Re: [PATCH] mac80211: Keep CoDel stats per txq, export them in debugfs.

[Johannes Berg <johannes@sipsolutions.net>]

> @@ -137,18 +137,20 @@ static int aqm_open(struct inode *inode, struct
> file *file)
>  	len += scnprintf(info->buf + len,
>  			 info->size - len,
>  			 "* vif\n"
> -			 "ifname addr ac backlog-bytes backlog-
> packets flows overlimit collisions tx-bytes tx-packets\n");
> +			 "ifname addr ac backlog-bytes backlog-
> packets flows drops marks overlimit collisions tx-bytes tx-
> packets\n");

It seems to me that you have to change the buffer length to take this
into account?
 
>  	list_for_each_entry_rcu(sdata, &local->interfaces, list) {
>  		txqi = to_txq_info(sdata->vif.txq);
>  		len += scnprintf(info->buf + len, info->size - len,
> -				 "%s %pM %u %u %u %u %u %u %u %u\n",
> +				 "%s %pM %u %u %u %u %u %u %u %u %u
> %u\n",
>  				 sdata->name,

Why is it this way anyway? It'd seem nicer to move the content of this
into the per-netdev subdirectories, and then it becomes a lot simpler
code too (yes, at the expense of some userspace, but still)

>  				 sdata->vif.addr,

This is also kinda pointless since it's easy to get elsewhere.

>  				 txqi->txq.ac,
>  				 txqi->tin.backlog_bytes,
>  				 txqi->tin.backlog_packets,
>  				 txqi->tin.flows,
> +				 txqi->cstats.drop_count,
> +				 txqi->cstats.ecn_mark,
>  				 txqi->tin.overlimit,
>  				 txqi->tin.collisions,
>  				 txqi->tin.tx_bytes,

Do you really want to add these in the middle? Seems that if you add
them at the end, you at least have *some* way of keeping this working
with older versions?

johannes