From patchwork Wed Dec 9 08:37:43 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Giuseppe CAVALLARO X-Patchwork-Id: 554286 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 C48BA14030F for ; Wed, 9 Dec 2015 19:29:37 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753267AbbLII32 (ORCPT ); Wed, 9 Dec 2015 03:29:28 -0500 Received: from mx07-00178001.pphosted.com ([62.209.51.94]:1923 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753370AbbLII2T (ORCPT ); Wed, 9 Dec 2015 03:28:19 -0500 Received: from pps.filterd (m0046668.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.14.5/8.14.5) with SMTP id tB98DTCc023456 for ; Wed, 9 Dec 2015 09:28:18 +0100 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 1yndrgrxpv-1 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NOT) for ; Wed, 09 Dec 2015 09:28:18 +0100 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 22AD13F for ; Wed, 9 Dec 2015 08:27:41 +0000 (GMT) Received: from Webmail-eu.st.com (Safex1hubcas21.st.com [10.75.90.44]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id C64194F15 for ; Wed, 9 Dec 2015 08:28:15 +0000 (GMT) Received: from localhost (164.130.129.175) by Webmail-ga.st.com (10.75.90.48) with Microsoft SMTP Server (TLS) id 14.3.235.1; Wed, 9 Dec 2015 09:28:15 +0100 From: Giuseppe Cavallaro To: CC: , Giuseppe Cavallaro , Fabrice Gasnier Subject: [PATCH (net-next.git) 07/18] stmmac: add is_jumbo field to dma data Date: Wed, 9 Dec 2015 09:37:43 +0100 Message-ID: <1449650274-14896-8-git-send-email-peppe.cavallaro@st.com> X-Mailer: git-send-email 1.7.4.4 In-Reply-To: <1449650274-14896-1-git-send-email-peppe.cavallaro@st.com> References: <1449650274-14896-1-git-send-email-peppe.cavallaro@st.com> MIME-Version: 1.0 X-Originating-IP: [164.130.129.175] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:5.15.21, 1.0.33, 0.0.0000 definitions=2015-12-09_05:2015-12-08, 2015-12-09, 1970-01-01 signatures=0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Optimize tx_clean by avoiding a des3 read in stmmac_clean_desc3(). In ring mode, TX, des3 seems only used when xmit a jumbo frame. In case of normal descriptors, it may also be used for time stamping. Clean it in the above two case, without reading it. Signed-off-by: Fabrice Gasnier Signed-off-by: Giuseppe Cavallaro --- drivers/net/ethernet/stmicro/stmmac/chain_mode.c | 3 ++- drivers/net/ethernet/stmicro/stmmac/ring_mode.c | 11 ++++++++++- drivers/net/ethernet/stmicro/stmmac/stmmac.h | 1 + drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 1 + 4 files changed, 14 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/stmicro/stmmac/chain_mode.c b/drivers/net/ethernet/stmicro/stmmac/chain_mode.c index e985459..d6d56ee 100644 --- a/drivers/net/ethernet/stmicro/stmmac/chain_mode.c +++ b/drivers/net/ethernet/stmicro/stmmac/chain_mode.c @@ -154,7 +154,8 @@ static void stmmac_clean_desc3(void *priv_ptr, struct dma_desc *p) struct stmmac_priv *priv = (struct stmmac_priv *)priv_ptr; unsigned int entry = priv->dirty_tx; - if (priv->tx_skbuff_dma[entry].last_segment && !priv->extend_desc) + if (priv->tx_skbuff_dma[entry].last_segment && !priv->extend_desc && + priv->hwts_tx_en) /* NOTE: Device will overwrite des3 with timestamp value if * 1588-2002 time stamping is enabled, hence reinitialize it * to keep explicit chaining in the descriptor. diff --git a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c index 3300029..ffab4d7 100644 --- a/drivers/net/ethernet/stmicro/stmmac/ring_mode.c +++ b/drivers/net/ethernet/stmicro/stmmac/ring_mode.c @@ -58,6 +58,7 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum) priv->tx_skbuff_dma[entry].buf = desc->des2; priv->tx_skbuff_dma[entry].len = bmax; + priv->tx_skbuff_dma[entry].is_jumbo = true; desc->des3 = desc->des2 + BUF_SIZE_4KiB; priv->hw->desc->prepare_tx_desc(desc, 1, bmax, csum, @@ -78,6 +79,7 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum) return -1; priv->tx_skbuff_dma[entry].buf = desc->des2; priv->tx_skbuff_dma[entry].len = len; + priv->tx_skbuff_dma[entry].is_jumbo = true; desc->des3 = desc->des2 + BUF_SIZE_4KiB; priv->hw->desc->prepare_tx_desc(desc, 0, len, csum, @@ -91,6 +93,7 @@ static int stmmac_jumbo_frm(void *p, struct sk_buff *skb, int csum) return -1; priv->tx_skbuff_dma[entry].buf = desc->des2; priv->tx_skbuff_dma[entry].len = nopaged_len; + priv->tx_skbuff_dma[entry].is_jumbo = true; desc->des3 = desc->des2 + BUF_SIZE_4KiB; priv->hw->desc->prepare_tx_desc(desc, 1, nopaged_len, csum, STMMAC_RING_MODE); @@ -128,7 +131,13 @@ static void stmmac_init_desc3(struct dma_desc *p) static void stmmac_clean_desc3(void *priv_ptr, struct dma_desc *p) { - if (unlikely(p->des3)) + struct stmmac_priv *priv = (struct stmmac_priv *)priv_ptr; + unsigned int entry = priv->dirty_tx; + + /* des3 is only used for jumbo frames tx or time stamping */ + if (unlikely(priv->tx_skbuff_dma[entry].is_jumbo || + (priv->tx_skbuff_dma[entry].last_segment && + !priv->extend_desc && priv->hwts_tx_en))) p->des3 = 0; } diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac.h b/drivers/net/ethernet/stmicro/stmmac/stmmac.h index f15c493..b73e8d8 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac.h +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac.h @@ -47,6 +47,7 @@ struct stmmac_tx_info { bool map_as_page; unsigned len; bool last_segment; + bool is_jumbo; }; struct stmmac_priv { diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index 3136c0b..073a929 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -1381,6 +1381,7 @@ static void stmmac_tx_clean(struct stmmac_priv *priv) } priv->hw->mode->clean_desc3(priv, p); priv->tx_skbuff_dma[entry].last_segment = false; + priv->tx_skbuff_dma[entry].is_jumbo = false; if (likely(skb != NULL)) { pkts_compl++;