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Tue, 26 May 2020 22:42:38 GMT Received: by smtp.codeaurora.org (Postfix, from userid 1001) id D1FAEC43387; Tue, 26 May 2020 22:42:37 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-caf-mail-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-1.0 required=2.0 tests=ALL_TRUSTED,SPF_NONE autolearn=ham autolearn_force=no version=3.4.0 Received: from pradeepc2-linux.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: pradeepc) by smtp.codeaurora.org (Postfix) with ESMTPSA id 7DD74C433C9; Tue, 26 May 2020 22:42:36 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 7DD74C433C9 Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: aws-us-west-2-caf-mail-1.web.codeaurora.org; spf=none smtp.mailfrom=pradeepc@codeaurora.org From: Pradeep Kumar Chitrapu To: Johannes Berg , ath11k@lists.infradead.org Subject: [PATCH v3 1/9] cfg80211: Add helper function to identify 6GHz PSC channel Date: Tue, 26 May 2020 15:42:09 -0700 Message-Id: <20200526224217.11119-2-pradeepc@codeaurora.org> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200526224217.11119-1-pradeepc@codeaurora.org> References: <20200526224217.11119-1-pradeepc@codeaurora.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200526_154240_402006_E4991AB5 X-CRM114-Status: GOOD ( 11.52 ) X-Spam-Score: 0.0 (/) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (0.0 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no trust [69.72.43.7 listed in list.dnswl.org] 0.0 RCVD_IN_MSPIKE_H3 RBL: Good reputation (+3) [69.72.43.7 listed in wl.mailspike.net] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid 0.0 RCVD_IN_MSPIKE_WL Mailspike good senders X-BeenThere: ath11k@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Pradeep Kumar Chitrapu , linux-wireless@vger.kernel.org Sender: "ath11k" Errors-To: ath11k-bounces+patchwork-ath11k=patchwork.kernel.org@lists.infradead.org 6GHz channels are divided into preferred scanning channels(PSC) and non-PSC channels. One in every four 20MHz channels is a PSC. Spec mandates to use only PSC channels as primary channels for setting up BSS on 6GHz only AP. The set of 20 MHz channels in the 6 GHz band, with channel center frequency, ch_a = Channel starting frequency – 55 + 80 × n (MHz) are referred to as preferred scanning channels (PSCs) where, n = 1, …, 15 as per IEEE P802.11ax/D6.1. This function can be used by drivers or cfg80211 when making scanning decision on 6GHz channels. Signed-off-by: Pradeep Kumar Chitrapu --- v3: - update channel starting frequency from 5945 to 5950 as per IEEE P802.11ax/D6.1 - Define helper function and remove cahnnel flag PSC include/net/cfg80211.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/include/net/cfg80211.h b/include/net/cfg80211.h index fd6a973b1249..bd27020ea8c9 100644 --- a/include/net/cfg80211.h +++ b/include/net/cfg80211.h @@ -5281,6 +5281,30 @@ ieee80211_get_channel(struct wiphy *wiphy, int freq) return ieee80211_get_channel_khz(wiphy, MHZ_TO_KHZ(freq)); } +/** + * ieee80211_is_channel_psc - is 6ghz channel a Preferred Scanning Channel (PSC) + * + * @chan: struct ieee80211_channel to determine + * Return: True if 6ghz channel is a PSC channel. False for the rest. + */ +static inline bool ieee80211_is_channel_psc(struct ieee80211_channel *chan) +{ + if (chan->band != NL80211_BAND_6GHZ) + return false; + + /* + * From IEEE P802.11ax/D6.1: The set of 20 MHz channels in the 6 GHz + * band, with channel center frequency, ch_a = Channel starting + * frequency – 55 80 × n (MHz) are referred to as preferred scanning + * channels (PSCs). Channel starting frequency is defined in 27.3.23.2 + * (Channel allocation in the 6 GHz band), and n = 1, …, 15. + */ + if (!(((chan->center_freq - 5950 + 55) >> 4) % 5)) + return true; + + return false; +} + /** * ieee80211_get_response_rate - get basic rate for a given rate *