[PATCH] mac80211: fix rx byte values not updated on mesh link

[Johannes Berg]

On Wed, 2020-12-02 at 10:25 +0530, Thiraviyam Mariyappan wrote:
> In mesh link, rx byte values were not updating though rx packets keep
> increasing in the station dump. This is because of rx_stats were updated
> regardless of USES_RSS flag is enabled/disabled. Solved the issue by
> updating the rx_stats from percpu pointers according to the USES_RSS flag

You should write commit logs in imperative voice, e.g. "Solve the
issue..."

> +++ b/net/mac80211/rx.c
> @@ -2212,6 +2212,7 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
>  	unsigned int frag, seq;
>  	struct ieee80211_fragment_entry *entry;
>  	struct sk_buff *skb;
> +	struct ieee80211_sta_rx_stats *stats;
>  
>  	hdr = (struct ieee80211_hdr *)rx->skb->data;
>  	fc = hdr->frame_control;
> @@ -2340,8 +2341,12 @@ ieee80211_rx_h_defragment(struct ieee80211_rx_data *rx)
>   out:
>  	ieee80211_led_rx(rx->local);
>   out_no_led:
> -	if (rx->sta)
> -		rx->sta->rx_stats.packets++;
> +	if (rx->sta) {
> +		stats = &rx->sta->rx_stats;
> +		if (ieee80211_hw_check(&rx->sdata->local->hw, USES_RSS))
> +			stats = this_cpu_ptr(rx->sta->pcpu_rx_stats);
> +		stats->packets++;
> +	}
>  	return RX_CONTINUE;
> 

This is certainly not only related to mesh, so the commit log is wrong.

Also, let's not copy/paste this code so much ...

johannes