netdev - [PATCH net-next 0/4] add frag page support in page pool

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Date:   Thu, 5 Aug 2021 19:05:22 +0800
From:   Yunsheng Lin <linyunsheng@...wei.com>
To:     <davem@...emloft.net>, <kuba@...nel.org>
CC:     <alexander.duyck@...il.com>, <linux@...linux.org.uk>,
        <mw@...ihalf.com>, <linuxarm@...neuler.org>,
        <yisen.zhuang@...wei.com>, <salil.mehta@...wei.com>,
        <thomas.petazzoni@...tlin.com>, <hawk@...nel.org>,
        <ilias.apalodimas@...aro.org>, <ast@...nel.org>,
        <daniel@...earbox.net>, <john.fastabend@...il.com>,
        <akpm@...ux-foundation.org>, <peterz@...radead.org>,
        <will@...nel.org>, <willy@...radead.org>, <vbabka@...e.cz>,
        <fenghua.yu@...el.com>, <guro@...com>, <peterx@...hat.com>,
        <feng.tang@...el.com>, <jgg@...pe.ca>, <mcroce@...rosoft.com>,
        <hughd@...gle.com>, <jonathan.lemon@...il.com>, <alobakin@...me>,
        <willemb@...gle.com>, <wenxu@...oud.cn>, <cong.wang@...edance.com>,
        <haokexin@...il.com>, <nogikh@...gle.com>, <elver@...gle.com>,
        <yhs@...com>, <kpsingh@...nel.org>, <andrii@...nel.org>,
        <kafai@...com>, <songliubraving@...com>, <netdev@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <bpf@...r.kernel.org>,
        <chenhao288@...ilicon.com>
Subject: [PATCH net-next 0/4] add frag page support in page pool

This patchset adds frag page support in page pool and
enable skb's page frag recycling based on page pool in
hns3 drvier.

V1:
1. avoid atomic_long_read() in case of freeing or draining
   page frag, and drop RFC tag.

RFC v6:
1. Disable frag page support in system 32-bit arch and
   64-bit DMA.

RFC v5:
1. Rename dma_addr[0] to pp_frag_count and adjust codes
   according to the rename.

RFC v4:
1. Use the dma_addr[1] to store bias.
2. Default to a pagecnt_bias of PAGE_SIZE - 1.
3. other minor comment suggested by Alexander.

RFC v3:
1. Implement the semantic of "page recycling only wait for the
   page pool user instead of all user of a page"
2. Support the frag allocation of different sizes
3. Merge patch 4 & 5 to one patch as it does not make sense to
   use page_pool_dev_alloc_pages() API directly with elevated
   refcnt.
4. other minor comment suggested by Alexander.

RFC v2:
1. Split patch 1 to more reviewable one.
2. Repurpose the lower 12 bits of the dma address to store the
   pagecnt_bias as suggested by Alexander.
3. support recycling to pool->alloc for elevated refcnt case
   too.

Yunsheng Lin (4):
  page_pool: keep pp info as long as page pool owns the page
  page_pool: add interface to manipulate frag count in page pool
  page_pool: add frag page recycling support in page pool
  net: hns3: support skb's frag page recycling based on page pool

 drivers/net/ethernet/hisilicon/Kconfig          |   1 +
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.c |  79 +++++++++++++++--
 drivers/net/ethernet/hisilicon/hns3/hns3_enet.h |   3 +
 drivers/net/ethernet/marvell/mvneta.c           |   6 +-
 drivers/net/ethernet/marvell/mvpp2/mvpp2_main.c |   2 +-
 drivers/net/ethernet/ti/cpsw.c                  |   2 +-
 drivers/net/ethernet/ti/cpsw_new.c              |   2 +-
 include/linux/mm_types.h                        |  18 ++--
 include/linux/skbuff.h                          |   4 +-
 include/net/page_pool.h                         |  68 +++++++++++---
 net/core/page_pool.c                            | 112 +++++++++++++++++++++++-
 11 files changed, 258 insertions(+), 39 deletions(-)

-- 
2.7.4