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[2604:1380:4601:e00::3]) by mx.google.com with ESMTPS id js21-20020a17090797d500b00a521fee9556si4367714ejc.970.2024.04.15.05.18.32 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 15 Apr 2024 05:18:32 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel+bounces-145050-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) client-ip=2604:1380:4601:e00::3; Authentication-Results: mx.google.com; arc=pass (i=1 spf=pass spfdomain=bp.renesas.com dmarc=pass fromdomain=bp.renesas.com); spf=pass (google.com: domain of linux-kernel+bounces-145050-linux.lists.archive=gmail.com@vger.kernel.org designates 2604:1380:4601:e00::3 as permitted sender) smtp.mailfrom="linux-kernel+bounces-145050-linux.lists.archive=gmail.com@vger.kernel.org"; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=renesas.com Received: from smtp.subspace.kernel.org (wormhole.subspace.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by am.mirrors.kernel.org (Postfix) with ESMTPS id C24AF1F23C4C for ; Mon, 15 Apr 2024 12:18:31 +0000 (UTC) Received: from localhost.localdomain (localhost.localdomain [127.0.0.1]) by smtp.subspace.kernel.org (Postfix) with ESMTP id 4414A6AF88; Mon, 15 Apr 2024 12:18:18 +0000 (UTC) Received: from relmlie6.idc.renesas.com (relmlor2.renesas.com [210.160.252.172]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C7111374D3; Mon, 15 Apr 2024 12:18:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=210.160.252.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713183497; cv=none; b=jys/fksxeQUsaUyb0zY0NUWaDcE6mtymEHBCQJQmULAhV5DBDgpQ/mv4Y9+7u4eRarGAOfKlIMe8FXdcV0S7lI4BCWr3UkuM8PWZyC+0iwTntm0tDWPg1wVqR0x6JJULnNcCbegiAtDrith6pOOvEm5IgzHDuemMvK4hjBFSEu4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1713183497; c=relaxed/simple; bh=XqA2LV/Vgj6hO2qfNwHJuH7SArud/hAYbSJnEWlJaT4=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=kTuAae/t4P0XqQyDDxdtQBCueghKGItTTWYnv42rMoZaTb4g5PZioi6XrMHYCaBtv6x8gjGDxLRTFrkSCRTyhOGzSYuKUe7s6JINxCeZsotnOhq/bEDSNT/NRjDGdVlcBbh8YAFkmTRmmq7XDPbV6HTV0QJAb/6A++WiG2Dv9Rs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=bp.renesas.com; spf=pass smtp.mailfrom=bp.renesas.com; arc=none smtp.client-ip=210.160.252.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=bp.renesas.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=bp.renesas.com X-IronPort-AV: E=Sophos;i="6.07,203,1708354800"; d="asc'?scan'208";a="205445324" Received: from unknown (HELO relmlir5.idc.renesas.com) ([10.200.68.151]) by relmlie6.idc.renesas.com with ESMTP; 15 Apr 2024 21:18:13 +0900 Received: from [10.226.93.74] (unknown [10.226.93.74]) by relmlir5.idc.renesas.com (Postfix) with ESMTP id 17D01400BBFF; Mon, 15 Apr 2024 21:18:09 +0900 (JST) Message-ID: Date: Mon, 15 Apr 2024 13:18:08 +0100 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [net-next RFC v3 3/7] net: ravb: Refactor RX ring refill Content-Language: en-GB To: =?UTF-8?Q?Niklas_S=C3=B6derlund?= Cc: Sergey Shtylyov , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Geert Uytterhoeven , netdev@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org References: <20240415094804.8016-1-paul.barker.ct@bp.renesas.com> <20240415094804.8016-4-paul.barker.ct@bp.renesas.com> <20240415115755.GH3156415@ragnatech.se> From: Paul Barker Organization: Renesas Electronics Corporation In-Reply-To: <20240415115755.GH3156415@ragnatech.se> Content-Type: multipart/signed; micalg=pgp-sha256; protocol="application/pgp-signature"; boundary="------------fQkLkeakaNyqS60iLBC7JGay" This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --------------fQkLkeakaNyqS60iLBC7JGay Content-Type: multipart/mixed; boundary="------------yyWBol9nIQgOP00BSCcuE6Ee"; protected-headers="v1" From: Paul Barker To: =?UTF-8?Q?Niklas_S=C3=B6derlund?= Cc: Sergey Shtylyov , "David S. Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Geert Uytterhoeven , netdev@vger.kernel.org, linux-renesas-soc@vger.kernel.org, linux-kernel@vger.kernel.org Message-ID: Subject: Re: [net-next RFC v3 3/7] net: ravb: Refactor RX ring refill References: <20240415094804.8016-1-paul.barker.ct@bp.renesas.com> <20240415094804.8016-4-paul.barker.ct@bp.renesas.com> <20240415115755.GH3156415@ragnatech.se> In-Reply-To: <20240415115755.GH3156415@ragnatech.se> --------------yyWBol9nIQgOP00BSCcuE6Ee Content-Type: multipart/mixed; boundary="------------23fTz8Sve8qVuAJGjspuhLgn" --------------23fTz8Sve8qVuAJGjspuhLgn Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On 15/04/2024 12:57, Niklas S=C3=B6derlund wrote: > Hi Paul, >=20 > Thanks for your work, I really like this deduplication of code! >=20 > On 2024-04-15 10:48:00 +0100, Paul Barker wrote: >> To reduce code duplication, we add a new RX ring refill function which= >> can handle both the initial RX ring population (which was split betwee= n >> ravb_ring_init() and ravb_ring_format()) and the RX ring refill after >> polling (in ravb_rx()). >> >> Signed-off-by: Paul Barker >> --- >> drivers/net/ethernet/renesas/ravb_main.c | 141 +++++++++-------------= - >> 1 file changed, 52 insertions(+), 89 deletions(-) >> >> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/et= hernet/renesas/ravb_main.c >> index 1ac599a044b2..baa01bd81f2d 100644 >> --- a/drivers/net/ethernet/renesas/ravb_main.c >> +++ b/drivers/net/ethernet/renesas/ravb_main.c >> @@ -317,35 +317,42 @@ static void ravb_ring_free(struct net_device *nd= ev, int q) >> priv->tx_skb[q] =3D NULL; >> } >> =20 >> -static void ravb_rx_ring_format(struct net_device *ndev, int q) >> +static u32 >> +ravb_rx_ring_refill(struct net_device *ndev, int q, u32 count, gfp_t = gfp_mask) >> { >> struct ravb_private *priv =3D netdev_priv(ndev); >> + const struct ravb_hw_info *info =3D priv->info; >> struct ravb_rx_desc *rx_desc; >> - unsigned int rx_ring_size; >> dma_addr_t dma_addr; >> - unsigned int i; >> + u32 i, entry; >> =20 >> - rx_ring_size =3D priv->info->rx_desc_size * priv->num_rx_ring[q]; >> - memset(priv->rx_ring[q].raw, 0, rx_ring_size); >> - /* Build RX ring buffer */ >> - for (i =3D 0; i < priv->num_rx_ring[q]; i++) { >> - /* RX descriptor */ >> - rx_desc =3D ravb_rx_get_desc(priv, q, i); >> - rx_desc->ds_cc =3D cpu_to_le16(priv->info->rx_max_desc_use); >> - dma_addr =3D dma_map_single(ndev->dev.parent, priv->rx_skb[q][i]->d= ata, >> - priv->info->rx_max_frame_size, >> - DMA_FROM_DEVICE); >> - /* We just set the data size to 0 for a failed mapping which >> - * should prevent DMA from happening... >> - */ >> - if (dma_mapping_error(ndev->dev.parent, dma_addr)) >> - rx_desc->ds_cc =3D cpu_to_le16(0); >> - rx_desc->dptr =3D cpu_to_le32(dma_addr); >> + for (i =3D 0; i < count; i++) { >> + entry =3D (priv->dirty_rx[q] + i) % priv->num_rx_ring[q]; >> + rx_desc =3D ravb_rx_get_desc(priv, q, entry); >> + rx_desc->ds_cc =3D cpu_to_le16(info->rx_max_desc_use); >> + >> + if (!priv->rx_skb[q][entry]) { >> + priv->rx_skb[q][entry] =3D ravb_alloc_skb(ndev, info, gfp_mask); >> + if (!priv->rx_skb[q][entry]) >> + break; >> + dma_addr =3D dma_map_single(ndev->dev.parent, >> + priv->rx_skb[q][entry]->data, >> + priv->info->rx_max_frame_size, >> + DMA_FROM_DEVICE); >> + skb_checksum_none_assert(priv->rx_skb[q][entry]); >> + /* We just set the data size to 0 for a failed mapping >> + * which should prevent DMA from happening... >> + */ >> + if (dma_mapping_error(ndev->dev.parent, dma_addr)) >> + rx_desc->ds_cc =3D cpu_to_le16(0); >> + rx_desc->dptr =3D cpu_to_le32(dma_addr); >> + } >> + /* Descriptor type must be set after all the above writes */ >> + dma_wmb(); >> rx_desc->die_dt =3D DT_FEMPTY; >> } >> - rx_desc =3D ravb_rx_get_desc(priv, q, i); >> - rx_desc->dptr =3D cpu_to_le32((u32)priv->rx_desc_dma[q]); >> - rx_desc->die_dt =3D DT_LINKFIX; /* type */ >> + >> + return i; >> } >> =20 >> /* Format skb and descriptor buffer for Ethernet AVB */ >> @@ -353,6 +360,7 @@ static void ravb_ring_format(struct net_device *nd= ev, int q) >> { >> struct ravb_private *priv =3D netdev_priv(ndev); >> unsigned int num_tx_desc =3D priv->num_tx_desc; >> + struct ravb_rx_desc *rx_desc; >> struct ravb_tx_desc *tx_desc; >> struct ravb_desc *desc; >> unsigned int tx_ring_size =3D sizeof(*tx_desc) * priv->num_tx_ring[q= ] * >> @@ -364,8 +372,6 @@ static void ravb_ring_format(struct net_device *nd= ev, int q) >> priv->dirty_rx[q] =3D 0; >> priv->dirty_tx[q] =3D 0; >> =20 >> - ravb_rx_ring_format(ndev, q); >> - >> memset(priv->tx_ring[q], 0, tx_ring_size); >> /* Build TX ring buffer */ >> for (i =3D 0, tx_desc =3D priv->tx_ring[q]; i < priv->num_tx_ring[q]= ; >> @@ -379,6 +385,14 @@ static void ravb_ring_format(struct net_device *n= dev, int q) >> tx_desc->dptr =3D cpu_to_le32((u32)priv->tx_desc_dma[q]); >> tx_desc->die_dt =3D DT_LINKFIX; /* type */ >> =20 >> + /* Regular RX descriptors have already been initialized by >> + * ravb_rx_ring_refill(), we just need to initialize the final link >> + * descriptor. >> + */ >> + rx_desc =3D ravb_rx_get_desc(priv, q, priv->num_rx_ring[q]); >> + rx_desc->dptr =3D cpu_to_le32((u32)priv->rx_desc_dma[q]); >> + rx_desc->die_dt =3D DT_LINKFIX; /* type */ >> + >=20 > super-nit: Should you not move this addition up to where you removed th= e=20 > call to ravb_rx_ring_format()? Before this change the order of things=20 > are, >=20 > /* Init RX ring */ > /* Init TX ring */ > /* Set RX descriptor base address */ > /* Set TX descriptor base address */ >=20 >=20 > While after it is, >=20 > /* Init TX ring */ > /* Init RX ring */ > /* Set RX descriptor base address */ > /* Set TX descriptor base address */ >=20 > My OCD is itching ;-) Since I'll need to re-spin this series anyway, I may as well tidy that up :) >=20 >> /* RX descriptor base address for best effort */ >> desc =3D &priv->desc_bat[RX_QUEUE_OFFSET + q]; >> desc->die_dt =3D DT_LINKFIX; /* type */ >> @@ -408,11 +422,9 @@ static void *ravb_alloc_rx_desc(struct net_device= *ndev, int q) >> static int ravb_ring_init(struct net_device *ndev, int q) >> { >> struct ravb_private *priv =3D netdev_priv(ndev); >> - const struct ravb_hw_info *info =3D priv->info; >> unsigned int num_tx_desc =3D priv->num_tx_desc; >> unsigned int ring_size; >> - struct sk_buff *skb; >> - unsigned int i; >> + u32 num_filled; >> =20 >> /* Allocate RX and TX skb rings */ >> priv->rx_skb[q] =3D kcalloc(priv->num_rx_ring[q], >> @@ -422,13 +434,6 @@ static int ravb_ring_init(struct net_device *ndev= , int q) >> if (!priv->rx_skb[q] || !priv->tx_skb[q]) >> goto error; >> =20 >> - for (i =3D 0; i < priv->num_rx_ring[q]; i++) { >> - skb =3D ravb_alloc_skb(ndev, info, GFP_KERNEL); >> - if (!skb) >> - goto error; >> - priv->rx_skb[q][i] =3D skb; >> - } >> - >> if (num_tx_desc > 1) { >> /* Allocate rings for the aligned buffers */ >> priv->tx_align[q] =3D kmalloc(DPTR_ALIGN * priv->num_tx_ring[q] + >> @@ -443,6 +448,13 @@ static int ravb_ring_init(struct net_device *ndev= , int q) >> =20 >> priv->dirty_rx[q] =3D 0; >> =20 >> + /* Populate RX ring buffer. */ >> + ring_size =3D priv->info->rx_desc_size * priv->num_rx_ring[q]; >> + memset(priv->rx_ring[q].raw, 0, ring_size); >> + num_filled =3D ravb_rx_ring_refill(ndev, q, priv->num_rx_ring[q], GF= P_KERNEL); >> + if (num_filled !=3D priv->num_rx_ring[q]) >> + goto error; >> + >=20 > Here you also change the order, but it make sense here as you first dea= l=20 > with all TX and then all RX ;-) The placement here is because we can't call ravb_rx_ring_refill() until priv->dirty_rx[q] has been zero'd. The init order right now is actually: RX page pool RX buffers TX SKBs RX descriptors RX ring buffer TX descriptors So maybe this should be re-ordered. I considered breaking this all apart, so ravb_ring_init() would call ravb_rx_ring_init()/ravb_tx_ring_init() and ravb_ring_format() would call ravb_rx_ring_format()/ravb_tx_ring_format(). There are several steps happening for TX & RX in both init and format stages. Does that sound cleaner to you? 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