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Introduce a set of tests that exercise various bucket resume scenarios: * remove_seen resumes iteration after removing a socket from the bucket that we've already processed. Before, with the offset-based approach, this test would have skipped an unseen socket after resuming iteration. With the cookie-based approach, we now see all sockets exactly once. * remove_unseen exercises the condition where the next socket that we would have seen is removed from the bucket before we resume iteration. This tests the scenario where we need to scan past the first cookie in our remembered cookies list to find the socket from which to resume iteration. * remove_all exercises the condition where all sockets we remembered were removed from the bucket to make sure iteration terminates and returns no more results. * add_some exercises the condition where a few, but not enough to trigger a realloc, sockets are added to the head of the current bucket between reads. Before, with the offset-based approach, this test would have repeated sockets we've already seen. With the cookie-based approach, we now see all sockets exactly once. * force_realloc exercises the condition that we need to realloc the batch on a subsequent read, since more sockets than can be held in the current batch array were added to the current bucket. This exercies the logic inside bpf_iter_udp_realloc_batch that copies cookies into the new batch to make sure nothing is skipped or repeated. Signed-off-by: Jordan Rife <jordan@jrife.io> Signed-off-by: Martin KaFai Lau <martin.lau@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.