Mercurial > archived > louis > epitech > mq > rathaxes

annotate e1000_implement_the_frame_transmission_chunk.patch @ 85:5dda73e7d728

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Add my WIP on the actual tx
author Louis Opter <louis@lse.epitech.net>
date Fri, 14 Sep 2012 08:58:35 +0200
parents 6432998a8245
children c99e69966dd3
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 # HG changeset patch
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2 # Parent 41aa481c1ba8a54a7291ac2630f2eebc50022f33
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3 rathaxes: start to queue up packets in the TX ring on the e1000 sample
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4
84
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5 diff --git a/maintainers/CMakeScripts/Templates/MakefileLKM.in b/maintainers/CMakeScripts/Templates/MakefileLKM.in
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6 --- a/maintainers/CMakeScripts/Templates/MakefileLKM.in
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7 +++ b/maintainers/CMakeScripts/Templates/MakefileLKM.in
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8 @@ -1,6 +1,6 @@
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9 # Disable this "coding-style" warning (seriously, you have to compile with
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10 # -pedantic to get it...)
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11 -EXTRA_CFLAGS = -Wno-declaration-after-statement
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12 +EXTRA_CFLAGS = -Wno-declaration-after-statement -std=gnu99
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13
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14 KDIR = /lib/modules/$(shell uname -r)/build
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15 obj-m := @LKM_OBJECTS@
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16 diff --git a/rathaxes/samples/e1000/e1000.blt b/rathaxes/samples/e1000/e1000.blt
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17 --- a/rathaxes/samples/e1000/e1000.blt
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18 +++ b/rathaxes/samples/e1000/e1000.blt
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19 @@ -964,4 +964,52 @@
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20 }
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21 }
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22 }
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23 +
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24 + template sequence e1000::xmit(Ethernet::Device ctx, Socket::SKBuff skb)
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25 + {
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26 + chunk ::CALL()
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27 + {
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28 + typedef unsigned long int dma_addr_t;
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29 +
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30 + (void)1; // Issue 10
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31 + /*
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32 + * Put packets on the TX ring, must return NETDEV_TX_OK or
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33 + * NETDEV_TX_BUSY.
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34 + */
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35 + {
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36 + ${Log::info("xmit: skbuff details:")};
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37 + ${skb.dump_infos()};
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38 + }
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39 +
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40 + /*
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41 + * The transmission is going to be several steps:
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42 + * - TCP Segmentation Offload & Checksum Offloading: pick a
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43 + * descriptor from the tx ring and fill it as a context descriptor
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44 + * to allow the card to slice into several packets according to
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45 + * the MSS;
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46 + * - DMA Map the skbuff data as slices of 4096;
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47 + * - Signal the hardware that data is available via a tx desc.
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48 + */
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49 +
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50 + if (skb_is_gso(${skb}) || ${skb}->ip_summed == CHECKSUM_PARTIAL)
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51 + {
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52 + ${Log::info("xmit: the packet needs to be fragmented and/or checksummed but this not implemented yet!")};
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53 + return NETDEV_TX_OK;
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54 + }
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55 +
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56 + /* XXX ${ctx} expands into skb */
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57 + dma_addr_t buff_addr = dma_map_single(
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58 + &${ctx}->pci_dev->dev,
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59 + ${skb}->data,
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60 + skb_headlen(${skb}),
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61 + DMA_TO_DEVICE);
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62 + if (dma_mapping_error(&${ctx}->pci_dev->dev, buff_addr))
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63 + {
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64 + ${Log::info("xmit: can't DMA map a SKBuff")};
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65 + /* now what, should I free the skb? */
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66 + }
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67 +
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68 + return NETDEV_TX_OK;
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69 + }
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70 + }
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71 }
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72 diff --git a/rathaxes/samples/e1000/e1000.rti b/rathaxes/samples/e1000/e1000.rti
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73 --- a/rathaxes/samples/e1000/e1000.rti
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74 +++ b/rathaxes/samples/e1000/e1000.rti
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75 @@ -109,6 +109,11 @@
83
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76 provided chunk ::CALL();
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77 }
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78
84
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79 + provided sequence xmit(Ethernet::Device, Socket::SKBuff)
83
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80 + {
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81 + provided chunk ::CALL();
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82 + }
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83 +
84
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84 provided sequence register_read32(e1000::Context, e1000::Register)
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85 {
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86 provided chunk LKM::prototypes();
84
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87 diff --git a/rathaxes/samples/e1000/ethernet.blt b/rathaxes/samples/e1000/ethernet.blt
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88 --- a/rathaxes/samples/e1000/ethernet.blt
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89 +++ b/rathaxes/samples/e1000/ethernet.blt
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90 @@ -1,6 +1,51 @@
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91 with Ethernet, PCI, LKM, Log
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92 {
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93 - template type Ethernet::Net()
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94 + template type Ethernet::ProtocolId()
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95 + {
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96 + chunk LKM::prototypes()
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97 + {
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98 + static const char *rtx_ethernet_protocol_id_to_str(unsigned short);
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99 + }
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100 +
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101 + chunk LKM::data()
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102 + {
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103 + static const struct
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104 + {
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105 + const unsigned short id;
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106 + const char *name;
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107 + } rtx_ethernet_proto_table[] =
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108 + {
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109 + { ETH_P_IP, "IPv4" },
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110 + { ETH_P_IPV6, "IPv6" },
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111 + { ETH_P_ARP, "ARP" },
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112 + };
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113 + }
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114 +
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115 + chunk LKM::code()
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116 + {
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117 + static const char *rtx_ethernet_protocol_id_to_str(unsigned short proto_id)
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118 + {
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119 + for (int i = 0;
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120 + i != sizeof(rtx_ethernet_proto_table[0]) / sizeof(rtx_ethernet_proto_table);
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121 + i++)
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122 + if (proto_id == rtx_ethernet_proto_table[i].id)
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123 + return rtx_ethernet_proto_table[i].name;
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124 +
85
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125 + return "Unknown";
84
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126 + }
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127 + }
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128 +
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129 + chunk to_str()
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130 + {
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131 + rtx_ethernet_protocol_id_to_str(${self});
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132 + }
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133 +
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134 + map
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135 + {
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136 + }
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137 + }
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138 +
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139 + template type Ethernet::AbstractDevice()
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140 {
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141 chunk LKM::includes()
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142 {
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143 @@ -17,11 +62,6 @@
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144 }
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145 }
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146
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147 - /*
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148 - * Unlike PCI::Device, Ethernet::Device doesn't match the struct net_device
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149 - * from Linux. Ethernet::Device is the type that we use in the private
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150 - * field of the struct net_device.
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151 - */
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152 template type Ethernet::Device()
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153 {
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154 chunk LKM::includes()
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155 @@ -52,7 +92,7 @@
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156 } *rtx_ethernet_dev_p;
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157 }
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158
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159 - chunk ::init(Ethernet::Net net_dev, PCI::Device pci_dev)
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160 + chunk ::init(Ethernet::AbstractDevice net_dev, PCI::Device pci_dev)
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161 {
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162 ${self} = netdev_priv(${net_dev});
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163 /*
85
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164 @@ -100,11 +140,11 @@
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165 {
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166 static int rtx_ethernet_xmit(struct sk_buff* skb, struct net_device *dev)
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167 {
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168 - ${cast local.dev as Ethernet::Device};
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169 + struct rtx_ethernet_dev* rtx_ethernet_dev = netdev_priv(dev);
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170 +
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171 + ${cast local.rtx_ethernet_dev as Ethernet::Device};
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172 ${cast local.skb as Socket::SKBuff};
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173 - ${pointcut ::IMPLEMENTATION(local.dev, local.skb)};
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174 -
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175 - return 0;
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176 + ${pointcut ::IMPLEMENTATION(local.rtx_ethernet_dev, local.skb)};
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177 }
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178 }
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179 }
84
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180 diff --git a/rathaxes/samples/e1000/ethernet.rti b/rathaxes/samples/e1000/ethernet.rti
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181 --- a/rathaxes/samples/e1000/ethernet.rti
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182 +++ b/rathaxes/samples/e1000/ethernet.rti
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183 @@ -1,11 +1,28 @@
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184 interface Ethernet : Socket, PCI, LKM
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185 {
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186 - provided type Net
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187 + provided type ProtocolId
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188 + {
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189 + chunk LKM::prototypes();
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190 + chunk LKM::data();
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191 + chunk LKM::code();
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192 + method ::to_str();
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193 + }
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194 +
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195 + /*
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196 + * This is the abstract type used by the Kernel to represent an ethernet
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197 + * device.
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198 + */
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199 + provided type AbstractDevice
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200 {
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201 chunk LKM::includes();
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202 chunk ::decl();
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203 }
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204
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205 + /*
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206 + * Unlike PCI::Device, Ethernet::Device doesn't match the struct net_device
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207 + * from Linux. Ethernet::Device is the type that we use in the private
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208 + * field of the struct net_device.
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209 + */
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210 provided type Device
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211 {
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212 chunk LKM::includes();
83
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parents:
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213 diff --git a/rathaxes/samples/e1000/lkm.rtx b/rathaxes/samples/e1000/lkm.rtx
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214 --- a/rathaxes/samples/e1000/lkm.rtx
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215 +++ b/rathaxes/samples/e1000/lkm.rtx
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216 @@ -46,6 +46,7 @@
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diff changeset
217 Ethernet::send(Ethernet::Device dev, Socket::SKBuff skb)
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218 {
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diff changeset
219 Log::info("we have one packet to transmit!");
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220 + e1000::xmit(dev, skb);
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parents:
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221 }
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222
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223 LKM::init()
85
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224 @@ -79,4 +80,10 @@
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225 * 4096, 8192 and 16384 bytes:
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226 */
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227 e1000::rx_buffer_len = 2048;
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228 + /*
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229 + * 4096 bytes maximum per transmit descriptor is used on Linux and FreeBSD,
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230 + * 2048 on Minix and HelenOS, I can't find why. If I understand the Intel
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231 + * man correctly, the maximum should be 16288 (see section 3.3.3).
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232 + */
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233 + e1000::tx_max_data_per_desc = 4096;
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234 }
84
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235 diff --git a/rathaxes/samples/e1000/socket.blt b/rathaxes/samples/e1000/socket.blt
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236 --- a/rathaxes/samples/e1000/socket.blt
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237 +++ b/rathaxes/samples/e1000/socket.blt
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238 @@ -1,4 +1,4 @@
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239 -with Socket, LKM
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240 +with Socket, LKM, Ethernet
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241 {
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242 template type Socket::SKBuff()
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243 {
85
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244 @@ -17,6 +17,34 @@
84
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245 {
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246 }
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247
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248 + chunk ::dump_infos()
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249 + {
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250 + /*
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251 + * We should use a Rathaxes log abstraction instead of pr_info here,
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252 + * but Rathaxes doesn't support functions with a variable number of
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253 + * arguments yet.
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254 + */
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255 + unsigned short ethernet_proto = be16_to_cpu(${self}->protocol);
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256 + ${cast local.ethernet_proto as Ethernet::ProtocolId};
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257 +
85
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258 + static const char * const ip_summed_values[] = {
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259 + "none", "unnecessary", "complete", "partial"
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260 + };
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261 +
84
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262 + pr_info(
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263 + "\t protocol = %#-5x (%s)\n"
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264 + "\t len = %-5u data_len = %-5u head_len = %-5u\n"
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265 + "\t nr_frags = %u\n"
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266 + "\t gso_size = %-5u gso_segs = %-5u gso_type = %-5u\n"
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267 + "\tip_summed = %d\n (%s)",
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268 + ethernet_proto, "", // XXX: ${local.ethernet_proto.to_str()},
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269 + ${self}->len, ${self}->data_len, skb_headlen(${self}),
84
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270 + skb_shinfo(${self})->nr_frags,
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271 + skb_shinfo(${self})->gso_size, skb_shinfo(${self})->gso_segs, skb_shinfo(${self})->gso_type,
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272 + ${self}->ip_summed, ip_summed_values[${self}->ip_summed]
84
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273 + );
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274 + }
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275 +
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276 map
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277 {
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278 // some work may have to be done here in order
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279 diff --git a/rathaxes/samples/e1000/socket.rti b/rathaxes/samples/e1000/socket.rti
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280 --- a/rathaxes/samples/e1000/socket.rti
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281 +++ b/rathaxes/samples/e1000/socket.rti
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282 @@ -1,8 +1,10 @@
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283 interface Socket : LKM
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284 {
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285 - provided type Socket::SKBuff {
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286 - chunk LKM::includes();
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287 - chunk ::decl();
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288 - method ::init();
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289 + provided type Socket::SKBuff
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290 + {
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291 + chunk LKM::includes();
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292 + chunk ::decl();
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293 + method ::init();
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294 + method ::dump_infos();
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295 }
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296 }