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idpf has a limit on number of scatter-gather frags that can be used per segment. Currently, idpf_tx_start() checks if the limit is hit and forces a linearization of the whole packet. This requires high order allocations that can fail under memory pressure. A full size BIG-TCP packet would require order-7 alocation on x86_64 :/ We can move the check earlier from idpf_features_check() for TSO packets, to force GSO in this case, removing the cost of a big copy. This means that a linearization will eventually happen with sizes smaller than one MSS. __idpf_chk_linearize() is renamed to idpf_chk_tso_segment() and moved to idpf_lib.c Signed-off-by: Eric Dumazet <edumazet@google.com> Cc: Przemek Kitszel <przemyslaw.kitszel@intel.com> Cc: Jacob Keller <jacob.e.keller@intel.com> Cc: Madhu Chittim <madhu.chittim@intel.com> Cc: Pavan Kumar Linga <pavan.kumar.linga@intel.com> Cc: Willem de Bruijn <willemb@google.com> Cc: Andrew Lunn <andrew+netdev@lunn.ch> Reviewed-by: Joshua Hay <joshua.a.hay@intel.com> Tested-by: Brian Vazquez <brianvv@google.com> Acked-by: Tony Nguyen <anthony.l.nguyen@intel.com> Link: https://patch.msgid.link/20250818195934.757936-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba@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 reStructuredText 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.