Date: Sat, 10 Sep 2011 20:24:28 +0800 From: Adrian Chadd <adrian@freebsd.org> To: freebsd-wireless@freebsd.org Subject: [patch] if_ath_tx: change interrupt scheduling deferral Message-ID: <CAJ-VmoknpF_RhiXWL07GSOqWoHpy3L5Ma4kCptHq9MtfbfPO8w@mail.gmail.com>
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--20cf30563dc1128eb404ac9560ca Content-Type: text/plain; charset=ISO-8859-1 Hi, This patch changes how the deferred interrupt handling works. It's likely I'll have to change things a bit before I commit it so I won't be (yet) committing this. It brings the interrupt handling in line with how ath9k and the reference driver works. It eliminates a possible race condition: * ath_intr() and ath_hal_getisr() set AH5212(ah)->ah_intrTxqs, which is a bitmap of TXQs which need servicing; * The ath TX processes call txqactive() which check the above bitmap and clear the bit that's been tested. The interrupt handler ath_intr() can be called during the TX completion task, so I think it's possible that the interrupt could occur, setting a TXQ bit, in between txqactive()'s "check bit X" and "clear bit X". My testing was only showing up one queue hang every 20-50 million packets where the TXQ had active packets in it which were completed, but hadn't been processed. I've only just begun testing this. I'll post updates as they're needed. Thanks, Adrian --20cf30563dc1128eb404ac9560ca Content-Type: application/octet-stream; name="ar5416-int-sched.diff" Content-Disposition: attachment; filename="ar5416-int-sched.diff" Content-Transfer-Encoding: base64 X-Attachment-Id: f_gsekhd1l0 SW5kZXg6IGlmX2F0aHZhci5oCj09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KLS0tIGlmX2F0aHZhci5oCShyZXZpc2lvbiAy MjU0NjcpCisrKyBpZl9hdGh2YXIuaAkod29ya2luZyBjb3B5KQpAQCAtNDExLDYgKzQxMSw3IEBA CiAJdV9pbnQJCQlzY19mZnR4cW1heDsJLyogbWF4IGZyYW1lcyBiZWZvcmUgZHJvcCAqLwogCXVf aW50CQkJc2NfdHhhbnRlbm5hOwkvKiB0eCBhbnRlbm5hIChmaXhlZCBvciBhdXRvKSAqLwogCUhB TF9JTlQJCQlzY19pbWFzazsJLyogaW50ZXJydXB0IG1hc2sgY29weSAqLworCUhBTF9JTlQJCQlz Y19pbnRyc3RhdHVzOwkvKiBjdXJyZW50IGludGVycnVwdCBzdGF0dXMgKi8KIAl1X2ludAkJCXNj X2tleW1heDsJLyogc2l6ZSBvZiBrZXkgY2FjaGUgKi8KIAl1X2ludDhfdAkJc2Nfa2V5bWFwW0FU SF9LRVlCWVRFU107Lyoga2V5IHVzZSBiaXQgbWFwICovCiAKQEAgLTQyOSw3ICs0MzAsNiBAQAog 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