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For transmitting an AF_XDP packet, allocate skb while processing the first desc and copy data to it. The 'XDP_PKT_CONTD' flag in 'options' field of the desc indicates the EOP status of the packet. If the current desc is not EOP, store the skb, release the current desc and go on to read the next descs. Allocate a page for each subsequent desc, copy data to it and add it as a frag in the skb stored in xsk. On processing EOP, transmit the skb with frags. Addresses contained in descs have been already queued in consumer queue and skb destructor updated the completion count. On transmit failure cancel the releases, clear the descs from the completion queue and consume the skb for retrying packet transmission. For any invalid descriptor (invalid length/address/options) in the middle of a packet, all pending descriptors will be dropped by xsk core along with the invalid one and the next descriptor is treated as the start of a new packet. Maximum supported frames for a packet is MAX_SKB_FRAGS + 1. If it is exceeded, all descriptors accumulated so far are dropped. Signed-off-by: Tirthendu Sarkar <tirthendu.sarkar@intel.com> Link: https://lore.kernel.org/r/20230719132421.584801-9-maciej.fijalkowski@intel.com Signed-off-by: Alexei Starovoitov <ast@kernel.org>
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.