new device */
> +	if (rte_eal_pci_probe_one(addr))
> +		goto err;
> +	/* get port_id enabled by above procedures */
> +	if (rte_eth_dev_get_changed_port(devs, &new_port_id))
> +		goto err;
> +
> +	*port_id = new_port_id;
> +	return 0;
> +err:
> +	RTE_LOG(ERR, EAL, "Drver, cannot attach the device\n");

Sorry, what does "Drver" means?

My English is bad, also I haven't gotten this work in google

Thanks,
Michael
> +	return -1;
> +}
> +
> +/* detach the new physical device, then store pci_addr of the device */
> +static int
> +rte_eal_dev_detach_pdev(uint8_t port_id, struct rte_pci_addr *addr)
> +{
> +	struct rte_pci_addr freed_addr;
> +	struct rte_pci_addr vp;
> +
> +	if (addr == NULL)
> +		goto err;
> +
> +	/* check whether the driver supports detach feature, or not */
> +	if (rte_eth_dev_check_detachable(port_id))
> +		goto err;
> +
> +	/* get pci address by port id */
> +	if (rte_eth_dev_get_addr_by_port(port_id, &freed_addr))
> +		goto err;
> +
> +	/* Zerod pci addr means the port comes from virtual device */
> +	vp.domain = vp.bus = vp.devid = vp.function = 0;
> +	if (eal_compare_pci_addr(&vp, &freed_addr) == 0)
> +		goto err;
> +
> +	/* invoke close func of the driver,
> +	 * also remove the device from pci_device_list */
> +	if (rte_eal_pci_close_one(&freed_addr))
> +		goto err;
> +
> +	*addr = freed_addr;
> +	return 0;
> +err:
> +	RTE_LOG(ERR, EAL, "Drver, cannot detach the device\n");

Here, "Drver"
> +	return -1;
> +}
> +
> +static void
> +get_vdev_name(char *vdevargs)
> +{
> +	char *sep;
> +
> +	if (vdevargs == NULL)
> +		return;
> +
> +	/* set the first ',' to '\0' to split name and arguments */
> +	sep = strchr(vdevargs, ',');
> +	if (sep != NULL)
> +		sep[0] = '\0';
> +}
> +
> +/* attach the new virtual device, then store port_id of the device */
> +static int
> +rte_eal_dev_attach_vdev(const char *vdevargs, uint8_t *port_id)
> +{
> +	char *args;
> +	uint8_t new_port_id;
> +	struct rte_eth_dev devs[RTE_MAX_ETHPORTS];
> +
> +	if ((vdevargs == NULL) || (port_id == NULL))
> +		goto err0;
> +
> +	args = strdup(vdevargs);
> +	if (args == NULL)
> +		goto err0;
> +
> +	/* save current port status */
> +	rte_eth_dev_save(devs);
> +	/* add the vdevargs to devargs_list */
> +	if (rte_eal_devargs_add(RTE_DEVTYPE_VIRTUAL, args))
> +		goto err1;
> +	/* parse vdevargs, then retrieve device name */
> +	get_vdev_name(args);
> +	/* walk around dev_driver_list to find the driver of the device,
> +	 * then invoke probe function o the driver */
> +	if (rte_eal_vdev_find_and_invoke(args, RTE_EAL_INVOKE_TYPE_PROBE))
> +		goto err2;
> +	/* get port_id enabled by above procedures */
> +	if (rte_eth_dev_get_changed_port(devs, &new_port_id))
> +		goto err2;
> +
> +	free(args);
> +	*port_id = new_port_id;
> +	return 0;
> +err2:
> +	rte_eal_devargs_remove(RTE_DEVTYPE_VIRTUAL, args);
> +err1:
> +	free(args);
> +err0:
> +	RTE_LOG(ERR, EAL, "Drver, cannot detach the device\n");

Here also "Drver",


Thanks,
Michael
> +	return -1;
> +}
> +
> +/* detach the new virtual device, then store the name of the device */
> +static int
> +rte_eal_dev_detach_vdev(uint8_t port_id, char *vdevname)
> +{
> +	char name[RTE_ETH_NAME_MAX_LEN];
> +
> +	if (vdevname == NULL)
> +		goto err;
> +
> +	/* check whether the driver supports detach feature, or not */
> +	if (rte_eth_dev_check_detachable(port_id))
> +		goto err;
> +
> +	/* get device name by port id */
> +	if (rte_eth_dev_get_name_by_port(port_id, name))
> +		goto err;
> +	/* walk around dev_driver_list to find the driver of the device,
> +	 * then invoke close function o the driver */
> +	if (rte_eal_vdev_find_and_invoke(name, RTE_EAL_INVOKE_TYPE_CLOSE))
> +		goto err;
> +	/* remove the vdevname from devargs_list */
> +	if (rte_eal_devargs_remove(RTE_DEVTYPE_VIRTUAL, name))
> +		goto err;
> +
> +	strncpy(vdevname, name, sizeof(name));
> +	return 0;
> +err:
> +	RTE_LOG(ERR, EAL, "Drver, cannot detach the device\n");
> +	return -1;
> +}
> +
> +/* attach the new device, then store port_id of the device */
> +int
> +rte_eal_dev_attach(const char *devargs, uint8_t *port_id)
> +{
> +	struct rte_pci_addr addr;
> +
> +	if ((devargs == NULL) || (port_id == NULL))
> +		return -EINVAL;
> +
> +	if (eal_parse_pci_DomBDF(devargs, &addr) == 0)
> +		return rte_eal_dev_attach_pdev(&addr, port_id);
> +	else
> +		return rte_eal_dev_attach_vdev(devargs, port_id);
> +}
> +
> +/* detach the device, then store the name of the device */
> +int
> +rte_eal_dev_detach(uint8_t port_id, char *name)
> +{
> +	struct rte_pci_addr addr;
> +	int ret;
> +
> +	if (name == NULL)
> +		return -EINVAL;
> +
> +	if (rte_eth_dev_get_device_type(port_id) == RTE_ETH_DEV_PHYSICAL) {
> +		ret = rte_eth_dev_get_addr_by_port(port_id, &addr);
> +		if (ret < 0)
> +			return ret;
> +
> +		ret = rte_eal_dev_detach_pdev(port_id, &addr);
> +		if (ret == 0)
> +			snprintf(name, RTE_ETH_NAME_MAX_LEN,
> +				"%04x:%02x:%02x.%d",
> +				addr.domain, addr.bus,
> +				addr.devid, addr.function);
> +
> +		return ret;
> +	} else
> +		return rte_eal_dev_detach_vdev(port_id, name);
> +}
> +#else /* ENABLE_HOTPLUG */
> +int
> +rte_eal_dev_attach(const char *devargs __rte_unused,
> +			uint8_t *port_id __rte_unused)
> +{
> +	RTE_LOG(ERR, EAL, "Hotplug support isn't enabled\n");
> +	return -1;
> +}
> +
> +/* detach the device, then store the name of the device */
> +int
> +rte_eal_dev_detach(uint8_t port_id __rte_unused,
> +			char *name __rte_unused)
> +{
> +	RTE_LOG(ERR, EAL, "Hotplug support isn't enabled\n");
> +	return -1;
> +}
> +#endif /* ENABLE_HOTPLUG */
> diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
> index 1a362ab..8168a7a 100644
> --- a/lib/librte_eal/common/eal_private.h
> +++ b/lib/librte_eal/common/eal_private.h
> @@ -163,6 +163,17 @@ enum rte_eal_invoke_type {
>  };
>  
>  /**
> + * Scan the content of the PCI bus, and the devices in the devices
> + * list
> + *
> + * This function is private to EAL.
> + *
> + * @return
> + *  0 on success, negative on error
> + */
> +int rte_eal_pci_scan(void);
> +
> +/**
>   * Mmap memory for single PCI device
>   *
>   * This function is private to EAL.
> diff --git a/lib/librte_eal/common/include/rte_dev.h b/lib/librte_eal/common/include/rte_dev.h
> index f7e3a10..e63dd1c 100644
> --- a/lib/librte_eal/common/include/rte_dev.h
> +++ b/lib/librte_eal/common/include/rte_dev.h
> @@ -47,6 +47,7 @@ extern "C" {
>  #endif
>  
>  #include <sys/queue.h>
> +#include <rte_pci.h>
>  
>  /** Double linked list of device drivers. */
>  TAILQ_HEAD(rte_driver_list, rte_driver);
> @@ -57,6 +58,11 @@ TAILQ_HEAD(rte_driver_list, rte_driver);
>  typedef int (rte_dev_init_t)(const char *name, const char *args);
>  
>  /**
> + * Uninitilization function called for each device driver once.
> + */
> +typedef int (rte_dev_uninit_t)(const char *name, const char *args);
> +
> +/**
>   * Driver type enumeration
>   */
>  enum pmd_type {
> @@ -72,6 +78,7 @@ struct rte_driver {
>  	enum pmd_type type;		   /**< PMD Driver type */
>  	const char *name;                   /**< Driver name. */
>  	rte_dev_init_t *init;              /**< Device init. function. */
> +	rte_dev_uninit_t *uninit;          /**< Device uninit. function. */
>  };
>  
>  /**
> @@ -93,6 +100,32 @@ void rte_eal_driver_register(struct rte_driver *driver);
>  void rte_eal_driver_unregister(struct rte_driver *driver);
>  
>  /**
> + * Attach a new device.
> + *
> + * @param devargs
> + *   A pointer to a strings array describing the new device
> + *   to be attached. The strings should be a pci address like
> + *   '0000:01:00.0' or virtual device name like 'eth_pcap0'.
> + * @param port_id
> + *  A pointer to a port identifier actually attached.
> + * @return
> + *  0 on success and port_id is filled, negative on error
> + */
> +int rte_eal_dev_attach(const char *devargs, uint8_t *port_id);
> +
> +/**
> + * Detach a device.
> + *
> + * @param port_id
> + *   The port identifier of the device to detach.
> + * @param addr
> + *  A pointer to a device name actually detached.
> + * @return
> + *  0 on success and devname is filled, negative on error
> + */
> +int rte_eal_dev_detach(uint8_t port_id, char *devname);
> +
> +/**
>   * Initalize all the registered drivers in this process
>   */
>  int rte_eal_dev_init(void);
> diff --git a/lib/librte_eal/linuxapp/eal/Makefile b/lib/librte_eal/linuxapp/eal/Makefile
> index 72ecf3a..0ec83b5 100644
> --- a/lib/librte_eal/linuxapp/eal/Makefile
> +++ b/lib/librte_eal/linuxapp/eal/Makefile
> @@ -41,6 +41,7 @@ CFLAGS += -I$(RTE_SDK)/lib/librte_eal/common/include
>  CFLAGS += -I$(RTE_SDK)/lib/librte_ring
>  CFLAGS += -I$(RTE_SDK)/lib/librte_mempool
>  CFLAGS += -I$(RTE_SDK)/lib/librte_malloc
> +CFLAGS += -I$(RTE_SDK)/lib/librte_mbuf
>  CFLAGS += -I$(RTE_SDK)/lib/librte_ether
>  CFLAGS += -I$(RTE_SDK)/lib/librte_ivshmem
>  CFLAGS += -I$(RTE_SDK)/lib/librte_pmd_ring
> diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
> index 831422e..1f43688 100644
> --- a/lib/librte_eal/linuxapp/eal/eal_pci.c
> +++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
> @@ -431,8 +431,8 @@ error:
>   * Scan the content of the PCI bus, and the devices in the devices
>   * list
>   */
> -static int
> -pci_scan(void)
> +int
> +rte_eal_pci_scan(void)
>  {
>  	struct dirent *e;
>  	DIR *dir;
> @@ -764,7 +764,7 @@ rte_eal_pci_init(void)
>  	if (internal_config.no_pci)
>  		return 0;
>  
> -	if (pci_scan() < 0) {
> +	if (rte_eal_pci_scan() < 0) {
>  		RTE_LOG(ERR, EAL, "%s(): Cannot scan PCI bus\n", __func__);
>  		return -1;
>  	}
Michael Qiu Feb. 2, 2015, 6:22 a.m. UTC | #2
On 2/2/2015 1:43 PM, Qiu, Michael wrote:
> On 2/1/2015 12:02 PM, Tetsuya Mukawa wrote:
>> These functions are used for attaching or detaching a port.
>> When rte_eal_dev_attach() is called, the function tries to realize the
>> device name as pci address. If this is done successfully,
>> rte_eal_dev_attach() will attach physical device port. If not, attaches
>> virtual devive port.
>> When rte_eal_dev_detach() is called, the function gets the device type
>> of this port to know whether the port is came from physical or virtual.
>> And then specific detaching function will be called.
>>
>> v5:
>> - Change function names like below.
>>   rte_eal_dev_find_and_invoke() to rte_eal_vdev_find_and_invoke().
>>   rte_eal_dev_invoke() to rte_eal_vdev_invoke().
>> - Add code to handle a return value of rte_eal_devargs_remove().
>> - Fix pci address format in rte_eal_dev_detach().
>> v4:
>> - Fix comment.
>> - Add error checking.
>> - Fix indent of 'if' statement.
>> - Change function name.
>>

[...]

>> +/* attach the new virtual device, then store port_id of the device */
>> +static int
>> +rte_eal_dev_attach_vdev(const char *vdevargs, uint8_t *port_id)
>> +{
>> +	char *args;
>> +	uint8_t new_port_id;
>> +	struct rte_eth_dev devs[RTE_MAX_ETHPORTS];
>> +
>> +	if ((vdevargs == NULL) || (port_id == NULL))
>> +		goto err0;
>> +
>> +	args = strdup(vdevargs);
>> +	if (args == NULL)
>> +		goto err0;
>> +
>> +	/* save current port status */
>> +	rte_eth_dev_save(devs);
>> +	/* add the vdevargs to devargs_list */
>> +	if (rte_eal_devargs_add(RTE_DEVTYPE_VIRTUAL, args))
>> +		goto err1;
>> +	/* parse vdevargs, then retrieve device name */
>> +	get_vdev_name(args);
>> +	/* walk around dev_driver_list to find the driver of the device,
>> +	 * then invoke probe function o the driver */
>> +	if (rte_eal_vdev_find_and_invoke(args, RTE_EAL_INVOKE_TYPE_PROBE))
>> +		goto err2;
>> +	/* get port_id enabled by above procedures */
>> +	if (rte_eth_dev_get_changed_port(devs, &new_port_id))
>> +		goto err2;
>> +
>> +	free(args);
>> +	*port_id = new_port_id;
>> +	return 0;
>> +err2:
>> +	rte_eal_devargs_remove(RTE_DEVTYPE_VIRTUAL, args);
>> +err1:
>> +	free(args);
>> +err0:
>> +	RTE_LOG(ERR, EAL, "Drver, cannot detach the device\n");

Here "cannot detach the device\n" should be "cannot attach the device" I
think.

> Here also "Drver",
>
>
> Thanks,
> Michael
>> +	return -1;
>> +}
>> +
>> +/* detach the new virtual device, then store the name of the device */
>> +static int
>> +rte_eal_dev_detach_vdev(uint8_t port_id, char *vdevname)
>> +{
>> +	char name[RTE_ETH_NAME_MAX_LEN];
>> +
>> +	if (vdevname == NULL)
>> +		goto err;
>> +
>> +	/* check whether the driver supports detach feature, or not */
>> +	if (rte_eth_dev_check_detachable(port_id))
>> +		goto err;
>> +
>> +	/* get device name by port id */
>> +	if (rte_eth_dev_get_name_by_port(port_id, name))
>> +		goto err;
>> +	/* walk around dev_driver_list to find the driver of the device,
>> +	 * then invoke close function o the driver */
>> +	if (rte_eal_vdev_find_and_invoke(name, RTE_EAL_INVOKE_TYPE_CLOSE))
>> +		goto err;
>> +	/* remove the vdevname from devargs_list */
>> +	if (rte_eal_devargs_remove(RTE_DEVTYPE_VIRTUAL, name))
>> +		goto err;
>> +
>> +	strncpy(vdevname, name, sizeof(name));
>> +	return 0;
>> +err:
>> +	RTE_LOG(ERR, EAL, "Drver, cannot detach the device\n");
>> +	return -1;
>> +}
>> +
>> +/* attach the new device, then store port_id of the device */
>> +int
>> +rte_eal_dev_attach(const char *devargs, uint8_t *port_id)
>> +{
>> +	struct rte_pci_addr addr;
>> +
>> +	if ((devargs == NULL) || (port_id == NULL))
>> +		return -EINVAL;
>> +
>> +	if (eal_parse_pci_DomBDF(devargs, &addr) == 0)
>> +		return rte_eal_dev_attach_pdev(&addr, port_id);
>> +	else
>> +		return rte_eal_dev_attach_vdev(devargs, port_id);
>> +}
>> +
>> +/* detach the device, then store the name of the device */
>> +int
>> +rte_eal_dev_detach(uint8_t port_id, char *name)
>> +{
>> +	struct rte_pci_addr addr;
>> +	int ret;
>> +
>> +	if (name == NULL)
>> +		return -EINVAL;
>> +
>> +	if (rte_eth_dev_get_device_type(port_id) == RTE_ETH_DEV_PHYSICAL) {
>> +		ret = rte_eth_dev_get_addr_by_port(port_id, &addr);
>> +		if (ret < 0)
>> +			return ret;
>> +
>> +		ret = rte_eal_dev_detach_pdev(port_id, &addr);
>> +		if (ret == 0)
>> +			snprintf(name, RTE_ETH_NAME_MAX_LEN,
>> +				"%04x:%02x:%02x.%d",
>> +				addr.domain, addr.bus,
>> +				addr.devid, addr.function);
>> +
>> +		return ret;
>> +	} else
>> +		return rte_eal_dev_detach_vdev(port_id, name);
>> +}
>> +#else /* ENABLE_HOTPLUG */
>> +int
>> +rte_eal_dev_attach(const char *devargs __rte_unused,
>> +			uint8_t *port_id __rte_unused)
>> +{
>> +	RTE_LOG(ERR, EAL, "Hotplug support isn't enabled\n");
>> +	return -1;
>> +}
>> +
>> +/* detach the device, then store the name of the device */
>> +int
>> +rte_eal_dev_detach(uint8_t port_id __rte_unused,
>> +			char *name __rte_unused)
>> +{
>> +	RTE_LOG(ERR, EAL, "Hotplug support isn't enabled\n");
>> +	return -1;
>> +}
>> +#endif /* ENABLE_HOTPLUG */
>> diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
>> index 1a362ab..8168a7a 100644
>> --- a/lib/librte_eal/common/eal_private.h
>> +++ b/lib/librte_eal/common/eal_private.h
>> @@ -163,6 +163,17 @@ enum rte_eal_invoke_type {
>>  };
>>  
>>  /**
>> + * Scan the content of the PCI bus, and the devices in the devices
>> + * list
>> + *
>> + * This function is private to EAL.
>> + *
>> + * @return
>> + *  0 on success, negative on error
>> + */
>> +int rte_eal_pci_scan(void);
>> +
>> +/**
>>   * Mmap memory for single PCI device
>>   *
>>   * This function is private to EAL.
>> diff --git a/lib/librte_eal/common/include/rte_dev.h b/lib/librte_eal/common/include/rte_dev.h
>> index f7e3a10..e63dd1c 100644
>> --- a/lib/librte_eal/common/include/rte_dev.h
>> +++ b/lib/librte_eal/common/include/rte_dev.h
>> @@ -47,6 +47,7 @@ extern "C" {
>>  #endif
>>  
>>  #include <sys/queue.h>
>> +#include <rte_pci.h>
>>  
>>  /** Double linked list of device drivers. */
>>  TAILQ_HEAD(rte_driver_list, rte_driver);
>> @@ -57,6 +58,11 @@ TAILQ_HEAD(rte_driver_list, rte_driver);
>>  typedef int (rte_dev_init_t)(const char *name, const char *args);
>>  
>>  /**
>> + * Uninitilization function called for each device driver once.
>> + */
>> +typedef int (rte_dev_uninit_t)(const char *name, const char *args);
>> +
>> +/**
>>   * Driver type enumeration
>>   */
>>  enum pmd_type {
>> @@ -72,6 +78,7 @@ struct rte_driver {
>>  	enum pmd_type type;		   /**< PMD Driver type */
>>  	const char *name;                   /**< Driver name. */
>>  	rte_dev_init_t *init;              /**< Device init. function. */
>> +	rte_dev_uninit_t *uninit;          /**< Device uninit. function. */
>>  };
>>  
>>  /**
>> @@ -93,6 +100,32 @@ void rte_eal_driver_register(struct rte_driver *driver);
>>  void rte_eal_driver_unregister(struct rte_driver *driver);
>>  
>>  /**
>> + * Attach a new device.
>> + *
>> + * @param devargs
>> + *   A pointer to a strings array describing the new device
>> + *   to be attached. The strings should be a pci address like
>> + *   '0000:01:00.0' or virtual device name like 'eth_pcap0'.
>> + * @param port_id
>> + *  A pointer to a port identifier actually attached.
>> + * @return
>> + *  0 on success and port_id is filled, negative on error
>> + */
>> +int rte_eal_dev_attach(const char *devargs, uint8_t *port_id);
>> +
>> +/**
>> + * Detach a device.
>> + *
>> + * @param port_id
>> + *   The port identifier of the device to detach.
>> + * @param addr
>> + *  A pointer to a device name actually detached.
>> + * @return
>> + *  0 on success and devname is filled, negative on error
>> + */
>> +int rte_eal_dev_detach(uint8_t port_id, char *devname);
>> +
>> +/**
>>   * Initalize all the registered drivers in this process
>>   */
>>  int rte_eal_dev_init(void);
>> diff --git a/lib/librte_eal/linuxapp/eal/Makefile b/lib/librte_eal/linuxapp/eal/Makefile
>> index 72ecf3a..0ec83b5 100644
>> --- a/lib/librte_eal/linuxapp/eal/Makefile
>> +++ b/lib/librte_eal/linuxapp/eal/Makefile
>> @@ -41,6 +41,7 @@ CFLAGS += -I$(RTE_SDK)/lib/librte_eal/common/include
>>  CFLAGS += -I$(RTE_SDK)/lib/librte_ring
>>  CFLAGS += -I$(RTE_SDK)/lib/librte_mempool
>>  CFLAGS += -I$(RTE_SDK)/lib/librte_malloc
>> +CFLAGS += -I$(RTE_SDK)/lib/librte_mbuf
>>  CFLAGS += -I$(RTE_SDK)/lib/librte_ether
>>  CFLAGS += -I$(RTE_SDK)/lib/librte_ivshmem
>>  CFLAGS += -I$(RTE_SDK)/lib/librte_pmd_ring
>> diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
>> index 831422e..1f43688 100644
>> --- a/lib/librte_eal/linuxapp/eal/eal_pci.c
>> +++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
>> @@ -431,8 +431,8 @@ error:
>>   * Scan the content of the PCI bus, and the devices in the devices
>>   * list
>>   */
>> -static int
>> -pci_scan(void)
>> +int
>> +rte_eal_pci_scan(void)
>>  {
>>  	struct dirent *e;
>>  	DIR *dir;
>> @@ -764,7 +764,7 @@ rte_eal_pci_init(void)
>>  	if (internal_config.no_pci)
>>  		return 0;
>>  
>> -	if (pci_scan() < 0) {
>> +	if (rte_eal_pci_scan() < 0) {
>>  		RTE_LOG(ERR, EAL, "%s(): Cannot scan PCI bus\n", __func__);
>>  		return -1;
>>  	}
>
Tetsuya Mukawa Feb. 3, 2015, 1:28 a.m. UTC | #3
On 2015/02/02 15:22, Qiu, Michael wrote:
> On 2/2/2015 1:43 PM, Qiu, Michael wrote:
>> On 2/1/2015 12:02 PM, Tetsuya Mukawa wrote:
>>> These functions are used for attaching or detaching a port.
>>> When rte_eal_dev_attach() is called, the function tries to realize the
>>> device name as pci address. If this is done successfully,
>>> rte_eal_dev_attach() will attach physical device port. If not, attaches
>>> virtual devive port.
>>> When rte_eal_dev_detach() is called, the function gets the device type
>>> of this port to know whether the port is came from physical or virtual.
>>> And then specific detaching function will be called.
>>>
>>> v5:
>>> - Change function names like below.
>>>   rte_eal_dev_find_and_invoke() to rte_eal_vdev_find_and_invoke().
>>>   rte_eal_dev_invoke() to rte_eal_vdev_invoke().
>>> - Add code to handle a return value of rte_eal_devargs_remove().
>>> - Fix pci address format in rte_eal_dev_detach().
>>> v4:
>>> - Fix comment.
>>> - Add error checking.
>>> - Fix indent of 'if' statement.
>>> - Change function name.
>>>
> [...]
>
>>> +/* attach the new virtual device, then store port_id of the device */
>>> +static int
>>> +rte_eal_dev_attach_vdev(const char *vdevargs, uint8_t *port_id)
>>> +{
>>> +	char *args;
>>> +	uint8_t new_port_id;
>>> +	struct rte_eth_dev devs[RTE_MAX_ETHPORTS];
>>> +
>>> +	if ((vdevargs == NULL) || (port_id == NULL))
>>> +		goto err0;
>>> +
>>> +	args = strdup(vdevargs);
>>> +	if (args == NULL)
>>> +		goto err0;
>>> +
>>> +	/* save current port status */
>>> +	rte_eth_dev_save(devs);
>>> +	/* add the vdevargs to devargs_list */
>>> +	if (rte_eal_devargs_add(RTE_DEVTYPE_VIRTUAL, args))
>>> +		goto err1;
>>> +	/* parse vdevargs, then retrieve device name */
>>> +	get_vdev_name(args);
>>> +	/* walk around dev_driver_list to find the driver of the device,
>>> +	 * then invoke probe function o the driver */
>>> +	if (rte_eal_vdev_find_and_invoke(args, RTE_EAL_INVOKE_TYPE_PROBE))
>>> +		goto err2;
>>> +	/* get port_id enabled by above procedures */
>>> +	if (rte_eth_dev_get_changed_port(devs, &new_port_id))
>>> +		goto err2;
>>> +
>>> +	free(args);
>>> +	*port_id = new_port_id;
>>> +	return 0;
>>> +err2:
>>> +	rte_eal_devargs_remove(RTE_DEVTYPE_VIRTUAL, args);
>>> +err1:
>>> +	free(args);
>>> +err0:
>>> +	RTE_LOG(ERR, EAL, "Drver, cannot detach the device\n");
> Here "cannot detach the device\n" should be "cannot attach the device" I
> think.

Hi Michael,

Thanks, I will fix above error message.
Also I will fix my "Drver" typos.

Tetsuya

>> Here also "Drver",
>>
>>
>> Thanks,
>> Michael
>>> +	return -1;
>>> +}
>>> +
>>> +/* detach the new virtual device, then store the name of the device */
>>> +static int
>>> +rte_eal_dev_detach_vdev(uint8_t port_id, char *vdevname)
>>> +{
>>> +	char name[RTE_ETH_NAME_MAX_LEN];
>>> +
>>> +	if (vdevname == NULL)
>>> +		goto err;
>>> +
>>> +	/* check whether the driver supports detach feature, or not */
>>> +	if (rte_eth_dev_check_detachable(port_id))
>>> +		goto err;
>>> +
>>> +	/* get device name by port id */
>>> +	if (rte_eth_dev_get_name_by_port(port_id, name))
>>> +		goto err;
>>> +	/* walk around dev_driver_list to find the driver of the device,
>>> +	 * then invoke close function o the driver */
>>> +	if (rte_eal_vdev_find_and_invoke(name, RTE_EAL_INVOKE_TYPE_CLOSE))
>>> +		goto err;
>>> +	/* remove the vdevname from devargs_list */
>>> +	if (rte_eal_devargs_remove(RTE_DEVTYPE_VIRTUAL, name))
>>> +		goto err;
>>> +
>>> +	strncpy(vdevname, name, sizeof(name));
>>> +	return 0;
>>> +err:
>>> +	RTE_LOG(ERR, EAL, "Drver, cannot detach the device\n");
>>> +	return -1;
>>> +}
>>> +
>>> +/* attach the new device, then store port_id of the device */
>>> +int
>>> +rte_eal_dev_attach(const char *devargs, uint8_t *port_id)
>>> +{
>>> +	struct rte_pci_addr addr;
>>> +
>>> +	if ((devargs == NULL) || (port_id == NULL))
>>> +		return -EINVAL;
>>> +
>>> +	if (eal_parse_pci_DomBDF(devargs, &addr) == 0)
>>> +		return rte_eal_dev_attach_pdev(&addr, port_id);
>>> +	else
>>> +		return rte_eal_dev_attach_vdev(devargs, port_id);
>>> +}
>>> +
>>> +/* detach the device, then store the name of the device */
>>> +int
>>> +rte_eal_dev_detach(uint8_t port_id, char *name)
>>> +{
>>> +	struct rte_pci_addr addr;
>>> +	int ret;
>>> +
>>> +	if (name == NULL)
>>> +		return -EINVAL;
>>> +
>>> +	if (rte_eth_dev_get_device_type(port_id) == RTE_ETH_DEV_PHYSICAL) {
>>> +		ret = rte_eth_dev_get_addr_by_port(port_id, &addr);
>>> +		if (ret < 0)
>>> +			return ret;
>>> +
>>> +		ret = rte_eal_dev_detach_pdev(port_id, &addr);
>>> +		if (ret == 0)
>>> +			snprintf(name, RTE_ETH_NAME_MAX_LEN,
>>> +				"%04x:%02x:%02x.%d",
>>> +				addr.domain, addr.bus,
>>> +				addr.devid, addr.function);
>>> +
>>> +		return ret;
>>> +	} else
>>> +		return rte_eal_dev_detach_vdev(port_id, name);
>>> +}
>>> +#else /* ENABLE_HOTPLUG */
>>> +int
>>> +rte_eal_dev_attach(const char *devargs __rte_unused,
>>> +			uint8_t *port_id __rte_unused)
>>> +{
>>> +	RTE_LOG(ERR, EAL, "Hotplug support isn't enabled\n");
>>> +	return -1;
>>> +}
>>> +
>>> +/* detach the device, then store the name of the device */
>>> +int
>>> +rte_eal_dev_detach(uint8_t port_id __rte_unused,
>>> +			char *name __rte_unused)
>>> +{
>>> +	RTE_LOG(ERR, EAL, "Hotplug support isn't enabled\n");
>>> +	return -1;
>>> +}
>>> +#endif /* ENABLE_HOTPLUG */
>>> diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
>>> index 1a362ab..8168a7a 100644
>>> --- a/lib/librte_eal/common/eal_private.h
>>> +++ b/lib/librte_eal/common/eal_private.h
>>> @@ -163,6 +163,17 @@ enum rte_eal_invoke_type {
>>>  };
>>>  
>>>  /**
>>> + * Scan the content of the PCI bus, and the devices in the devices
>>> + * list
>>> + *
>>> + * This function is private to EAL.
>>> + *
>>> + * @return
>>> + *  0 on success, negative on error
>>> + */
>>> +int rte_eal_pci_scan(void);
>>> +
>>> +/**
>>>   * Mmap memory for single PCI device
>>>   *
>>>   * This function is private to EAL.
>>> diff --git a/lib/librte_eal/common/include/rte_dev.h b/lib/librte_eal/common/include/rte_dev.h
>>> index f7e3a10..e63dd1c 100644
>>> --- a/lib/librte_eal/common/include/rte_dev.h
>>> +++ b/lib/librte_eal/common/include/rte_dev.h
>>> @@ -47,6 +47,7 @@ extern "C" {
>>>  #endif
>>>  
>>>  #include <sys/queue.h>
>>> +#include <rte_pci.h>
>>>  
>>>  /** Double linked list of device drivers. */
>>>  TAILQ_HEAD(rte_driver_list, rte_driver);
>>> @@ -57,6 +58,11 @@ TAILQ_HEAD(rte_driver_list, rte_driver);
>>>  typedef int (rte_dev_init_t)(const char *name, const char *args);
>>>  
>>>  /**
>>> + * Uninitilization function called for each device driver once.
>>> + */
>>> +typedef int (rte_dev_uninit_t)(const char *name, const char *args);
>>> +
>>> +/**
>>>   * Driver type enumeration
>>>   */
>>>  enum pmd_type {
>>> @@ -72,6 +78,7 @@ struct rte_driver {
>>>  	enum pmd_type type;		   /**< PMD Driver type */
>>>  	const char *name;                   /**< Driver name. */
>>>  	rte_dev_init_t *init;              /**< Device init. function. */
>>> +	rte_dev_uninit_t *uninit;          /**< Device uninit. function. */
>>>  };
>>>  
>>>  /**
>>> @@ -93,6 +100,32 @@ void rte_eal_driver_register(struct rte_driver *driver);
>>>  void rte_eal_driver_unregister(struct rte_driver *driver);
>>>  
>>>  /**
>>> + * Attach a new device.
>>> + *
>>> + * @param devargs
>>> + *   A pointer to a strings array describing the new device
>>> + *   to be attached. The strings should be a pci address like
>>> + *   '0000:01:00.0' or virtual device name like 'eth_pcap0'.
>>> + * @param port_id
>>> + *  A pointer to a port identifier actually attached.
>>> + * @return
>>> + *  0 on success and port_id is filled, negative on error
>>> + */
>>> +int rte_eal_dev_attach(const char *devargs, uint8_t *port_id);
>>> +
>>> +/**
>>> + * Detach a device.
>>> + *
>>> + * @param port_id
>>> + *   The port identifier of the device to detach.
>>> + * @param addr
>>> + *  A pointer to a device name actually detached.
>>> + * @return
>>> + *  0 on success and devname is filled, negative on error
>>> + */
>>> +int rte_eal_dev_detach(uint8_t port_id, char *devname);
>>> +
>>> +/**
>>>   * Initalize all the registered drivers in this process
>>>   */
>>>  int rte_eal_dev_init(void);
>>> diff --git a/lib/librte_eal/linuxapp/eal/Makefile b/lib/librte_eal/linuxapp/eal/Makefile
>>> index 72ecf3a..0ec83b5 100644
>>> --- a/lib/librte_eal/linuxapp/eal/Makefile
>>> +++ b/lib/librte_eal/linuxapp/eal/Makefile
>>> @@ -41,6 +41,7 @@ CFLAGS += -I$(RTE_SDK)/lib/librte_eal/common/include
>>>  CFLAGS += -I$(RTE_SDK)/lib/librte_ring
>>>  CFLAGS += -I$(RTE_SDK)/lib/librte_mempool
>>>  CFLAGS += -I$(RTE_SDK)/lib/librte_malloc
>>> +CFLAGS += -I$(RTE_SDK)/lib/librte_mbuf
>>>  CFLAGS += -I$(RTE_SDK)/lib/librte_ether
>>>  CFLAGS += -I$(RTE_SDK)/lib/librte_ivshmem
>>>  CFLAGS += -I$(RTE_SDK)/lib/librte_pmd_ring
>>> diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
>>> index 831422e..1f43688 100644
>>> --- a/lib/librte_eal/linuxapp/eal/eal_pci.c
>>> +++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
>>> @@ -431,8 +431,8 @@ error:
>>>   * Scan the content of the PCI bus, and the devices in the devices
>>>   * list
>>>   */
>>> -static int
>>> -pci_scan(void)
>>> +int
>>> +rte_eal_pci_scan(void)
>>>  {
>>>  	struct dirent *e;
>>>  	DIR *dir;
>>> @@ -764,7 +764,7 @@ rte_eal_pci_init(void)
>>>  	if (internal_config.no_pci)
>>>  		return 0;
>>>  
>>> -	if (pci_scan() < 0) {
>>> +	if (rte_eal_pci_scan() < 0) {
>>>  		RTE_LOG(ERR, EAL, "%s(): Cannot scan PCI bus\n", __func__);
>>>  		return -1;
>>>  	}
diff mbox

Patch

diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c
index eae5656..e3a3f54 100644
--- a/lib/librte_eal/common/eal_common_dev.c
+++ b/lib/librte_eal/common/eal_common_dev.c
@@ -32,10 +32,13 @@ 
  *   OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
+#include <stdio.h>
+#include <limits.h>
 #include <string.h>
 #include <inttypes.h>
 #include <sys/queue.h>
 
+#include <rte_ethdev.h>
 #include <rte_dev.h>
 #include <rte_devargs.h>
 #include <rte_debug.h>
@@ -107,3 +110,274 @@  rte_eal_dev_init(void)
 	}
 	return 0;
 }
+
+/* So far, DPDK hotplug function only supports linux */
+#ifdef ENABLE_HOTPLUG
+static void
+rte_eal_vdev_invoke(struct rte_driver *driver,
+		struct rte_devargs *devargs, enum rte_eal_invoke_type type)
+{
+	if ((driver == NULL) || (devargs == NULL))
+		return;
+
+	switch (type) {
+	case RTE_EAL_INVOKE_TYPE_PROBE:
+		driver->init(devargs->virtual.drv_name, devargs->args);
+		break;
+	case RTE_EAL_INVOKE_TYPE_CLOSE:
+		driver->uninit(devargs->virtual.drv_name, devargs->args);
+		break;
+	default:
+		break;
+	}
+}
+
+static int
+rte_eal_vdev_find_and_invoke(const char *name, int type)
+{
+	struct rte_devargs *devargs;
+	struct rte_driver *driver;
+
+	if (name == NULL)
+		return -EINVAL;
+
+	/* call the init function for each virtual device */
+	TAILQ_FOREACH(devargs, &devargs_list, next) {
+
+		if (devargs->type != RTE_DEVTYPE_VIRTUAL)
+			continue;
+
+		if (strncmp(name, devargs->virtual.drv_name, strlen(name)))
+			continue;
+
+		TAILQ_FOREACH(driver, &dev_driver_list, next) {
+			if (driver->type != PMD_VDEV)
+				continue;
+
+			/* search a driver prefix in virtual device name */
+			if (!strncmp(driver->name, devargs->virtual.drv_name,
+			    strlen(driver->name))) {
+				rte_eal_vdev_invoke(driver, devargs, type);
+				break;
+			}
+		}
+
+		if (driver == NULL) {
+			RTE_LOG(WARNING, EAL, "no driver found for %s\n",
+				  devargs->virtual.drv_name);
+		}
+		return 0;
+	}
+	return 1;
+}
+
+/* attach the new physical device, then store port_id of the device */
+static int
+rte_eal_dev_attach_pdev(struct rte_pci_addr *addr, uint8_t *port_id)
+{
+	uint8_t new_port_id;
+	struct rte_eth_dev devs[RTE_MAX_ETHPORTS];
+
+	if ((addr == NULL) || (port_id == NULL))
+		goto err;
+
+	/* save current port status */
+	rte_eth_dev_save(devs);
+	/* re-construct pci_device_list */
+	if (rte_eal_pci_scan())
+		goto err;
+	/* invoke probe func of the driver can handle the new device */
+	if (rte_eal_pci_probe_one(addr))
+		goto err;
+	/* get port_id enabled by above procedures */
+	if (rte_eth_dev_get_changed_port(devs, &new_port_id))
+		goto err;
+
+	*port_id = new_port_id;
+	return 0;
+err:
+	RTE_LOG(ERR, EAL, "Drver, cannot attach the device\n");
+	return -1;
+}
+
+/* detach the new physical device, then store pci_addr of the device */
+static int
+rte_eal_dev_detach_pdev(uint8_t port_id, struct rte_pci_addr *addr)
+{
+	struct rte_pci_addr freed_addr;
+	struct rte_pci_addr vp;
+
+	if (addr == NULL)
+		goto err;
+
+	/* check whether the driver supports detach feature, or not */
+	if (rte_eth_dev_check_detachable(port_id))
+		goto err;
+
+	/* get pci address by port id */
+	if (rte_eth_dev_get_addr_by_port(port_id, &freed_addr))
+		goto err;
+
+	/* Zerod pci addr means the port comes from virtual device */
+	vp.domain = vp.bus = vp.devid = vp.function = 0;
+	if (eal_compare_pci_addr(&vp, &freed_addr) == 0)
+		goto err;
+
+	/* invoke close func of the driver,
+	 * also remove the device from pci_device_list */
+	if (rte_eal_pci_close_one(&freed_addr))
+		goto err;
+
+	*addr = freed_addr;
+	return 0;
+err:
+	RTE_LOG(ERR, EAL, "Drver, cannot detach the device\n");
+	return -1;
+}
+
+static void
+get_vdev_name(char *vdevargs)
+{
+	char *sep;
+
+	if (vdevargs == NULL)
+		return;
+
+	/* set the first ',' to '\0' to split name and arguments */
+	sep = strchr(vdevargs, ',');
+	if (sep != NULL)
+		sep[0] = '\0';
+}
+
+/* attach the new virtual device, then store port_id of the device */
+static int
+rte_eal_dev_attach_vdev(const char *vdevargs, uint8_t *port_id)
+{
+	char *args;
+	uint8_t new_port_id;
+	struct rte_eth_dev devs[RTE_MAX_ETHPORTS];
+
+	if ((vdevargs == NULL) || (port_id == NULL))
+		goto err0;
+
+	args = strdup(vdevargs);
+	if (args == NULL)
+		goto err0;
+
+	/* save current port status */
+	rte_eth_dev_save(devs);
+	/* add the vdevargs to devargs_list */
+	if (rte_eal_devargs_add(RTE_DEVTYPE_VIRTUAL, args))
+		goto err1;
+	/* parse vdevargs, then retrieve device name */
+	get_vdev_name(args);
+	/* walk around dev_driver_list to find the driver of the device,
+	 * then invoke probe function o the driver */
+	if (rte_eal_vdev_find_and_invoke(args, RTE_EAL_INVOKE_TYPE_PROBE))
+		goto err2;
+	/* get port_id enabled by above procedures */
+	if (rte_eth_dev_get_changed_port(devs, &new_port_id))
+		goto err2;
+
+	free(args);
+	*port_id = new_port_id;
+	return 0;
+err2:
+	rte_eal_devargs_remove(RTE_DEVTYPE_VIRTUAL, args);
+err1:
+	free(args);
+err0:
+	RTE_LOG(ERR, EAL, "Drver, cannot detach the device\n");
+	return -1;
+}
+
+/* detach the new virtual device, then store the name of the device */
+static int
+rte_eal_dev_detach_vdev(uint8_t port_id, char *vdevname)
+{
+	char name[RTE_ETH_NAME_MAX_LEN];
+
+	if (vdevname == NULL)
+		goto err;
+
+	/* check whether the driver supports detach feature, or not */
+	if (rte_eth_dev_check_detachable(port_id))
+		goto err;
+
+	/* get device name by port id */
+	if (rte_eth_dev_get_name_by_port(port_id, name))
+		goto err;
+	/* walk around dev_driver_list to find the driver of the device,
+	 * then invoke close function o the driver */
+	if (rte_eal_vdev_find_and_invoke(name, RTE_EAL_INVOKE_TYPE_CLOSE))
+		goto err;
+	/* remove the vdevname from devargs_list */
+	if (rte_eal_devargs_remove(RTE_DEVTYPE_VIRTUAL, name))
+		goto err;
+
+	strncpy(vdevname, name, sizeof(name));
+	return 0;
+err:
+	RTE_LOG(ERR, EAL, "Drver, cannot detach the device\n");
+	return -1;
+}
+
+/* attach the new device, then store port_id of the device */
+int
+rte_eal_dev_attach(const char *devargs, uint8_t *port_id)
+{
+	struct rte_pci_addr addr;
+
+	if ((devargs == NULL) || (port_id == NULL))
+		return -EINVAL;
+
+	if (eal_parse_pci_DomBDF(devargs, &addr) == 0)
+		return rte_eal_dev_attach_pdev(&addr, port_id);
+	else
+		return rte_eal_dev_attach_vdev(devargs, port_id);
+}
+
+/* detach the device, then store the name of the device */
+int
+rte_eal_dev_detach(uint8_t port_id, char *name)
+{
+	struct rte_pci_addr addr;
+	int ret;
+
+	if (name == NULL)
+		return -EINVAL;
+
+	if (rte_eth_dev_get_device_type(port_id) == RTE_ETH_DEV_PHYSICAL) {
+		ret = rte_eth_dev_get_addr_by_port(port_id, &addr);
+		if (ret < 0)
+			return ret;
+
+		ret = rte_eal_dev_detach_pdev(port_id, &addr);
+		if (ret == 0)
+			snprintf(name, RTE_ETH_NAME_MAX_LEN,
+				"%04x:%02x:%02x.%d",
+				addr.domain, addr.bus,
+				addr.devid, addr.function);
+
+		return ret;
+	} else
+		return rte_eal_dev_detach_vdev(port_id, name);
+}
+#else /* ENABLE_HOTPLUG */
+int
+rte_eal_dev_attach(const char *devargs __rte_unused,
+			uint8_t *port_id __rte_unused)
+{
+	RTE_LOG(ERR, EAL, "Hotplug support isn't enabled\n");
+	return -1;
+}
+
+/* detach the device, then store the name of the device */
+int
+rte_eal_dev_detach(uint8_t port_id __rte_unused,
+			char *name __rte_unused)
+{
+	RTE_LOG(ERR, EAL, "Hotplug support isn't enabled\n");
+	return -1;
+}
+#endif /* ENABLE_HOTPLUG */
diff --git a/lib/librte_eal/common/eal_private.h b/lib/librte_eal/common/eal_private.h
index 1a362ab..8168a7a 100644
--- a/lib/librte_eal/common/eal_private.h
+++ b/lib/librte_eal/common/eal_private.h
@@ -163,6 +163,17 @@  enum rte_eal_invoke_type {
 };
 
 /**
+ * Scan the content of the PCI bus, and the devices in the devices
+ * list
+ *
+ * This function is private to EAL.
+ *
+ * @return
+ *  0 on success, negative on error
+ */
+int rte_eal_pci_scan(void);
+
+/**
  * Mmap memory for single PCI device
  *
  * This function is private to EAL.
diff --git a/lib/librte_eal/common/include/rte_dev.h b/lib/librte_eal/common/include/rte_dev.h
index f7e3a10..e63dd1c 100644
--- a/lib/librte_eal/common/include/rte_dev.h
+++ b/lib/librte_eal/common/include/rte_dev.h
@@ -47,6 +47,7 @@  extern "C" {
 #endif
 
 #include <sys/queue.h>
+#include <rte_pci.h>
 
 /** Double linked list of device drivers. */
 TAILQ_HEAD(rte_driver_list, rte_driver);
@@ -57,6 +58,11 @@  TAILQ_HEAD(rte_driver_list, rte_driver);
 typedef int (rte_dev_init_t)(const char *name, const char *args);
 
 /**
+ * Uninitilization function called for each device driver once.
+ */
+typedef int (rte_dev_uninit_t)(const char *name, const char *args);
+
+/**
  * Driver type enumeration
  */
 enum pmd_type {
@@ -72,6 +78,7 @@  struct rte_driver {
 	enum pmd_type type;		   /**< PMD Driver type */
 	const char *name;                   /**< Driver name. */
 	rte_dev_init_t *init;              /**< Device init. function. */
+	rte_dev_uninit_t *uninit;          /**< Device uninit. function. */
 };
 
 /**
@@ -93,6 +100,32 @@  void rte_eal_driver_register(struct rte_driver *driver);
 void rte_eal_driver_unregister(struct rte_driver *driver);
 
 /**
+ * Attach a new device.
+ *
+ * @param devargs
+ *   A pointer to a strings array describing the new device
+ *   to be attached. The strings should be a pci address like
+ *   '0000:01:00.0' or virtual device name like 'eth_pcap0'.
+ * @param port_id
+ *  A pointer to a port identifier actually attached.
+ * @return
+ *  0 on success and port_id is filled, negative on error
+ */
+int rte_eal_dev_attach(const char *devargs, uint8_t *port_id);
+
+/**
+ * Detach a device.
+ *
+ * @param port_id
+ *   The port identifier of the device to detach.
+ * @param addr
+ *  A pointer to a device name actually detached.
+ * @return
+ *  0 on success and devname is filled, negative on error
+ */
+int rte_eal_dev_detach(uint8_t port_id, char *devname);
+
+/**
  * Initalize all the registered drivers in this process
  */
 int rte_eal_dev_init(void);
diff --git a/lib/librte_eal/linuxapp/eal/Makefile b/lib/librte_eal/linuxapp/eal/Makefile
index 72ecf3a..0ec83b5 100644
--- a/lib/librte_eal/linuxapp/eal/Makefile
+++ b/lib/librte_eal/linuxapp/eal/Makefile
@@ -41,6 +41,7 @@  CFLAGS += -I$(RTE_SDK)/lib/librte_eal/common/include
 CFLAGS += -I$(RTE_SDK)/lib/librte_ring
 CFLAGS += -I$(RTE_SDK)/lib/librte_mempool
 CFLAGS += -I$(RTE_SDK)/lib/librte_malloc
+CFLAGS += -I$(RTE_SDK)/lib/librte_mbuf
 CFLAGS += -I$(RTE_SDK)/lib/librte_ether
 CFLAGS += -I$(RTE_SDK)/lib/librte_ivshmem
 CFLAGS += -I$(RTE_SDK)/lib/librte_pmd_ring
diff --git a/lib/librte_eal/linuxapp/eal/eal_pci.c b/lib/librte_eal/linuxapp/eal/eal_pci.c
index 831422e..1f43688 100644
--- a/lib/librte_eal/linuxapp/eal/eal_pci.c
+++ b/lib/librte_eal/linuxapp/eal/eal_pci.c
@@ -431,8 +431,8 @@  error:
  * Scan the content of the PCI bus, and the devices in the devices
  * list
  */
-static int
-pci_scan(void)
+int
+rte_eal_pci_scan(void)
 {
 	struct dirent *e;
 	DIR *dir;
@@ -764,7 +764,7 @@  rte_eal_pci_init(void)
 	if (internal_config.no_pci)
 		return 0;
 
-	if (pci_scan() < 0) {
+	if (rte_eal_pci_scan() < 0) {
 		RTE_LOG(ERR, EAL, "%s(): Cannot scan PCI bus\n", __func__);
 		return -1;
 	}