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804627751b
Add multi-buffer support for AF_XDP by extending the XDP multi-buffer support to be reflected in user-space when a packet is redirected to an AF_XDP socket. In the XDP implementation, the NIC driver builds the xdp_buff from the first frag of the packet and adds any subsequent frags in the skb_shinfo area of the xdp_buff. In AF_XDP core, XDP buffers are allocated from xdp_sock's pool and data is copied from the driver's xdp_buff and frags. Once an allocated XDP buffer is full and there is still data to be copied, the 'XDP_PKT_CONTD' flag in'options' field of the corresponding xdp ring descriptor is set and passed to the application. When application sees the aforementioned flag set it knows there is pending data for this packet that will be carried in the following descriptors. If there is no more data to be copied, the flag in 'options' field is cleared for that descriptor signalling EOP to the application. If application reads a batch of descriptors using for example the libxdp interfaces, it is not guaranteed that the batch will end with a full packet. It might end in the middle of a packet and the rest of the frames of that packet will arrive at the beginning of the next batch. AF_XDP ensures that only a complete packet (along with all its frags) is sent to application. Signed-off-by: Tirthendu Sarkar <tirthendu.sarkar@intel.com> Link: https://lore.kernel.org/r/20230719132421.584801-6-maciej.fijalkowski@intel.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> |
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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.