From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rafa Corvillo Subject: Re: [ISSUE: sky2 - rx error] Link stops working under heavy traffic load connected to a mv88e6176 Date: Tue, 16 May 2017 15:09:17 +0200 Message-ID: <591AF9FD.1000304@aoifes.com> References: <58F9FD64.80506@aoifes.com> <20170425082741.59428876@xeon-e3> <5901DE9F.1070005@aoifes.com> <20170427130450.GL17172@lunn.ch> <59032D8B.1010801@aoifes.com> <20170428122259.GH13231@lunn.ch> <59105EA3.9030203@aoifes.com> <20170508123852.GI27709@lunn.ch> <591AD990.901@aoifes.com> <20170516124759.GB27959@lunn.ch> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 7bit Cc: Stephen Hemminger , netdev@vger.kernel.org To: Andrew Lunn Return-path: Received: from smtp-relay-00-8.dondominio.net ([31.214.176.21]:32970 "EHLO smtp-relay-00-8.dondominio.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752250AbdEPNJW (ORCPT ); Tue, 16 May 2017 09:09:22 -0400 In-Reply-To: <20170516124759.GB27959@lunn.ch> Sender: netdev-owner@vger.kernel.org List-ID: >> Adding 8 bytes (sky2->netdev->mtu + ETH_HLEN + VLAN_HLEN + 8 >> (EDSA_HLEN)) does not fix the error, because the interface keep >> having a maximum length of 1518 bytes (sky2->netdev->mtu + ETH_HLEN >> + VLAN_HLEN). > > Did you check the value being written to here: > > /* > * The receiver hangs if it receives frames larger than the > * packet buffer. As a workaround, truncate oversize frames, but > * the register is limited to 9 bits, so if you do frames > 2052 > * you better get the MTU right! > */ > thresh = sky2_get_rx_threshold(sky2); > if (thresh > 0x1ff) > sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T), RX_TRUNC_OFF); > else { > sky2_write16(hw, SK_REG(sky2->port, RX_GMF_TR_THR), thresh); > sky2_write32(hw, SK_REG(sky2->port, RX_GMF_CTRL_T), RX_TRUNC_ON); > } > > > What is thresh? The value of thresh is 380. Rafa > > Andrew >