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Sun, 8 Nov 2020 08:11:43 +0000 Subject: Re: [PATCH v3 v3] mac80211: 160MHz support per IEEE802.11ax standard To: Johannes Berg Cc: linux-wireless@vger.kernel.org, aviad.brikman@celeno.com, eliav.farber@celeno.com References: <20201019063921.4335-1-shay.bar@celeno.com> <20201019132616.32286-1-shay.bar@celeno.com> <9a043fdcf1c6324688f4c92b18f31c267969f5fc.camel@sipsolutions.net> From: Shay Bar Message-ID: <4f38e1cf-fc8c-c9fd-e064-e433a8b82186@celeno.com> Date: Sun, 8 Nov 2020 10:11:39 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.3.3 In-Reply-To: <9a043fdcf1c6324688f4c92b18f31c267969f5fc.camel@sipsolutions.net> Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Content-Language: en-US X-Originating-IP: [87.70.55.13] X-ClientProxiedBy: LO2P265CA0496.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:13a::21) To AM0P192MB0468.EURP192.PROD.OUTLOOK.COM (2603:10a6:208:45::15) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [10.0.0.13] (87.70.55.13) by LO2P265CA0496.GBRP265.PROD.OUTLOOK.COM (2603:10a6:600:13a::21) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3541.21 via Frontend Transport; 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X-MS-Exchange-AntiSpam-MessageData: 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 X-OriginatorOrg: celeno.com X-MS-Exchange-CrossTenant-Network-Message-Id: d39d9ef1-9d9e-46e1-989a-08d883bdedaa X-MS-Exchange-CrossTenant-AuthSource: AM0P192MB0468.EURP192.PROD.OUTLOOK.COM X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Nov 2020 08:11:43.3992 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: f313103b-4c9f-4fd3-b5cf-b97f91c4afa8 X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: okPL/4MEv5r2YlDT2y/5Q5dKMGI6E6f5fo7RnUogwNl1jCN4TRwUqIEiME3ZGjZtODCmVWNFRqZA5YbpSDOIvA== X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM0P192MB0434 Precedence: bulk List-ID: X-Mailing-List: linux-wireless@vger.kernel.org On 06/11/2020 12:35, Johannes Berg wrote: > External Email > > > On Mon, 2020-10-19 at 16:26 +0300, Shay Bar wrote: >> According to the new IEEE802.11ax standard center frequency of the 160MHz >> should be published in segment2 field of HT operation IE when using EXT NSS >> (when supporting smaller number of NSS in VHT in 160MHz BW). >> This patch adds the required support to mac80211, cfg80211 to parse it properly >> according to the new style as appears in the new standard. >> >> According to the new style, the AP should publish that its bw is 80MHz and not >> 160MHz. >> A STA should conclude that an AP is working in 160MHz if it publishes >> the center frequency of the 160MHz bandwidth in seg1 field of VHT operation IE >> or seg2 field of HT operation IE. > Is this referring to D6.2 Table 26-9 "Setting of the VHT Channel Width > and VHT NSS at an HE STA transmitting the OM Control subfield"? No, it is referring to IEEE P802.11-REVmd™/D5.0, September 2020 Table 9-81- "Setting of the Channel Width subfield and 160/80+80 BW subfield at a VHT STA transmitting the Operating Mode field" (where it doesn't refer to OM) The nl80211.c change is also described in the first 3 rows of Table 9-274 "VHT Operation Information subfields".