Re: [PATCH v3] Change rte_eal_vdev_init to update port_id

[Tetsuya Mukawa <mukawa@igel.co.jp>]

On 2015/09/24 6:16, Ravi Kerur wrote:
> v3:
>    > Isolate changes within rte_ether component.
>
> v2:
>    > Remove tilegx changes
>    > Use rte_eal_compare_pci_addr for address comparison
>    > Use dpdk_2.2 in version map file for new functions
>
> v1:
> Changes include
>    > Modify rte_eal_vdev_init to return allocated port_id
>    > Modify rte_eal_probe_one to return allocated port_id
>
> 2. Removed following functions
>    > rte_eth_dev_save and
>    > rte_eth_dev_get_changed_port
>
> 3. Added 2 new functions
>    > rte_eth_dev_get_port_by_name
>    > rte_eth_dev_get_port_by_addr
>
> 4. Fix return error(ENOMEM) in function rte_pmd_mpipe_devinit
>
> Compiled on Linux for following targets
>    > x86_64-native-linuxapp-gcc
>    > x86_64-native-linuxapp-clang
>    > x86_x32-native-linuxapp-gcc
>
> Compiled on FreeBSD for following targets
>    > x86_64-native-bsdapp-clang
>    > x86_64-native-bsdapp-gcc
>
> Tested on Linux/FreeBSD:
>    > port attach eth_null
>    > port start all
>    > port stop all
>    > port close all
>    > port detach 0
>    > port attach eth_null
>    > port start all
>    > port stop all
>    > port close all
>    > port detach 0
>
> Successful run of checkpatch.pl on the diffs
>
> Successful validate_abi on Linux for following targets
>
>    > x86_64-native-linuxapp-gcc
>    > x86_64-native-linuxapp-clang
>
> Signed-off-by: Ravi Kerur <rkerur@gmail.com>
> ---
>  lib/librte_ether/rte_ethdev.c | 116 +++++++++++++++++++++++-------------------
>  1 file changed, 63 insertions(+), 53 deletions(-)
>
> diff --git a/lib/librte_ether/rte_ethdev.c b/lib/librte_ether/rte_ethdev.c
> index b309309..e4b8e41 100644
> --- a/lib/librte_ether/rte_ethdev.c
> +++ b/lib/librte_ether/rte_ethdev.c
> @@ -442,32 +442,6 @@ rte_eth_dev_get_device_type(uint8_t port_id)
>  }
>  
>  static 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;
> -}
> -
> -static 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;
> -}
> -
> -static int
>  rte_eth_dev_get_addr_by_port(uint8_t port_id, struct rte_pci_addr *addr)
>  {
>  	VALID_PORTID_OR_ERR_RET(port_id, -EINVAL);
> @@ -501,6 +475,59 @@ rte_eth_dev_get_name_by_port(uint8_t port_id, char *name)
>  }
>  
>  static int
> +rte_eth_dev_get_port_by_name(const char *name, uint8_t *port_id)
> +{
> +	int i;
> +
> +	if (name == NULL) {
> +		PMD_DEBUG_TRACE("Null pointer is specified\n");
> +		return -EINVAL;
> +	}
> +
> +	*port_id = RTE_MAX_ETHPORTS;
> +
> +	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
> +
> +		if (!strncmp(name,
> +			rte_eth_dev_data[i].name, strlen(name))) {
> +
> +			*port_id = i;
> +
> +			return 0;
> +		}
> +	}
> +	return -ENODEV;
> +}
> +
> +static int
> +rte_eth_dev_get_port_by_addr(const struct rte_pci_addr *addr, uint8_t *port_id)
> +{
> +	int i;
> +	struct rte_pci_device *pci_dev = NULL;
> +
> +	if (addr == NULL) {
> +		PMD_DEBUG_TRACE("Null pointer is specified\n");
> +		return -EINVAL;
> +	}
> +
> +	*port_id = RTE_MAX_ETHPORTS;
> +
> +	for (i = 0; i < RTE_MAX_ETHPORTS; i++) {
> +
> +		pci_dev = rte_eth_devices[i].pci_dev;
> +
> +		if (pci_dev &&
> +			!rte_eal_compare_pci_addr(&pci_dev->addr, addr)) {
> +
> +			*port_id = i;
> +
> +			return 0;
> +		}
> +	}
> +	return -ENODEV;
> +}
> +
> +static int
>  rte_eth_dev_is_detachable(uint8_t port_id)
>  {
>  	uint32_t drv_flags;
> @@ -530,30 +557,19 @@ rte_eth_dev_is_detachable(uint8_t port_id)
>  static int
>  rte_eth_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 */
> -	if (rte_eth_dev_save(devs, sizeof(devs)))
> -		goto err;
>  	/* re-construct pci_device_list */
>  	if (rte_eal_pci_scan())
>  		goto err;
> -	/* invoke probe func of the driver can handle the new device.
> -	 * TODO:
> -	 * rte_eal_pci_probe_one() should return port_id.
> -	 * And rte_eth_dev_save() and rte_eth_dev_get_changed_port()
> -	 * should be removed. */
> +	/* 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))
> +
> +	if (rte_eth_dev_get_port_by_addr(addr, port_id))
>  		goto err;
>  
> -	*port_id = new_port_id;
>  	return 0;
>  err:
>  	RTE_LOG(ERR, EAL, "Driver, cannot attach the device\n");
> @@ -600,8 +616,6 @@ static int
>  rte_eth_dev_attach_vdev(const char *vdevargs, uint8_t *port_id)
>  {
>  	char *name = NULL, *args = NULL;
> -	uint8_t new_port_id;
> -	struct rte_eth_dev devs[RTE_MAX_ETHPORTS];
>  	int ret = -1;
>  
>  	if ((vdevargs == NULL) || (port_id == NULL))
> @@ -611,22 +625,18 @@ rte_eth_dev_attach_vdev(const char *vdevargs, uint8_t *port_id)
>  	if (rte_eal_parse_devargs_str(vdevargs, &name, &args))
>  		goto end;
>  
> -	/* save current port status */
> -	if (rte_eth_dev_save(devs, sizeof(devs)))
> -		goto end;
>  	/* walk around dev_driver_list to find the driver of the device,
> -	 * then invoke probe function o the driver.
> -	 * TODO:
> -	 * rte_eal_vdev_init() should return port_id,
> -	 * And rte_eth_dev_save() and rte_eth_dev_get_changed_port()
> -	 * should be removed. */
> +	 * then invoke probe function of the driver.
> +	 * rte_eal_vdev_init() updates port_id allocated after
> +	 * initialization.
> +	 */
>  	if (rte_eal_vdev_init(name, args))
>  		goto end;
> -	/* get port_id enabled by above procedures */
> -	if (rte_eth_dev_get_changed_port(devs, &new_port_id))
> +
> +	if (rte_eth_dev_get_port_by_name(name, port_id))
>  		goto end;
> +
>  	ret = 0;
> -	*port_id = new_port_id;
>  end:
>  	if (name)
>  		free(name);

Acked-by: Tetsuya Mukawa <mukawa@igel.co.jp>