Re: [dpdk-dev] [PATCH v4 1/8] net/mvneta: add neta PMD skeleton

[Stephen Hemminger <stephen@networkplumber.org>]

On Wed, 19 Sep 2018 17:01:27 +0200
Andrzej Ostruszka <amo@semihalf.com> wrote:

> +/**
> + * Create private device structure.
> + *
> + * @param dev_name
> + *   Pointer to the port name passed in the initialization parameters.
> + *
> + * @return
> + *   Pointer to the newly allocated private device structure.
> + */
> +static struct mvneta_priv *
> +mvneta_priv_create(const char *dev_name)
> +{
> +	struct mvneta_priv *priv;
> +
> +	priv = rte_zmalloc_socket(dev_name, sizeof(*priv), 0, rte_socket_id());
> +	if (!priv)
> +		return NULL;
> +
> +	return priv;
> +}

Why make this a function, it really doesn't add anything over just doing it inline.


> +static int
> +mvneta_eth_dev_create(struct rte_vdev_device *vdev, const char *name)
> +{
> +	int ret, fd = socket(AF_INET, SOCK_DGRAM, 0);
> +	struct rte_eth_dev *eth_dev;
> +	struct mvneta_priv *priv;
> +	struct ifreq req;
> +
> +	eth_dev = rte_eth_dev_allocate(name);
> +	if (!eth_dev)
> +		return -ENOMEM;
> +
> +	priv = mvneta_priv_create(name);
> +
> +	if (!priv) {

nit: no blank line needed.

> +		ret = -ENOMEM;
> +		goto out_free_dev;

You have error goto's backwards.

> +	}
> +
> +	eth_dev->data->mac_addrs =
> +		rte_zmalloc("mac_addrs",
> +			    ETHER_ADDR_LEN * MVNETA_MAC_ADDRS_MAX, 0);
> +	if (!eth_dev->data->mac_addrs) {
> +		MVNETA_LOG(ERR, "Failed to allocate space for eth addrs");
> +		ret = -ENOMEM;
> +		goto out_free_priv;
> +	}
> +
> +	memset(&req, 0, sizeof(req));
> +	strcpy(req.ifr_name, name);



> +out_free_mac:
> +	rte_free(eth_dev->data->mac_addrs);
> +out_free_dev:
> +	rte_eth_dev_release_port(eth_dev);
> +out_free_priv:
> +	rte_free(priv);

These are backwards: out_free_priv is called if ioctl fails and will
leak eth_dev port.

> +	return ret;
> +}