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This will be useful to allow busy poll for tunneled traffic. In case of busy poll for sessions over tunnels, the underlying physical device's queues need to be polled. Tunnels schedule NAPI either via netif_rx() for backlog queue or schedule the gro_cell_poll(). netif_rx() propagates the valid skb->napi_id to the socket. OTOH, gro_cell_poll() stamps the skb->napi_id again by calling skb_mark_napi_id() with the tunnel NAPI which is not a busy poll candidate. This was preventing tunneled traffic to use busy poll. A valid NAPI ID in the skb indicates it was already marked for busy poll by a NAPI driver and hence needs to be copied into the socket. Signed-off-by: Amritha Nambiar <amritha.nambiar@intel.com> Reviewed-by: Eric Dumazet <edumazet@google.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.