----- Original Message -----
> From: Andrey Borzenkov <arvidj...@gmail.com>
> To: Rigoberto Corujo <rcor...@yahoo.com>
> Cc: "help-g...@gnu.org" <help-g...@gnu.org>; grub-devel@gnu.org
> Sent: Wednesday, May 1, 2013 10:59 AM
> Subject: Re: Obtaining the MAC address of the boot NIC for a PXE boot
>
> В Mon, 29 Apr 2013 05:55:32 -0700 (PDT)
> Rigoberto Corujo <rcor...@yahoo.com> пишет:
>
>> Hello everyone,
>>
>> With pxelinux, you can specify "IPAPPEND 2" in your boot loader
> configuration file and the MAC address of the boot NIC automatically gets
> appended to your kernel parameters as "BOOTIF=XX:XX:XX:XX:XX:XX".
>>
>> I am now trying to become familiar with Grub 2, because if its EFI support.
> I noticed that with Grub 2, some of the documentation, which may be
> outdated,
> says that there is a "net_pxe_mac" variable which, as I understand it,
> should contain the MAC address of the boot NIC. However, I've built the
> latest Grub 2 sources and, when I PXE boot and drop into a grub shell prompt,
> if
> type "set", I don't see "net_pxe_mac" listed as one of
> the variables. I know there is a "net_ls_addr" command which prints
> out something like "efinet8 3c:4a:92:b2:6a:e8 10.1.1.114", but I
> don't know how to use Grub scripting to parse out the MAC address. I also
> don't know if there will ever be a case where "net_ls_addr" will
> print out multiple entries on a PXE boot, making it difficult to determine
> which
> one corresponds to the boot NIC.
>>
>>
>> Basically, I'm using the "ksdevice=bootif" kernel parameter
> when PXE booting my Red Hat kernel. With PXE Linux, "bootif" provides
> the MAC address of the boot NIC. I was hoping to do something like
> "ksdevice=${net_pxe_mac}", but since "net_pxe_mac" does not
> appear to be getting set, I need to find some other method.
>>
>
>
> As it stands currently, net_pxe_* variables are defined on PC BIOS
> platform only. For UEFI (which you apparently have) GRUB2 defines
> net_efinetNN_* variables where efinetNN is symbolic name for interface
> that was used to boot GRUB2.
>
> May be GRUB2 should also define net_pxe_* namespace for the case of
> UEFI. There is no real way to find out which interface was used for
> booting and even if there were, grub does not support nested
> variables substitution or eval'ing (like ${net_${boot_if}_mac).
>
> Probably, adding "eval" support is really the most simple. Could you
> test the patch below. What it does, is
>
> - it adds "eval" command (same as known from UNIX shells) which
> executes its argument
>
> - it exports boot interface as "efi_boot_interface" variable
>
> This should allow you to do
>
> if $grub_platform = efi ; then
> eval "set net_pxe_mac=\$net_${efi_boot_interface}_mac"
> fi
>
> and then use $net_pxe_mac on both platforms.
>
> If it works for you, I will clean it up; for consistency this is
> probably needed for ieee1275 as well.
>
> ---
> grub-core/Makefile.core.def | 5 ++++
> grub-core/commands/eval.c | 51 ++++++++++++++++++++++++++++++++++++++
> grub-core/net/drivers/efi/efinet.c | 2 ++
> 3 files changed, 58 insertions(+)
>
> diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
> index 7e19acb..8844f2f 100644
> --- a/grub-core/Makefile.core.def
> +++ b/grub-core/Makefile.core.def
> @@ -699,6 +699,11 @@ module = {
> };
>
> module = {
> + name = eval;
> + common = commands/eval.c;
> +};
> +
> +module = {
> name = extcmd;
> common = commands/extcmd.c;
> common = lib/arg.c;
> diff --git a/grub-core/commands/eval.c b/grub-core/commands/eval.c
> new file mode 100644
> index 0000000..a21ff89
> --- /dev/null
> +++ b/grub-core/commands/eval.c
> @@ -0,0 +1,51 @@
> +/*
> + * GRUB -- GRand Unified Bootloader
> + * Copyright (C) 2009 Free Software Foundation, Inc.
> + *
> + * GRUB is free software: you can redistribute it and/or modify
> + * it under the terms of the GNU General Public License as published by
> + * the Free Software Foundation, either version 3 of the License, or
> + * (at your option) any later version.
> + *
> + * GRUB is distributed in the hope that it will be useful,
> + * but WITHOUT ANY WARRANTY; without even the implied warranty of
> + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
> + * GNU General Public License for more details.
> + *
> + * You should have received a copy of the GNU General Public License
> + * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
> + */
> +
> +#include <grub/dl.h>
> +#include <grub/misc.h>
> +#include <grub/extcmd.h>
> +#include <grub/i18n.h>
> +#include <grub/term.h>
> +
> +GRUB_MOD_LICENSE ("GPLv3+");
> +
> +static grub_err_t
> +grub_cmd_eval (grub_extcmd_context_t ctxt __attribute__((__unused__)),
> + int argc, char *argv[])
> +{
> + char *dummy[1] = { NULL };
> +
> + if (argc != 1)
> + return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument
> expected"));
> + return grub_script_execute_sourcecode (argv[0], 0, dummy);
> +}
> +
> +static grub_extcmd_t cmd;
> +
> +GRUB_MOD_INIT(eval)
> +{
> + cmd = grub_register_extcmd ("eval", grub_cmd_eval, 0,
> + N_("[STRING]"), N_("Evaluate commands"),
> + NULL);
> +}
> +
> +GRUB_MOD_FINI(eval)
> +{
> + grub_unregister_extcmd (cmd);
> +}
> +
> diff --git a/grub-core/net/drivers/efi/efinet.c
> b/grub-core/net/drivers/efi/efinet.c
> index 2b344d6..f7d8fd5 100644
> --- a/grub-core/net/drivers/efi/efinet.c
> +++ b/grub-core/net/drivers/efi/efinet.c
> @@ -23,6 +23,7 @@
> #include <grub/efi/api.h>
> #include <grub/efi/efi.h>
> #include <grub/i18n.h>
> +#include <grub/env.h>
>
> GRUB_MOD_LICENSE ("GPLv3+");
>
> @@ -250,6 +251,7 @@ grub_efi_net_config_real (grub_efi_handle_t hnd, char
> **device,
> &pxe_mode->dhcp_ack,
> sizeof (pxe_mode->dhcp_ack),
> 1, device, path);
> + grub_env_set ("efi_boot_interface", card->name);
> return;
> }
> }
> --
> tg: (93daf86..) e/uefi_pxe_vars (depends on: master)
>
>
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>
Thank you very much, Andrey. This worked. I did have to add the following
lines to "grub-core/Makefile.core.am" to get a "eval.mod" generated, but I'm
sure that it's probably because I missed an important step that would have
automatically generated it.
if COND_x86_64_efi
platform_PROGRAMS += eval.module
MODULE_FILES += eval.module$(EXEEXT)
eval_module_SOURCES = commands/eval.c ## platform sources
nodist_eval_module_SOURCES = ## platform nodist sources
eval_module_LDADD =
eval_module_CFLAGS = $(AM_CFLAGS) $(CFLAGS_MODULE)
eval_module_LDFLAGS = $(AM_LDFLAGS) $(LDFLAGS_MODULE)
eval_module_CPPFLAGS = $(AM_CPPFLAGS) $(CPPFLAGS_MODULE)
eval_module_CCASFLAGS = $(AM_CCASFLAGS) $(CCASFLAGS_MODULE)
EXTRA_DIST +=
BUILT_SOURCES += $(nodist_eval_module_SOURCES)
CLEANFILES += $(nodist_eval_module_SOURCES)
MOD_FILES += eval.mod
MARKER_FILES += eval.marker
CLEANFILES += eval.marker
eval.marker: $(eval_module_SOURCES) $(nodist_eval_module_SOURCES)
$(TARGET_CPP) -DGRUB_LST_GENERATOR $(CPPFLAGS_MARKER) $(DEFS)
$(DEFAULT_INCLUDES) $(INCLUDES) $(eval_module_CPPFLAGS) $(CPPFLAGS) $^ > $@.new
|| (rm -f $@; exit 1)
grep 'MARKER' $@.new > $@; rm -f $@.new
endif
Anyway, thank you once again.
Rigoberto
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