> -----Original Message----- > From: Brian Norris [mailto:briannorris@xxxxxxxxxxxx] > Sent: Saturday, July 03, 2021 2:38 AM > To: Oleksij Rempel > Cc: Pkshih; Kalle Valo; linux-wireless; <netdev@xxxxxxxxxxxxxxx>; Sascha Hauer > Subject: Re: [PATCH 04/24] rtw89: add debug files > > On Fri, Jul 2, 2021 at 10:57 AM Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx> wrote: > > On Fri, Jul 02, 2021 at 10:08:53AM -0700, Brian Norris wrote: > > > On Fri, Jul 2, 2021 at 12:23 AM Oleksij Rempel <o.rempel@xxxxxxxxxxxxxx> wrote: > > > > For dynamic debugging we usually use ethtool msglvl. > > > > Please, convert all dev_err/warn/inf.... to netif_ counterparts > > > > > > Have you ever looked at a WiFi driver? > > > > Yes. You can parse the kernel log for my commits. > > OK! So I see you've touched a lot of ath9k, >3 years ago. You might > notice that it is one such example -- it supports exactly the same > kind of debugfs file, with a set of ath_dbg() log types. Why doesn't > it use this netif debug logging? > > > > I haven't seen a single one that uses netif_*() for logging. > > > On the other hand, almost every > > > single one has a similar module parameter or debugfs knob for enabling > > > different types of debug messages. > > > > > > As it stands, the NETIF_* categories don't really align at all with > > > the kinds of message categories most WiFi drivers support. Do you > > > propose adding a bunch of new options to the netif debug feature? > > > > Why not? It make no sense or it is just "it is tradition, we never do > > it!" ? > > Well mainly, I don't really like people dreaming up arbitrary rules > and enforcing them only on new submissions. If such a change was > Recommended, it seems like a better first step would be to prove that > existing drivers (where there are numerous examples) can be converted > nicely, instead of pushing the work to new contributors arbitrarily. > Otherwise, the bar for new contributions gets exceedingly high -- this > one has already sat for more than 6 months with depressingly little > useful feedback. > > I also know very little about this netif log level feature, but if it > really depends on ethtool (seems like it does?) -- I don't even bother > installing ethtool on most of my systems. It's much easier to poke at > debugfs, sysfs, etc., than to construct the relevant ethtool ioctl()s > or netlink messages. It also seems that these debug knobs can't be set > before the driver finishes coming up, so one would still need a module > parameter to mirror some of the same features. Additionally, a WiFi > driver doesn't even have a netdev to speak of until after a lot of the > interesting stuff comes up (much of the mac80211 framework focuses on > a |struct ieee80211_hw| and a |struct wiphy|), so I'm not sure your > suggestion really fits these sorts of drivers (and the things they > might like to support debug-logging for) at all. > > Anyway, if Ping-Ke wants to paint this bikeshed for you, I won't stop him. I encounter the problems you mentioned mostly: 1. no netdev to be the parameter 'dev' of 'netif_dbg(priv, type, dev, format, args...)' 2. predefined 'type' isn't enough for wifi application. There're many wifi- or vendor- specific components, such as RF calibration, BT coexistence, DIG, CFO and so on. So, I don't plan to change them for now. -- Ping-Ke
