From patchwork Sun Apr 12 21:38:28 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Felix Fietkau X-Patchwork-Id: 460565 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 5F6CE1402F4 for ; Mon, 13 Apr 2015 07:38:41 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752664AbbDLVig (ORCPT ); Sun, 12 Apr 2015 17:38:36 -0400 Received: from static.88-198-24-112.clients.your-server.de ([88.198.24.112]:48607 "EHLO nbd.name" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752152AbbDLVif (ORCPT ); Sun, 12 Apr 2015 17:38:35 -0400 Received: by nf.lan (Postfix, from userid 501) id 6E802DAB928F; Sun, 12 Apr 2015 23:38:31 +0200 (CEST) From: Felix Fietkau To: netdev@vger.kernel.org Cc: zajec5@gmail.com, hauke@hauke-m.de, eric.dumazet@gmail.com Subject: [PATCH v3 6/9] bgmac: increase rx ring size from 511 to 512 Date: Sun, 12 Apr 2015 23:38:28 +0200 Message-Id: <1428874711-23950-6-git-send-email-nbd@openwrt.org> X-Mailer: git-send-email 2.2.2 In-Reply-To: <1428874711-23950-1-git-send-email-nbd@openwrt.org> References: <1428874711-23950-1-git-send-email-nbd@openwrt.org> Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Limiting it to 511 looks like a failed attempt at leaving one descriptor empty to allow the hardware to stop processing a buffer that has not been prepared yet. However, this doesn't work because this affects the total ring size as well Signed-off-by: Felix Fietkau --- drivers/net/ethernet/broadcom/bgmac.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/net/ethernet/broadcom/bgmac.h b/drivers/net/ethernet/broadcom/bgmac.h index 3db0d52..e45e303 100644 --- a/drivers/net/ethernet/broadcom/bgmac.h +++ b/drivers/net/ethernet/broadcom/bgmac.h @@ -356,7 +356,7 @@ #define BGMAC_MAX_RX_RINGS 1 #define BGMAC_TX_RING_SLOTS 128 -#define BGMAC_RX_RING_SLOTS 512 - 1 /* Why -1? Well, Broadcom does that... */ +#define BGMAC_RX_RING_SLOTS 512 #define BGMAC_RX_HEADER_LEN 28 /* Last 24 bytes are unused. Well... */ #define BGMAC_RX_FRAME_OFFSET 30 /* There are 2 unused bytes between header and real data */