From patchwork Fri Oct 13 06:48:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yunsheng Lin X-Patchwork-Id: 13420197 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 7E642CDB482 for ; Fri, 13 Oct 2023 06:48:35 +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=43DY/0njkbe+KOWbeB5izILqBJkSD3okqDgOoyKuniU=; b=sEZFt0LQ2THWWC J8DwmttOHEKo4TZh6y16kQAujoHK5HkWs4AQzW71O/84BAvysb4K1sj16kSrdtTMh4fbz8ECCAdV8 0YtNvrCz5IBMqqOL4VGbc3RxM69kNFv7nl2RZSuP4DN/3DvLTTs9wXgyvp/jC3weccQDWQ5cUA0bh CAWGGl71bznk2lGHgJOJH2RmOt7WVgDPiyYPkquhn2/KwhAH+ov23kXZpGL+vT6ef4i8PJjx/vT6S N5upBQ4aBReAe26XBBVqlz8IzBp5tq+MbdnMUtZtWc4ftElnTfNqetYVCOmyDMGMV2qyR85WudRZB j/oPyP2WMQXfwjM0ke8w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qrBxx-002dPr-0X; Fri, 13 Oct 2023 06:48:09 +0000 Received: from szxga03-in.huawei.com ([45.249.212.189]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qrBxs-002dJx-3C; Fri, 13 Oct 2023 06:48:07 +0000 Received: from dggpemm500005.china.huawei.com (unknown [172.30.72.57]) by szxga03-in.huawei.com (SkyGuard) with ESMTP id 4S6H626vq5z1kv6l; Fri, 13 Oct 2023 14:43:54 +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 15.1.2507.31; Fri, 13 Oct 2023 14:47:54 +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 v11 0/6] introduce page_pool_alloc() related API Date: Fri, 13 Oct 2023 14:48:20 +0800 Message-ID: <20231013064827.61135-1-linyunsheng@huawei.com> X-Mailer: git-send-email 2.33.0 MIME-Version: 1.0 X-Originating-IP: [10.69.192.56] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) 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-20231012_234805_366845_37668CBD X-CRM114-Status: GOOD ( 15.59 ) 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] & [3], 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 page pool API for the driver to allocate memory with least memory utilization and performance penalty when it doesn't know the size of memory it need beforehand. 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/ 3. https://github.com/alobakin/linux/tree/iavf-pp-frag V11: Repost based on the latest net-next branch and collect Tested-by Tag from Alexander. V10: Use fragment instead of frag in English docs. Remove PP_FLAG_PAGE_FRAG usage in idpf driver. V9: Update some performance info in patch 2. V8: Store the dma addr on a shifted u32 instead of using dma_addr_t explicitly for 32-bit arch with 64-bit DMA. Update document according to discussion in v7. V7: Fix a compile error, a few typo and use kernel-doc syntax. V6: Add a PP_FLAG_PAGE_SPLIT_IN_DRIVER flag to fail the page_pool creation for 32-bit arch with 64-bit DMA when driver tries to do the page splitting itself, adjust the requested size to include head/tail room in veth, and rebased on the latest next-net. v5 RFC: Add a new page_pool_cache_alloc() API, and other minor change as discussed in v4. As there seems to be three comsumers that might be made use of the new API, so repost it as RFC and CC the relevant authors to see if the new API fits their need. V4. Fix a typo and add a patch to update document about frag API, PAGE_POOL_DMA_USE_PP_FRAG_COUNT is not renamed yet as we may need a different thread to discuss that. V3: Incorporate changes from the disscusion with Alexander, mostly the inline wraper, PAGE_POOL_DMA_USE_PP_FRAG_COUNT change split to separate patch and comment change. 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 (6): page_pool: fragment API support for 32-bit arch with 64-bit DMA page_pool: unify frag_count handling in page_pool_is_last_frag() page_pool: remove PP_FLAG_PAGE_FRAG page_pool: introduce page_pool[_cache]_alloc() API page_pool: update document about fragment API net: veth: use newly added page pool API for veth with xdp Documentation/networking/page_pool.rst | 4 +- drivers/net/ethernet/broadcom/bnxt/bnxt.c | 2 - .../net/ethernet/hisilicon/hns3/hns3_enet.c | 3 +- drivers/net/ethernet/intel/idpf/idpf_txrx.c | 3 - .../marvell/octeontx2/nic/otx2_common.c | 2 +- .../net/ethernet/mellanox/mlx5/core/en_main.c | 2 +- drivers/net/veth.c | 25 +- drivers/net/wireless/mediatek/mt76/mac80211.c | 2 +- include/linux/mm_types.h | 13 +- include/net/page_pool/helpers.h | 231 +++++++++++++++--- include/net/page_pool/types.h | 6 +- net/core/page_pool.c | 31 ++- net/core/skbuff.c | 2 +- 13 files changed, 243 insertions(+), 83 deletions(-)