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/*
* Copyright 2014-present Facebook. All Rights Reserved.
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <unistd.h>
#include <sys/select.h>
#include <sys/time.h>
#include <sys/errno.h>
#include "nic.h"
#include "intf.h"
#include "openbmc/log.h"
#include "facebook/wedge_eeprom.h"
#define WAIT4PACKET_TIMEOUT 10000 /* 10ms */
#define NO_RCV_CHECK_THRESHOLD 100 /* if not receiving pkt for 100 times (1s),
* check the NIC status
*/
static void io_loop(oob_nic *nic, oob_intf *intf, const uint8_t mac[6]) {
fd_set rfds;
int fd = oob_intf_get_fd(intf);
struct timeval timeout;
int rc;
int n_fds;
int n_io;
char buf[NIC_PKT_SIZE_MAX];
int no_rcv = 0;
struct oob_nic_status_t sts;
while (1) {
memset(&timeout, 0, sizeof(timeout));
timeout.tv_sec = 0;
timeout.tv_usec = WAIT4PACKET_TIMEOUT;
FD_ZERO(&rfds);
FD_SET(fd, &rfds);
n_fds = select(fd + 1, &rfds, NULL, NULL, &timeout);
if (n_fds < 0) {
rc = errno;
LOG_ERR(rc, "Failed to select");
continue;
}
/*
* no matter what, receive packet from nic first, as the nic
* has small amount of memory. Without read, the sending could
* fail due to OOM.
*
* TODO: We might want to do something smart here to prevent attack or
* just rx flooding. Disable the Receive Enable first, drain the buffer
* with oob_nic_receive(), then Tx, and enable Receive Enable after.
*/
for (n_io = 0; n_io < 16; n_io++) {
rc = oob_nic_receive(nic, buf, sizeof(buf));
if (rc <= 0) {
no_rcv++;
break;
}
oob_intf_send(intf, buf, rc);
no_rcv = 0;
}
/*
* if we didn't receive any packet for NO_RCV_CHECK_THRESHOLD times,
* check the nic status
*/
if (no_rcv >= NO_RCV_CHECK_THRESHOLD) {
while(oob_nic_get_status(nic, &sts)) {
usleep(1000);
}
LOG_INFO("Failed to receive packets for %d times. NIC status is "
"%x.%x", NO_RCV_CHECK_THRESHOLD, sts.ons_byte1, sts.ons_byte2);
/*
* if the NIC went through initialization, or not set force up, need to
* re-program the filters by calling oob_nic_start().
*/
if ((sts.ons_byte1 & NIC_STATUS_D1_INIT)
|| !(sts.ons_byte1 & NIC_STATUS_D1_FORCE_UP)) {
while(oob_nic_start(nic, mac)) {
usleep(1000);
}
}
no_rcv = 0;
}
if (n_fds > 0 && FD_ISSET(fd, &rfds)) {
for (n_io = 0; n_io < 1; n_io++) {
rc = oob_intf_receive(intf, buf, sizeof(buf));
if (rc <= 0) {
break;
}
oob_nic_send(nic, buf, rc);
}
}
}
}
int main(int argc, const char **argv) {
uint8_t mac[6];
oob_nic *nic;
oob_intf *intf;
struct wedge_eeprom_st eeprom;
int rc;
int from_eeprom = 0;
nic = oob_nic_open(0, 0x49);
if (!nic) {
return -1;
}
/* read EEPROM for the MAC */
if (wedge_eeprom_parse(NULL, &eeprom) == 0) {
uint16_t carry;
int pos;
int adj;
/*
* OOB MAC comes from this range. We pick the last MAC from the range to
* use as OOB MAC.
*/
if (eeprom.fbw_mac_size > 128) {
LOG_ERR(EFAULT, "Extended MAC size (%d) is too large.",
eeprom.fbw_mac_size);
carry = 128;
} else {
carry = eeprom.fbw_mac_size;
}
/*
* Due to various manufacture issues, some FC boards have MAC range overlap
* between LEFT and RIGHT sides. A SW workaround is done below to use the
* 8th (or 7th for right side FC) last MAC from the range for FC.
*/
if (strncmp(eeprom.fbw_location, "LEFT", FBW_EEPROM_F_LOCATION) == 0) {
adj = 8;
} else if (strncmp(eeprom.fbw_location, "RIGHT", FBW_EEPROM_F_LOCATION)
== 0) {
adj = 7;
} else {
adj = 1;
}
if (carry < adj) {
LOG_ERR(EFAULT, "Invalid extended MAC size: %d", eeprom.fbw_mac_size);
} else {
carry -= adj;
memcpy(mac, eeprom.fbw_mac_base, sizeof(mac));
for (pos = sizeof(mac) - 1; pos >= 0 && carry; pos--) {
uint16_t tmp = mac[pos] + carry;
mac[pos] = tmp & 0xFF;
carry = tmp >> 8;
}
from_eeprom = 1;
}
}
if (!from_eeprom) {
while (oob_nic_get_mac(nic, mac)) {
usleep(1000);
}
/*
* increase the last byte of the mac by 1 and turn on the
* local administered bit to use it as the oob nic mac
*/
mac[0] |= 0x2;
mac[5]++;
}
LOG_INFO("Retrieve MAC %x:%x:%x:%x:%x:%x from %s",
mac[0], mac[1], mac[2], mac[3], mac[4], mac[5],
(from_eeprom) ? "EEPROM" : "NIC");
/* create the tap interface */
intf = oob_intf_create("oob", mac);
if (!intf) {
return -1;
}
while (oob_nic_start(nic, mac)) {
usleep(1000);
}
io_loop(nic, intf, mac);
return 0;
}
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