net: tftp: Add help for CONFIG_TFTP_BLOCKSIZE

Add help message for the CONFIG_TFTP_BLOCKSIZE default value,
as explain in tftp.c before migration in commit b618b3707633
("net: Convert CONFIG_TFTP_BLOCKSIZE to Kconfig")

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>

diff --git a/net/Kconfig b/net/Kconfig
index 96bbce17785f5ced12be5b6ca7c3699bf1286ef6..ac6d0cf8a6fc51fd61386f46a854face43f31b71 100644 (file)
--- a/net/Kconfig
+++ b/net/Kconfig
@@ -44,5 +44,9 @@ config TFTP_BLOCKSIZE
        default 1468
        help
          Default TFTP block size.
+         The MTU is typically 1500 for ethernet, so a TFTP block of
+         1468 (MTU minus eth.hdrs) provides a good throughput with
+         almost-MTU block sizes.
+         You can also activate CONFIG_IP_DEFRAG to set a larger block.
 
 endif   # if NET