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annotate packages/io/usb/eth/slave/current/src/usbsethdrv.c @ 165:d63db767121d

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Merge from eCos master repository on 2001-06-29-06:43:03-BST
author jlarmour
date Fri, 29 Jun 2001 07:16:25 +0000
parents 25e238959bae
children e0c0827131d1
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1 //==========================================================================
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2 //
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3 // usbethdrv.c
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4 //
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5 // Network device driver for USB-ethernet devices.
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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) 2000, 2001 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 //==========================================================================
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32 //#####DESCRIPTIONBEGIN####
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33 //
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34 // Author(s): bartv
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35 // Contributors: bartv
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36 // Date: 2000-10-04
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37 //
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38 //####DESCRIPTIONEND####
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39 //==========================================================================
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40
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41 #include <cyg/infra/cyg_type.h>
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42 #include <cyg/hal/hal_arch.h>
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43 #include <cyg/infra/diag.h>
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44 #include <cyg/hal/drv_api.h>
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45
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46 #define __ECOS 1
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47 #include <netdev.h>
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48 #include <eth_drv.h>
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49 #include <eth_drv_stats.h>
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50
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51 #include <pkgconf/io_usb_slave_eth.h>
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52 #include <cyg/io/usb/usbs_eth.h>
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53
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54 // ----------------------------------------------------------------------------
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55 // The network driver data structure.
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56 ETH_DRV_SC(usbs_eth_sc0,
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57 (void*) &usbs_eth0,
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58 CYGDAT_USBS_ETHDRV_NAME,
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59 usbs_ethdrv_start,
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60 usbs_ethdrv_stop,
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61 usbs_ethdrv_ioctl,
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62 usbs_ethdrv_can_send,
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63 usbs_ethdrv_send,
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64 usbs_ethdrv_recv,
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65 usbs_ethdrv_deliver,
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66 usbs_ethdrv_poll,
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67 usbs_ethdrv_intvector);
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68
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69 NETDEVTAB_ENTRY(usbs_eth_netdev0,
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70 "usbs_eth0",
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71 usbs_ethdrv_init,
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72 &usbs_eth_sc0);
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73
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74 // ----------------------------------------------------------------------------
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75 // Statics gathering. The following macro can be used to increment a
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76 // statistic without having to use a #ifdef for the statistics
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77 // configuration option everywhere.
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78 #ifdef CYGFUN_USBS_ETHDRV_STATISTICS
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79 # define INCR_STAT(a) \
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80 CYG_MACRO_START \
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81 (a) += 1; \
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82 CYG_MACRO_END
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83 #else
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84 # define INCR_STAT(a) CYG_EMPTY_STATEMENT
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85 #endif
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86
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87 // Various constants related to SNMP statistics. It is not clear
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88 // what these are all for.
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89 #ifdef CYGFUN_USBS_ETHDRV_STATISTICS
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90 # define CYGDAT_USBS_ETHDRV_DESCRIPTION "eCos USB ethernet device"
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91 #endif
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92 // ----------------------------------------------------------------------------
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93 // Utility functions.
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94 //
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95 // The TCP/IP stack works in terms of scatter/gather buffers. USB tends to
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96 // involve DMA operations so it is more convenient to work in terms of
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97 // 1514 byte flat buffers. Actually, the first two bytes of the buffer
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98 // are used to hold the ethernet frame size to work around restrictions
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99 // with certain hardware implementations of USB that may be unable to
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100 // transfer certain packet sizes.
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101
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102 static bool
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103 scatter(unsigned char* buf, struct eth_drv_sg* sg, int sg_len)
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104 {
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105 unsigned int size;
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106
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107 size = buf[0] | (buf[1] << 8);
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108 buf++; buf++;
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109
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110 CYG_ASSERT((size >= CYGNUM_USBS_ETH_MIN_FRAME_SIZE) && (size <= CYGNUM_USBS_ETH_MAX_FRAME_SIZE),\
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111 "ethernet frame size limits must be observed");
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112
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113 while ((size > 0) && (sg_len > 0)) {
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114 if (size > sg->len) {
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115 memcpy((void*) sg->buf, buf, sg->len);
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116 buf += sg->len;
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117 size -= sg->len;
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118 sg++;
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119 sg_len--;
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120 } else {
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121 memcpy((void*) sg->buf, buf, size);
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122 size = 0;
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123 }
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124 }
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125
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126 return 0 == size;
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127 }
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128
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129 static bool
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130 gather(unsigned char* buf, unsigned int size, struct eth_drv_sg* sg, int sg_len)
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131 {
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132 unsigned int left = size;
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133 unsigned char* base = buf;
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134
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135 buf++; buf++;
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136 while ((left > 0) && (sg_len > 0)) {
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137 if (left > sg->len) {
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138 memcpy(buf, (void*) sg->buf, sg->len);
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139 buf += sg->len;
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140 left -= sg->len;
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141 sg++;
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142 sg_len--;
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143 } else {
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144 memcpy(buf, (void*) sg->buf, left);
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145 left = 0;
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146 }
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147 }
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148 size = size - left;
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149 base[0] = size & 0x00FF;
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150 base[1] = (size >> 8) & 0x00FF;
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151
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152 return 0 == left;
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153 }
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154
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155
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156 // ----------------------------------------------------------------------------
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157 // usbs_ethdrv_init()
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158 //
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159 // This function is called during system initialization to decide
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160 // whether or not this particular network device is usable. For
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161 // USB-ethernet this is problematical, the device is only really
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162 // usable once both sides have come up. The typical sequence
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163 // of events is something like:
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164 //
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165 // 1) the eCos peripheral is powered up. Static constructors are
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166 // run resulting in basic initialization.
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167 //
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168 // 2) the eCos TCP/IP stack initialization happens. Roughly in
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169 // parallel the eCos USB slave side is initialized as well,
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170 // i.e. enumeration data is supplied to control endpoints,
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171 // endpoints are associated with application classes, and so
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172 // on. The relative order of TCP/IP and USB initialization is
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173 // not particularly important.
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174 //
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175 // It is the TCP/IP stack's initialization code that will
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176 // invoke usbs_eth_init().
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177 //
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178 // 3) host-side USB detects that the eCos peripheral has been
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179 // connected or powered up. It goes through the enumeration
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180 // process and will end up loading a host-side network driver.
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181 // This connects to the eCos-side USB ethernet code to
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182 // e.g. obtain the MAC address.
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183 //
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184 // 4) when the host-side is ready, the eCos side can be brought up.
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185 // The required call is (sc->funs->eth_drv->init)(sc, enaddr)
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186 //
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187 // In practice it is easier for now to invoke the init() function
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188 // immediately. There are not going to be any incoming packets
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189 // until the host is ready, and can_send() can just return false
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190 // for the time being.
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191 //
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192 // Invoked in: thread context only
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193 // ----------------------------------------------------------------------------
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194
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195 static bool
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196 usbs_ethdrv_init(struct cyg_netdevtab_entry* ndp)
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197 {
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198 struct eth_drv_sc* sc = (struct eth_drv_sc*)(ndp->device_instance);
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199 usbs_eth* eth = (usbs_eth*)(sc->driver_private);
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200
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201 (*sc->funs->eth_drv->init)(sc, eth->ecos_MAC);
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202 return true;
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203 }
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204
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205 // ----------------------------------------------------------------------------
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206 // The receive process that is used to transfer a received ethernet
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207 // packet into the stack. The calling sequence is somewhat convoluted.
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208 // It started off as:
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209 //
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210 // 1) Ethernet hw ISR invoked by hardware, schedules its own
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211 // hw_dsr(), and blocks further interrupts in the ethernet chip
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212 // 2) hw_dsr() calls generic eth_drv_dsr() from io/eth common package
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213 // 3) eth_drv_dsr() interacts with the TCP/IP stack and allocates mbufs
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214 // (typically, the TCP/IP stack might not be in use)
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215 // 4) eth_drv_dsr() calls usbs_eth_recv() to transfer the data to mbufs
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216 // 5) eth_drv_dsr() returns to hw_dsr() which reenables interrupts
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217 // 6) hw_dsr() completes and everything can proceed.
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218 //
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219 // The problem with this is that the whole ethernet packet gets copied
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220 // inside a DSR, affecting dispatch latency (but not interrupt latency).
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221 // This is bad. Hence there is an alternative route involving a separate
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222 // thread in the TCP/IP stack.
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223 //
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224 // 1) Ethernet hw ISR runs as before, scheduling hw_dsr()
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225 // 2) hw_dsr() calls up into eth_drv_dsr()
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226 // 3) eth_drv_dsr() wakes up a thread inside the TCP/IP stack
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227 // 4) eth_drv_dsr() returns to hw_dsr(), which performs no further
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228 // processing. Ethernet chip interrupts remain disabled.
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229 // 5) The TCP/IP thread ends up calling hw_deliver(). This should take
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230 // care of any pending activity. For every buffered packet there should
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231 // be a call to a generic recv() function which then goes back into
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232 // the driver-specific recv() function.
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233 //
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234 // The advantage is that ethernet packet copying now happens at thread
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235 // level rather than DSR level so thread priorities can be used to
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236 // schedule things.
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237 //
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238 // USB-ethernet does not interact directly with any hardware, instead
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239 // it just passes information to lower levels of USB code. The reception
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240 // process is started by usbs_ethdrv_start() when the TCP/IP stack brings
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241 // up the interface.
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242 //
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243 // When the USB transfer has completed a callback will be invoked, at
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244 // DSR level. Assuming the transfer went ok, the callback will invoke
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245 // eth_drv_dsr() to inform the higher level code.
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246 //
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247 // The deliver function can check the state of the buffer
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248 // and go through the sc->funs->eth_drv->recv()/recv() sequence
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249 // to transfer the data into the stack.
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250 //
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251 // usbs_ethdrv_recv() does a scatter from the internal buffer into the
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252 // mbuf, thus freeing up the buffer. This allows it to start another
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253 // receive,
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254 //
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255 // Synchronisation involves the scheduler lock because the recv
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256 // callback is invoked inside a DSR.
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257
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258 static void usbs_ethdrv_halted_callback(void*, int);
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259
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260 static void
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261 usbs_ethdrv_recv_callback(usbs_eth* eth, void* callback_data, int size)
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262 {
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263 cyg_bool resubmit = true;
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264
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265 struct eth_drv_sc* sc = (struct eth_drv_sc*) callback_data;
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266 CYG_ASSERT( eth == (usbs_eth*)(sc->driver_private), "USB and TCP/IP worlds need to be consistent");
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267
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268 INCR_STAT(eth->interrupts);
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269 if (!eth->ecos_up) {
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270 // This message should just be discarded since the eCos TCP/IP
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271 // stack is not expecting anything from this interface.
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272 // Reception will resume when the interface comes back up.
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273 eth->rx_active = false;
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274 resubmit = false;
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275 } else if (size < 0) {
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276 // An error has occurred. The likely possibilities are:
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277 // -EPIPE: connection to the host has been broken
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278 // -EAGAIN: the endpoint is haltedn
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279 // -EMSGSIZE: bogus message from host
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280 // -EIO: other
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281
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282 if (-EAGAIN == size) {
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283 // EAGAIN should be handled by waiting for the endpoint to be reset.
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284 resubmit = false;
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285 usbs_start_rx_endpoint_wait(eth->rx_endpoint, &usbs_ethdrv_halted_callback, (void*) sc);
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286 } else if (-EMSGSIZE == size) {
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287 // Do nothing for now
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288 } else {
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289 // EPIPE should be resubmitted, the usbseth.c will use the
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290 // pending rx support. EIO could mean anything.
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291 }
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292 } else if (0 == size) {
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293 // The endpoint is no longer halted. Just do the resubmit at
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294 // the end.
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295 } else {
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296 // A packet has been received. Now do a size sanity check
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297 // based on the first two bytes.
165
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298 int real_size = eth->rx_bufptr[0] + (eth->rx_bufptr[1] << 8);
151
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299 if (real_size < CYGNUM_USBS_ETH_MIN_FRAME_SIZE) {
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300 INCR_STAT(eth->rx_short_frames);
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301 } else if (real_size > CYGNUM_USBS_ETH_MAX_FRAME_SIZE) {
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302 INCR_STAT(eth->rx_too_long_frames);
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303 } else {
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304 // The packet appears to be valid. Inform higher level
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305 // code and mark the buffer as in use.
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306 resubmit = false;
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307 eth->rx_buffer_full = true;
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308 eth->rx_active = false;
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309 eth_drv_dsr(0, 0, (cyg_addrword_t) sc);
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310 }
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311 }
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312
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313 if (resubmit) {
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314 eth->rx_active = true;
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315 usbs_eth_start_rx(eth, eth->rx_bufptr, &usbs_ethdrv_recv_callback, callback_data);
151
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316 }
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317 }
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318
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319 // Another callback, used to wait while an endpoint is halted.
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320 static void
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321 usbs_ethdrv_halted_callback(void* callback_data, int size)
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322 {
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323 struct eth_drv_sc* sc = (struct eth_drv_sc*) callback_data;
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324 usbs_ethdrv_recv_callback((usbs_eth*) sc->driver_private, callback_data, 0);
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325 }
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326
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327 // Start a receive operation. It is not possible to abort an existing
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328 // rx operation, so a valid sequence of events is: start, rx ongoing,
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329 // stop, restart. The rx_active field is used to keep track of whether
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330 // or not there is still a receive in progress. The receive callback
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331 // will just discard incoming data if the eCos stack is not currently
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332 // running.
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333 static void
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334 usbs_ethdrv_start_recv(struct eth_drv_sc* sc, usbs_eth* eth)
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335 {
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336 cyg_drv_dsr_lock();
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337 if (!eth->rx_active) {
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338 eth->rx_active = true;
165
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339 usbs_eth_start_rx(eth, eth->rx_bufptr, &usbs_ethdrv_recv_callback, (void*) sc);
151
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340 }
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341 cyg_drv_dsr_unlock();
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342 }
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343
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344 // This is invoked from the delivery thread when a valid buffer
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345 // has been received. The buffer should be scattered into the
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346 // supplied list, then another receive should be started.
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347
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348 static void
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349 usbs_ethdrv_recv(struct eth_drv_sc* sc,
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350 struct eth_drv_sg* sg_list, int sg_len)
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351 {
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352 usbs_eth* eth = (usbs_eth*)(sc->driver_private);
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353
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354 CYG_ASSERT( eth->rx_buffer_full, "This function should only be called when there is a buffer available");
165
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355 (void) scatter(eth->rx_bufptr, sg_list, sg_len);
151
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356 eth->rx_buffer_full = false;
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357 eth->rx_active = true;
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358 usbs_eth_start_rx(eth, eth->rx_bufptr, &usbs_ethdrv_recv_callback, (void*) sc);
151
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359 }
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360
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361 // ----------------------------------------------------------------------------
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362 // Now for the transmit process.
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363 //
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364 // When an application thread writes down a socket the data gets moved
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365 // into mbufs, and then passed to the appropriate device driver - which
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366 // may or may not be able to process it immediately. There is also a
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367 // timeout thread within the TCP/IP to handle retransmits etc.
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368 //
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369 // The stack will start by calling usbs_ethdrv_can_send() to determine
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370 // whether or not the driver can accept the packet. For the purposes
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371 // of the USB-ethernet driver this is true provided both host
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372 // and target are up and there is a spare buffer available.
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373 //
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374 // If the usbs_eth_can_send() returns true then there will be a call
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375 // to usbs_ethdrv_send(). This gathers the data into a single
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376 // buffer. If there is no transmit in progress yet then one is started.
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377 //
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378 // At some point the packet will have been transmitted and a callback
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379 // gets invoked. This needs to call eth_drv_dsr(), waking up the
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380 // delivery thread. The deliver() function can then check which
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381 // transmissions have completed and inform the higher level code
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382 // via sc->funs->eth_drv->tx_done(). The buffer can be re-used at
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383 // that point.
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384
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385 static void
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386 usbs_ethdrv_send_callback(usbs_eth* eth, void* callback_data, int size)
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387 {
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388 struct eth_drv_sc* sc = (struct eth_drv_sc*) callback_data;
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389 CYG_ASSERT( eth == (usbs_eth*)(sc->driver_private), "USB and TCP/IP worlds need to be consistent");
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390
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391 INCR_STAT(eth->interrupts);
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392
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393 // There are a variety of possible error codes. -EAGAIN indicates
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394 // that the endpoint is stalled. -EPIPE indicates that the
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395 // connection to the host has been lost. These are not really
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396 // particularly interesting. Whatever happens the buffer
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397 // must be cleared and higher-level code informed so that
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398 // the mbufs can be released.
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399 if (size > 0) {
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400 INCR_STAT(eth->tx_count);
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401 }
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402 eth->tx_done = true;
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403 eth_drv_dsr(0, 0, (cyg_addrword_t) sc);
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404 }
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405
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406 // Is it possible to send an ethernet frame? This requires
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407 // an empty buffer, i.e. there should be no existing
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408 // transmit in progress. It also requires that the host
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409 // is connected and that the endpoint is not currently halted.
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410 static int
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411 usbs_ethdrv_can_send(struct eth_drv_sc* sc)
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412 {
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413 usbs_eth* eth = (usbs_eth*)(sc->driver_private);
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414 return eth->host_up && !eth->tx_buffer_full && !eth->tx_endpoint->halted;
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415 }
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416
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417 // Actually start a packet transmission. This means collecting
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418 // all the data into a single buffer and then invoking the
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419 // lower-level code. The latter may discard the packet immediately
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420 // if the MAC is not appropriate: it would be more efficient to
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421 // catch that here, especially for large packets, but the check
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422 // has to happen inside the lower-level code anyway in case
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423 // that is being invoked directly rather than via the driver.
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424 //
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425 // There is a possible recursion problem,
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426 // send->start_tx->tx_done->can_send->send, which is guarded
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427 // against using the tx_in_send flag.
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428
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429 static void
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430 usbs_ethdrv_send(struct eth_drv_sc* sc,
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431 struct eth_drv_sg* sgl_list, int sg_len, int total_len,
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432 unsigned long key)
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433 {
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434 usbs_eth* eth = (usbs_eth*)(sc->driver_private);
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435
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436 CYG_ASSERT( 0 == eth->tx_in_send, "send() should not be invoked recursively");
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437 CYG_ASSERT( total_len <= CYGNUM_USBS_ETH_MAX_FRAME_SIZE, "ethernet maximum frame size should be observed");
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438 CYG_ASSERT( CYGNUM_USBS_ETH_MIN_FRAME_SIZE <= total_len, "ethernet minimum frame size should be observed");
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439
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440 eth->tx_in_send = true;
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441 CYG_ASSERT( !eth->tx_buffer_full, "the transmit buffer should be empty");
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442 gather(eth->tx_buffer, CYGNUM_USBS_ETH_MAX_FRAME_SIZE, sgl_list, sg_len);
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443 eth->tx_buffer_full = true;
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444 eth->tx_done = false;
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445 eth->tx_key = key;
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446 usbs_eth_start_tx(eth, eth->tx_buffer, &usbs_ethdrv_send_callback, (void*) sc);
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447 eth->tx_in_send = false;
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448 }
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449
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450 // ----------------------------------------------------------------------------
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451 // Deliver needs to take into account both receive and transmit buffers.
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452
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453 static void
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454 usbs_ethdrv_deliver(struct eth_drv_sc* sc)
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455 {
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456 usbs_eth* eth = (usbs_eth*)(sc->driver_private);
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457
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458 if (eth->rx_buffer_full) {
165
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diff changeset
459 int size = eth->rx_bufptr[0] + (eth->rx_bufptr[1] << 8);
151
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460 (*sc->funs->eth_drv->recv)(sc, size);
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461 }
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462 if (eth->tx_done) {
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463 unsigned long key = eth->tx_key;
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464 eth->tx_buffer_full = false;
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465 eth->tx_done = false;
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466 (*sc->funs->eth_drv->tx_done)(sc, key, 1);
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467 }
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468 }
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469
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470 // ----------------------------------------------------------------------------
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471 // usbs_ethdrv_start()
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472 //
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473 // This gets called by the TCP/IP stack later on during
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474 // initialization, when the stack is ready to send and receive
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475 // packets. It may get called multiple times while the stack
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476 // is running, with different flags values.
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477 //
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478 // As far as transmits are concerned, nothing needs to be done. If no
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479 // transmit is in progress then everything is fine anyway. If a
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480 // transmit is already in progress then it must be allowed to complete
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481 // via the usual route. Receives should however be restarted, the
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482 // start function has appropriate safeguards.
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483 //
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484 // Invoked in: thread context only
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485 // ----------------------------------------------------------------------------
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486
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487 static void
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488 usbs_ethdrv_start(struct eth_drv_sc* sc, unsigned char* enaddr, int flags)
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489 {
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490 usbs_eth* eth = (usbs_eth*)(sc->driver_private);
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491 if (!eth->ecos_up) {
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492 eth->ecos_up = true;
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493 usbs_ethdrv_start_recv(sc, eth);
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494 }
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495 }
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496
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497 // ----------------------------------------------------------------------------
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498 // usbs_ethdrv_stop()
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499 //
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500 // Similarly this gets called by the TCP/IP stack to bring the network
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501 // interface down. Nothing should happen for any packets currently
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diff changeset
502 // being transmitted or received, that would cause confusion everywhere.
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diff changeset
503 // The receive callback checks the ecos_up flag and does the right
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504 // thing. The TCP/IP stack should not call can_send() after taking
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505 // the interface down so no new transmits will be initiated.
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506 //
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507 // Invoked in: thread context only
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508 // ----------------------------------------------------------------------------
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parents:
diff changeset
509
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diff changeset
510 static void
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511 usbs_ethdrv_stop(struct eth_drv_sc* sc)
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512 {
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513 usbs_eth* eth = (usbs_eth*)(sc->driver_private);
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514 eth->ecos_up = false;
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515 }
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516
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517 // ----------------------------------------------------------------------------
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parents:
diff changeset
518 // usbs_eth_ioctl()
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parents:
diff changeset
519 //
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520 // The operations to worry about here are:
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521 //
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522 // SET_MAC_ADDRESS,via the SIOCSIFHWADDR ioctl
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523 //
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524 // GET_IF_STATS and GET_IF_STATS_UD, to report gathered statistics.
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525 //
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526 // Invoked in: thread context only
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527 // ----------------------------------------------------------------------------
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diff changeset
528
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diff changeset
529 static int
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530 usbs_ethdrv_ioctl(struct eth_drv_sc* sc, unsigned long key, void* data, int data_length)
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531 {
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diff changeset
532 usbs_eth* eth = (usbs_eth*)(sc->driver_private);
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533 int result = EINVAL;
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diff changeset
534
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535 switch(key) {
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536 case ETH_DRV_SET_MAC_ADDRESS:
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parents:
diff changeset
537 {
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parents:
diff changeset
538 if (6 == data_length) {
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diff changeset
539 memcpy(eth->ecos_MAC, data, 6);
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diff changeset
540 result = 0;
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diff changeset
541 }
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diff changeset
542 }
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diff changeset
543 break;
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diff changeset
544 #if defined(CYGFUN_USBS_ETHDRV_STATISTICS) && defined(ETH_DRV_GET_IF_STATS_UD)
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parents:
diff changeset
545 case ETH_DRV_GET_IF_STATS_UD:
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jlarmour
parents:
diff changeset
546 case ETH_DRV_GET_IF_STATS:
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jlarmour
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diff changeset
547 {
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diff changeset
548 static unsigned char my_chipset[] = { 0, 0 };
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diff changeset
549 struct ether_drv_stats *p = (struct ether_drv_stats*) data;
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diff changeset
550 int i;
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diff changeset
551 strcpy(p->description, CYGDAT_USBS_ETHDRV_DESCRIPTION);
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parents:
diff changeset
552 for ( i = 0; i < SNMP_CHIPSET_LEN; i++ ) {
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parents:
diff changeset
553 if ( 0 == (p->snmp_chipset[i] = my_chipset[i]) ) {
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diff changeset
554 break;
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jlarmour
parents:
diff changeset
555 }
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jlarmour
parents:
diff changeset
556 }
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diff changeset
557 p->duplex = 3; // 3 == duplex
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diff changeset
558 p->operational = (eth->host_up && eth->ecos_up) ? 3 : 2; // 3 == up, 2 == down
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parents:
diff changeset
559 p->speed = 10 * 1000000;
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diff changeset
560 p->supports_dot3 = 1;
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parents:
diff changeset
561 p->rx_too_long_frames = eth->rx_too_long_frames;
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jlarmour
parents:
diff changeset
562 p->rx_short_frames = eth->rx_short_frames;
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parents:
diff changeset
563 p->interrupts = eth->interrupts;
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diff changeset
564 p->rx_count = eth->rx_count;
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jlarmour
parents:
diff changeset
565 p->tx_count = eth->tx_count;
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jlarmour
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diff changeset
566 p->tx_queue_len = 1;
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jlarmour
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diff changeset
567 }
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jlarmour
parents:
diff changeset
568 break;
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diff changeset
569 #endif
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jlarmour
parents:
diff changeset
570
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jlarmour
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diff changeset
571 default:
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jlarmour
parents:
diff changeset
572 break;
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jlarmour
parents:
diff changeset
573 }
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jlarmour
parents:
diff changeset
574
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parents:
diff changeset
575 return result;
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576 }
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577
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578
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579 // ----------------------------------------------------------------------------
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580 // usbs_ethdrv_poll()
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581 //
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582 // On real ethernet hardware this is used by RedBoot once the
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583 // application has started running, so that the network device can be
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584 // used for debugging purposes as well as for the application's own
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585 // needs. The lower-level USB device may supply a poll function as well.
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586 // ----------------------------------------------------------------------------
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587 static void
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588 usbs_ethdrv_poll(struct eth_drv_sc* sc)
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589 {
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590 usbs_eth* eth = (usbs_eth*)(sc->driver_private);
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591 (*eth->control_endpoint->poll_fn)(eth->control_endpoint);
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592 }
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593
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594 // ----------------------------------------------------------------------------
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595 // usbs_ethdrv_intvector()
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596 //
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597 // See usbs_eth_poll().
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598 // ----------------------------------------------------------------------------
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599
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600 static int
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601 usbs_ethdrv_intvector(struct eth_drv_sc* sc)
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602 {
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603 usbs_eth* eth = (usbs_eth*)(sc->driver_private);
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604 return eth->control_endpoint->interrupt_vector;
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605 }
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606
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607