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The TSO path called ionic_tx_map_skb() before preparing the TCP pseudo
checksum (ionic_tx_tcp_[inner_]pseudo_csum()), which may perform
skb_cow_head() and might modifies bytes in the linear header area.
Mapping first and then mutating the header risks:
- Using a stale DMA address if skb_cow_head() relocates the head, and/or
- Device reading stale header bytes on weakly-ordered systems
(CPU writes after mapping are not guaranteed visible without an
explicit dma_sync_single_for_device()).
Reorder the TX path to perform all header mutations (including
skb_cow_head()) *before* DMA mapping. Mapping is now done only after the
skb layout and header contents are final. This removes the need for any
post-mapping dma_sync and prevents on-wire corruption observed under
VLAN+TSO load after repeated runs.
This change is purely an ordering fix; no functional behavior change
otherwise.
Fixes: 0f3154e6bc ("ionic: Add Tx and Rx handling")
Signed-off-by: Mohammad Heib <mheib@redhat.com>
Reviewed-by: Brett Creeley <brett.creeley@amd.com>
Link: https://patch.msgid.link/20251031155203.203031-2-mheib@redhat.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.