Mercurial > archived > louis > epitech > mq > rathaxes
annotate rathaxes_samples_e1000_use_the_dma_abstraction_in_socket.patch @ 118:ad21d8a182ad
WIP: put up (hopefully the last) some touches on the dma abstraction
| author | Louis Opter <louis@lse.epita.fr> |
|---|---|
| date | Fri, 26 Jul 2013 16:44:08 -0700 |
| parents | f3c7e9b0c5cf |
| children | d84bc9a46771 |
| rev | line source |
|---|---|
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1 # HG changeset patch |
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118
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2 # Parent 0645a1612cc02ac70c718cabeaaa726cb2ecfdfd |
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111
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3 Replace Linux specific code in Socket by DMA calls |
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4 |
| 112 | 5 diff --git a/rathaxes/samples/e1000/socket.blt b/rathaxes/samples/e1000/socket.blt |
| 6 --- a/rathaxes/samples/e1000/socket.blt | |
| 7 +++ b/rathaxes/samples/e1000/socket.blt | |
| 8 @@ -1,4 +1,4 @@ | |
| 9 -with Socket, LKM, Device, Ethernet | |
| 10 +with Socket, LKM, Device, DMA, Ethernet | |
| 11 { | |
| 12 template type Socket::AbstractSKBuff() | |
| 13 { | |
| 117 | 14 @@ -14,7 +14,7 @@ |
| 15 | |
| 16 map | |
| 17 { | |
| 18 - k_sk_buff: ((struct sk_buff *)${self}); | |
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19 + k_sk_buff: ((struct sk_buff *)(${self})); |
| 117 | 20 } |
| 21 } | |
| 22 | |
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23 @@ -22,35 +22,34 @@ |
| 112 | 24 { |
| 25 decl data_types() | |
| 26 { | |
| 27 - ${Socket::AbstractSKBuff.ref} skbuff; | |
| 28 - dma_addr_t dma_handle; | |
| 29 + ${Socket::AbstractSKBuff.ref} skbuff; | |
| 30 + ${DMA::AbstractDMAHandle.scalar} dma_handle; | |
| 31 } | |
| 32 | |
| 33 chunk LKM::prototypes() | |
| 34 { | |
| 35 static void rtx_socket_skbuff_dump_infos(${Socket::SKBuff.ref}); | |
| 36 - static int rtx_socket_skbuff_map(${Socket::SKBuff.ref}, struct device *, enum dma_data_direction); | |
| 37 - static void rtx_socket_skbuff_unmap_and_free(${Socket::SKBuff.ref}, struct device *, enum dma_data_direction); | |
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38 + static int rtx_socket_skbuff_map(${Socket::SKBuff.ref}, ${Device::AbstractDevice.ref}, ${DMA::DMADirection.scalar}); |
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39 + static void rtx_socket_skbuff_unmap_and_free(${Socket::SKBuff.ref}, ${Device::AbstractDevice.ref}, ${DMA::DMADirection.scalar}); |
| 112 | 40 } |
| 41 | |
| 42 chunk LKM::code() | |
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43 { |
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44 static void rtx_socket_skbuff_dump_infos(${Socket::SKBuff.ref} self) |
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45 { |
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46 - WARN_ON(!self->skbuff); |
| 117 | 47 + WARN_ON(!${local.self.sk_buff}); |
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48 + |
| 117 | 49 + ${Ethernet::ProtocolId} ethernet_proto = { .id = be16_to_cpu(${local.self.sk_buff.k_sk_buff}->protocol) }; |
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50 + static const char * const ip_summed_values[] = { |
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51 + "none", "unnecessary", "complete", "partial" |
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52 + }; |
| 117 | 53 + struct skb_shared_info *shinfo = skb_shinfo(${local.self.sk_buff.k_sk_buff}); |
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54 |
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55 /* |
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56 * We should use a Rathaxes log abstraction instead of pr_info here, |
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57 * but Rathaxes doesn't support functions with a variable number of |
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58 * arguments yet. |
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59 */ |
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60 - ${Socket::AbstractSKBuff.ref} skb = self->skbuff; |
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61 - ${Ethernet::ProtocolId} ethernet_proto = { .id = be16_to_cpu(${local.skb.k_sk_buff}->protocol) }; |
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62 - static const char * const ip_summed_values[] = { |
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63 - "none", "unnecessary", "complete", "partial" |
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64 - }; |
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65 - struct skb_shared_info *shinfo = skb_shinfo(${local.skb.k_sk_buff}); |
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66 - |
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67 pr_info( |
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68 "\t protocol = %#-5x (%s) ip_summed = %d (%s)\n" |
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69 "\t len = %-5u data_len = %-5u head_len = %-5u\n" |
| 117 | 70 @@ -58,53 +57,46 @@ |
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71 "\t gso_size = %-5u gso_segs = %-5u gso_type = %-5u", |
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72 /* XXX: can't use ${local.ethernet_proto.id} here (issue #52): */ |
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73 ethernet_proto.id, ${local.ethernet_proto.str}, |
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74 - ${local.skb.k_sk_buff}->ip_summed, ip_summed_values[${local.skb.k_sk_buff}->ip_summed], |
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75 - ${local.skb.k_sk_buff}->len, ${local.skb.k_sk_buff}->data_len, skb_headlen(${local.skb.k_sk_buff}), |
| 117 | 76 + ${local.self.sk_buff.k_sk_buff}->ip_summed, ip_summed_values[${local.self.sk_buff.k_sk_buff}->ip_summed], |
| 77 + ${local.self.sk_buff.k_sk_buff}->len, ${local.self.sk_buff.k_sk_buff}->data_len, skb_headlen(${local.self.sk_buff.k_sk_buff}), | |
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78 shinfo->nr_frags, shinfo->gso_size, shinfo->gso_segs, shinfo->gso_type |
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79 ); |
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80 } |
| 112 | 81 |
| 82 static int rtx_socket_skbuff_map(${Socket::SKBuff.ref} self, | |
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83 - struct device *dev, |
| 112 | 84 - enum dma_data_direction direction) |
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85 + ${Device::AbstractDevice.ref} dev, |
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86 + ${DMA::DMADirection.scalar} direction) |
| 112 | 87 { |
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88 - ${Socket::AbstractSKBuff.ref} skb = self->skbuff; |
| 117 | 89 + WARN_ON(!${local.self.sk_buff}); |
| 90 + WARN_ON(${local.self.dma_handle}); | |
| 112 | 91 |
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92 - WARN_ON(!${local.skb.k_sk_buff}); |
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93 - WARN_ON(self->dma_handle); |
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94 - |
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95 - self->dma_handle = dma_map_single( |
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96 - dev, |
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97 - ${local.skb.k_sk_buff}, |
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98 - skb_headlen(${local.skb.k_sk_buff}), |
| 112 | 99 - direction); |
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100 - int err = dma_mapping_error(dev, self->dma_handle); |
| 117 | 101 + unsigned int len = skb_headlen(${local.self.sk_buff.k_sk_buff}); |
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102 + ${cast local.len as Builtin::number}; |
| 117 | 103 + ${local.self.dma_handle} = ${DMA::map(local.dev, local.self.sk_buff.k_sk_buff, local.len, local.direction)}; |
| 104 + int err = ${DMA::mapping_error(local.dev, local.self.dma_handle)}; | |
| 112 | 105 if (err) |
| 106 { | |
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107 - self->dma_handle = 0; |
| 117 | 108 + ${local.self.dma_handle} = 0; |
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109 return err; |
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110 } |
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111 return 0; |
| 117 | 112 } |
| 112 | 113 |
| 114 static void rtx_socket_skbuff_unmap_and_free(${Socket::SKBuff.ref} self, | |
| 117 | 115 - struct device *dev, |
| 112 | 116 - enum dma_data_direction direction) |
| 117 | 117 + ${Device::AbstractDevice.ref} dev, |
| 112 | 118 + ${DMA::DMADirection} direction) |
| 119 { | |
| 117 | 120 - ${Socket::AbstractSKBuff.ref} skb = self->skbuff; |
| 121 + WARN_ON(!${local.self.sk_buff}); | |
| 112 | 122 |
| 117 | 123 - WARN_ON(!${local.skb.k_sk_buff}); |
| 124 - | |
| 125 - if (self->dma_handle) | |
| 126 + if (${local.self.dma_handle}) | |
| 127 { | |
| 128 - dma_unmap_single(dev, | |
| 129 - self->dma_handle, | |
| 130 - skb_headlen(${local.skb.k_sk_buff}), | |
| 112 | 131 - direction); |
| 117 | 132 - self->dma_handle = 0; |
| 133 + unsigned int len = skb_headlen(${local.self.sk_buff.k_sk_buff}); | |
| 134 + ${cast local.len as Builtin::number}; | |
| 135 + ${DMA::unmap(local.dev, local.self.dma_handle, local.len, local.direction)}; | |
| 136 + ${local.self.dma_handle} = 0; | |
| 112 | 137 } |
| 117 | 138 - dev_kfree_skb_any(${local.skb.k_sk_buff}); |
| 139 - self->skbuff = 0; | |
| 140 + dev_kfree_skb_any(${local.self.sk_buff.k_sk_buff}); | |
| 141 + ${local.self.sk_buff} = NULL; | |
| 142 } | |
| 143 } | |
| 144 | |
| 145 @@ -115,8 +107,8 @@ | |
| 146 */ | |
| 147 method init(Socket::AbstractSKBuff kernel_skb) | |
| 148 { | |
| 149 - ${self}.skbuff = ${kernel_skb}; | |
| 150 - ${self}.dma_handle = 0; | |
| 151 + ${self.sk_buff} = ${kernel_skb}; | |
| 152 + ${self.dma_handle} = 0; | |
| 153 } | |
| 154 | |
| 155 method dump_infos() | |
| 156 @@ -126,30 +118,37 @@ | |
| 112 | 157 |
| 158 method map_to(Device::AbstractDevice dev) | |
| 159 { | |
| 160 - rtx_socket_skbuff_map(${self}, ${dev.k_device}, DMA_TO_DEVICE); | |
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161 + rtx_socket_skbuff_map(${self}, ${dev}, RTX_DMA_TO_DEVICE); |
| 112 | 162 } |
| 163 | |
| 164 method map_from(Device::AbstractDevice dev) | |
| 165 { | |
| 166 - rtx_socket_skbuff_map(${self}, ${dev.k_device}, DMA_FROM_DEVICE); | |
| 117 | 167 + rtx_socket_skbuff_map(${self}, ${dev}, RTX_DMA_FROM_DEVICE); |
| 112 | 168 } |
| 169 | |
| 170 method unmap_to_and_free(Device::AbstractDevice dev) | |
| 171 { | |
| 172 - rtx_socket_skbuff_unmap_and_free(${self}, ${dev.k_device}, DMA_TO_DEVICE); | |
| 117 | 173 + rtx_socket_skbuff_unmap_and_free(${self}, ${dev}, RTX_DMA_TO_DEVICE); |
| 112 | 174 } |
| 175 | |
| 176 method unmap_from_and_free(Device::AbstractDevice dev) | |
| 177 { | |
| 178 - rtx_socket_skbuff_unmap_and_free(${self}, ${dev.k_device}, DMA_FROM_DEVICE); | |
| 117 | 179 + rtx_socket_skbuff_unmap_and_free(${self}, ${dev}, RTX_DMA_FROM_DEVICE); |
| 112 | 180 } |
| 181 | |
| 182 map | |
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183 { |
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184 - // some work may have to be done here in order |
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185 - // to access to some field of the sk_buff. |
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186 - // We should determine if all the sk_buff management |
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187 - // can be abstracted from the user. |
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188 + // Some work may have to be done here in order to access to some |
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189 + // field of the sk_buff. We should determine if all the sk_buff |
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190 + // management can be abstracted from the user. But this is at least |
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191 + // useful for internal use: |
| 117 | 192 + sk_buff: (${self})->skbuff; |
| 193 + // XXX: We need to cast here so we can do things like | |
| 194 + // var.dma_handle = 0; but the type shouldn't be hardcoded (at the | |
| 195 + // same time ${DMA:AbstractDMAHandle} couldn't be used because that | |
| 196 + // would yield to a struct type which you can't assign directly; | |
| 197 + // but maybe doing the ->data in that case would be acceptable). | |
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198 + dma_handle: (*((dma_addr_t *)&(${self})->dma_handle)); |
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199 } |
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200 } |
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201 } |
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202 diff --git a/rathaxes/samples/e1000/socket.rti b/rathaxes/samples/e1000/socket.rti |
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203 --- a/rathaxes/samples/e1000/socket.rti |
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204 +++ b/rathaxes/samples/e1000/socket.rti |
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205 @@ -1,4 +1,4 @@ |
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206 -interface Socket : LKM, Device |
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207 +interface Socket : LKM, Device, DMA |
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208 { |
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209 /* The SKBuff type from the kernel */ |
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210 provided type AbstractSKBuff |
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211 @@ -19,5 +19,8 @@ |
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212 method map_from(Device::AbstractDevice); |
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213 method unmap_to_and_free(Device::AbstractDevice); |
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214 method unmap_from_and_free(Device::AbstractDevice); |
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215 + |
| 117 | 216 + attribute Socket::AbstractSKBuff.ref sk_buff; |
| 217 + attribute DMA::AbstractDMAHandle.scalar dma_handle; | |
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218 } |
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219 } |