Re: [PATCH net-next v13 3/3] net: hisilicon: new hip04 ethernet driver

Joe Perches
2015-01-15T04:39:02Z

On Wed, 2015-01-14 at 14:34 +0800, Ding Tianhong wrote:
> Support Hisilicon hip04 ethernet driver, including 100M / 1000M controller.
> The controller has no tx done interrupt, reclaim xmitted buffer in the poll.

Mostly trivial comments:

> +++ b/drivers/net/ethernet/hisilicon/hip04_eth.c

[]

> +#define GMAC_MAX_PKT_LEN 1516

[]

> +static int hip04_rx_poll(struct napi_struct *napi, int budget)
> +{
[]
> + while (cnt && !last) {
[]
> + desc = (struct rx_desc *)skb->data;
> + len = be16_to_cpu(desc->pkt_len);
> + err = be32_to_cpu(desc->pkt_err);
> +
> + if (0 == len) {
> + dev_kfree_skb_any(skb);
> + last = true;
> + } else if ((err & RX_PKT_ERR) || (len >= GMAC_MAX_PKT_LEN)) {

Is this ">=" correct? Maybe it should be ">" ?

[]

> +static irqreturn_t hip04_mac_interrupt(int irq, void *dev_id)
> +{
> + struct net_device *ndev = (struct net_device *)dev_id;

Unnecessary cast of void *

[]

> +static int hip04_set_coalesce(struct net_device *netdev,
> + struct ethtool_coalesce *ec)
> +{
> + struct hip04_priv *priv = netdev_priv(netdev);
> +
> + /* Check not supported parameters */
> + if ((ec->rx_max_coalesced_frames) || (ec->rx_coalesce_usecs_irq) ||
> + (ec->rx_max_coalesced_frames_irq) || (ec->tx_coalesce_usecs_irq) ||
> + (ec->use_adaptive_rx_coalesce) || (ec->use_adaptive_tx_coalesce) ||
> + (ec->pkt_rate_low) || (ec->rx_coalesce_usecs_low) ||
> + (ec->rx_max_coalesced_frames_low) || (ec->tx_coalesce_usecs_high) ||
> + (ec->tx_max_coalesced_frames_low) || (ec->pkt_rate_high) ||
> + (ec->tx_coalesce_usecs_low) || (ec->rx_coalesce_usecs_high) ||
> + (ec->rx_max_coalesced_frames_high) || (ec->rx_coalesce_usecs) ||
> + (ec->tx_max_coalesced_frames_irq) ||
> + (ec->stats_block_coalesce_usecs) ||
> + (ec->tx_max_coalesced_frames_high) || (ec->rate_sample_interval))
> + return -EOPNOTSUPP;

Rather than a somewhat haphazard mix of these values,
this might be simpler to read as something like:

/* Check not supported parameters */
if (ec->pkt_rate_low ||
ec->pkt_rate_high ||

ec->use_adaptive_rx_coalesce ||
ec->rx_coalesce_usecs ||
ec->rx_coalesce_usecs_low ||
ec->rx_coalesce_usecs_high ||
ec->rx_coalesce_usecs_irq ||
ec->rx_max_coalesced_frames ||
ec->rx_max_coalesced_frames_low ||
ec->rx_max_coalesced_frames_high ||
ec->rx_max_coalesced_frames_irq ||

ec->use_adaptive_tx_coalesce ||
ec->tx_coalesce_usecs_low ||
ec->tx_coalesce_usecs_high ||
ec->tx_max_coalesced_frames_low ||
ec->tx_max_coalesced_frames_high ||
ec->tx_max_coalesced_frames_irq ||

ec->stats_block_coalesce_usecs ||
ec->rate_sample_interval)
return -EOPNOTSUPP;

> +static void hip04_free_ring(struct net_device *ndev, struct device *d)
> +{
> + struct hip04_priv *priv = netdev_priv(ndev);
> + int i;
> +
> + for (i = 0; i < RX_DESC_NUM; i++)
> + if (priv->rx_buf[i])
> + put_page(virt_to_head_page(priv->rx_buf[i]));

It's generally nicer to use braces around
for loops with single ifs.

> +
> + for (i = 0; i < TX_DESC_NUM; i++)
> + if (priv->tx_skb[i])
> + dev_kfree_skb_any(priv->tx_skb[i]);