hw/net/e1000x_common.c

   1 /*
   2 * QEMU e1000(e) emulation - shared code
   3 *
   4 * Copyright (c) 2008 Qumranet
   5 *
   6 * Based on work done by:
   7 * Nir Peleg, Tutis Systems Ltd. for Qumranet Inc.
   8 * Copyright (c) 2007 Dan Aloni
   9 * Copyright (c) 2004 Antony T Curtis
  10 *
  11 * This library is free software; you can redistribute it and/or
  12 * modify it under the terms of the GNU Lesser General Public
  13 * License as published by the Free Software Foundation; either
  14 * version 2 of the License, or (at your option) any later version.
  15 *
  16 * This library is distributed in the hope that it will be useful,
  17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19 * Lesser General Public License for more details.
  20 *
  21 * You should have received a copy of the GNU Lesser General Public
  22 * License along with this library; if not, see <http://www.gnu.org/licenses/>.
  23 */
  24
  25 #include "qemu/osdep.h"
  26 #include "qemu/units.h"
  27 #include "hw/pci/pci.h"
  28 #include "net/net.h"
  29
  30 #include "e1000x_common.h"
  31
  32 #include "trace.h"
  33
  34 bool e1000x_rx_ready(PCIDevice *d, uint32_t *mac)
  35 {
  36     bool link_up = mac[STATUS] & E1000_STATUS_LU;
  37     bool rx_enabled = mac[RCTL] & E1000_RCTL_EN;
  38     bool pci_master = d->config[PCI_COMMAND] & PCI_COMMAND_MASTER;
  39
  40     if (!link_up || !rx_enabled || !pci_master) {
  41         trace_e1000x_rx_can_recv_disabled(link_up, rx_enabled, pci_master);
  42         return false;
  43     }
  44
  45     return true;
  46 }
  47
  48 bool e1000x_is_vlan_packet(const uint8_t *buf, uint16_t vet)
  49 {
  50     uint16_t eth_proto = lduw_be_p(buf + 12);
  51     bool res = (eth_proto == vet);
  52
  53     trace_e1000x_vlan_is_vlan_pkt(res, eth_proto, vet);
  54
  55     return res;
  56 }
  57
  58 bool e1000x_rx_group_filter(uint32_t *mac, const uint8_t *buf)
  59 {
  60     static const int mta_shift[] = { 4, 3, 2, 0 };
  61     uint32_t f, ra[2], *rp, rctl = mac[RCTL];
  62
  63     for (rp = mac + RA; rp < mac + RA + 32; rp += 2) {
  64         if (!(rp[1] & E1000_RAH_AV)) {
  65             continue;
  66         }
  67         ra[0] = cpu_to_le32(rp[0]);
  68         ra[1] = cpu_to_le32(rp[1]);
  69         if (!memcmp(buf, (uint8_t *)ra, 6)) {
  70             trace_e1000x_rx_flt_ucast_match((int)(rp - mac - RA) / 2,
  71                                             MAC_ARG(buf));
  72             return true;
  73         }
  74     }
  75     trace_e1000x_rx_flt_ucast_mismatch(MAC_ARG(buf));
  76
  77     f = mta_shift[(rctl >> E1000_RCTL_MO_SHIFT) & 3];
  78     f = (((buf[5] << 8) | buf[4]) >> f) & 0xfff;
  79     if (mac[MTA + (f >> 5)] & (1 << (f & 0x1f))) {
  80         e1000x_inc_reg_if_not_full(mac, MPRC);
  81         return true;
  82     }
  83
  84     trace_e1000x_rx_flt_inexact_mismatch(MAC_ARG(buf),
  85                                          (rctl >> E1000_RCTL_MO_SHIFT) & 3,
  86                                          f >> 5,
  87                                          mac[MTA + (f >> 5)]);
  88
  89     return false;
  90 }
  91
  92 bool e1000x_hw_rx_enabled(uint32_t *mac)
  93 {
  94     if (!(mac[STATUS] & E1000_STATUS_LU)) {
  95         trace_e1000x_rx_link_down(mac[STATUS]);
  96         return false;
  97     }
  98
  99     if (!(mac[RCTL] & E1000_RCTL_EN)) {
 100         trace_e1000x_rx_disabled(mac[RCTL]);
 101         return false;
 102     }
 103
 104     return true;
 105 }
 106
 107 bool e1000x_is_oversized(uint32_t *mac, size_t size)
 108 {
 109     /* this is the size past which hardware will
 110        drop packets when setting LPE=0 */
 111     static const int maximum_ethernet_vlan_size = 1522;
 112     /* this is the size past which hardware will
 113        drop packets when setting LPE=1 */
 114     static const int maximum_ethernet_lpe_size = 16 * KiB;
 115
 116     if ((size > maximum_ethernet_lpe_size ||
 117         (size > maximum_ethernet_vlan_size
 118             && !(mac[RCTL] & E1000_RCTL_LPE)))
 119         && !(mac[RCTL] & E1000_RCTL_SBP)) {
 120         e1000x_inc_reg_if_not_full(mac, ROC);
 121         trace_e1000x_rx_oversized(size);
 122         return true;
 123     }
 124
 125     return false;
 126 }
 127
 128 void e1000x_restart_autoneg(uint32_t *mac, uint16_t *phy, QEMUTimer *timer)
 129 {
 130     e1000x_update_regs_on_link_down(mac, phy);
 131     trace_e1000x_link_negotiation_start();
 132     timer_mod(timer, qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) + 500);
 133 }
 134
 135 void e1000x_reset_mac_addr(NICState *nic, uint32_t *mac_regs,
 136                            uint8_t *mac_addr)
 137 {
 138     int i;
 139
 140     mac_regs[RA] = 0;
 141     mac_regs[RA + 1] = E1000_RAH_AV;
 142     for (i = 0; i < 4; i++) {
 143         mac_regs[RA] |= mac_addr[i] << (8 * i);
 144         mac_regs[RA + 1] |=
 145             (i < 2) ? mac_addr[i + 4] << (8 * i) : 0;
 146     }
 147
 148     qemu_format_nic_info_str(qemu_get_queue(nic), mac_addr);
 149     trace_e1000x_mac_indicate(MAC_ARG(mac_addr));
 150 }
 151
 152 void e1000x_update_regs_on_autoneg_done(uint32_t *mac, uint16_t *phy)
 153 {
 154     e1000x_update_regs_on_link_up(mac, phy);
 155     phy[PHY_LP_ABILITY] |= MII_LPAR_LPACK;
 156     phy[PHY_STATUS] |= MII_SR_AUTONEG_COMPLETE;
 157     trace_e1000x_link_negotiation_done();
 158 }
 159
 160 void
 161 e1000x_core_prepare_eeprom(uint16_t       *eeprom,
 162                            const uint16_t *templ,
 163                            uint32_t        templ_size,
 164                            uint16_t        dev_id,
 165                            const uint8_t  *macaddr)
 166 {
 167     uint16_t checksum = 0;
 168     int i;
 169
 170     memmove(eeprom, templ, templ_size);
 171
 172     for (i = 0; i < 3; i++) {
 173         eeprom[i] = (macaddr[2 * i + 1] << 8) | macaddr[2 * i];
 174     }
 175
 176     eeprom[11] = eeprom[13] = dev_id;
 177
 178     for (i = 0; i < EEPROM_CHECKSUM_REG; i++) {
 179         checksum += eeprom[i];
 180     }
 181
 182     checksum = (uint16_t) EEPROM_SUM - checksum;
 183
 184     eeprom[EEPROM_CHECKSUM_REG] = checksum;
 185 }
 186
 187 uint32_t
 188 e1000x_rxbufsize(uint32_t rctl)
 189 {
 190     rctl &= E1000_RCTL_BSEX | E1000_RCTL_SZ_16384 | E1000_RCTL_SZ_8192 |
 191         E1000_RCTL_SZ_4096 | E1000_RCTL_SZ_2048 | E1000_RCTL_SZ_1024 |
 192         E1000_RCTL_SZ_512 | E1000_RCTL_SZ_256;
 193     switch (rctl) {
 194     case E1000_RCTL_BSEX | E1000_RCTL_SZ_16384:
 195         return 16384;
 196     case E1000_RCTL_BSEX | E1000_RCTL_SZ_8192:
 197         return 8192;
 198     case E1000_RCTL_BSEX | E1000_RCTL_SZ_4096:
 199         return 4096;
 200     case E1000_RCTL_SZ_1024:
 201         return 1024;
 202     case E1000_RCTL_SZ_512:
 203         return 512;
 204     case E1000_RCTL_SZ_256:
 205         return 256;
 206     }
 207     return 2048;
 208 }
 209
 210 void
 211 e1000x_update_rx_total_stats(uint32_t *mac,
 212                              size_t data_size,
 213                              size_t data_fcs_size)
 214 {
 215     static const int PRCregs[6] = { PRC64, PRC127, PRC255, PRC511,
 216                                     PRC1023, PRC1522 };
 217
 218     e1000x_increase_size_stats(mac, PRCregs, data_fcs_size);
 219     e1000x_inc_reg_if_not_full(mac, TPR);
 220     mac[GPRC] = mac[TPR];
 221     /* TOR - Total Octets Received:
 222     * This register includes bytes received in a packet from the <Destination
 223     * Address> field through the <CRC> field, inclusively.
 224     * Always include FCS length (4) in size.
 225     */
 226     e1000x_grow_8reg_if_not_full(mac, TORL, data_size + 4);
 227     mac[GORCL] = mac[TORL];
 228     mac[GORCH] = mac[TORH];
 229 }
 230
 231 void
 232 e1000x_increase_size_stats(uint32_t *mac, const int *size_regs, int size)
 233 {
 234     if (size > 1023) {
 235         e1000x_inc_reg_if_not_full(mac, size_regs[5]);
 236     } else if (size > 511) {
 237         e1000x_inc_reg_if_not_full(mac, size_regs[4]);
 238     } else if (size > 255) {
 239         e1000x_inc_reg_if_not_full(mac, size_regs[3]);
 240     } else if (size > 127) {
 241         e1000x_inc_reg_if_not_full(mac, size_regs[2]);
 242     } else if (size > 64) {
 243         e1000x_inc_reg_if_not_full(mac, size_regs[1]);
 244     } else if (size == 64) {
 245         e1000x_inc_reg_if_not_full(mac, size_regs[0]);
 246     }
 247 }
 248
 249 void
 250 e1000x_read_tx_ctx_descr(struct e1000_context_desc *d,
 251                          e1000x_txd_props *props)
 252 {
 253     uint32_t op = le32_to_cpu(d->cmd_and_length);
 254
 255     props->ipcss = d->lower_setup.ip_fields.ipcss;
 256     props->ipcso = d->lower_setup.ip_fields.ipcso;
 257     props->ipcse = le16_to_cpu(d->lower_setup.ip_fields.ipcse);
 258     props->tucss = d->upper_setup.tcp_fields.tucss;
 259     props->tucso = d->upper_setup.tcp_fields.tucso;
 260     props->tucse = le16_to_cpu(d->upper_setup.tcp_fields.tucse);
 261     props->paylen = op & 0xfffff;
 262     props->hdr_len = d->tcp_seg_setup.fields.hdr_len;
 263     props->mss = le16_to_cpu(d->tcp_seg_setup.fields.mss);
 264     props->ip = (op & E1000_TXD_CMD_IP) ? 1 : 0;
 265     props->tcp = (op & E1000_TXD_CMD_TCP) ? 1 : 0;
 266     props->tse = (op & E1000_TXD_CMD_TSE) ? 1 : 0;
 267 }