From cc6b87ecaa96325577a8fafabc0d5972b816bc6c Mon Sep 17 00:00:00 2001 From: Ramon Fried Date: Sat, 18 Jul 2020 23:31:46 +0300 Subject: net: tftp: Add client support for RFC 7440 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 Reviewed-by: Marek Vasut --- README | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'README') diff --git a/README b/README index d4bf74ce75..121dc4966a 100644 --- a/README +++ b/README @@ -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. -- cgit v1.2.3