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annotate e1000_implement_the_frame_transmission_chunk.patch @ 86:c99e69966dd3

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WIP/Cleanup on the tranmission
author Louis Opter <louis@lse.epitech.net>
date Tue, 18 Sep 2012 08:57:14 +0200
parents 5dda73e7d728
children e9736ab70995
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 42d6e2a573d077772c1a9c697cc066337569b129
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3 rathaxes: start to queue up packets in the TX ring on the e1000 sample
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4
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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 @@ -332,6 +332,30 @@
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20 }
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21 }
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22
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23 + template type e1000::TxFlags()
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24 + {
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25 + chunk LKM::includes()
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26 + {
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27 + static const ${e1000::TxFlags} force_enum_rtx_e1000_tx_flags_decl;
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28 + }
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29 +
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30 + chunk ::decl()
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31 + {
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32 + enum rtx_e1000_tx_flags
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33 + {
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34 + E1000_TX_FLAGS_CSUM = 0x00000001,
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35 + E1000_TX_FLAGS_VLAN = 0x00000002,
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36 + E1000_TX_FLAGS_TSO = 0x00000004,
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37 + E1000_TX_FLAGS_IPV4 = 0x00000008,
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38 + E1000_TX_FLAGS_NO_FCS = 0x00000010,
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39 + };
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40 + }
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41 +
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42 + map
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43 + {
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44 + }
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45 + }
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46 +
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47 template sequence e1000::create_device()
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48 {
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49 chunk Ethernet::create_device(PCI::Device pdev, Ethernet::Device rtx_ether_ctx)
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50 @@ -964,4 +988,86 @@
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51 }
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52 }
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53 }
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54 +
86
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55 + template sequence e1000::_xmit_tso_cksum_offload(Ethernet::Device ctx, Socket::SKBuff skb)
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56 + {
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57 + chunk ::CALL()
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58 + {
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59 + if (skb_is_gso(${skb}) || ${skb}->ip_summed == CHECKSUM_PARTIAL)
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60 + {
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61 + ${Log::info("xmit: the packet needs to be fragmented and/or checksummed but this not implemented yet!")};
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62 + return NETDEV_TX_OK;
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63 + }
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64 + }
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65 + }
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66 +
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67 + template sequence e1000::_xmit_map_skbuff(Ethernet::Device ctx, Socket::SKBuff skb)
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68 + {
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69 + chunk ::CALL()
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70 + {
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71 + dma_addr_t buff_addr = dma_map_single(
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72 + &${ctx}->pci_dev->dev,
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73 + ${skb}->data,
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74 + skb_headlen(${skb}),
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75 + DMA_TO_DEVICE);
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76 + if (dma_mapping_error(&${ctx}->pci_dev->dev, buff_addr))
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77 + {
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78 + ${Log::info("xmit: can't DMA map a SKBuff")};
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79 + goto err_dma_map;
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80 + }
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81 + }
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82 + }
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83 +
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84 + template sequence e1000::_xmit_update_tx_ring(Ethernet::Device, Socket::SKBuff skb)
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85 + {
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86 + chunk ::CALL()
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87 + {
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88 + }
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89 + }
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90 +
83
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91 + template sequence e1000::xmit(Ethernet::Device ctx, Socket::SKBuff skb)
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92 + {
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93 + chunk ::CALL()
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94 + {
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95 + typedef unsigned long int dma_addr_t;
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96 +
84
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97 + (void)1; // Issue 10
83
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98 + /*
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99 + * Put packets on the TX ring, must return NETDEV_TX_OK or
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100 + * NETDEV_TX_BUSY.
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101 + */
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102 + {
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103 + ${Log::info("xmit: skbuff details:")};
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104 + ${skb.dump_infos()};
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105 + }
85
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106 +
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107 + /*
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108 + * The transmission is going to be several steps:
86
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109 + * 1. TCP Segmentation Offload & Checksum Offloading: pick a
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110 + * descriptor from the tx ring and fill it as a contex
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111 + * descriptor to allow the card to slice into several packets
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112 + * according to the MSS;
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113 + * 2. DMA Map the skbuff data as slices of 4096;
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114 + * 3. Signal the hardware that data is available via a tx desc.
85
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115 + */
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116 +
86
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117 + /* 1. Offloading */
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118 + { // workaround #10 (and it's useful to workaround #47 too)
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119 + ${e1000::_xmit_tso_cksum_offload(ctx, skb)};
85
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120 + }
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121 +
86
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122 + /* 2. Map the data */
85
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123 + {
86
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124 + ${e1000::_xmit_map_skbuff(ctx, skb)};
85
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125 + }
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126 +
86
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127 + /* 3. Update the TX Ring */
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128 + {
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129 + ${e1000::_xmit_update_tx_ring(ctx, skb)};
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130 + }
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131 +
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132 + err_dma_map:
85
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133 + return NETDEV_TX_OK;
83
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134 + }
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135 + }
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136 }
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137 diff --git a/rathaxes/samples/e1000/e1000.rti b/rathaxes/samples/e1000/e1000.rti
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138 --- a/rathaxes/samples/e1000/e1000.rti
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139 +++ b/rathaxes/samples/e1000/e1000.rti
86
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140 @@ -51,6 +51,12 @@
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141 method decl();
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142 }
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143
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144 + provided type TxFlags
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145 + {
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146 + chunk LKM::includes();
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147 + chunk ::decl();
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148 + }
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149 +
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150 provided sequence create_device()
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151 {
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152 provided chunk Ethernet::create_device(PCI::Device, Ethernet::Device);
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153 @@ -109,6 +115,26 @@
83
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154 provided chunk ::CALL();
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155 }
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156
86
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157 + provided sequence _xmit_tso_cksum_offload(Ethernet::Device, Socket::SKBuff)
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158 + {
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159 + provided chunk ::CALL();
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160 + }
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161 +
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162 + provided sequence _xmit_map_skbuff(Ethernet::Device, Socket::SKBuff)
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163 + {
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164 + provided chunk ::CALL();
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165 + }
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166 +
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167 + provided sequence _xmit_update_tx_ring(Ethernet::Device, Socket::SKBuff)
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168 + {
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169 + provided chunk ::CALL();
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170 + }
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171 +
84
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172 + provided sequence xmit(Ethernet::Device, Socket::SKBuff)
83
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173 + {
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174 + provided chunk ::CALL();
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175 + }
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176 +
84
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177 provided sequence register_read32(e1000::Context, e1000::Register)
83
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178 {
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179 provided chunk LKM::prototypes();
84
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180 diff --git a/rathaxes/samples/e1000/ethernet.blt b/rathaxes/samples/e1000/ethernet.blt
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181 --- a/rathaxes/samples/e1000/ethernet.blt
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182 +++ b/rathaxes/samples/e1000/ethernet.blt
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183 @@ -1,6 +1,51 @@
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184 with Ethernet, PCI, LKM, Log
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185 {
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186 - template type Ethernet::Net()
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187 + template type Ethernet::ProtocolId()
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188 + {
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189 + chunk LKM::prototypes()
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190 + {
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191 + static const char *rtx_ethernet_protocol_id_to_str(unsigned short);
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192 + }
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193 +
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194 + chunk LKM::data()
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195 + {
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196 + static const struct
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197 + {
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198 + const unsigned short id;
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199 + const char *name;
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200 + } rtx_ethernet_proto_table[] =
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201 + {
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202 + { ETH_P_IP, "IPv4" },
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203 + { ETH_P_IPV6, "IPv6" },
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204 + { ETH_P_ARP, "ARP" },
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205 + };
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206 + }
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207 +
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208 + chunk LKM::code()
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209 + {
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210 + static const char *rtx_ethernet_protocol_id_to_str(unsigned short proto_id)
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211 + {
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diff changeset
212 + for (int i = 0;
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213 + i != sizeof(rtx_ethernet_proto_table[0]) / sizeof(rtx_ethernet_proto_table);
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214 + i++)
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215 + if (proto_id == rtx_ethernet_proto_table[i].id)
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216 + return rtx_ethernet_proto_table[i].name;
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217 +
85
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218 + return "Unknown";
84
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219 + }
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220 + }
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221 +
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222 + chunk to_str()
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223 + {
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224 + rtx_ethernet_protocol_id_to_str(${self});
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225 + }
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226 +
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227 + map
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228 + {
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229 + }
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230 + }
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diff changeset
231 +
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diff changeset
232 + template type Ethernet::AbstractDevice()
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233 {
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234 chunk LKM::includes()
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235 {
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236 @@ -17,11 +62,6 @@
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diff changeset
237 }
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238 }
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diff changeset
239
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240 - /*
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241 - * Unlike PCI::Device, Ethernet::Device doesn't match the struct net_device
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242 - * from Linux. Ethernet::Device is the type that we use in the private
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diff changeset
243 - * field of the struct net_device.
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diff changeset
244 - */
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245 template type Ethernet::Device()
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246 {
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247 chunk LKM::includes()
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diff changeset
248 @@ -52,7 +92,7 @@
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diff changeset
249 } *rtx_ethernet_dev_p;
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diff changeset
250 }
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diff changeset
251
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diff changeset
252 - chunk ::init(Ethernet::Net net_dev, PCI::Device pci_dev)
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diff changeset
253 + chunk ::init(Ethernet::AbstractDevice net_dev, PCI::Device pci_dev)
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diff changeset
254 {
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parents: 83
diff changeset
255 ${self} = netdev_priv(${net_dev});
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parents: 83
diff changeset
256 /*
85
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diff changeset
257 @@ -100,11 +140,11 @@
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diff changeset
258 {
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diff changeset
259 static int rtx_ethernet_xmit(struct sk_buff* skb, struct net_device *dev)
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diff changeset
260 {
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diff changeset
261 - ${cast local.dev as Ethernet::Device};
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diff changeset
262 + struct rtx_ethernet_dev* rtx_ethernet_dev = netdev_priv(dev);
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263 +
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264 + ${cast local.rtx_ethernet_dev as Ethernet::Device};
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265 ${cast local.skb as Socket::SKBuff};
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266 - ${pointcut ::IMPLEMENTATION(local.dev, local.skb)};
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267 -
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268 - return 0;
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269 + ${pointcut ::IMPLEMENTATION(local.rtx_ethernet_dev, local.skb)};
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270 }
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271 }
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272 }
84
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273 diff --git a/rathaxes/samples/e1000/ethernet.rti b/rathaxes/samples/e1000/ethernet.rti
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274 --- a/rathaxes/samples/e1000/ethernet.rti
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275 +++ b/rathaxes/samples/e1000/ethernet.rti
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276 @@ -1,16 +1,33 @@
84
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277 interface Ethernet : Socket, PCI, LKM
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278 {
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279 - provided type Net
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280 + provided type ProtocolId
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281 + {
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282 + chunk LKM::prototypes();
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283 + chunk LKM::data();
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284 + chunk LKM::code();
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285 + method ::to_str();
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286 + }
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287 +
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288 + /*
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289 + * This is the abstract type used by the Kernel to represent an ethernet
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290 + * device.
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291 + */
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292 + provided type AbstractDevice
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293 {
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294 chunk LKM::includes();
86
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295 method decl();
84
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296 }
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297
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298 + /*
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299 + * Unlike PCI::Device, Ethernet::Device doesn't match the struct net_device
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300 + * from Linux. Ethernet::Device is the type that we use in the private
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301 + * field of the struct net_device.
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302 + */
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303 provided type Device
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304 {
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305 chunk LKM::includes();
86
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306 method decl();
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307 - method init(Ethernet::Net, PCI::Device);
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308 + method init(Ethernet::AbstractDevice, PCI::Device);
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309 }
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310
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311 required variable ::string ifname;
83
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312 diff --git a/rathaxes/samples/e1000/lkm.rtx b/rathaxes/samples/e1000/lkm.rtx
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313 --- a/rathaxes/samples/e1000/lkm.rtx
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314 +++ b/rathaxes/samples/e1000/lkm.rtx
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315 @@ -46,6 +46,7 @@
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316 Ethernet::send(Ethernet::Device dev, Socket::SKBuff skb)
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317 {
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318 Log::info("we have one packet to transmit!");
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319 + e1000::xmit(dev, skb);
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320 }
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321
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322 LKM::init()
85
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323 @@ -79,4 +80,10 @@
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324 * 4096, 8192 and 16384 bytes:
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325 */
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326 e1000::rx_buffer_len = 2048;
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327 + /*
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328 + * 4096 bytes maximum per transmit descriptor is used on Linux and FreeBSD,
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329 + * 2048 on Minix and HelenOS, I can't find why. If I understand the Intel
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330 + * man correctly, the maximum should be 16288 (see section 3.3.3).
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331 + */
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332 + e1000::tx_max_data_per_desc = 4096;
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333 }
84
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334 diff --git a/rathaxes/samples/e1000/socket.blt b/rathaxes/samples/e1000/socket.blt
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335 --- a/rathaxes/samples/e1000/socket.blt
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336 +++ b/rathaxes/samples/e1000/socket.blt
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337 @@ -1,4 +1,4 @@
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338 -with Socket, LKM
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339 +with Socket, LKM, Ethernet
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340 {
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341 template type Socket::SKBuff()
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342 {
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343 @@ -10,13 +10,41 @@
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344
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345 chunk ::decl()
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346 {
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347 - struct sk_buff;
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348 + typedef struct sk_buff *rtx_socket_skbuff_p;
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349 }
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350
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351 chunk ::init()
84
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352 {
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353 }
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354
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355 + chunk ::dump_infos()
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356 + {
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357 + /*
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358 + * We should use a Rathaxes log abstraction instead of pr_info here,
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359 + * but Rathaxes doesn't support functions with a variable number of
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360 + * arguments yet.
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361 + */
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362 + unsigned short ethernet_proto = be16_to_cpu(${self}->protocol);
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363 + ${cast local.ethernet_proto as Ethernet::ProtocolId};
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364 +
85
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365 + static const char * const ip_summed_values[] = {
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366 + "none", "unnecessary", "complete", "partial"
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367 + };
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368 +
84
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369 + pr_info(
85
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370 + "\t protocol = %#-5x (%s)\n"
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371 + "\t len = %-5u data_len = %-5u head_len = %-5u\n"
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372 + "\t nr_frags = %u\n"
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373 + "\t gso_size = %-5u gso_segs = %-5u gso_type = %-5u\n"
86
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diff changeset
374 + "\tip_summed = %d (%s)",
84
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375 + ethernet_proto, "", // XXX: ${local.ethernet_proto.to_str()},
85
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376 + ${self}->len, ${self}->data_len, skb_headlen(${self}),
84
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377 + skb_shinfo(${self})->nr_frags,
85
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378 + skb_shinfo(${self})->gso_size, skb_shinfo(${self})->gso_segs, skb_shinfo(${self})->gso_type,
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379 + ${self}->ip_summed, ip_summed_values[${self}->ip_summed]
84
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380 + );
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381 + }
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diff changeset
382 +
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383 map
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384 {
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385 // some work may have to be done here in order
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386 diff --git a/rathaxes/samples/e1000/socket.rti b/rathaxes/samples/e1000/socket.rti
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387 --- a/rathaxes/samples/e1000/socket.rti
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388 +++ b/rathaxes/samples/e1000/socket.rti
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389 @@ -1,8 +1,10 @@
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390 interface Socket : LKM
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391 {
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Louis Opter <louis@lse.epitech.net>
parents: 83
diff changeset
392 - provided type Socket::SKBuff {
6432998a8245 Finish the patches on the rx/tx init and wip on the actual tx
Louis Opter <louis@lse.epitech.net>
parents: 83
diff changeset
393 + provided type Socket::SKBuff
6432998a8245 Finish the patches on the rx/tx init and wip on the actual tx
Louis Opter <louis@lse.epitech.net>
parents: 83
diff changeset
394 + {
86
c99e69966dd3 WIP/Cleanup on the tranmission
Louis Opter <louis@lse.epitech.net>
parents: 85
diff changeset
395 chunk LKM::includes();
c99e69966dd3 WIP/Cleanup on the tranmission
Louis Opter <louis@lse.epitech.net>
parents: 85
diff changeset
396 - method decl();
c99e69966dd3 WIP/Cleanup on the tranmission
Louis Opter <louis@lse.epitech.net>
parents: 85
diff changeset
397 - method init();
84
6432998a8245 Finish the patches on the rx/tx init and wip on the actual tx
Louis Opter <louis@lse.epitech.net>
parents: 83
diff changeset
398 + chunk ::decl();
6432998a8245 Finish the patches on the rx/tx init and wip on the actual tx
Louis Opter <louis@lse.epitech.net>
parents: 83
diff changeset
399 + method ::init();
6432998a8245 Finish the patches on the rx/tx init and wip on the actual tx
Louis Opter <louis@lse.epitech.net>
parents: 83
diff changeset
400 + method ::dump_infos();
6432998a8245 Finish the patches on the rx/tx init and wip on the actual tx
Louis Opter <louis@lse.epitech.net>
parents: 83
diff changeset
401 }
6432998a8245 Finish the patches on the rx/tx init and wip on the actual tx
Louis Opter <louis@lse.epitech.net>
parents: 83
diff changeset
402 }