[dpdk-dev] [RFC] af_packet: support port hotplug

[Iremonger, Bernard]

> -----Original Message-----
> From: dev [mailto:dev-bounces at dpdk.org] On Behalf Of John W. Linville
> Sent: Tuesday, March 10, 2015 6:36 PM
> To: dev at dpdk.org
> Subject: [dpdk-dev] [RFC] af_packet: support port hotplug
> 
> This patch adds finalization code to free resources allocated by the PMD.  This is based on earlier
> patches for other PMDs by Tetsuya Mukawa <mukawa at igel.co.jp>, with corrections related to data-
> >name.
> 
> Signed-off-by: John W. Linville <linville at tuxdriver.com>
> Cc: Tetsuya Mukawa <mukawa at igel.co.jp>
> ---
>  lib/librte_pmd_af_packet/rte_eth_af_packet.c | 56 ++++++++++++++++++++++++++++
>  1 file changed, 56 insertions(+)
> 
> diff --git a/lib/librte_pmd_af_packet/rte_eth_af_packet.c
> b/lib/librte_pmd_af_packet/rte_eth_af_packet.c
> index 80e9bdf7f819..57998ab19c96 100644
> --- a/lib/librte_pmd_af_packet/rte_eth_af_packet.c
> +++ b/lib/librte_pmd_af_packet/rte_eth_af_packet.c
> @@ -399,6 +399,13 @@ static struct eth_dev_ops ops = {
>  	.stats_reset = eth_stats_reset,
>  };
> 
> +static struct eth_driver rte_af_packet_pmd = {
> +	.pci_drv = {
> +		.name = "rte_af_packet_pmd",
> +		.drv_flags = RTE_PCI_DRV_DETACHABLE,
> +	},
> +};
> +
>  /*
>   * Opens an AF_PACKET socket
>   */
> @@ -653,6 +660,10 @@ rte_pmd_init_internals(const char *name,
>  	if (*eth_dev == NULL)
>  		goto error;
> 
> +	/* check length of device name */
> +	if ((strlen((*eth_dev)->data->name) + 1) > sizeof(data->name))
> +		goto error;
> +
>  	/*
>  	 * now put it all together
>  	 * - store queue data in internals,
> @@ -669,12 +680,14 @@ rte_pmd_init_internals(const char *name,
>  	data->nb_tx_queues = (uint16_t)nb_queues;
>  	data->dev_link = pmd_link;
>  	data->mac_addrs = &(*internals)->eth_addr;
> +	strncpy(data->name, (*eth_dev)->data->name,
> +strlen((*eth_dev)->data->name));
> 
>  	pci_dev->numa_node = numa_node;
> 
>  	(*eth_dev)->data = data;
>  	(*eth_dev)->dev_ops = &ops;
>  	(*eth_dev)->pci_dev = pci_dev;
> +	(*eth_dev)->driver = &rte_af_packet_pmd;
> 
>  	return 0;
> 
> @@ -835,10 +848,53 @@ rte_pmd_af_packet_devinit(const char *name, const char *params)
>  	return 0;
>  }
> 
> +static int
> +rte_pmd_af_packet_devuninit(const char *name) {
> +	struct rte_eth_dev *eth_dev = NULL;
> +	struct pmd_internals *internals;
> +	struct tpacket_req req;
> +
> +	unsigned q;
> +
> +	RTE_LOG(INFO, PMD, "Closing AF_PACKET ethdev on numa socket %u\n",
> +			rte_socket_id());
> +
> +	if (name == NULL)
> +		return -1;

Hi  Tetsuya, John,

Before detaching a port, the port must be stopped and closed.
The stop and close are only allowed for RTE_PROC_PRIMARY.
Should there be a check for process_type here?

if (rte_eal_process_type() != RTE_PROC_PRIMARY)
	return -EPERM;

Regards,

Bernard

> +
> +	/* retrieve ethdev entry */
> +	eth_dev = rte_eth_dev_allocated(name);
> +	if (eth_dev == NULL)
> +		return -1;
> +
> +	internals = eth_dev->data->dev_private;
> +	req = internals->req;
> +
> +	for (q = 0; q < internals->nb_queues; q++) {
> +		munmap(internals->rx_queue[q].map,
> +		       2 * req.tp_block_size * req.tp_block_nr);
> +		if (internals->rx_queue[q].rd)
> +			rte_free(internals->rx_queue[q].rd);
> +		if (internals->tx_queue[q].rd)
> +			rte_free(internals->tx_queue[q].rd);
> +	}
> +
> +	rte_free(internals);
> +	rte_free(eth_dev->data);
> +	rte_free(eth_dev->pci_dev);
> +
> +	rte_eth_dev_release_port(eth_dev);
> +
> +
> +	return 0;
> +}
> +
>  static struct rte_driver pmd_af_packet_drv = {
>  	.name = "eth_af_packet",
>  	.type = PMD_VDEV,
>  	.init = rte_pmd_af_packet_devinit,
> +	.uninit = rte_pmd_af_packet_devuninit,
>  };
> 
>  PMD_REGISTER_DRIVER(pmd_af_packet_drv);
> --
> 2.1.0