| 1 |
/* |
| 2 |
* ether_linux.cpp - SheepShaver Ethernet Device Driver (DLPI), Linux specific stuff |
| 3 |
* |
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* SheepShaver (C) 1997-2002 Marc Hellwig and Christian Bauer |
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* |
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* This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License as published by |
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* the Free Software Foundation; either version 2 of the License, or |
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* (at your option) any later version. |
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* |
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* This program is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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* GNU General Public License for more details. |
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* |
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* You should have received a copy of the GNU General Public License |
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* along with this program; if not, write to the Free Software |
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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|
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#include <pthread.h> |
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#include <semaphore.h> |
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#include <unistd.h> |
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#include <fcntl.h> |
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#include <errno.h> |
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#include <sys/ioctl.h> |
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#include <sys/poll.h> |
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#include <stdio.h> |
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#include <string.h> |
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|
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#include "sysdeps.h" |
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#include "main.h" |
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#include "macos_util.h" |
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#include "prefs.h" |
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#include "user_strings.h" |
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#include "ether.h" |
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#include "ether_defs.h" |
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|
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#define DEBUG 0 |
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#include "debug.h" |
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|
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#define STATISTICS 0 |
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#define MONITOR 0 |
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|
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|
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// Global variables |
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static int fd = -1; // fd of sheep_net device |
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|
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static pthread_t ether_thread; // Packet reception thread |
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static bool thread_active = false; // Flag: Packet reception thread installed |
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|
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static sem_t int_ack; // Interrupt acknowledge semaphore |
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static uint8 ether_addr[6]; // Our Ethernet address |
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|
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static bool net_open = false; // Flag: initialization succeeded, network device open |
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static bool is_ethertap = false; // Flag: Ethernet device is ethertap |
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|
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|
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// Prototypes |
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static void *receive_func(void *arg); |
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|
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|
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/* |
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* Initialize ethernet |
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*/ |
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|
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void EtherInit(void) |
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{ |
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int nonblock = 1; |
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char str[256]; |
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|
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// Do nothing if the user disabled the network |
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if (PrefsFindBool("nonet")) |
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return; |
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|
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// Do nothing if no Ethernet device specified |
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const char *name = PrefsFindString("ether"); |
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if (name == NULL) |
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return; |
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|
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// Is it Ethertap? |
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is_ethertap = (strncmp(name, "tap", 3) == 0); |
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|
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// Open sheep_net or ethertap device |
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char dev_name[16]; |
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if (is_ethertap) |
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sprintf(dev_name, "/dev/%s", name); |
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else |
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strcpy(dev_name, "/dev/sheep_net"); |
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fd = open(dev_name, O_RDWR); |
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if (fd < 0) { |
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sprintf(str, GetString(STR_NO_SHEEP_NET_DRIVER_WARN), dev_name, strerror(errno)); |
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WarningAlert(str); |
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goto open_error; |
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} |
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|
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// Attach to selected Ethernet card |
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if (!is_ethertap && ioctl(fd, SIOCSIFLINK, name) < 0) { |
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sprintf(str, GetString(STR_SHEEP_NET_ATTACH_WARN), strerror(errno)); |
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WarningAlert(str); |
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goto open_error; |
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} |
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|
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// Set nonblocking I/O |
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ioctl(fd, FIONBIO, &nonblock); |
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|
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// Get Ethernet address |
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if (is_ethertap) { |
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pid_t p = getpid(); // If configured for multicast, ethertap requires that the lower 32 bit of the Ethernet address are our PID |
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ether_addr[0] = 0xfe; |
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ether_addr[1] = 0xfd; |
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ether_addr[2] = p >> 24; |
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ether_addr[3] = p >> 16; |
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ether_addr[4] = p >> 8; |
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ether_addr[5] = p; |
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} else |
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ioctl(fd, SIOCGIFADDR, ether_addr); |
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D(bug("Ethernet address %02x %02x %02x %02x %02x %02x\n", ether_addr[0], ether_addr[1], ether_addr[2], ether_addr[3], ether_addr[4], ether_addr[5])); |
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|
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// Start packet reception thread |
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if (sem_init(&int_ack, 0, 0) < 0) { |
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WarningAlert("WARNING: Cannot init semaphore"); |
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goto open_error; |
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} |
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thread_active = (pthread_create(ðer_thread, NULL, receive_func, NULL) == 0); |
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if (!thread_active) { |
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WarningAlert("WARNING: Cannot start Ethernet thread"); |
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goto open_error; |
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} |
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|
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// Everything OK |
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net_open = true; |
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return; |
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|
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open_error: |
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if (thread_active) { |
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pthread_cancel(ether_thread); |
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pthread_join(ether_thread, NULL); |
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sem_destroy(&int_ack); |
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thread_active = false; |
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} |
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if (fd > 0) { |
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close(fd); |
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fd = -1; |
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} |
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} |
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|
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|
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/* |
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* Exit ethernet |
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*/ |
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|
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void EtherExit(void) |
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{ |
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// Stop reception thread |
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if (thread_active) { |
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pthread_cancel(ether_thread); |
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pthread_join(ether_thread, NULL); |
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sem_destroy(&int_ack); |
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thread_active = false; |
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} |
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|
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// Close sheep_net device |
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if (fd > 0) |
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close(fd); |
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|
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#if STATISTICS |
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// Show statistics |
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printf("%ld messages put on write queue\n", num_wput); |
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printf("%ld error acks\n", num_error_acks); |
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printf("%ld packets transmitted (%ld raw, %ld normal)\n", num_tx_packets, num_tx_raw_packets, num_tx_normal_packets); |
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printf("%ld tx packets dropped because buffer full\n", num_tx_buffer_full); |
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printf("%ld packets received\n", num_rx_packets); |
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printf("%ld packets passed upstream (%ld Fast Path, %ld normal)\n", num_rx_fastpath + num_unitdata_ind, num_rx_fastpath, num_unitdata_ind); |
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printf("EtherIRQ called %ld times\n", num_ether_irq); |
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printf("%ld rx packets dropped due to low memory\n", num_rx_no_mem); |
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printf("%ld rx packets dropped because no stream found\n", num_rx_dropped); |
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printf("%ld rx packets dropped because stream not ready\n", num_rx_stream_not_ready); |
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printf("%ld rx packets dropped because no memory for unitdata_ind\n", num_rx_no_unitdata_mem); |
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#endif |
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} |
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|
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|
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/* |
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* Get ethernet hardware address |
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*/ |
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|
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void AO_get_ethernet_address(uint8 *addr) |
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{ |
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if (net_open) { |
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OTCopy48BitAddress(ether_addr, addr); |
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} else { |
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addr[0] = 0x12; |
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addr[1] = 0x34; |
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addr[2] = 0x56; |
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addr[3] = 0x78; |
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addr[4] = 0x9a; |
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addr[5] = 0xbc; |
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} |
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D(bug("AO_get_ethernet_address: got address %02x%02x%02x%02x%02x%02x\n", addr[0], addr[1], addr[2], addr[3], addr[4], addr[5])); |
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} |
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|
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|
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/* |
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* Enable multicast address |
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*/ |
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|
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void AO_enable_multicast(uint8 *addr) |
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{ |
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D(bug("AO_enable_multicast\n")); |
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if (net_open) { |
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if (ioctl(fd, SIOCADDMULTI, addr) < 0) { |
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D(bug("WARNING: couldn't enable multicast address\n")); |
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} |
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} |
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} |
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|
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|
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/* |
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* Disable multicast address |
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*/ |
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|
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void AO_disable_multicast(uint8 *addr) |
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{ |
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D(bug("AO_disable_multicast\n")); |
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if (net_open) { |
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if (ioctl(fd, SIOCDELMULTI, addr) < 0) { |
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D(bug("WARNING: couldn't disable multicast address\n")); |
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} |
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} |
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} |
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|
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|
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/* |
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* Transmit one packet |
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*/ |
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|
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void AO_transmit_packet(mblk_t *mp) |
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{ |
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D(bug("AO_transmit_packet\n")); |
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if (net_open) { |
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|
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// Copy packet to buffer |
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uint8 packet[1516], *p = packet; |
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int len = 0; |
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if (is_ethertap) { |
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*p++ = 0; // Ethertap discards the first 2 bytes |
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*p++ = 0; |
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len += 2; |
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} |
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while (mp) { |
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uint32 size = mp->b_wptr - mp->b_rptr; |
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memcpy(p, mp->b_rptr, size); |
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len += size; |
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p += size; |
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mp = mp->b_cont; |
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} |
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|
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#if MONITOR |
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bug("Sending Ethernet packet:\n"); |
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for (int i=0; i<len; i++) { |
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bug("%02x ", packet[i]); |
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} |
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bug("\n"); |
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#endif |
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|
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// Transmit packet |
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if (write(fd, packet, len) < 0) { |
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D(bug("WARNING: couldn't transmit packet\n")); |
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num_tx_buffer_full++; |
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} else |
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num_tx_packets++; |
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} |
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} |
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|
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|
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/* |
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* Packet reception thread |
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*/ |
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|
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static void *receive_func(void *arg) |
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{ |
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for (;;) { |
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|
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// Wait for packets to arrive |
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struct pollfd pf = {fd, POLLIN, 0}; |
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int res = poll(&pf, 1, -1); |
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if (res <= 0) |
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break; |
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|
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if (ether_driver_opened) { |
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// Trigger Ethernet interrupt |
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D(bug(" packet received, triggering Ethernet interrupt\n")); |
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SetInterruptFlag(INTFLAG_ETHER); |
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TriggerInterrupt(); |
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|
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// Wait for interrupt acknowledge by EtherInterrupt() |
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sem_wait(&int_ack); |
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} else |
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usleep(20000); |
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} |
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return NULL; |
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} |
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|
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|
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/* |
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* Ethernet interrupt |
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*/ |
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|
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void EtherIRQ(void) |
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{ |
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D(bug("EtherIRQ\n")); |
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num_ether_irq++; |
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OTEnterInterrupt(); |
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|
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// Send received packets to OpenTransport |
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uint8 packet[1516]; |
| 318 |
for (;;) { |
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|
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if (is_ethertap) { |
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|
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// Read packet from ethertap device |
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ssize_t size = read(fd, packet, 1516); |
| 324 |
if (size < 14) |
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break; |
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|
| 327 |
#if MONITOR |
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bug("Receiving Ethernet packet:\n"); |
| 329 |
for (int i=0; i<size; i++) { |
| 330 |
bug("%02x ", packet[i]); |
| 331 |
} |
| 332 |
bug("\n"); |
| 333 |
#endif |
| 334 |
|
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// Pointer to packet data (Ethernet header) |
| 336 |
uint8 *p = packet + 2; // Ethertap has two random bytes before the packet |
| 337 |
size -= 2; |
| 338 |
|
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// Wrap packet in message block |
| 340 |
num_rx_packets++; |
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mblk_t *mp; |
| 342 |
if ((mp = allocb(size, 0)) != NULL) { |
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D(bug(" packet data at %p\n", mp->b_rptr)); |
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memcpy(mp->b_rptr, p, size); |
| 345 |
mp->b_wptr += size; |
| 346 |
ether_packet_received(mp); |
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} else { |
| 348 |
D(bug("WARNING: Cannot allocate mblk for received packet\n")); |
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num_rx_no_mem++; |
| 350 |
} |
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|
| 352 |
} else { |
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|
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// Get size of first packet |
| 355 |
int size = 0; |
| 356 |
if (ioctl(fd, FIONREAD, &size) < 0 || size == 0) |
| 357 |
break; |
| 358 |
|
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// Discard packets which are too short |
| 360 |
if (size < 14) { |
| 361 |
uint8 dummy[14]; |
| 362 |
read(fd, dummy, size); |
| 363 |
continue; |
| 364 |
} |
| 365 |
|
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// Truncate packets which are too long |
| 367 |
if (size > 1514) |
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size = 1514; |
| 369 |
|
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// Read packet and wrap it in message block |
| 371 |
num_rx_packets++; |
| 372 |
mblk_t *mp; |
| 373 |
if ((mp = allocb(size, 0)) != NULL) { |
| 374 |
D(bug(" packet data at %p\n", mp->b_rptr)); |
| 375 |
read(fd, mp->b_rptr, 1514); |
| 376 |
#if MONITOR |
| 377 |
bug("Receiving Ethernet packet:\n"); |
| 378 |
for (int i=0; i<size; i++) { |
| 379 |
bug("%02x ", ((uint8 *)mp->b_rptr)[i]); |
| 380 |
} |
| 381 |
bug("\n"); |
| 382 |
#endif |
| 383 |
mp->b_wptr += size; |
| 384 |
ether_packet_received(mp); |
| 385 |
} else { |
| 386 |
D(bug("WARNING: Cannot allocate mblk for received packet\n")); |
| 387 |
num_rx_no_mem++; |
| 388 |
} |
| 389 |
} |
| 390 |
} |
| 391 |
OTLeaveInterrupt(); |
| 392 |
|
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// Acknowledge interrupt to reception thread |
| 394 |
D(bug(" EtherIRQ done\n")); |
| 395 |
sem_post(&int_ack); |
| 396 |
} |
