From patchwork Mon May 29 09:28:37 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yunsheng Lin X-Patchwork-Id: 13258350 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C7B6EC77B7E for ; Mon, 29 May 2023 09:31:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:Message-ID:Date:Subject:CC :To:From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To:References: List-Owner; bh=M2wFY6senGp2LQnFDxRYeCPqG41b52bGvC1vG8D8sOw=; b=LAT38FjbE/hb86 ORQGk5rtnreUb3rU0goC3f4LCEEv88ZZVhWv07h8jsuUEXaM1kLXOG3ltWlPvmoMa8zq1N0A8F12v XPBXYJOFsm2FJNxeadV05gb5lVODIAJ/Mlt3/fL+C2VYya52eo0fb90QG0cTqii4FyhjrnidxZUzQ YIQn3MfKpWfWT19ycpbxv2je+ofs6nP9UqPLKB6U1KqG6BoK3+6p7I6GWyI1Xpjj4QjgI9vVe/x7h NTb1vswS0PRkiSFPhQJzgkHYJD+lCYrZU+FJa8H+67f5lNP1d250VIAuIZFftZJr25Zvmgnd64rJ8 DnGhhtp5kwQC7oskpUjA==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1q3ZDF-009qMv-1U; Mon, 29 May 2023 09:30:49 +0000 Received: from szxga02-in.huawei.com ([45.249.212.188]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1q3ZDC-009qJv-1y; Mon, 29 May 2023 09:30:48 +0000 Received: from dggpemm500005.china.huawei.com (unknown [172.30.72.53]) by szxga02-in.huawei.com (SkyGuard) with ESMTP id 4QV9DC1bRBzLqB7; Mon, 29 May 2023 17:27:39 +0800 (CST) Received: from localhost.localdomain (10.69.192.56) by dggpemm500005.china.huawei.com (7.185.36.74) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.23; Mon, 29 May 2023 17:30:37 +0800 From: Yunsheng Lin To: , , CC: , , Yunsheng Lin , Alexei Starovoitov , Daniel Borkmann , Jesper Dangaard Brouer , John Fastabend , Matthias Brugger , AngeloGioacchino Del Regno , , , Subject: [PATCH net-next v2 0/3] support non-frag page for page_pool_alloc_frag() Date: Mon, 29 May 2023 17:28:37 +0800 Message-ID: <20230529092840.40413-1-linyunsheng@huawei.com> X-Mailer: git-send-email 2.33.0 MIME-Version: 1.0 X-Originating-IP: [10.69.192.56] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To dggpemm500005.china.huawei.com (7.185.36.74) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230529_023046_840219_5C3A3ADE X-CRM114-Status: GOOD ( 10.42 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org In [1] & [2], there are usecases for veth and virtio_net to use frag support in page pool to reduce memory usage, and it may request different frag size depending on the head/tail room space for xdp_frame/shinfo and mtu/packet size. When the requested frag size is large enough that a single page can not be split into more than one frag, using frag support only have performance penalty because of the extra frag count handling for frag support. So this patchset provides a way for user to fail back to non frag page when a page is not able to hold two frags. And PP_FLAG_PAGE_FRAG can be removed now, the extra benefit is that driver does not need to handle the case for arch with PAGE_POOL_DMA_USE_PP_FRAG_COUNT when using page_pool_alloc_frag() API. 1. https://patchwork.kernel.org/project/netdevbpf/patch/d3ae6bd3537fbce379382ac6a42f67e22f27ece2.1683896626.git.lorenzo@kernel.org/ 2. https://patchwork.kernel.org/project/netdevbpf/patch/20230526054621.18371-3-liangchen.linux@gmail.com/ V2: Add patch to remove PP_FLAG_PAGE_FRAG flags and mention virtio_net usecase in the cover letter. V1: Drop RFC tag and page_pool_frag patch Yunsheng Lin (3): page_pool: unify frag page and non-frag page handling page_pool: support non-frag page for page_pool_alloc_frag() page_pool: remove PP_FLAG_PAGE_FRAG flag .../net/ethernet/hisilicon/hns3/hns3_enet.c | 3 +- .../marvell/octeontx2/nic/otx2_common.c | 2 +- .../net/ethernet/mellanox/mlx5/core/en_main.c | 2 +- drivers/net/wireless/mediatek/mt76/mac80211.c | 2 +- include/net/page_pool.h | 42 +++++++++++---- net/core/page_pool.c | 52 +++++++++++-------- net/core/skbuff.c | 2 +- 7 files changed, 67 insertions(+), 38 deletions(-)