Mercurial > flash_v2

annotate packages/io/eth/current/src/net/eth_drv.c @ 117:bd1a71e3e476 ecos-sw-2000-08-25

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Merge from eCos master repository on 2000-08-25-19:22:58-BST
author jlarmour
date Fri, 25 Aug 2000 19:17:22 +0000
parents 6ed91473a1cd
children 6bd9d475ed4b
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115
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1 //==========================================================================
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2 //
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3 // ecos/eth_drv.c
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4 //
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5 // Hardware independent ethernet driver
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6 //
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7 //==========================================================================
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8 //####COPYRIGHTBEGIN####
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9 //
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10 // -------------------------------------------
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11 // The contents of this file are subject to the Red Hat eCos Public License
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12 // Version 1.1 (the "License"); you may not use this file except in
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13 // compliance with the License. You may obtain a copy of the License at
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14 // http://www.redhat.com/
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15 //
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16 // Software distributed under the License is distributed on an "AS IS"
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17 // basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See the
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18 // License for the specific language governing rights and limitations under
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19 // the License.
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20 //
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21 // The Original Code is eCos - Embedded Configurable Operating System,
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22 // released September 30, 1998.
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23 //
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24 // The Initial Developer of the Original Code is Red Hat.
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25 // Portions created by Red Hat are
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26 // Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
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27 // All Rights Reserved.
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28 // -------------------------------------------
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29 //
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30 //####COPYRIGHTEND####
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31 //####BSDCOPYRIGHTBEGIN####
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32 //
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33 // -------------------------------------------
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34 //
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35 // Portions of this software may have been derived from OpenBSD or other sources,
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36 // and are covered by the appropriate copyright disclaimers included herein.
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37 //
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38 // -------------------------------------------
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39 //
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40 //####BSDCOPYRIGHTEND####
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41 //==========================================================================
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42 //#####DESCRIPTIONBEGIN####
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43 //
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44 // Author(s): gthomas
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45 // Contributors: gthomas
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46 // Date: 2000-01-10
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47 // Purpose: Hardware independent ethernet driver
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48 // Description:
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49 //
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50 //
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51 //####DESCRIPTIONEND####
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52 //
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53 //==========================================================================
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54
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55 // High-level ethernet driver
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56
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57 #include <sys/param.h>
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58 #include <sys/errno.h>
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59 #include <sys/ioctl.h>
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60 #include <sys/mbuf.h>
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61 #include <sys/socket.h>
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62
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63 #include <net/if.h>
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64 #include <net/if_dl.h>
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65 #include <net/if_types.h>
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66 #include <net/netisr.h>
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67
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68 #ifdef INET
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69 #include <netinet/in.h>
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70 #include <netinet/in_systm.h>
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71 #include <netinet/in_var.h>
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72 #include <netinet/ip.h>
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73 #include <netinet/if_ether.h>
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74 #endif
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75
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76 #if NBPFILTER > 0
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77 #include <net/bpf.h>
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78 #include <net/bpfdesc.h>
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79 #endif
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80
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81 #include <cyg/infra/cyg_ass.h>
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82 #include <cyg/hal/drv_api.h>
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83 #include <pkgconf/hal.h>
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84 #include <cyg/hal/hal_if.h>
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85 #include <eth_drv.h>
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86
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87 static int eth_drv_ioctl(struct ifnet *, u_long, caddr_t);
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88 static void eth_drv_send(struct ifnet *);
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89
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90 extern int net_debug; // FIXME
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91
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92 // Interfaces exported to drivers
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93
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94 static void eth_drv_init(struct eth_drv_sc *sc, unsigned char *enaddr);
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95 static void eth_drv_recv(struct eth_drv_sc *sc, int total_len);
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96 static void eth_drv_tx_done(struct eth_drv_sc *sc, unsigned long key, int status);
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97
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98 struct eth_drv_funs eth_drv_funs = {eth_drv_init, eth_drv_recv, eth_drv_tx_done};
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99
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100 //
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101 // This function is called during system initialization to register a
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102 // network interface with the system.
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103 //
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104 static void
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105 eth_drv_init(struct eth_drv_sc *sc, unsigned char *enaddr)
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106 {
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107 struct ifnet *ifp = &sc->sc_arpcom.ac_if;
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108
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109 // Set up hardware address
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110 bcopy(enaddr, &sc->sc_arpcom.ac_enaddr, ETHER_ADDR_LEN);
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111
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112 // Initialize ifnet structure
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113 bcopy((void *)sc->dev_name, ifp->if_xname, IFNAMSIZ);
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114 ifp->if_softc = sc;
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115 ifp->if_start = eth_drv_send;
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116 ifp->if_ioctl = eth_drv_ioctl;
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117 ifp->if_flags =
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118 IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST;
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119 sc->state = 0;
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120
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121 // Attach the interface
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122 if_attach(ifp);
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123 ether_ifattach(ifp);
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124
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125 #ifdef CYGSEM_HAL_VIRTUAL_VECTOR_DIAG
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126 // Set up interfaces so debug environment can share this device
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127 {
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128 void *dbg = CYGACC_CALL_IF_DBG_DATA();
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129 if (!dbg) {
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130 CYGACC_CALL_IF_DBG_DATA_SET((void *)sc);
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131 }
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132 }
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133 #endif
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134 }
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135
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136 //
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137 // This [internal] function will be called to stop activity on an interface.
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138 //
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139 static void
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140 eth_drv_stop(struct eth_drv_sc *sc)
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141 {
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142 (sc->funs->stop)(sc);
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143 sc->state &= ~ETH_DRV_STATE_ACTIVE;
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144 }
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145
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146 //
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147 // This [internal] function will be called to start activity on an interface.
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148 //
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149 static void
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150 eth_drv_start(struct eth_drv_sc *sc)
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151 {
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152 struct ifnet *ifp = &sc->sc_arpcom.ac_if;
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153 // Perform any hardware initialization
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154 (sc->funs->start)(sc, (unsigned char *)&sc->sc_arpcom.ac_enaddr, 0);
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155 // Set 'running' flag, and clear output active flag.
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156 ifp->if_flags |= IFF_RUNNING;
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157 ifp->if_flags &= ~IFF_OACTIVE;
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158 sc->state |= ETH_DRV_STATE_ACTIVE;
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159 eth_drv_send(ifp); // Try and start up transmit
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160 }
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161
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162 //
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163 // This function supports "I/O control" operations on an interface.
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164 //
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165 static int
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166 eth_drv_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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167 {
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168 struct eth_drv_sc *sc = ifp->if_softc;
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169 struct ifaddr *ifa = (struct ifaddr *) data;
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170 struct ifreq *ifr = (struct ifreq *)data;
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171 int s, error = 0;
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172
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173 s = splnet();
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174
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175 if ((error = ether_ioctl(ifp, &sc->sc_arpcom, cmd, data)) > 0) {
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176 splx(s);
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177 return error;
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178 }
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179
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180 switch (cmd) {
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181
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182 case SIOCSIFADDR:
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183 ifp->if_flags |= IFF_UP;
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184
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185 switch (ifa->ifa_addr->sa_family) {
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186 #ifdef INET
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187 case AF_INET:
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188 eth_drv_start(sc);
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189 arp_ifinit(&sc->sc_arpcom, ifa);
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190 break;
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191 #endif
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192 default:
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193 eth_drv_start(sc);
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194 break;
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195 }
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196 break;
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197
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198 case SIOCGIFHWADDR:
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199 // Get hardware (MAC) address
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200 ifr->ifr_hwaddr.sa_family = AF_INET;
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201 bcopy(&sc->sc_arpcom.ac_enaddr, &ifr->ifr_hwaddr.sa_data, ETHER_ADDR_LEN);
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202 break;
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203
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204 case SIOCSIFHWADDR:
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205 // Set hardware (MAC) address
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206 bcopy(&ifr->ifr_hwaddr.sa_data, &sc->sc_arpcom.ac_enaddr, ETHER_ADDR_LEN);
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207 if ((sc->funs->control)(sc, ETH_DRV_SET_MAC_ADDRESS,
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208 &sc->sc_arpcom.ac_enaddr, ETHER_ADDR_LEN)) {
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209 error = EINVAL;
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210 }
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211 break;
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212
117
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213 #ifdef SIOCGIFSTATS
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214 case SIOCGIFSTATS:
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215 #ifdef SIOCGIFSTATSUD
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216 case SIOCGIFSTATSUD:
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217 #endif
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218 // Get interface statistics:
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219 if ((sc->funs->control)(sc, (cmd == SIOCGIFSTATS)
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220 ? ETH_DRV_GET_IF_STATS
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221 : ETH_DRV_GET_IF_STATS_UD,
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222 data, 0 ) ) {
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223 error = EINVAL;
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224 }
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225 break;
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226 #endif // SIOCGIFSTATS
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227
115
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228 case SIOCSIFFLAGS:
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229 if ((ifp->if_flags & IFF_UP) == 0 &&
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230 (ifp->if_flags & IFF_RUNNING) != 0) {
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231 /*
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232 * If interface is marked down and it is running, then
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233 * stop it.
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234 */
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235 eth_drv_stop(sc);
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236 ifp->if_flags &= ~IFF_RUNNING;
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237 } else
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238 if ((ifp->if_flags & IFF_UP) != 0 &&
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239 (ifp->if_flags & IFF_RUNNING) == 0) {
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240 /*
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241 * If interface is marked up and it is stopped, then
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242 * start it.
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243 */
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244 eth_drv_start(sc);
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245 } else {
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246 /*
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247 * Reset the interface to pick up changes in any other
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248 * flags that affect hardware registers.
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249 */
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250 eth_drv_stop(sc);
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251 eth_drv_start(sc);
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252 }
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253 break;
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254
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255 #if 0
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256 case SIOCADDMULTI:
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257 case SIOCDELMULTI:
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258 /* Update our multicast list. */
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259 error = (cmd == SIOCADDMULTI) ?
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260 ether_addmulti(ifr, &sc->sc_arpcom) :
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261 ether_delmulti(ifr, &sc->sc_arpcom);
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262
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263 if (error == ENETRESET) {
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264 /*
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265 * Multicast list has changed; set the hardware filter
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266 * accordingly.
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267 */
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268 eth_drv_stop(sc); /* XXX for ds_setmcaf? */
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269 eth_drv_start(sc);
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270 error = 0;
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271 }
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272 break;
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273 #endif
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274
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275 default:
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276 error = EINVAL;
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277 break;
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278 }
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279
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280 splx(s);
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281 return (error);
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282 }
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283
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284 //
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285 // This routine is called to start transmitting if there is data
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286 // available.
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287 //
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288 static void
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289 eth_drv_send(struct ifnet *ifp)
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290 {
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291 struct eth_drv_sc *sc = ifp->if_softc;
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292 struct eth_drv_sg sg_list[MAX_ETH_DRV_SG];
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293 int sg_len;
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294 struct mbuf *m0, *m;
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295 int len, total_len;
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296 unsigned char *data;
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297
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298 cyg_scheduler_lock(); // Prevent DSRs from running
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299 if ((ifp->if_flags & IFF_RUNNING) != IFF_RUNNING) {
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300 cyg_scheduler_unlock();
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301 return;
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302 }
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303
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304 while ((sc->funs->can_send)(sc) > 0) {
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305 IF_DEQUEUE(&ifp->if_snd, m0);
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306 if (m0 == 0) {
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307 break;
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308 }
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309
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310 if (net_debug)
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311 diag_printf("Sending %d bytes\n", m0->m_pkthdr.len);
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312
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313 /* We need to use m->m_pkthdr.len, so require the header */
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314 if ((m0->m_flags & M_PKTHDR) == 0)
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315 panic("eth_drv_send: no header mbuf");
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316
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317 #if NBPFILTER > 0
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318 /* Tap off here if there is a BPF listener. */
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319 if (ifp->if_bpf)
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320 bpf_mtap(ifp->if_bpf, m0);
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321 #endif
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322
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323 // Extract data pointers (don't actually move data here)
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324 sg_len = 0; total_len = 0;
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325 for (m = m0; m ; m = m->m_next) {
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326 data = mtod(m, u_char *);
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327 len = m->m_len;
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328 total_len += len;
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329 sg_list[sg_len].buf = (CYG_ADDRESS)data;
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330 sg_list[sg_len].len = len;
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331 if ( len )
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332 sg_len++;
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333 if (net_debug) {
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334 diag_printf("xmit %d bytes at %x sg[%d]\n", len, data, sg_len);
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335 if ( 1 & net_debug )
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336 diag_dump_buf(data, len);
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337 }
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338 if ( MAX_ETH_DRV_SG < sg_len ) {
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339 diag_printf("too many mbufs to tx, %d > %d\n", sg_len, MAX_ETH_DRV_SG );
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340 sg_len = 0;
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341 break; // drop it on the floor
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342 }
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343 }
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344
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345 // Tell hardware to send this packet
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346 if ( sg_len )
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347 (sc->funs->send)(sc, sg_list, sg_len, total_len, (unsigned long)m0);
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348 }
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349
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350 cyg_scheduler_unlock(); // Allow DSRs to run
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351 }
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352
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353 //
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354 // This function is called from the hardware driver when an output operation
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355 // has completed - i.e. the packet has been sent.
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356 //
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357 static struct mbuf *mbuf_key;
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358
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359 static void
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360 eth_drv_tx_done(struct eth_drv_sc *sc, unsigned long key, int status)
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361 {
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362 struct ifnet *ifp = &sc->sc_arpcom.ac_if;
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363 struct mbuf *m0 = (struct mbuf *)key;
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364 // Check for errors here (via 'status')
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365 // Done with packet
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366 mbuf_key = m0;
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367 m_freem(m0);
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368 // Start another if possible
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369 eth_drv_send(ifp);
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370 }
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371
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372 //
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373 // This function is called from a hardware driver to indicate that an input
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374 // packet has arrived. The routine will set up appropriate network resources
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375 // (mbuf's) to hold the data and call back into the driver to retrieve the data.
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376 //
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377 static void
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378 eth_drv_recv(struct eth_drv_sc *sc, int total_len)
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379 {
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380 struct ifnet *ifp = &sc->sc_arpcom.ac_if;
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381 struct ether_header _eh, *eh=&_eh;
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382 struct mbuf *top, **mp, *m;
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383 int i, mlen;
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384 unsigned char *data;
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385 struct eth_drv_sg sg_list[MAX_ETH_DRV_SG];
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386 int sg_len;
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387
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388 if ((ifp->if_flags & IFF_RUNNING) != IFF_RUNNING) {
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389 return; // Interface not up, ignore this request
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390 }
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391
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392 CYG_ASSERT( 0 != total_len, "total_len is zero!" );
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393 CYG_ASSERT( 0 <= total_len, "total_len is negative!" );
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394 CYG_ASSERT( sizeof( struct ether_header ) <= total_len,
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395 "No ether header here!" );
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396
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397 if ( total_len < sizeof( struct ether_header ) )
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398 // Our arithmetic below would go wrong
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399 return;
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400
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401 /* Pull packet off interface. */
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402 MGETHDR(m, M_DONTWAIT, MT_DATA);
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403 if (m == 0) {
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404 diag_printf("warning: eth_recv out of MBUFs\n");
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405 }
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406
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407 // Set up buffers
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408 // Unload ethernet header separately so IP/UDP/TCP headers are aligned
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409 sg_list[0].buf = (CYG_ADDRESS)eh;
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410 sg_list[0].len = sizeof(*eh);
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411 sg_len = 1;
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412
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413 // Compute total length (minus ethernet header)
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414 total_len -= sizeof(*eh);
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415
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416 top = 0;
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417 mlen = MHLEN;
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418 mp = &top;
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419
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420 if (m) {
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421 m->m_pkthdr.rcvif = ifp;
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422 m->m_pkthdr.len = total_len;
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423 } else {
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424 sg_list[sg_len].buf = (CYG_ADDRESS)0;
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425 sg_list[sg_len].len = min(total_len, MCLBYTES);
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426 sg_len++;
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427 total_len = 0;
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428 }
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429
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430 while (total_len > 0) {
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431 if (top) {
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432 MGET(m, M_DONTWAIT, MT_DATA);
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433 if (m == 0) {
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434 m_freem(top);
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435 panic("out of MBUFs [2]");
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436 }
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437 mlen = MLEN;
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438 }
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439 if (total_len >= MINCLSIZE) {
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440 MCLGET(m, M_DONTWAIT);
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441 if ((m->m_flags & M_EXT) == 0) {
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442 m_freem(top);
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443 diag_printf("warning: eth_recv out of MBUFs\n");
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444 sg_list[sg_len].buf = (CYG_ADDRESS)0;
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445 sg_list[sg_len].len = min(total_len, MCLBYTES);
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446 sg_len++;
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447 top = 0;
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448 break;
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449 }
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450 mlen = MCLBYTES;
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451 }
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452 m->m_len = mlen = min(total_len, mlen);
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453 total_len -= mlen;
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454 data = mtod(m, caddr_t);
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455 sg_list[sg_len].buf = (CYG_ADDRESS)data;
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456 sg_list[sg_len].len = mlen;
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457 sg_len++;
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458 *mp = m;
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459 mp = &m->m_next;
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460 }
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461
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462 // Ask hardware to unload buffers
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463 (sc->funs->recv)(sc, sg_list, sg_len);
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464
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465 if (net_debug) {
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466 for (i = 0; i < sg_len; i++) {
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467 if (sg_list[i].buf) {
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468 diag_printf("rx %d bytes at %x sg[%d]\n", sg_list[i].len, sg_list[i].buf, i);
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469 if ( 1 & net_debug )
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470 diag_dump_buf((void *)sg_list[i].buf, sg_list[i].len);
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471 }
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472 }
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473 }
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474
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475 m = top;
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476 if (m == 0) {
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477 ifp->if_ierrors++;
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478 return;
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479 }
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480
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481 ifp->if_ipackets++;
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482
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483
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484 #if NBPFILTER > 0
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485 #error FIXME - Need mbuf with ethernet header attached
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486 /*
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487 * Check if there's a BPF listener on this interface.
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488 * If so, hand off the raw packet to bpf.
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489 */
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490 if (ifp->if_bpf)
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491 bpf_mtap(ifp->if_bpf, m);
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492 #endif
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493
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494 // Push data into protocol stacks
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495 ether_input(ifp, eh, m);
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496 }
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497
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498 #ifdef CYGPKG_IO_PCMCIA
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499 // Lookup a 'netdev' entry, assuming that it is an ethernet device.
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500 cyg_netdevtab_entry_t *
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501 eth_drv_netdev(char *name)
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502 {
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503 cyg_netdevtab_entry_t *t;
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504 struct eth_drv_sc *sc;
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505 for (t = &__NETDEVTAB__[0]; t != &__NETDEVTAB_END__; t++) {
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506 sc = (struct eth_drv_sc *)t->device_instance;
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507 if (strcmp(sc->dev_name, name) == 0) {
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508 return t;
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509 }
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510 }
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511 return (cyg_netdevtab_entry_t *)NULL;
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512 }
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513 #endif // CYGPKG_IO_PCMCIA
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514
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515 // EOF eth_drv.c