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[ Upstream commit d53d4dcce69be5773e2d0878c9899ebfbf58c393 ] When working on multi-buffer packet on arch that has PAGE_SIZE >= 8192, truesize is calculated and stored in xdp_buff::frame_sz per each processed Rx buffer. This means that frame_sz will contain the truesize based on last received buffer, but commit1dc1a7e7f4("ice: Centrallize Rx buffer recycling") assumed this value will be constant for each buffer, which breaks the page recycling scheme and mess up the way we update the page::page_offset. To fix this, let us work on constant truesize when PAGE_SIZE >= 8192 instead of basing this on size of a packet read from Rx descriptor. This way we can simplify the code and avoid calculating truesize per each received frame and on top of that when using xdp_update_skb_shared_info(), current formula for truesize update will be valid. This means ice_rx_frame_truesize() can be removed altogether. Furthermore, first call to it within ice_clean_rx_irq() for 4k PAGE_SIZE was redundant as xdp_buff::frame_sz is initialized via xdp_init_buff() in ice_vsi_cfg_rxq(). This should have been removed at the point where xdp_buff struct started to be a member of ice_rx_ring and it was no longer a stack based variable. There are two fixes tags as my understanding is that the first one exposed us to broken truesize and page_offset handling and then second introduced broken skb_shared_info update in ice_{construct,build}_skb(). Reported-and-tested-by: Luiz Capitulino <luizcap@redhat.com> Closes: https://lore.kernel.org/netdev/8f9e2a5c-fd30-4206-9311-946a06d031bb@redhat.com/ Fixes:1dc1a7e7f4("ice: Centrallize Rx buffer recycling") Fixes:2fba7dc515("ice: Add support for XDP multi-buffer on Rx side") Signed-off-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Tested-by: Chandan Kumar Rout <chandanx.rout@intel.com> (A Contingent Worker at Intel) Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com> 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.