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 285DF7F0 for ; Fri, 12 May 2023 12:27:56 +0000 (UTC) Received: from esa.microchip.iphmx.com (esa.microchip.iphmx.com [68.232.154.123]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 69F54D059 for ; Fri, 12 May 2023 05:27:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=microchip.com; i=@microchip.com; q=dns/txt; s=mchp; t=1683894433; x=1715430433; h=date:from:to:cc:subject:message-id:references: mime-version:in-reply-to; bh=2gN6/ZEo7C7dYWYazAIa1eFMKtUGi5tXHCpJLLZ9MVE=; b=TQ/h9qhTlgUkgPezwJ3f7WjxPZrkFSdh+RfoC1GRPBuIBK0zi/EqdW4s ZYn/XcKSrT7MAHKcokvQxy/Qa2zWA9yTrEaO+DcDa/fI6Hk7fCpfnHlIy NtupvpqSb6x0krHFlQnmt+nOqz3uJHyzNKS7eK/Eyqg/AV/F0v6RXzXiv ERNirZ/NAsWg1t039Nis05DrhCCHeFA+7JPUB68beXN3Wiag1tuelqo2K JMkRM89FFd4LC9ya/XRKfPI3YqTnpyX9PbPuZfNRJ0ImUpZg9TP/zF2r0 DX5rIqzAaPzD82lalK8l1XP8oWnx2poRgLpTOLEdp6CQ/XLloSa+dP3ho w==; X-IronPort-AV: E=Sophos;i="5.99,269,1677567600"; d="asc'?scan'208";a="215064112" X-Amp-Result: UNKNOWN X-Amp-Original-Verdict: FILE UNKNOWN Received: from unknown (HELO email.microchip.com) ([170.129.1.10]) by esa2.microchip.iphmx.com with ESMTP/TLS/AES256-SHA256; 12 May 2023 05:24:18 -0700 Received: from chn-vm-ex04.mchp-main.com (10.10.85.152) by chn-vm-ex02.mchp-main.com (10.10.85.144) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.21; Fri, 12 May 2023 05:24:07 -0700 Received: from wendy (10.10.115.15) by chn-vm-ex04.mchp-main.com (10.10.85.152) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.21 via Frontend Transport; Fri, 12 May 2023 05:24:05 -0700 Date: Fri, 12 May 2023 13:23:45 +0100 From: Conor Dooley To: CC: , , , , , , Subject: Re: [PATCH v4 1/1] net: macb: Shorten max_tx_len to 4KiB - 56 on mpfs Message-ID: <20230512-strive-stump-12d1eae2ba61@wendy> References: <20230512122032.2902335-1-daire.mcnamara@microchip.com> <20230512122032.2902335-2-daire.mcnamara@microchip.com> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="OI5v1stjB8dod2GQ" Content-Disposition: inline In-Reply-To: <20230512122032.2902335-2-daire.mcnamara@microchip.com> X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED, RCVD_IN_MSPIKE_H2,SPF_HELO_PASS,SPF_NONE,T_SCC_BODY_TEXT_LINE, URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net --OI5v1stjB8dod2GQ Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Fri, May 12, 2023 at 01:20:32PM +0100, daire.mcnamara@microchip.com wrot= e: > From: Daire McNamara >=20 > On mpfs, with SRAM configured for 4 queues, setting max_tx_len > to GEM_TX_MAX_LEN=3D0x3f0 results multiple AMBA errors. > Setting max_tx_len to (4KiB - 56) removes those errors. >=20 > The details are described in erratum 1686 by Cadence >=20 > The max jumbo frame size is also reduced for mpfs to (4KiB - 56). >=20 > Signed-off-by: Daire McNamara Reviewed-by: Conor Dooley Thanks, Conor. --OI5v1stjB8dod2GQ Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYIAB0WIQRh246EGq/8RLhDjO14tDGHoIJi0gUCZF4v0QAKCRB4tDGHoIJi 0oWKAQC2KWqsF5EQy81o/HHoeY7iRxTxWosUjvhbfh45kz1Z8QEAoW3p0ew0SO6H +HMAkaIUCTBQ02QdtWOnFsIlWxArQgM= =dWjo -----END PGP SIGNATURE----- --OI5v1stjB8dod2GQ--