net: lwip: add tftpsrv command

The legacy network stack supports tftpsrv, which listens for an
incoming TFTP write request and receives the first file into memory.
Despite the old command help wording, the command returns after
receiving the file and does not boot it automatically.

The lwIP stack already builds the lwIP TFTP application, but only wires
it up for client-side tftpboot. Add a lwIP tftpsrv command and
implement the server path with tftp_init_server(). Reuse the existing
lwIP TFTP write callback and memory copy path so LMB checks, progress
output, filesize/fileaddr updates and EFI bootdev handling stay
consistent with tftpboot.

Track receive timeout and write-failure state around the lwIP callbacks
so a stalled or rejected receive is not reported as a successful close.

Move CMD_TFTPSRV out of the legacy-only Kconfig block so it can be
enabled with either network stack. Update the command help text and add
usage documentation for the receive-only behavior.

Add pytest coverage for tftpsrv using a generated host file and curl's
TFTP upload support. Enable the command in qemu_arm64_lwip_defconfig so
the test can be run with the existing lwIP QEMU build when the boardenv
provides env__net_tftpsrv_file.

Signed-off-by: James Hilliard <[email protected]>
[Jerome Forissier: remove trailing ':' after SPDX tag]
Signed-off-by: Jerome Forissier <[email protected]>
Reviewed-by: Jerome Forissier <[email protected]>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/net-lwip.h b/include/net-lwip.h
index 5d0627eb271..8e59a2299e0 100644
--- a/include/net-lwip.h
+++ b/include/net-lwip.h
@@ -53,6 +53,7 @@ bool wget_validate_uri(char *uri);
 
 int do_dns(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
 int do_nfs(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
+int do_tftpsrv(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[]);
 int do_wget(struct cmd_tbl *cmdtp, int flag, int argc, char * const argv[]);
 
 #endif /* __NET_LWIP_H__ */