Return-path: Received: from cora.hrz.tu-chemnitz.de ([134.109.228.40]:42278 "EHLO cora.hrz.tu-chemnitz.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755089Ab3DVUe5 (ORCPT ); Mon, 22 Apr 2013 16:34:57 -0400 From: Simon Wunderlich To: linville@tuxdriver.com Cc: linux-wireless@vger.kernel.org, ath9k-devel@venema.h4ckr.net, Mathias Kretschmer , Simon Wunderlich Subject: [PATCH-RESEND] ath9k: apply coverage class on slottime too Date: Mon, 22 Apr 2013 22:34:41 +0200 Message-Id: <1366662881-11249-1-git-send-email-siwu@hrz.tu-chemnitz.de> (sfid-20130422_223502_624300_E6C9C6CD) Sender: linux-wireless-owner@vger.kernel.org List-ID: From: Mathias Kretschmer According to 802.11-2007 17.3.8.6 (slot time), the slot time should be increased by 3 us * coverage class. The code only increased the ack timeout, which is fixed by this patch. We have noticed in our long shot scenario that we see less collisions with this patch. Signed-off-by: Mathias Kretschmer [add standard reference and commit message] Signed-off-by: Simon Wunderlich --- resent after further testing and concensus (original patch from Oct 2012, no changes made) --- drivers/net/wireless/ath/ath9k/hw.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/wireless/ath/ath9k/hw.c b/drivers/net/wireless/ath/ath9k/hw.c index 10eb6ba..7f25da8 100644 --- a/drivers/net/wireless/ath/ath9k/hw.c +++ b/drivers/net/wireless/ath/ath9k/hw.c @@ -1100,7 +1100,8 @@ void ath9k_hw_init_global_settings(struct ath_hw *ah) } /* As defined by IEEE 802.11-2007 17.3.8.6 */ - acktimeout = slottime + sifstime + 3 * ah->coverage_class + ack_offset; + slottime += 3 * ah->coverage_class; + acktimeout = slottime + sifstime + ack_offset; ctstimeout = acktimeout; /* -- 1.7.10.4