Re: [PATCH v2 net-next 1/5] net: dsa: microchip: add rmon grouping for ethtool statistics

Alexander Lobakin
2023-02-17T15:03:17Z

From: Rakesh Sankaranarayanan <rakesh.sankaranarayanan@microchip.com>
Date: Fri, 17 Feb 2023 16:32:07 +0530

> Add support for ethtool standard device statistics grouping. Support rmon
> statistics grouping using rmon groups parameter in ethtool command. rmon
> provides packet size based range grouping. Common mib parameters are used
> across all KSZ series swtches for packet size statistics, except for
> KSZ8830. KSZ series have mib counters for packets with size:

[...]

> +void ksz8_get_rmon_stats(struct ksz_device *dev, int port,
> + struct ethtool_rmon_stats *rmon_stats,
> + const struct ethtool_rmon_hist_range **ranges)
> +{
> + struct ksz_port_mib *mib;
> + u64 *cnt;

Nit: I guess it can be const since you only read it (in every such
callback)?

> + u8 i;
> +
> + mib = &dev->ports[port].mib;
> +
> + mutex_lock(&mib->cnt_mutex);
> +
> + cnt = &mib->counters[KSZ8_RX_UNDERSIZE];
> + dev->dev_ops->r_mib_pkt(dev, port, KSZ8_RX_UNDERSIZE, NULL, cnt);
> + rmon_stats->undersize_pkts = *cnt;
> +
> + cnt = &mib->counters[KSZ8_RX_OVERSIZE];
> + dev->dev_ops->r_mib_pkt(dev, port, KSZ8_RX_OVERSIZE, NULL, cnt);
> + rmon_stats->oversize_pkts = *cnt;
> +
> + cnt = &mib->counters[KSZ8_RX_FRAGMENTS];
> + dev->dev_ops->r_mib_pkt(dev, port, KSZ8_RX_FRAGMENTS, NULL, cnt);
> + rmon_stats->fragments = *cnt;
> +
> + cnt = &mib->counters[KSZ8_RX_JABBERS];
> + dev->dev_ops->r_mib_pkt(dev, port, KSZ8_RX_JABBERS, NULL, cnt);
> + rmon_stats->jabbers = *cnt;
> +
> + for (i = 0; i < KSZ8_HIST_LEN; i++) {
> + cnt = &mib->counters[KSZ8_RX_64_OR_LESS + i];
> + dev->dev_ops->r_mib_pkt(dev, port,
> + (KSZ8_RX_64_OR_LESS + i), NULL, cnt);

Weird linewrap. Please align the following lines with the opening brace
of the first one, e.g.

dev->dev_ops->r_mib_pkt(dev, port,
KSZ8_RX_64_OR_LESS + i, NULL,
cnt);

BUT I don't see why you need those braces around `macro + i` and without
them you can fit it into the previous line I believe.

> + rmon_stats->hist[i] = *cnt;
> + }
> +
> + mutex_unlock(&mib->cnt_mutex);
> +
> + *ranges = ksz_rmon_ranges;
> +}
> +
> +void ksz9477_get_rmon_stats(struct ksz_device *dev, int port,
> + struct ethtool_rmon_stats *rmon_stats,
> + const struct ethtool_rmon_hist_range **ranges)
> +{
> + struct ksz_port_mib *mib;
> + u64 *cnt;
> + u8 i;
> +
> + mib = &dev->ports[port].mib;
> +
> + mutex_lock(&mib->cnt_mutex);
> +
> + cnt = &mib->counters[KSZ9477_RX_UNDERSIZE];
> + dev->dev_ops->r_mib_pkt(dev, port, KSZ9477_RX_UNDERSIZE, NULL, cnt);
> + rmon_stats->undersize_pkts = *cnt;
> +
> + cnt = &mib->counters[KSZ9477_RX_OVERSIZE];
> + dev->dev_ops->r_mib_pkt(dev, port, KSZ9477_RX_OVERSIZE, NULL, cnt);
> + rmon_stats->oversize_pkts = *cnt;
> +
> + cnt = &mib->counters[KSZ9477_RX_FRAGMENTS];
> + dev->dev_ops->r_mib_pkt(dev, port, KSZ9477_RX_FRAGMENTS, NULL, cnt);
> + rmon_stats->fragments = *cnt;
> +
> + cnt = &mib->counters[KSZ9477_RX_JABBERS];
> + dev->dev_ops->r_mib_pkt(dev, port, KSZ9477_RX_JABBERS, NULL, cnt);
> + rmon_stats->jabbers = *cnt;
> +
> + for (i = 0; i < KSZ9477_HIST_LEN; i++) {
> + cnt = &mib->counters[KSZ9477_RX_64_OR_LESS + i];
> + dev->dev_ops->r_mib_pkt(dev, port,
> + (KSZ9477_RX_64_OR_LESS + i), NULL, cnt);

(same, and please check all other places in the series)

> + rmon_stats->hist[i] = *cnt;
> + }
> +
> + mutex_unlock(&mib->cnt_mutex);
> +
> + *ranges = ksz_rmon_ranges;
> +}
[...]

Thanks,
Olek