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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2013 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/net/netbuff.h>
#include <grub/uboot/disk.h>
#include <grub/uboot/uboot.h>
#include <grub/uboot/api_public.h>
#include <grub/dl.h>
#include <grub/net.h>
#include <grub/time.h>
#include <grub/i18n.h>
GRUB_MOD_LICENSE ("GPLv3+");
static grub_err_t
card_open (struct grub_net_card *dev)
{
int status;
status = grub_uboot_dev_open (dev->data);
if (status)
return grub_error (GRUB_ERR_IO, "Couldn't open network card.");
return GRUB_ERR_NONE;
}
static void
card_close (struct grub_net_card *dev)
{
grub_uboot_dev_close (dev->data);
}
static grub_err_t
send_card_buffer (struct grub_net_card *dev, struct grub_net_buff *pack)
{
int status;
grub_size_t len;
len = (pack->tail - pack->data);
if (len > dev->mtu)
len = dev->mtu;
grub_memcpy (dev->txbuf, pack->data, len);
status = grub_uboot_dev_send (dev->data, dev->txbuf, len);
if (status)
return grub_error (GRUB_ERR_IO, N_("couldn't send network packet"));
return GRUB_ERR_NONE;
}
static struct grub_net_buff *
get_card_packet (struct grub_net_card *dev)
{
int rc;
grub_uint64_t start_time;
struct grub_net_buff *nb;
int actual;
nb = grub_netbuff_alloc (dev->mtu + 64 + 2);
if (!nb)
return NULL;
/* Reserve 2 bytes so that 2 + 14/18 bytes of ethernet header is divisible
by 4. So that IP header is aligned on 4 bytes. */
grub_netbuff_reserve (nb, 2);
start_time = grub_get_time_ms ();
do
{
rc = grub_uboot_dev_recv (dev->data, nb->data, dev->mtu + 64, &actual);
grub_dprintf ("net", "rc=%d, actual=%d, time=%lld\n", rc, actual,
grub_get_time_ms () - start_time);
}
while ((actual <= 0 || rc < 0) && (grub_get_time_ms () - start_time < 200));
if (actual > 0)
{
grub_netbuff_put (nb, actual);
return nb;
}
grub_netbuff_free (nb);
return NULL;
}
static struct grub_net_card_driver ubootnet =
{
.name = "ubnet",
.open = card_open,
.close = card_close,
.send = send_card_buffer,
.recv = get_card_packet
};
GRUB_MOD_INIT (ubootnet)
{
int devcount, i;
int nfound = 0;
devcount = grub_uboot_dev_enum ();
for (i = 0; i < devcount; i++)
{
struct device_info *devinfo = grub_uboot_dev_get (i);
struct grub_net_card *card;
if (!(devinfo->type & DEV_TYP_NET))
continue;
card = grub_zalloc (sizeof (struct grub_net_card));
if (!card)
{
grub_print_error ();
return;
}
/* FIXME: Any way to check this? */
card->mtu = 1500;
grub_memcpy (&(card->default_address.mac), &devinfo->di_net.hwaddr, 6);
card->default_address.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;
card->txbufsize = ALIGN_UP (card->mtu, 64) + 256;
card->txbuf = grub_zalloc (card->txbufsize);
if (!card->txbuf)
{
grub_free (card);
grub_print_error ();
continue;
}
card->data = devinfo;
card->flags = 0;
card->name = grub_xasprintf ("ubnet_%d", ++nfound);
card->idle_poll_delay_ms = 10;
card->driver = &ubootnet;
grub_net_card_register (card);
}
}
GRUB_MOD_FINI (ubootnet)
{
struct grub_net_card *card, *next;
FOR_NET_CARDS_SAFE (card, next)
if (card->driver && grub_strcmp (card->driver->name, "ubnet") == 0)
grub_net_card_unregister (card);
}
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