[spp] [PATCH v2 4/6] shared: add dev_detach_by_port_id

[Yasufumi Ogawa]

> SPP uses deprecated APIs removed in DPDK v18.11. Using rte_eth_hotplug_remove()
> is recommended instead of rte_eth_dev_detach()[1].  This patch is to add
> dev_detach_by_port_id() to shared directory so that spp_primary, spp_nfv,
> spp_vm and spp_vf can refer this new function.
Hideyuki,

Commit message should be wrapped at 72 characters, but 1st and 3rd lines 
exceeds the limitation.

Thanks
> 
> [1]https://mails.dpdk.org/archives/dev/2018-October/117115.html
> 
> Signed-off-by: Hideyuki Yamashita <yamashita.hideyuki at po.ntt-tx.co.jp>
> Signed-off-by: Naoki Takada <takada.naoki at lab.ntt.co.jp>
> ---
>   src/shared/common.c | 38 ++++++++++++++++++++++++++++++++++++++
>   src/shared/common.h | 12 ++++++++++++
>   2 files changed, 50 insertions(+)
> 
> diff --git a/src/shared/common.c b/src/shared/common.c
> index c88ce14..0e32fa6 100644
> --- a/src/shared/common.c
> +++ b/src/shared/common.c
> @@ -526,3 +526,41 @@ dev_attach_by_devargs(const char *devargs, uint16_t *port_id)
>   
>   	return ret;
>   }
> +
> +/* detach the device, then store the name of the device */
> +int
> +dev_detach_by_port_id(uint16_t port_id)
> +{
> +	struct rte_device *dev;
> +	struct rte_bus *bus;
> +	uint32_t dev_flags;
> +	int ret = -1;
> +
> +	if (rte_eth_devices[port_id].data == NULL) {
> +		RTE_LOG(INFO, APP,
> +			"rte_eth_devices[%d].data is  NULL\n", port_id);
> +		return 0;
> +	}
> +	dev_flags = rte_eth_devices[port_id].data->dev_flags;
> +	if (dev_flags & RTE_ETH_DEV_BONDED_SLAVE) {
> +		RTE_LOG(ERR, APP,
> +			"Port %"PRIu16" is bonded, cannot detach\n", port_id);
> +		return -ENOTSUP;
> +	}
> +
> +	dev = rte_eth_devices[port_id].device;
> +	if (dev == NULL)
> +		return -EINVAL;
> +
> +	bus = rte_bus_find_by_device(dev);
> +	if (bus == NULL)
> +		return -ENOENT;
> +
> +	ret = rte_eal_hotplug_remove(bus->name, dev->name);
> +	if (ret < 0)
> +		return ret;
> +
> +	rte_eth_dev_release_port(&rte_eth_devices[port_id]);
> +
> +	return 0;
> +}
> diff --git a/src/shared/common.h b/src/shared/common.h
> index 60514e5..09dbf8a 100644
> --- a/src/shared/common.h
> +++ b/src/shared/common.h
> @@ -234,4 +234,16 @@ int spp_atoi(const char *str, int *val);
>   int
>   dev_attach_by_devargs(const char *devargs, uint16_t *port_id);
>   
> +/**
> + * Detach a Ethernet device specified by port identifier.
> + * This function must be called when the device is in the
> + * closed state.
> + *
> + * @param port_id
> + *   The port identifier of the device to detach.
> + * @return
> + *  0 on success and devname is filled, negative on error
> + */
> +int dev_detach_by_port_id(uint16_t port_id);
> +
>   #endif
>