Date: Thu, 12 Sep 2013 01:29:23 +0800 From: Chenchong Qin <qinchenchong@gmail.com> To: Adrian Chadd <adrian@freebsd.org> Cc: "freebsd-wireless@freebsd.org" <freebsd-wireless@freebsd.org> Subject: Re: Chenchong's work on net80211_ratectl Message-ID: <CAFnsE3e1r6Ah5SSrqnrxoqXMRm3yCaUxCjSD90epWQJEZU-pzw@mail.gmail.com> In-Reply-To: <CAFnsE3fvpjCXEC1gN46VXfPdeXG5RSVzNiJkZJiQ6xSYQFb89g@mail.gmail.com> References: <CAFnsE3dYdPf5yGTFH683Q1Zh0mc-g%2B_YtCTraNNt28z2vBoSKw@mail.gmail.com> <CAJ-Vmom4sY7jcNwWmJkrDwfWjsok2fk8UEwTi5A=egj1JyerLw@mail.gmail.com> <CAFnsE3cyg=msBfQqqKUMmLABSL=j24VoMBwbBjxQ6b7Dyy7Mqg@mail.gmail.com> <CAJ-Vmo=k8NddAYyAJCkx4eOaA_8XsSxg6uKrdddx%2BgmeT%2BX9KA@mail.gmail.com> <CAFnsE3eaOyRcO3LXSi3L=jbzpyMv5Nt_jRGKt_mmA0WV-EV5vA@mail.gmail.com> <CAJ-VmokdxLhK5x6kO=jJzk-dv61EDK-ZgmndOimoyWWf76HiZA@mail.gmail.com> <CAJ-VmonMjR5iVTMVN9532d%2BPqOXWNUoZvxPtQir5h=yGxU-XdQ@mail.gmail.com> <CAFnsE3d9nG-X2b=z1srKfTtpxC3w5L%2B6Hg3TbOnAQrJN%2Bt19GA@mail.gmail.com> <CAJ-VmokF6hPtg9FoEdeJXLLaZRNhzd=nr_o6nHE%2BjYiQKTg3zQ@mail.gmail.com> <CAFnsE3eMwX-GiRzJt8jk4r9mxwSAQkcrDwk%2BnWVG7q6dabeA3A@mail.gmail.com> <CAJ-Vmo=mzvS0UBC7fGx2t501%2Bfioi4DJcw8qobOpbYOUiraqGg@mail.gmail.com> <CAFnsE3df=1WEuLZh5355v_K2eBgcuBbpoza74Y-5vvNupBz22A@mail.gmail.com> <CAJ-VmokyXwkKLdsJw74bux7G5EJSRvFhugTcLR9BgXfw4ysYRg@mail.gmail.com> <CAJ-VmokU=ZXysjZfAJ-REZL7kwg-_Z-LeAKca7AefONW_O1E5A@mail.gmail.com> <CAFnsE3cS_2Ad1geQQ0UB4doEgqVfhNBMi6j4fCRpFgQqcu2kJw@mail.gmail.com> <CAFnsE3eMrwpo=hcFb9XfpLL53Ppso%2B%2BXTBfpieP8FGejAKW1_w@mail.gmail.com> <CAJ-Vmo=s=0u7VO00vgzxmR7bE4aTtMrshZ3j5F312dya284V1g@mail.gmail.com> <CAFnsE3c%2BOg_2hVXO3zU7gmY4xFQjnxbv=ehJm=pbbpLJcgwJrQ@mail.gmail.com> <CAJ-Vmo=D3BNhhSn9D3x6hBry=fDecOd7BwttQ5Yw2iUKGDBN3w@mail.gmail.com> <CAFnsE3dw5bOyVRqMb9K3ME%2BHoDL61-e_XNJjjt_nRTaY=4dnhw@mail.gmail.com> <CAJ-Vmo=0tkTKQnOjrmYKqWqC%2B_nnFLqimdp06STETxLsFgxKxQ@mail.gmail.com> <CAFnsE3dm27483GVp4PRiwk=sxagT7NXQz4fmyOpth2zpCM2MwQ@mail.gmail.com> <CAFnsE3fvpjCXEC1gN46VXfPdeXG5RSVzNiJkZJiQ6xSYQFb89g@mail.gmail.com>
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--20cf30780c5c5f629404e61ef669 Content-Type: text/plain; charset=ISO-8859-1 Hi! I've added some aggregation support here! At first I intend to pass subframe informations(nframes, per-subframe length etc.) to the ratectl api. But it seems to be a paradox that rate lookup must be performed before the ampdu is formed (aggregation limit based on the rate control decision is need) and subframe informations can be obtain only after the ampdu is formed. So, I add a new ieee80211_rc_info flag to ieee80211_ratectl to let it distinguish aggregation and non-aggregation scenarios. If rate lookup is called in an aggregation scenario, this flag is set. Then, ratectl algo knows that it's now finding rates for an ampdu and the framelen which records len of the first frame can be ignored. When it comes to complete period, tx status that shows number of subframes been sent and number of subframes been successfully received is passed to the ratectl api. I also get a question here - whether one tx that doesn't perform rate lookup will call the complete procedure? Thanks! Chenchong On Sun, Sep 8, 2013 at 11:18 PM, Chenchong Qin <qinchenchong@gmail.com>wrote: > Hi! > > I've added the common ratectl state as an mbuf tag! > > After days of frustration (compile errors, boot failed, kernel panics, > suddenly kernel freezing...), it seems that ath now can use 11n-aware > net80211 ratectl api to do rate control. Attachment[0] is the diff of > modifications to dev/ath. Changes to net80211 is minor this time. Just add > some debug msgs to it. Please reference my gsoc svn repo<https://svnweb.freebsd.org/socsvn/soc2013/ccqin/head/>; > . > > It's worth mentioning that sometimes the kernel will "freezing" (it looks > like all things stop working, screen is freezing, keyboard and mouse are > not responding) after wireless stuff start working for a while. At first, I > consider it caused by my modification to ath. But this strange thing can > also happen in a head kernel (r255382). Attachment[1] is some useful > messages just before it happens. By the way, I use a AR9227 device. > > And, I found that, for aggregation scenario, ath gathers tx information > and update the ratectl states. So, what we can do to net80211 to let it > support aggregation? > > Thanks! > > Chenchong > > > On Tue, Sep 3, 2013 at 9:29 AM, Chenchong Qin <qinchenchong@gmail.com>wrote: > >> OK! >> >> Thanks! :-) >> >> Chenchong >> >> >> On Tue, Sep 3, 2013 at 1:56 AM, Adrian Chadd <adrian@freebsd.org> wrote: >> >>> Hi! >>> >>> You can declare an mbuf tag and use that. Look at M_TXCB in net80211 and >>> how mbuf tags are added. >>> >>> I've long thought about adding a net80211 mbuf tag to represent -all- of >>> the tx related state - TX callback, rate control, rate completion, >>> aggregation state, retry count, etc. That way all the drivers can use it. >>> >>> >>> >>> -adrian >>> >>> >> > --20cf30780c5c5f629404e61ef669 Content-Type: application/octet-stream; name="20130911-net80211-ratectl-ath.diff" Content-Disposition: attachment; filename="20130911-net80211-ratectl-ath.diff" Content-Transfer-Encoding: base64 X-Attachment-Id: f_hlgtn9ja2 SW5kZXg6IGlmX2F0aF90eF9odC5jCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIGlmX2F0aF90eF9odC5jCShyZXZp c2lvbiAyNTQ4MjYpCisrKyBpZl9hdGhfdHhfaHQuYwkod29ya2luZyBjb3B5KQpAQCAtNjQsNiAr NjQsOCBAQAogCiAjaW5jbHVkZSA8bmV0ODAyMTEvaWVlZTgwMjExX3Zhci5oPgogI2luY2x1ZGUg PG5ldDgwMjExL2llZWU4MDIxMV9yZWdkb21haW4uaD4KKworI2luY2x1ZGUgPG5ldDgwMjExL2ll 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