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[ Upstream commit 290779905d09d5fdf6caa4f58ddefc3f4db0c0a9 ] Ice and i40e ZC drivers currently set offset of a frag within skb_shared_info to 0, which is incorrect. xdp_buffs that come from xsk_buff_pool always have 256 bytes of a headroom, so they need to be taken into account to retrieve xdp_buff::data via skb_frag_address(). Otherwise, bpf_xdp_frags_increase_tail() would be starting its job from xdp_buff::data_hard_start which would result in overwriting existing payload. Fixes:1c9ba9c146("i40e: xsk: add RX multi-buffer support") Fixes:1bbc04de60("ice: xsk: add RX multi-buffer support") Acked-by: Magnus Karlsson <magnus.karlsson@intel.com> Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Link: https://lore.kernel.org/r/20240124191602.566724-8-maciej.fijalkowski@intel.com Signed-off-by: Alexei Starovoitov <ast@kernel.org> Signed-off-by: Sasha Levin <sashal@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.