mirror of
https://github.com/hardkernel/linux.git
synced 2026-06-06 02:50:49 +09:00
ef9369e9c3
When a page allocation fails during refill in mlx5e_refill_rx_wqes, the
page will be released again on the next refill call. This triggers the
page_pool negative page fragment count warning below:
[ 338.326070] WARNING: CPU: 4 PID: 0 at include/net/page_pool/helpers.h:130 mlx5e_page_release_fragmented.isra.0+0x42/0x50 [mlx5_core]
...
[ 338.328993] RIP: 0010:mlx5e_page_release_fragmented.isra.0+0x42/0x50 [mlx5_core]
[ 338.329094] Call Trace:
[ 338.329097] <IRQ>
[ 338.329100] ? __warn+0x7d/0x120
[ 338.329105] ? mlx5e_page_release_fragmented.isra.0+0x42/0x50 [mlx5_core]
[ 338.329173] ? report_bug+0x155/0x180
[ 338.329179] ? handle_bug+0x3c/0x60
[ 338.329183] ? exc_invalid_op+0x13/0x60
[ 338.329187] ? asm_exc_invalid_op+0x16/0x20
[ 338.329192] ? mlx5e_page_release_fragmented.isra.0+0x42/0x50 [mlx5_core]
[ 338.329259] mlx5e_post_rx_wqes+0x210/0x5a0 [mlx5_core]
[ 338.329327] ? mlx5e_poll_rx_cq+0x88/0x6f0 [mlx5_core]
[ 338.329394] mlx5e_napi_poll+0x127/0x6b0 [mlx5_core]
[ 338.329461] __napi_poll+0x25/0x1a0
[ 338.329465] net_rx_action+0x28a/0x300
[ 338.329468] __do_softirq+0xcd/0x279
[ 338.329473] irq_exit_rcu+0x6a/0x90
[ 338.329477] common_interrupt+0x82/0xa0
[ 338.329482] </IRQ>
This patch fixes the legacy rq case by releasing all allocated fragments
and then setting the skip flag on all released fragments. It is
important to note that the number of released fragments will be higher
than the number of allocated fragments when an allocation error occurs.
Fixes: 3f93f82988 ("net/mlx5e: RX, Defer page release in legacy rq for better recycling")
Tested-by: Chris Mason <clm@fb.com>
Reported-by: Chris Mason <clm@fb.com>
Closes: https://lore.kernel.org/netdev/117FF31A-7BE0-4050-B2BB-E41F224FF72F@meta.com
Signed-off-by: Dragos Tatulea <dtatulea@nvidia.com>
Reviewed-by: Tariq Toukan <tariqt@nvidia.com>
Signed-off-by: Saeed Mahameed <saeedm@nvidia.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.