225480f040
Ioana Ciornei says: ==================== net: dpaa2-eth: AF_XDP zero-copy support This patch set adds support for AF_XDP zero-copy in the dpaa2-eth driver. The support is available on the LX2160A SoC and its variants and only on interfaces (DPNIs) with a maximum of 8 queues (HW limitations are the root cause). We are first implementing the .get_channels() callback since this a dependency for further work. Patches 2-3 are working on making the necessary changes for multiple buffer pools on a single interface. By default, without an AF_XDP socket attached, only a single buffer pool will be used and shared between all the queues. The changes in the functions are made in this patch, but the actual allocation and setup of a new BP is done in patch#10. Patches 4-5 are improving the information exposed in debugfs. We are exposing a new file to show which buffer pool is used by what channels and how many buffers it currently has. The 6th patch updates the dpni_set_pools() firmware API so that we are capable of setting up a different buffer per queue in later patches. In the 7th patch the generic dev_open/close APIs are used instead of the dpaa2-eth internal ones. Patches 8-9 are rearranging the existing code in dpaa2-eth.c in order to create new functions which will be used in the XSK implementation in dpaa2-xsk.c Finally, the last 3 patches are adding the actual support for both the Rx and Tx path of AF_XDP zero-copy and some associated tracepoints. Details on the implementation can be found in the actual patch. Changes in v2: - 3/12: Export dpaa2_eth_allocate_dpbp/dpaa2_eth_free_dpbp in this patch to avoid a build warning. The functions will be used in next patches. - 6/12: Use __le16 instead of u16 for the dpbp_id field. - 12/12: Use xdp_buff->data_hard_start when tracing the BP seeding. Changes in v3: - 3/12: fix leaking of bp on error path ==================== Acked-by: Björn Töpel <bjorn@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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.