From patchwork Sat Nov 7 20:18:53 2009 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Luis Rodriguez X-Patchwork-Id: 58353 Received: from vger.kernel.org (vger.kernel.org [209.132.176.167]) by demeter.kernel.org (8.14.2/8.14.2) with ESMTP id nA7KJeaX011438 for ; Sat, 7 Nov 2009 20:19:40 GMT Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752940AbZKGUTd (ORCPT ); Sat, 7 Nov 2009 15:19:33 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752939AbZKGUTc (ORCPT ); Sat, 7 Nov 2009 15:19:32 -0500 Received: from bombadil.infradead.org ([18.85.46.34]:56213 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752863AbZKGUTI (ORCPT ); Sat, 7 Nov 2009 15:19:08 -0500 Received: from mcgrof by bombadil.infradead.org with local (Exim 4.69 #1 (Red Hat Linux)) id 1N6rkZ-0004hG-Pp; Sat, 07 Nov 2009 20:19:07 +0000 From: "Luis R. Rodriguez" To: linville@tuxdriver.com Cc: linux-wireless@vger.kernel.org, devel@driverdev.osuosl.org, mcgrof@gmail.com, "Luis R. Rodriguez" Subject: [PATCH 16/29] ath9k: move qual processing into a helper Date: Sat, 7 Nov 2009 15:18:53 -0500 Message-Id: <1257625146-17971-17-git-send-email-lrodriguez@atheros.com> X-Mailer: git-send-email 1.6.2.rc1.3.g81d3f In-Reply-To: <1257625146-17971-1-git-send-email-lrodriguez@atheros.com> References: <1257625146-17971-1-git-send-email-lrodriguez@atheros.com> Sender: linux-wireless-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org diff --git a/drivers/net/wireless/ath/ath9k/recv.c b/drivers/net/wireless/ath/ath9k/recv.c index 9eae946..d357b9a 100644 --- a/drivers/net/wireless/ath/ath9k/recv.c +++ b/drivers/net/wireless/ath/ath9k/recv.c @@ -190,6 +190,47 @@ static u8 ath9k_process_rate(struct ath_common *common, } /* + * Theory for reporting quality: + * + * At a hardware RSSI of 45 you will be able to use MCS 7 reliably. + * At a hardware RSSI of 45 you will be able to use MCS 15 reliably. + * At a hardware RSSI of 35 you should be able use 54 Mbps reliably. + * + * MCS 7 is the highets MCS index usable by a 1-stream device. + * MCS 15 is the highest MCS index usable by a 2-stream device. + * + * All ath9k devices are either 1-stream or 2-stream. + * + * How many bars you see is derived from the qual reporting. + * + * A more elaborate scheme can be used here but it requires tables + * of SNR/throughput for each possible mode used. For the MCS table + * you can refer to the wireless wiki: + * + * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n + * + */ +static int ath9k_compute_qual(struct ieee80211_hw *hw, + struct ath_rx_status *rx_stats) +{ + int qual; + + if (conf_is_ht(&hw->conf)) + qual = rx_stats->rs_rssi * 100 / 45; + else + qual = rx_stats->rs_rssi * 100 / 35; + + /* + * rssi can be more than 45 though, anything above that + * should be considered at 100% + */ + if (qual > 100) + qual = 100; + + return qual; +} + +/* * For Decrypt or Demic errors, we only mark packet status here and always push * up the frame up to let mac80211 handle the actual error case, be it no * decryption key or real decryption error. This let us keep statistics there. @@ -247,38 +288,7 @@ static int ath_rx_prepare(struct ath_common *common, rx_status->noise = common->ani.noise_floor; rx_status->signal = ATH_DEFAULT_NOISE_FLOOR + rx_stats->rs_rssi; rx_status->antenna = rx_stats->rs_antenna; - - /* - * Theory for reporting quality: - * - * At a hardware RSSI of 45 you will be able to use MCS 7 reliably. - * At a hardware RSSI of 45 you will be able to use MCS 15 reliably. - * At a hardware RSSI of 35 you should be able use 54 Mbps reliably. - * - * MCS 7 is the highets MCS index usable by a 1-stream device. - * MCS 15 is the highest MCS index usable by a 2-stream device. - * - * All ath9k devices are either 1-stream or 2-stream. - * - * How many bars you see is derived from the qual reporting. - * - * A more elaborate scheme can be used here but it requires tables - * of SNR/throughput for each possible mode used. For the MCS table - * you can refer to the wireless wiki: - * - * http://wireless.kernel.org/en/developers/Documentation/ieee80211/802.11n - * - */ - if (conf_is_ht(&hw->conf)) - rx_status->qual = rx_stats->rs_rssi * 100 / 45; - else - rx_status->qual = rx_stats->rs_rssi * 100 / 35; - - /* rssi can be more than 45 though, anything above that - * should be considered at 100% */ - if (rx_status->qual > 100) - rx_status->qual = 100; - + rx_status->qual = ath9k_compute_qual(hw, rx_stats); rx_status->flag |= RX_FLAG_TSFT; return 1;