From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 51264D50B for ; Tue, 5 Sep 2023 15:20:54 +0000 (UTC) Received: from phobos.denx.de (phobos.denx.de [IPv6:2a01:238:438b:c500:173d:9f52:ddab:ee01]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A2660197; Tue, 5 Sep 2023 08:20:52 -0700 (PDT) Received: from wsk (85-222-111-42.dynamic.chello.pl [85.222.111.42]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: lukma@denx.de) by phobos.denx.de (Postfix) with ESMTPSA id 0C2FD86568; Tue, 5 Sep 2023 17:20:51 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=denx.de; s=phobos-20191101; t=1693927251; bh=T1uTBxVz9fEuMymC1e29HHIynA4YqjuQ7wSHalYu748=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=Cn7PT9z1pO8YaE3Aw/xl9jSafgAPJMOhMlgdKis4TD+7HfSQJ0p7YKovvyH79OhQP NZGUl1lT0Joc54/WdjvAb5S2vgUP6Eq9Otk9VebO+QmmWhhy4oNMGgoKF+PvB73ati tQkqiSQvMv72vpMDwQkPa/unrxhoAMM5giJkKLRFJI1tmswKH1up9MkDhcgmchait+ yvgwNiGmTuw3ZycAp5f98MsnXWUW+iWeEdO6vLB9HIkn3PhHv1Xu3lYMjdlO1dCXMN Ynf8K7kNR67zO9Bz8uYWBwLMvK0C9du4yQkezba9Csn2UsJjMao5EXWnSbB8uDLPJ6 U9V3bfdypv9eA== Date: Tue, 5 Sep 2023 17:20:50 +0200 From: Lukasz Majewski To: Vladimir Oltean Cc: Eric Dumazet , Andrew Lunn , davem@davemloft.net, Paolo Abeni , Woojung Huh , Tristram.Ha@microchip.com, Florian Fainelli , Jakub Kicinski , UNGLinuxDriver@microchip.com, George McCollister , Oleksij Rempel , netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v3 RFC 3/4] net: dsa: hsr: Enable in KSZ9477 switch HW HSR offloading Message-ID: <20230905172050.2834d2df@wsk> In-Reply-To: <20230905134837.dzp3yk2hjgt6hf4a@skbuf> References: <20230904120209.741207-1-lukma@denx.de> <20230904120209.741207-1-lukma@denx.de> <20230904120209.741207-4-lukma@denx.de> <20230904120209.741207-4-lukma@denx.de> <20230905103750.u3hbn6xmgthgdpnw@skbuf> <20230905131103.67f41c13@wsk> <20230905130355.7x3vpgdlmdzg6skz@skbuf> <20230905134837.dzp3yk2hjgt6hf4a@skbuf> Organization: denx.de X-Mailer: Claws Mail 3.19.0 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; boundary="Sig_/Fg0cFCxgPXtz_OmM9qIQy/n"; protocol="application/pgp-signature"; micalg=pgp-sha512 X-Virus-Scanned: clamav-milter 0.103.8 at phobos.denx.de X-Virus-Status: Clean X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_BLOCKED, SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net --Sig_/Fg0cFCxgPXtz_OmM9qIQy/n Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Hi Vladimir, > On Tue, Sep 05, 2023 at 04:03:55PM +0300, Vladimir Oltean wrote: > > > > What are the causes due to which self-address filtering and > > > > duplicate elimination only work "most of the time"? =20 > > >=20 > > > Please refer to section "KSZ9477 CHIP LIMITATIONS" in: > > > https://ww1.microchip.com/downloads/en/Appnotes/AN3474-KSZ9477-High-A= vailability-Seamless-Redundancy-Application-Note-00003474A.pdf > > > =20 > >=20 > > Ok, so the limitation is a race condition in hardware such that, > > when duplicate packets are received on member ports very close in > > time to each other, the hardware fails to detect that they're > > duplicates. =20 >=20 > It would be good to leave at least the link as part of the comment, > if not also a short summary (in case the PDF URL gets moved/removed). Ok. Best regards, Lukasz Majewski -- DENX Software Engineering GmbH, Managing Director: Erika Unter HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-59 Fax: (+49)-8142-66989-80 Email: lukma@denx.de --Sig_/Fg0cFCxgPXtz_OmM9qIQy/n Content-Type: application/pgp-signature Content-Description: OpenPGP digital signature -----BEGIN PGP SIGNATURE----- iQEzBAEBCgAdFiEEgAyFJ+N6uu6+XupJAR8vZIA0zr0FAmT3R1IACgkQAR8vZIA0 zr1iMwgAmOimDVrRtYK0fKVZ58n11pSAlMPeA5gm31LbU9V7Vw1FdlcAoMz76bAH hTH6bugjTvkpR+kCRdUmrgBDbAdeQmtuTBChCvW7puLVjAofzAP5j9HfC2OrUsYR 6SOYh8r4lWAHzsSpGwyboJK5qYaILwGBcIM2/sGr0eFplVzmCM8lD7Z6zQjKV5h1 ALP6mRH4dRxfd8/xmO1pc/XK3fe2jRHXVBz9/hlMLIohSJ2KQ+raSOPM0bdc8PVv zUlqQe16/2Z/8Krt9hV/F/uLzmbMKSg+5/YDEhOeem0aLo4r8WK66DK70wl7C+bs ba4SiVpiUZlSbtorq088jjo7CS8oAg== =1mul -----END PGP SIGNATURE----- --Sig_/Fg0cFCxgPXtz_OmM9qIQy/n--