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annotate packages/net/drivers/eth/common/current/src/eth_drv.c @ 103:95f3e12a6327 ecos-sw-2000-06-23

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Merge from eCos master repository on 2000-06-23-16:41:10-BST
author jlarmour
date Fri, 23 Jun 2000 17:06:31 +0000
parents ced4577552cd
children 84e4bde58b26
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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/hal/drv_api.h>
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82 #include <eth_drv.h>
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83
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84 static int eth_drv_ioctl(struct ifnet *, u_long, caddr_t);
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85 static void eth_drv_send(struct ifnet *);
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86
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87 extern int net_debug; // FIXME
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88
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89 //
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90 // This function is called during system initialization to register a
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91 // network interface with the system.
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92 //
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93 void
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94 eth_drv_init(struct eth_drv_sc *sc, unsigned char *enaddr)
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95 {
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96 struct ifnet *ifp = &sc->sc_arpcom.ac_if;
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97
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98 // Set up hardware address
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99 bcopy(enaddr, &sc->sc_arpcom.ac_enaddr, ETHER_ADDR_LEN);
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100
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101 // Initialize ifnet structure
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102 bcopy((void *)sc->dev_name, ifp->if_xname, IFNAMSIZ);
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103 ifp->if_softc = sc;
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104 ifp->if_start = eth_drv_send;
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105 ifp->if_ioctl = eth_drv_ioctl;
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106 ifp->if_flags =
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107 IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS | IFF_MULTICAST;
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108
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109 // Attach the interface
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110 if_attach(ifp);
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111 ether_ifattach(ifp);
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112 }
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113
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114 //
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115 // This [internal] function will be called to stop activity on an interface.
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116 //
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117 static void
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118 eth_drv_stop(struct eth_drv_sc *sc)
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119 {
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120 (sc->funs->stop)(sc);
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121 }
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122
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123 //
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124 // This [internal] function will be called to start activity on an interface.
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125 //
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126 static void
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127 eth_drv_start(struct eth_drv_sc *sc)
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128 {
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129 struct ifnet *ifp = &sc->sc_arpcom.ac_if;
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130 // Perform any hardware initialization
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131 (sc->funs->start)(sc, (unsigned char *)&sc->sc_arpcom.ac_enaddr, 0);
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132 // Set 'running' flag, and clear output active flag.
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133 ifp->if_flags |= IFF_RUNNING;
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134 ifp->if_flags &= ~IFF_OACTIVE;
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135 eth_drv_send(ifp); // Try and start up transmit
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136 }
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137
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138 //
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139 // This function supports "I/O control" operations on an interface.
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140 //
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141 static int
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142 eth_drv_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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143 {
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144 struct eth_drv_sc *sc = ifp->if_softc;
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145 struct ifaddr *ifa = (struct ifaddr *) data;
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146 struct ifreq *ifr = (struct ifreq *)data;
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147 int s, error = 0;
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148
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149 s = splnet();
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150
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151 if ((error = ether_ioctl(ifp, &sc->sc_arpcom, cmd, data)) > 0) {
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diff changeset
152 splx(s);
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153 return error;
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154 }
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diff changeset
155
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diff changeset
156 switch (cmd) {
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157
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158 case SIOCSIFADDR:
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159 ifp->if_flags |= IFF_UP;
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160
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161 switch (ifa->ifa_addr->sa_family) {
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162 #ifdef INET
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163 case AF_INET:
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164 eth_drv_start(sc);
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165 arp_ifinit(&sc->sc_arpcom, ifa);
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166 break;
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167 #endif
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168 default:
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169 eth_drv_start(sc);
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170 break;
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171 }
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172 break;
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173
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174 case SIOCGIFHWADDR:
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175 // Get hardware (MAC) address
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176 ifr->ifr_hwaddr.sa_family = AF_INET;
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177 bcopy(&sc->sc_arpcom.ac_enaddr, &ifr->ifr_hwaddr.sa_data, ETHER_ADDR_LEN);
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178 break;
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179
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180 case SIOCSIFHWADDR:
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181 // Set hardware (MAC) address
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182 bcopy(&ifr->ifr_hwaddr.sa_data, &sc->sc_arpcom.ac_enaddr, ETHER_ADDR_LEN);
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183 if ((sc->funs->control)(sc, ETH_DRV_SET_MAC_ADDRESS,
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184 &sc->sc_arpcom.ac_enaddr, ETHER_ADDR_LEN)) {
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185 error = EINVAL;
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186 }
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187 break;
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188
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189 case SIOCSIFFLAGS:
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190 if ((ifp->if_flags & IFF_UP) == 0 &&
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191 (ifp->if_flags & IFF_RUNNING) != 0) {
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192 /*
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193 * If interface is marked down and it is running, then
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194 * stop it.
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195 */
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196 eth_drv_stop(sc);
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197 ifp->if_flags &= ~IFF_RUNNING;
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198 } else
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199 if ((ifp->if_flags & IFF_UP) != 0 &&
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200 (ifp->if_flags & IFF_RUNNING) == 0) {
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201 /*
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202 * If interface is marked up and it is stopped, then
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203 * start it.
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204 */
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205 eth_drv_start(sc);
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206 } else {
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207 /*
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208 * Reset the interface to pick up changes in any other
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209 * flags that affect hardware registers.
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210 */
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211 eth_drv_stop(sc);
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212 eth_drv_start(sc);
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213 }
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214 break;
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215
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216 #if 0
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217 case SIOCADDMULTI:
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218 case SIOCDELMULTI:
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219 /* Update our multicast list. */
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220 error = (cmd == SIOCADDMULTI) ?
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221 ether_addmulti(ifr, &sc->sc_arpcom) :
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222 ether_delmulti(ifr, &sc->sc_arpcom);
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223
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224 if (error == ENETRESET) {
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225 /*
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226 * Multicast list has changed; set the hardware filter
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227 * accordingly.
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228 */
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229 eth_drv_stop(sc); /* XXX for ds_setmcaf? */
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230 eth_drv_start(sc);
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231 error = 0;
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232 }
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233 break;
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234 #endif
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235
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236 default:
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237 error = EINVAL;
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238 break;
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239 }
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240
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diff changeset
241 splx(s);
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diff changeset
242 return (error);
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diff changeset
243 }
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244
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245 //
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246 // This routine is called to start transmitting if there is data
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diff changeset
247 // available.
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diff changeset
248 //
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249 static void
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diff changeset
250 eth_drv_send(struct ifnet *ifp)
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diff changeset
251 {
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diff changeset
252 struct eth_drv_sc *sc = ifp->if_softc;
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253 struct eth_drv_sg sg_list[MAX_ETH_DRV_SG];
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diff changeset
254 int sg_len;
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255 struct mbuf *m0, *m;
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diff changeset
256 int len, total_len;
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diff changeset
257 unsigned char *data;
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diff changeset
258
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259 cyg_scheduler_lock(); // Prevent DSRs from running
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260 if ((ifp->if_flags & IFF_RUNNING) != IFF_RUNNING) {
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diff changeset
261 cyg_scheduler_unlock();
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262 return;
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diff changeset
263 }
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diff changeset
264
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diff changeset
265 while ((sc->funs->can_send)(sc) > 0) {
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266 IF_DEQUEUE(&ifp->if_snd, m0);
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diff changeset
267 if (m0 == 0) {
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268 break;
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diff changeset
269 }
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diff changeset
270
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diff changeset
271 if (net_debug)
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272 diag_printf("Sending %d bytes\n", m0->m_pkthdr.len);
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273
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274 /* We need to use m->m_pkthdr.len, so require the header */
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275 if ((m0->m_flags & M_PKTHDR) == 0)
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276 panic("eth_drv_send: no header mbuf");
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diff changeset
277
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diff changeset
278 #if NBPFILTER > 0
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279 /* Tap off here if there is a BPF listener. */
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diff changeset
280 if (ifp->if_bpf)
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281 bpf_mtap(ifp->if_bpf, m0);
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diff changeset
282 #endif
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diff changeset
283
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284 // Extract data pointers (don't actually move data here)
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285 sg_len = 0; total_len = 0;
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diff changeset
286 for (m = m0; m ; m = m->m_next) {
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diff changeset
287 data = mtod(m, u_char *);
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288 len = m->m_len;
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289 total_len += len;
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290 sg_list[sg_len].buf = (CYG_ADDRESS)data;
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291 sg_list[sg_len].len = len;
103
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parents: 97
diff changeset
292 if ( len )
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diff changeset
293 sg_len++;
97
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294 if (net_debug) {
103
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diff changeset
295 diag_printf("xmit %d bytes at %x sg[%d]\n", len, data, sg_len);
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parents: 97
diff changeset
296 if ( 1 & net_debug )
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diff changeset
297 diag_dump_buf(data, len);
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diff changeset
298 }
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diff changeset
299 if ( MAX_ETH_DRV_SG < sg_len ) {
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diff changeset
300 diag_printf("too many mbufs to tx, %d > %d\n", sg_len, MAX_ETH_DRV_SG );
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301 sg_len = 0;
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302 break; // drop it on the floor
97
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303 }
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304 }
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305
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306 // Tell hardware to send this packet
103
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307 if ( sg_len )
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308 (sc->funs->send)(sc, sg_list, sg_len, total_len, (unsigned long)m0);
97
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309 }
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310
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311 cyg_scheduler_unlock(); // Allow DSRs to run
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312 }
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313
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314 //
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315 // This function is called from the hardware driver when an output operation
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316 // has completed - i.e. the packet has been sent.
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317 //
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318 void
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319 eth_drv_tx_done(struct eth_drv_sc *sc, unsigned long key, int status)
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320 {
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321 struct ifnet *ifp = &sc->sc_arpcom.ac_if;
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322 struct mbuf *m0 = (struct mbuf *)key;
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323 // Check for errors here (via 'status')
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324 // Done with packet
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325 m_freem(m0);
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326 // Start another if possible
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327 eth_drv_send(ifp);
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328 }
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329
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330 //
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331 // This function is called from a hardware driver to indicate that an input
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332 // packet has arrived. The routine will set up appropriate network resources
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333 // (mbuf's) to hold the data and call back into the driver to retrieve the data.
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334 //
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335 void
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336 eth_drv_recv(struct eth_drv_sc *sc, int total_len)
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337 {
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338 struct ifnet *ifp = &sc->sc_arpcom.ac_if;
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339 struct ether_header _eh, *eh=&_eh;
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340 struct mbuf *top, **mp, *m;
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341 int i, mlen;
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342 unsigned char *data;
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343 struct eth_drv_sg sg_list[MAX_ETH_DRV_SG];
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344 int sg_len;
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345
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346 /* Pull packet off interface. */
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347 MGETHDR(m, M_DONTWAIT, MT_DATA);
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348 if (m == 0) {
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349 diag_printf("warning: eth_recv out of MBUFs\n");
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350 }
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351
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352 // Set up buffers
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353 // Unload ethernet header separately so IP/UDP/TCP headers are aligned
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354 sg_list[0].buf = (CYG_ADDRESS)eh;
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355 sg_list[0].len = sizeof(*eh);
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356 sg_len = 1;
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357
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358 // Compute total length (minus ethernet header)
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359 total_len -= sizeof(*eh);
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360
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361 top = 0;
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362 mlen = MHLEN;
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363 mp = &top;
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364
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365 if (m) {
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366 m->m_pkthdr.rcvif = ifp;
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367 m->m_pkthdr.len = total_len;
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368 } else {
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369 sg_list[sg_len].buf = (CYG_ADDRESS)0;
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370 sg_list[sg_len].len = min(total_len, MCLBYTES);
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371 sg_len++;
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372 total_len = 0;
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373 }
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374
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375 while (total_len > 0) {
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376 if (top) {
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377 MGET(m, M_DONTWAIT, MT_DATA);
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378 if (m == 0) {
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379 m_freem(top);
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380 panic("out of MBUFs [2]");
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381 }
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382 mlen = MLEN;
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383 }
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384 if (total_len >= MINCLSIZE) {
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385 MCLGET(m, M_DONTWAIT);
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386 if ((m->m_flags & M_EXT) == 0) {
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387 m_freem(top);
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388 diag_printf("warning: eth_recv out of MBUFs\n");
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389 sg_list[sg_len].buf = (CYG_ADDRESS)0;
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390 sg_list[sg_len].len = min(total_len, MCLBYTES);
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391 sg_len++;
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392 top = 0;
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393 break;
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394 }
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395 mlen = MCLBYTES;
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396 }
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397 m->m_len = mlen = min(total_len, mlen);
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398 total_len -= mlen;
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399 data = mtod(m, caddr_t);
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400 sg_list[sg_len].buf = (CYG_ADDRESS)data;
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401 sg_list[sg_len].len = mlen;
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402 sg_len++;
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403 *mp = m;
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404 mp = &m->m_next;
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405 }
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406
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407 // Ask hardware to unload buffers
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408 (sc->funs->recv)(sc, sg_list, sg_len);
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409
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410 if (net_debug) {
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411 for (i = 0; i < sg_len; i++) {
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412 if (sg_list[i].buf) {
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413 diag_printf("rx %d bytes at %x sg[%d]\n", sg_list[i].len, sg_list[i].buf, i);
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414 if ( 1 & net_debug )
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415 diag_dump_buf((void *)sg_list[i].buf, sg_list[i].len);
97
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416 }
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417 }
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418 }
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419
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420 m = top;
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421 if (m == 0) {
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422 ifp->if_ierrors++;
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423 return;
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424 }
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425
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426 ifp->if_ipackets++;
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427
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428
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429 #if NBPFILTER > 0
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430 #error FIXME - Need mbuf with ethernet header attached
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431 /*
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432 * Check if there's a BPF listener on this interface.
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433 * If so, hand off the raw packet to bpf.
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434 */
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435 if (ifp->if_bpf)
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436 bpf_mtap(ifp->if_bpf, m);
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437 #endif
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438
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439 // Push data into protocol stacks
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440 ether_input(ifp, eh, m);
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441 }
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442
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443 // EOF eth_drv.c