[PATCH v5] net: tftp: Add client support for RFC 7440

[Tom Rini]

On Sat, Jul 18, 2020 at 11:31:46PM +0300, Ramon Fried wrote:

> Add support for RFC 7440: "TFTP Windowsize Option".
> 
> This optional feature allows the client and server
> to negotiate a window size of consecutive blocks to send as an
> alternative for replacing the single-block lockstep schema.
> 
> windowsize can be defined statically during compilation by
> setting CONFIG_TFTP_WINDOWSIZE, or defined in runtime by
> setting an environment variable: "tftpwindowsize"
> If not defined, the windowsize is set to 1, meaning that it
> behaves as it was never defined.
> 
> Choosing the appropriate windowsize depends on the specific
> network topology, underlying NIC.
> You should test various windowsize scenarios and see which
> best work for you.
> 
> Setting a windowsize too big can actually decreases performance.
> 
> Signed-off-by: Ramon Fried <rfried.dev at gmail.com>
> Reviewed-by: Marek Vasut <marex at denx.de>

Applied to u-boot/master, thanks!

-- 
Tom
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