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net: tftp: Add client support for RFC 7440

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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@gmail.com>
Reviewed-by: Marek Vasut <marex@denx.de>
This commit is contained in:
Ramon Fried 2020-07-18 23:31:46 +03:00 • committed by Tom Rini
parent 5cc7df7eba
commit cc6b87ecaa
3 changed files with 86 additions and 7 deletions
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@ -3444,6 +3444,11 @@ List of environment variables (most likely not complete):
downloads succeed with high packet loss rates, or with
unreliable TFTP servers or client hardware.
tftpwindowsize - if this is set, the value is used for TFTP's
window size as described by RFC 7440.
This means the count of blocks we can receive before
sending ack to server.
vlan - When set to a value < 4095 the traffic over
Ethernet is encapsulated/received over 802.1q
VLAN tagged frames.