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net: Add a function to run dhcp

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At present this must be done by executing the command. Also it involves
fiddling with the environment to determine the correct autoload behaviour.

Ideally it should be possible to run network operations without even
having the command line present (CONFIG_CMDLINE).

For now, add a function to handle DHCP, so it can be called from a bootdev
more easily.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Ramon Fried <rfried.dev@gmail.com>
This commit is contained in:
Simon Glass 2023-01-17 10:47:39 -07:00 • committed by Tom Rini
parent 843160fa7a
commit c8c3fd24cc
2 changed files with 50 additions and 0 deletions
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35
cmd/net.c
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@ -4,6 +4,8 @@
* Wolfgang Denk, DENX Software Engineering, wd@denx.de.
*/
#define LOG_CATEGORY UCLASS_ETH
/*
* Boot support
*/
@ -13,6 +15,7 @@
#include <dm.h>
#include <env.h>
#include <image.h>
#include <log.h>
#include <net.h>
#include <net6.h>
#include <net/udp.h>
@ -120,6 +123,38 @@ U_BOOT_CMD(
"boot image via network using DHCP/TFTP protocol",
"[loadAddress] [[hostIPaddr:]bootfilename]"
);
int dhcp_run(ulong addr, const char *fname, bool autoload)
{
char *dhcp_argv[] = {"dhcp", NULL, (char *)fname, NULL};
struct cmd_tbl cmdtp = {}; /* dummy */
char file_addr[17];
int old_autoload;
int ret, result;
log_debug("addr=%lx, fname=%s, autoload=%d\n", addr, fname, autoload);
old_autoload = env_get_yesno("autoload");
ret = env_set("autoload", autoload ? "y" : "n");
if (ret)
return log_msg_ret("en1", -EINVAL);
if (autoload) {
sprintf(file_addr, "%lx", addr);
dhcp_argv[1] = file_addr;
}
result = do_dhcp(&cmdtp, 0, !autoload ? 1 : fname ? 3 : 2, dhcp_argv);
ret = env_set("autoload", old_autoload == -1 ? NULL :
old_autoload ? "y" : "n");
if (ret)
return log_msg_ret("en2", -EINVAL);
if (result)
return log_msg_ret("res", -ENOENT);
return 0;
}
#endif
#if defined(CONFIG_CMD_NFS)