netdev - [PATCH net-next v3 0/3] Fix late DMA unmap crash for page pool

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Message-Id: <20250326-page-pool-track-dma-v3-0-8e464016e0ac@redhat.com>
Date: Wed, 26 Mar 2025 09:18:37 +0100
From: Toke Høiland-Jørgensen <toke@...hat.com>
To: "David S. Miller" <davem@...emloft.net>, 
 Jakub Kicinski <kuba@...nel.org>, Jesper Dangaard Brouer <hawk@...nel.org>, 
 Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>, 
 Tariq Toukan <tariqt@...dia.com>, Andrew Lunn <andrew+netdev@...n.ch>, 
 Eric Dumazet <edumazet@...gle.com>, Paolo Abeni <pabeni@...hat.com>, 
 Ilias Apalodimas <ilias.apalodimas@...aro.org>, 
 Simon Horman <horms@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, 
 Mina Almasry <almasrymina@...gle.com>, 
 Yonglong Liu <liuyonglong@...wei.com>, 
 Yunsheng Lin <linyunsheng@...wei.com>, 
 Pavel Begunkov <asml.silence@...il.com>, 
 Matthew Wilcox <willy@...radead.org>
Cc: netdev@...r.kernel.org, bpf@...r.kernel.org, linux-rdma@...r.kernel.org, 
 linux-mm@...ck.org, 
 Toke Høiland-Jørgensen <toke@...hat.com>, 
 Qiuling Ren <qren@...hat.com>, Yuying Ma <yuma@...hat.com>
Subject: [PATCH net-next v3 0/3] Fix late DMA unmap crash for page pool

This series fixes the late dma_unmap crash for page pool first reported
by Yonglong Liu in [0]. It is an alternative approach to the one
submitted by Yunsheng Lin, most recently in [1]. The first two commits
are small refactors of the page pool code, in preparation of the main
change in patch 3. See the commit message of patch 3 for the details.

-Toke

[0] https://lore.kernel.org/lkml/8067f204-1380-4d37-8ffd-007fc6f26738@kernel.org/T/
[1] https://lore.kernel.org/r/20250307092356.638242-1-linyunsheng@huawei.com

Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
---
Changes in v3:
- Use a full-width bool for pp->dma_sync instead of a full unsigned
  long (in patch 2), and leave pp->dma_sync_cpu alone.

- Link to v2: https://lore.kernel.org/r/20250325-page-pool-track-dma-v2-0-113ebc1946f3@redhat.com

Changes in v2:
- Always leave two bits at the top of pp_magic as zero, instead of one

- Add an rcu_read_lock() around __page_pool_dma_sync_for_device()

- Add a comment in poison.h with a reference to the bitmask definition

- Add a longer description of the logic of the bitmask definitions to
  the comment in types.h, and a summary of the security implications of
  using the pp_magic field to the commit message of patch 3

- Collect Mina's Reviewed-by and Yonglong's Tested-by tags

- Link to v1: https://lore.kernel.org/r/20250314-page-pool-track-dma-v1-0-c212e57a74c2@redhat.com

---
Toke Høiland-Jørgensen (3):
      page_pool: Move pp_magic check into helper functions
      page_pool: Turn dma_sync into a full-width bool field
      page_pool: Track DMA-mapped pages and unmap them when destroying the pool

 drivers/net/ethernet/mellanox/mlx5/core/en/xdp.c |  4 +-
 include/linux/poison.h                           |  4 ++
 include/net/page_pool/types.h                    | 65 ++++++++++++++++++-
 mm/page_alloc.c                                  |  9 +--
 net/core/netmem_priv.h                           | 33 +++++++++-
 net/core/page_pool.c                             | 81 ++++++++++++++++++++----
 net/core/skbuff.c                                | 16 +----
 net/core/xdp.c                                   |  4 +-
 8 files changed, 176 insertions(+), 40 deletions(-)
---
base-commit: 45e36a8e3c17c4d50ecbc863893f253fb46ac070
change-id: 20250310-page-pool-track-dma-0332343a460e