From nobody Sat Apr 18 15:43:39 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 68453C43334 for ; Tue, 12 Jul 2022 18:15:19 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233038AbiGLSPR (ORCPT ); Tue, 12 Jul 2022 14:15:17 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41200 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229757AbiGLSPQ (ORCPT ); Tue, 12 Jul 2022 14:15:16 -0400 Received: from mx3.wp.pl (mx3.wp.pl [212.77.101.9]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7E98ABD3AE for ; Tue, 12 Jul 2022 11:15:09 -0700 (PDT) Received: (wp-smtpd smtp.wp.pl 27443 invoked from network); 12 Jul 2022 20:15:02 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=wp.pl; s=1024a; t=1657649702; bh=zGkagB45h+s+I2oFUucK24FU3BjdVGg3GYTCxnIGezE=; h=From:To:Cc:Subject; b=o1bet5Hjnn0aqq3Wf0z/ZH3HXfE2Xj+pzqtyjG//4/exfms6yV4A/mFZeVOizex9r RBT8l+GrjExUMdUclzFxj73DxMrOfT55ho8/8RN4qQbwBZhmpwRL/jiLH53QFuRUq6 B00mNhoVkFxJ7u83uqz5EO0+DtmtDA2oH75jYcFs= Received: from ip-137-21.ds.pw.edu.pl (HELO LAPTOP-OLEK.lan) (olek2@wp.pl@[194.29.137.21]) (envelope-sender ) by smtp.wp.pl (WP-SMTPD) with ECDHE-RSA-AES256-GCM-SHA384 encrypted SMTP for ; 12 Jul 2022 20:15:02 +0200 From: Aleksander Jan Bajkowski To: hauke@hauke-m.de, davem@davemloft.net, edumazet@google.com, kuba@kernel.org, pabeni@redhat.com, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Cc: Aleksander Jan Bajkowski Subject: [PATCH net-next] net: lantiq_xrx200: use skb cache Date: Tue, 12 Jul 2022 20:14:56 +0200 Message-Id: <20220712181456.3398-1-olek2@wp.pl> X-Mailer: git-send-email 2.30.2 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-WP-DKIM-Status: good (id: wp.pl) X-WP-MailID: b2a8cc528473dba19639df9c4c0d0321 X-WP-AV: skaner antywirusowy Poczty Wirtualnej Polski X-WP-SPAM: NO 0000000 [YZP0] Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" napi_build_skb() reuses NAPI skbuff_head cache in order to save some cycles on freeing/allocating skbuff_heads on every new Rx or completed Tx. Use napi_consume_skb() to feed the cache with skbuff_heads of completed Tx. The budget parameter is added to indicate NAPI context, as a value of zero can be passed in the case of netpoll. NAT performance results on BT Home Hub 5A (kernel 5.15.45, mtu 1500): Fast path (Software Flow Offload): Up Down Before 702.4 719.3 After 707.3 739.9 Slow path: Up Down Before 91.8 184.1 After 92.0 185.7 Signed-off-by: Aleksander Jan Bajkowski Acked-by: Hauke Mehrtens --- drivers/net/ethernet/lantiq_xrx200.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/net/ethernet/lantiq_xrx200.c b/drivers/net/ethernet/la= ntiq_xrx200.c index 5edb68a8aab1..83e07404803f 100644 --- a/drivers/net/ethernet/lantiq_xrx200.c +++ b/drivers/net/ethernet/lantiq_xrx200.c @@ -238,7 +238,7 @@ static int xrx200_hw_receive(struct xrx200_chan *ch) return ret; } =20 - skb =3D build_skb(buf, priv->rx_skb_size); + skb =3D napi_build_skb(buf, priv->rx_skb_size); skb_reserve(skb, NET_SKB_PAD); skb_put(skb, len); =20 @@ -321,7 +321,7 @@ static int xrx200_tx_housekeeping(struct napi_struct *n= api, int budget) pkts++; bytes +=3D skb->len; ch->skb[ch->tx_free] =3D NULL; - consume_skb(skb); + napi_consume_skb(skb, budget); memset(&ch->dma.desc_base[ch->tx_free], 0, sizeof(struct ltq_dma_desc)); ch->tx_free++; --=20 2.30.2