From nobody Sat Feb 7 08:07:47 2026 Received: from mout-p-201.mailbox.org (mout-p-201.mailbox.org [80.241.56.171]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 7D6D039A7F3; Wed, 4 Feb 2026 23:22:23 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=80.241.56.171 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770247343; cv=none; b=hzzL6VizcN71bCpaVeeLzVW/TMDQehyFPuSlSBBBZNHN/3f9nfHAhWApdt2NFBu/JjOF0sQMmV6ndkZ+NzoF5YBzhbqPlww+PwaR5LmEn5HHwdBvI8RiEjyzZwhI3Daygh/jWmlaN9eanPAs7gH8km5I7HHNHSpMcBLSrFgW1pY= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770247343; c=relaxed/simple; bh=3IIW+m/ksEl4ryoxqU9MOS9jyZf9bHkRhbs1FBUg/Rc=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=IHMJ1wL6+sVubzPvjDhbKqvR9nvk+nCA417orpPSqqEJnOkFvIHwb0OwbeuTMPbaVftP90m+R1zhcFwKAQZbgiwpHK4CL1VoCqENBa/NA6c35XTO3PqAvQ924qMpFEV2Gsnn7xfghxoXsVDNnLTkK891j0PBDamvQKXQ7dmHnUs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=mailbox.org; spf=pass smtp.mailfrom=mailbox.org; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b=oc7177yj; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b=sZThBjE8; arc=none smtp.client-ip=80.241.56.171 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=mailbox.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=mailbox.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b="oc7177yj"; dkim=pass (2048-bit key) header.d=mailbox.org header.i=@mailbox.org header.b="sZThBjE8" Received: from smtp1.mailbox.org (smtp1.mailbox.org [10.196.197.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (No client certificate requested) by mout-p-201.mailbox.org (Postfix) with ESMTPS id 4f5xG562LFz9th0; Thu, 5 Feb 2026 00:22:21 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org; s=mail20150812; t=1770247341; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=itW1FyUB8h6k7+09zTJ1SECAQLv4YsVGdyRI0o2fSoA=; b=oc7177yjXASVeTD9Oc0yM5wV5CuuqSNJ3rGDb9uZtslqhvUGYNGkhWEcUTtvz1v7HQ8tqG ts1IWUiHwJd0waRhlCDHS6e8Wr4rvjcmpT5y5RLiyQBHmM+KloRrWA5eUFkwqvoxqKYw3G ijrOH4UHWOECrTk13MsFJlGsvwxgA3xpGTtpf5u8uhj8x5TFYbqpkDwy3+vTj+814DVRG9 o+WGZOUYE9ioYxrtmhlFT7qFkZ+pKJ0f5D7yTgjzjn2+fD6Y6CDji7AFM8YRrG1uEfDgi9 RfI87+nsepFzy14G5PV7fgJLw5CbQyBpZmcrzbcbufdHVSkbulKJOCkdEhUu+A== From: Lukasz Majewski DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=mailbox.org; s=mail20150812; t=1770247340; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=itW1FyUB8h6k7+09zTJ1SECAQLv4YsVGdyRI0o2fSoA=; b=sZThBjE8PmY2vTjErp4lZL+1nztc2Ajd2OQFdisIOA5cH5N6ZCJGsk8qiZSrl5mv8NgoxJ zYDShct98BiV+bLc3QcWmXZzzIaDpP7egomkPeLRHfAE5IIBNFn4MtmE3olF4jSO+aGzz4 4teSKn4YHbajhglStLPuI/ihxUtpuONqTslF5hgWpNxU/lq/lhFkxRojCVZ3JqUu/B5UPl nvkB5C22/GQAKgJ9tOK67+XpDSrhet4qMZ2eLX3KKRvrCBqC503RQDQzvDwjgDhLvcY29X NkxoQf/BxH0TvKq1FPiK/Cdyn9sHJrHBvKSjSm5cJxy2vcu18VnFHa6HZnya5A== To: Andrew Lunn , davem@davemloft.net, Eric Dumazet , Jakub Kicinski , Paolo Abeni , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Shawn Guo Cc: Sascha Hauer , Pengutronix Kernel Team , Fabio Estevam , Richard Cochran , netdev@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, imx@lists.linux.dev, linux-arm-kernel@lists.infradead.org, Stefan Wahren , Simon Horman , Lukasz Majewski Subject: [net-next v23 3/7] net: mtip: Add buffers management functions to the L2 switch driver Date: Thu, 5 Feb 2026 00:21:31 +0100 Message-Id: <20260204232135.1024665-4-lukasz.majewski@mailbox.org> In-Reply-To: <20260204232135.1024665-1-lukasz.majewski@mailbox.org> References: <20260204232135.1024665-1-lukasz.majewski@mailbox.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-MBO-RS-META: xixtm75scsgmxyz1rebngd9tkshe7d6t X-MBO-RS-ID: 1323bb323bcf88f108b Content-Type: text/plain; charset="utf-8" This patch provides buffers management funcions' content for MTIP L2 switch. Signed-off-by: Lukasz Majewski --- Changes for v14: - New patch - created by excluding some code from large (i.e. v13 and earlier) MTIP driver Changes for v15 - v20: - None Changes for v21: - Add check if fep->page[i] is not NULL before returning it to page pool Changes for v22: - Add fep->tx_bounce[i] =3D NULL; in the mtip_free_buffers Changes for v23: - None --- .../net/ethernet/freescale/mtipsw/mtipl2sw.c | 90 +++++++++++++++++++ 1 file changed, 90 insertions(+) diff --git a/drivers/net/ethernet/freescale/mtipsw/mtipl2sw.c b/drivers/net= /ethernet/freescale/mtipsw/mtipl2sw.c index 0a193a12e160..d209501a99b0 100644 --- a/drivers/net/ethernet/freescale/mtipsw/mtipl2sw.c +++ b/drivers/net/ethernet/freescale/mtipsw/mtipl2sw.c @@ -893,11 +893,101 @@ static void mtip_get_drvinfo(struct net_device *dev, =20 static void mtip_free_buffers(struct net_device *dev) { + struct mtip_ndev_priv *priv =3D netdev_priv(dev); + struct switch_enet_private *fep =3D priv->fep; + int i; + + for (i =3D 0; i < RX_RING_SIZE; i++) { + if (!fep->page[i]) + continue; + + page_pool_put_full_page(fep->page_pool, + fep->page[i], false); + fep->page[i] =3D NULL; + } + + page_pool_destroy(fep->page_pool); + fep->page_pool =3D NULL; + + for (i =3D 0; i < TX_RING_SIZE; i++) { + kfree(fep->tx_bounce[i]); + fep->tx_bounce[i] =3D NULL; + } +} + +static int mtip_create_page_pool(struct switch_enet_private *fep, int size) +{ + struct page_pool_params pp_params =3D { + .order =3D 0, + .flags =3D PP_FLAG_DMA_MAP | PP_FLAG_DMA_SYNC_DEV, + .pool_size =3D size, + .nid =3D dev_to_node(&fep->pdev->dev), + .dev =3D &fep->pdev->dev, + .dma_dir =3D DMA_FROM_DEVICE, + .offset =3D 0, + .max_len =3D MTIP_SWITCH_RX_FRSIZE, + }; + int ret =3D 0; + + fep->page_pool =3D page_pool_create(&pp_params); + if (IS_ERR(fep->page_pool)) { + ret =3D PTR_ERR(fep->page_pool); + fep->page_pool =3D NULL; + } + + return ret; } =20 static int mtip_alloc_buffers(struct net_device *dev) { + struct mtip_ndev_priv *priv =3D netdev_priv(dev); + struct switch_enet_private *fep =3D priv->fep; + struct cbd_t *bdp; + struct page *page; + int i, ret; + + ret =3D mtip_create_page_pool(fep, RX_RING_SIZE); + if (ret < 0) { + dev_err(&fep->pdev->dev, "Failed to create page pool\n"); + return ret; + } + + bdp =3D fep->rx_bd_base; + for (i =3D 0; i < RX_RING_SIZE; i++) { + page =3D page_pool_dev_alloc_pages(fep->page_pool); + if (!page) { + dev_err(&fep->pdev->dev, + "Failed to allocate page for rx buffer\n"); + goto err; + } + + bdp->cbd_bufaddr =3D page_pool_get_dma_addr(page); + fep->page[i] =3D page; + + bdp->cbd_sc =3D BD_ENET_RX_EMPTY; + bdp++; + } + + mtip_set_last_buf_to_wrap(bdp); + + bdp =3D fep->tx_bd_base; + for (i =3D 0; i < TX_RING_SIZE; i++) { + fep->tx_bounce[i] =3D kmalloc(MTIP_SWITCH_TX_FRSIZE, GFP_KERNEL); + if (!fep->tx_bounce[i]) + goto err; + + bdp->cbd_sc =3D 0; + bdp->cbd_bufaddr =3D 0; + bdp++; + } + + mtip_set_last_buf_to_wrap(bdp); + return 0; + + err: + mtip_free_buffers(dev); + return -ENOMEM; } =20 static int mtip_rx_napi(struct napi_struct *napi, int budget) --=20 2.39.5