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d6c7b03497
Netlink code depends on NAPI instances being sorted by ID on the netdev list for dump continuation. We need to be able to find the position on the list where we left off if dump does not fit in a single skb, and in the meantime NAPI instances can come and go. This was trivially true when we were assigning a new ID to every new NAPI instance. Since we added the NAPI config API, we try to retain the ID previously used for the same queue, but still add the new NAPI instance at the start of the list. This is fine if we reset the entire netdev and all NAPIs get removed and added back. If driver replaces a NAPI instance during an operation like DEVMEM queue reset, or recreates a subset of NAPI instances in other ways we may end up with broken ordering, and therefore Netlink dumps with either missing or duplicated entries. At this stage the problem is theoretical. Only two drivers support queue API, bnxt and gve. gve recreates NAPIs during queue reset, but it doesn't support NAPI config. bnxt supports NAPI config but doesn't recreate instances during reset. We need to save the ID in the config as soon as it is assigned because otherwise the new NAPI will not know what ID it will get at enable time, at the time it is being added. Reviewed-by: Willem de Bruijn <willemb@google.com> Reviewed-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: Paolo Abeni <pabeni@redhat.com> |
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| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .clippy.toml | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
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 reStructuredText 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.