Re: [dpdk-dev] [PATCH v11 08/13] ethdev: Add functions that will be used by port hotplug functions

["Iremonger, Bernard" <bernard.iremonger@intel.com>]

> -----Original Message-----
> From: Tetsuya Mukawa [mailto:mukawa@igel.co.jp]
> Sent: Monday, February 23, 2015 5:09 AM
> To: dev@dpdk.org
> Cc: Qiu, Michael; Iremonger, Bernard; maxime.leroy@6wind.com; Tetsuya Mukawa
> Subject: [PATCH v11 08/13] ethdev: Add functions that will be used by port hotplug functions
> 
> The patch adds following functions.
> 
> - rte_eth_dev_save()
>   The function is used for saving current rte_eth_dev structures.
> - rte_eth_dev_get_changed_port()
>   The function receives the rte_eth_dev structures, then compare
>   these with current values to know which port is actually
>   attached or detached.
> - rte_eth_dev_get_addr_by_port()
>   The function returns a pci address of an ethdev specified by port
>   identifier.
> - rte_eth_dev_get_port_by_addr()
>   The function returns a port identifier of an ethdev specified by
>   pci address.
> - rte_eth_dev_get_name_by_port()
>   The function returns a unique identifier name of an ethdev
>   specified by port identifier.
> - Add rte_eth_dev_is_detachable()
>   The function returns whether a PMD supports detach function.
> 
> Also, the patch changes scope of rte_eth_dev_allocated() to global.
> This function will be called by virtual PMDs to support port hotplug.
> So change scope of the function to global.
> 
> v10:
> - Change order of version.map.
>   (Thanks to Thomas Monjalon)
> v9:
> - rte_eth_dev_check_detachable() is replaced by
>   rte_eth_dev_is_detachable().
> - strncpy() is replaced by strcpy().
>   (Thanks to Thomas Monjalon)
> - Add missing symbol in version map.
>   (Thanks to Nail Horman)
> v8:
> - Add size parameter to rte_eth_dev_save().
> - Add missing symbol in version map.
>   (Thanks to Qiu, Michael and Iremonger, Bernard)
> v7:
> - Add pt_driver checking to rte_eth_dev_check_detachable().
>   (Thanks to Qiu, Michael)
> v5:
> - Fix return value of below functions.
>   rte_eth_dev_get_changed_port().
>   rte_eth_dev_get_port_by_addr().
> v4:
> - Add parameter checking.
> v3:
> - Fix if-condition bug while comparing pci addresses.
> - Add error checking codes.
> Reported-by: Mark Enright <menrigh@brocade.com>
> 
> Signed-off-by: Tetsuya Mukawa <mukawa@igel.co.jp>
> ---
>  lib/librte_ether/rte_ethdev.c          | 103 ++++++++++++++++++++++++++++++++-
>  lib/librte_ether/rte_ethdev.h          |  83 ++++++++++++++++++++++++++
>  lib/librte_ether/rte_ether_version.map |   7 +++
>  3 files changed, 192 insertions(+), 1 deletion(-)
> 
> diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c index 3d148e2..7067620
> 100644
> --- a/lib/librte_ether/rte_ethdev.c
> +++ b/lib/librte_ether/rte_ethdev.c
> @@ -201,7 +201,7 @@ rte_eth_dev_data_alloc(void)
>  				RTE_MAX_ETHPORTS * sizeof(*rte_eth_dev_data));  }
> 
> -static struct rte_eth_dev *
> +struct rte_eth_dev *
>  rte_eth_dev_allocated(const char *name)  {
>  	unsigned i;
> @@ -426,6 +426,107 @@ rte_eth_dev_count(void)
>  	return (nb_ports);
>  }
> 
> +int
> +rte_eth_dev_save(struct rte_eth_dev *devs, size_t size) {
> +	if ((devs == NULL) ||
> +	    (size != sizeof(struct rte_eth_dev) * RTE_MAX_ETHPORTS))
> +		return -EINVAL;
> +
> +	/* save current rte_eth_devices */
> +	memcpy(devs, rte_eth_devices, size);
> +	return 0;
> +}
> +
> +int
> +rte_eth_dev_get_changed_port(struct rte_eth_dev *devs, uint8_t
> +*port_id) {
> +	if ((devs == NULL) || (port_id == NULL))
> +		return -EINVAL;
> +
> +	/* check which port was attached or detached */
> +	for (*port_id = 0; *port_id < RTE_MAX_ETHPORTS; (*port_id)++, devs++) {
> +		if (rte_eth_devices[*port_id].attached ^ devs->attached)
> +			return 0;
> +	}
> +	return -ENODEV;
> +}
> +
> +int
> +rte_eth_dev_get_addr_by_port(uint8_t port_id, struct rte_pci_addr
> +*addr) {
> +	if (!rte_eth_dev_is_valid_port(port_id)) {
> +		PMD_DEBUG_TRACE("Invalid port_id=%d\n", port_id);
> +		return -EINVAL;
> +	}
> +
> +	if (addr == NULL) {
> +		PMD_DEBUG_TRACE("Null pointer is specified\n");
> +		return -EINVAL;
> +	}
> +
> +	*addr = rte_eth_devices[port_id].pci_dev->addr;
> +	return 0;
> +}
> +
> +int
> +rte_eth_dev_get_port_by_addr(struct rte_pci_addr *addr, uint8_t
> +*port_id) {
> +	struct rte_pci_addr *tmp;
> +
> +	if ((addr == NULL) || (port_id == NULL)) {
> +		PMD_DEBUG_TRACE("Null pointer is specified\n");
> +		return -EINVAL;
> +	}
> +
> +	for (*port_id = 0; *port_id < RTE_MAX_ETHPORTS; (*port_id)++) {
> +		if (!rte_eth_devices[*port_id].attached)
> +			continue;
> +		if (!rte_eth_devices[*port_id].pci_dev)
> +			continue;
> +		tmp = &rte_eth_devices[*port_id].pci_dev->addr;
> +		if (rte_eal_compare_pci_addr(tmp, addr) == 0)
> +			return 0;
> +	}
> +	return -ENODEV;
> +}
> +
> +int
> +rte_eth_dev_get_name_by_port(uint8_t port_id, char *name) {
> +	char *tmp;
> +
> +	if (!rte_eth_dev_is_valid_port(port_id)) {
> +		PMD_DEBUG_TRACE("Invalid port_id=%d\n", port_id);
> +		return -EINVAL;
> +	}
> +
> +	if (name == NULL) {
> +		PMD_DEBUG_TRACE("Null pointer is specified\n");
> +		return -EINVAL;
> +	}
> +
> +	/* shouldn't check 'rte_eth_devices[i].data',
> +	 * because it might be overwritten by VDEV PMD */
> +	tmp = rte_eth_dev_data[port_id].name;
> +	strcpy(name, tmp);
> +	return 0;
> +}
> +
> +int
> +rte_eth_dev_is_detachable(uint8_t port_id) {
> +	uint32_t drv_flags;
> +
> +	if (port_id >= RTE_MAX_ETHPORTS) {
> +		PMD_DEBUG_TRACE("Invalid port_id=%d\n", port_id);
> +		return -EINVAL;
> +	}
> +
> +	drv_flags = rte_eth_devices[port_id].driver->pci_drv.drv_flags;
> +	return !(drv_flags & RTE_PCI_DRV_DETACHABLE); }
> +
>  static int
>  rte_eth_dev_rx_queue_config(struct rte_eth_dev *dev, uint16_t nb_queues)  { diff --git
> a/lib/librte_ether/rte_ethdev.h b/lib/librte_ether/rte_ethdev.h index 6cba06d..d4cfafb 100644
> --- a/lib/librte_ether/rte_ethdev.h
> +++ b/lib/librte_ether/rte_ethdev.h
> @@ -1476,6 +1476,89 @@ extern struct rte_eth_dev rte_eth_devices[];  extern uint8_t
> rte_eth_dev_count(void);
> 
>  /**
> + * Function for internal use by port hotplug functions.
> + * Copies current ethdev structures to the specified pointer.
> + *
> + * @param	devs	The pointer to the ethdev structures
> + * @param	size	The size of ethdev structures
> + * @return
> + *   - 0 on success, negative on error
> + */
> +extern int rte_eth_dev_save(struct rte_eth_dev *devs, size_t size);
> +
> +/**
> + * Function for internal use by port hotplug functions.
> + * Compare the specified ethdev structures with currents. Then
> + * if there is a port which status is changed, fill the specified
> +pointer
> + * with the port id of that port.
> + * @param	devs	The pointer to the ethdev structures
> + * @param	port_id	The pointer to the port id
> + * @return
> + *   - 0 on success, negative on error
> + */
> +extern int rte_eth_dev_get_changed_port(
> +		struct rte_eth_dev *devs, uint8_t *port_id);
> +
> +/**
> + * Function for internal use by port hotplug functions.
> + * Returns a pci address of a ethdev specified by port identifier.
> + * @param	port_id
> + *   The port identifier of the Ethernet device
> + * @param	addr
> + *   The pointer to the pci address
> + * @return
> + *   - 0 on success, negative on error
> + */
> +extern int rte_eth_dev_get_addr_by_port(
> +		uint8_t port_id, struct rte_pci_addr *addr);
> +
> +/**
> + * Function for internal use by port hotplug functions.
> + * Returns a port identifier of a ethdev specified by pci address.
> + * @param	addr
> + *   The pointer to the pci address of the Ethernet device.
> + * @param	port_id
> + *   The pointer to the port identifier
> + * @return
> + *   - 0 on success, negative on error
> + */
> +extern int rte_eth_dev_get_port_by_addr(
> +		struct rte_pci_addr *addr, uint8_t *port_id);
> +
> +/**
> + * Function for internal use by port hotplug functions.
> + * Returns a unique identifier name of a ethdev specified by port identifier.
> + * @param	port_id
> + *   The port identifier.
> + * @param	name
> + *  The pointer to the Unique identifier name for each Ethernet device
> + * @return
> + *   - 0 on success, negative on error
> + */
> +extern int rte_eth_dev_get_name_by_port(uint8_t port_id, char *name);
> +
> +/**
> + * Function for internal use by port hotplug functions.
> + * Check whether or not, a PMD that is handling the ethdev specified by
> +port
> + * identifier can support detach function.
> + * @param	port_id
> + *   The port identifier
> + * @return
> + *   - 0 on supporting detach function, negative on not supporting
> + */
> +extern int rte_eth_dev_is_detachable(uint8_t port_id);
> +
> +/**
> + * Function for internal use by port hotplug functions.
> + * Returns a ethdev slot specified by the unique identifier name.
> + * @param	name
> + *  The pointer to the Unique identifier name for each Ethernet device
> + * @return
> + *   - The pointer to the ethdev slot, on success. NULL on error
> + */
> +extern struct rte_eth_dev *rte_eth_dev_allocated(const char *name);
> +
> +/**
>   * Function for internal use by dummy drivers primarily, e.g. ring-based
>   * driver.
>   * Allocates a new ethdev slot for an ethernet device and returns the pointer diff --git
> a/lib/librte_ether/rte_ether_version.map b/lib/librte_ether/rte_ether_version.map
> index f66fd2d..099c769 100644
> --- a/lib/librte_ether/rte_ether_version.map
> +++ b/lib/librte_ether/rte_ether_version.map
> @@ -6,6 +6,7 @@ DPDK_2.0 {
>  	rte_eth_allmulticast_enable;
>  	rte_eth_allmulticast_get;
>  	rte_eth_dev_allocate;
> +	rte_eth_dev_allocated;
>  	rte_eth_dev_bypass_event_show;
>  	rte_eth_dev_bypass_event_store;
>  	rte_eth_dev_bypass_init;
> @@ -32,9 +33,14 @@ DPDK_2.0 {
>  	rte_eth_dev_filter_supported;
>  	rte_eth_dev_flow_ctrl_get;
>  	rte_eth_dev_flow_ctrl_set;
> +	rte_eth_dev_get_addr_by_port;
> +	rte_eth_dev_get_changed_port;

Hi Tetsuya,

rte_eth_dev_get_device_type;

needs to be added to rte_ether_version map to solve linking issue.

Regards,

Bernard.


>  	rte_eth_dev_get_mtu;
> +	rte_eth_dev_get_name_by_port;
> +	rte_eth_dev_get_port_by_addr;
>  	rte_eth_dev_get_vlan_offload;
>  	rte_eth_dev_info_get;
> +	rte_eth_dev_is_detachable;
>  	rte_eth_dev_mac_addr_add;
>  	rte_eth_dev_mac_addr_remove;
>  	rte_eth_dev_priority_flow_ctrl_set;
> @@ -44,6 +50,7 @@ DPDK_2.0 {
>  	rte_eth_dev_rss_reta_update;
>  	rte_eth_dev_rx_queue_start;
>  	rte_eth_dev_rx_queue_stop;
> +	rte_eth_dev_save;
>  	rte_eth_dev_set_link_down;
>  	rte_eth_dev_set_link_up;
>  	rte_eth_dev_set_mtu;
> --
> 1.9.1