[PATCH v4 13/13] eal: provide option to use compiler memcpy instead of RTE

[Stephen Hemminger]

On Thu, 20 Jun 2024 19:57:31 +0200
Mattias Rönnblom <mattias.ronnblom at ericsson.com> wrote:

> Provide build option to have functions in <rte_memcpy.h> delegate to
> the standard compiler/libc memcpy(), instead of using the various
> custom DPDK, handcrafted, per-architecture rte_memcpy()
> implementations.
> 
> A new meson build option 'use_cc_memcpy' is added. By default,
> the compiler/libc memcpy() is used.
> 
> The performance benefits of the custom DPDK rte_memcpy()
> implementations have been diminishing with every compiler release, and
> with current toolchains the use of a custom memcpy() implementation
> may even be a liability.
> 
> This patch leaves an option to stay on the custom DPDK implementations,
> would that prove beneficial for certain applications or architectures.
> 
> An additional benefit of this change is that compilers and static
> analysis tools have an easier time detecting incorrect usage of
> rte_memcpy() (e.g., buffer overruns, or overlapping source and
> destination buffers).
> 
> Signed-off-by: Mattias Rönnblom <mattias.ronnblom at ericsson.com>
> Acked-by: Morten Brørup <mb at smartsharesystems.com>

Would like to mark rte_memcpy as deprecated in a future release.

Acked-by: Stephen Hemminger <stephen at networkplumber.org>