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1ee8d6f3be
With the future introduction of some new fields into enetc_tx_swbd such as is_xdp_tx, is_xdp_redirect etc, we need not only to set these bits to true from the XDP_TX/XDP_REDIRECT code path, but also to false from the old code paths. This is because TX software buffer descriptors are kept in a ring that is shadow of the hardware TX ring, so these structures keep getting reused, and there is always the possibility that when a software BD is reused (after we ran a full circle through the TX ring), the old user of the tx_swbd had set is_xdp_tx = true, and now we are sending a regular skb, which would need to set is_xdp_tx = false. To be minimally invasive to the old code paths, let's just scrub the software TX BD in the TX confirmation path (enetc_clean_tx_ring), once we know that nobody uses this software TX BD (tx_ring->next_to_clean hasn't yet been updated, and the TX paths check enetc_bd_unused which tells them if there's any more space in the TX ring for a new enqueue). Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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.