Vasu Dev | a1a6936 | 2014-08-01 13:27:02 -0700 | [diff] [blame] | 1 | /******************************************************************************* |
| 2 | * |
| 3 | * Intel Ethernet Controller XL710 Family Linux Driver |
| 4 | * Copyright(c) 2013 - 2014 Intel Corporation. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify it |
| 7 | * under the terms and conditions of the GNU General Public License, |
| 8 | * version 2, as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 13 | * more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program. If not, see <http://www.gnu.org/licenses/>. |
| 17 | * |
| 18 | * The full GNU General Public License is included in this distribution in |
| 19 | * the file called "COPYING". |
| 20 | * |
| 21 | * Contact Information: |
| 22 | * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net> |
| 23 | * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 |
| 24 | * |
| 25 | ******************************************************************************/ |
| 26 | |
| 27 | |
| 28 | #include <linux/if_ether.h> |
| 29 | #include <scsi/scsi_cmnd.h> |
| 30 | #include <scsi/scsi_device.h> |
| 31 | #include <scsi/fc/fc_fs.h> |
| 32 | #include <scsi/fc/fc_fip.h> |
| 33 | #include <scsi/fc/fc_fcoe.h> |
| 34 | #include <scsi/libfc.h> |
| 35 | #include <scsi/libfcoe.h> |
| 36 | |
| 37 | #include "i40e.h" |
| 38 | #include "i40e_fcoe.h" |
| 39 | |
| 40 | /** |
| 41 | * i40e_rx_is_fip - returns true if the rx packet type is FIP |
| 42 | * @ptype: the packet type field from rx descriptor write-back |
| 43 | **/ |
| 44 | static inline bool i40e_rx_is_fip(u16 ptype) |
| 45 | { |
| 46 | return ptype == I40E_RX_PTYPE_L2_FIP_PAY2; |
| 47 | } |
| 48 | |
| 49 | /** |
| 50 | * i40e_rx_is_fcoe - returns true if the rx packet type is FCoE |
| 51 | * @ptype: the packet type field from rx descriptor write-back |
| 52 | **/ |
| 53 | static inline bool i40e_rx_is_fcoe(u16 ptype) |
| 54 | { |
| 55 | return (ptype >= I40E_RX_PTYPE_L2_FCOE_PAY3) && |
| 56 | (ptype <= I40E_RX_PTYPE_L2_FCOE_VFT_FCOTHER); |
| 57 | } |
| 58 | |
| 59 | /** |
| 60 | * i40e_fcoe_sof_is_class2 - returns true if this is a FC Class 2 SOF |
| 61 | * @sof: the FCoE start of frame delimiter |
| 62 | **/ |
| 63 | static inline bool i40e_fcoe_sof_is_class2(u8 sof) |
| 64 | { |
| 65 | return (sof == FC_SOF_I2) || (sof == FC_SOF_N2); |
| 66 | } |
| 67 | |
| 68 | /** |
| 69 | * i40e_fcoe_sof_is_class3 - returns true if this is a FC Class 3 SOF |
| 70 | * @sof: the FCoE start of frame delimiter |
| 71 | **/ |
| 72 | static inline bool i40e_fcoe_sof_is_class3(u8 sof) |
| 73 | { |
| 74 | return (sof == FC_SOF_I3) || (sof == FC_SOF_N3); |
| 75 | } |
| 76 | |
| 77 | /** |
| 78 | * i40e_fcoe_sof_is_supported - returns true if the FC SOF is supported by HW |
| 79 | * @sof: the input SOF value from the frame |
| 80 | **/ |
| 81 | static inline bool i40e_fcoe_sof_is_supported(u8 sof) |
| 82 | { |
| 83 | return i40e_fcoe_sof_is_class2(sof) || |
| 84 | i40e_fcoe_sof_is_class3(sof); |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * i40e_fcoe_fc_sof - pull the SOF from FCoE header in the frame |
| 89 | * @skb: the frame whose EOF is to be pulled from |
| 90 | **/ |
| 91 | static inline int i40e_fcoe_fc_sof(struct sk_buff *skb, u8 *sof) |
| 92 | { |
| 93 | *sof = ((struct fcoe_hdr *)skb_network_header(skb))->fcoe_sof; |
| 94 | |
| 95 | if (!i40e_fcoe_sof_is_supported(*sof)) |
| 96 | return -EINVAL; |
| 97 | return 0; |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * i40e_fcoe_eof_is_supported - returns true if the EOF is supported by HW |
| 102 | * @eof: the input EOF value from the frame |
| 103 | **/ |
| 104 | static inline bool i40e_fcoe_eof_is_supported(u8 eof) |
| 105 | { |
| 106 | return (eof == FC_EOF_N) || (eof == FC_EOF_T) || |
| 107 | (eof == FC_EOF_NI) || (eof == FC_EOF_A); |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * i40e_fcoe_fc_eof - pull EOF from FCoE trailer in the frame |
| 112 | * @skb: the frame whose EOF is to be pulled from |
| 113 | **/ |
| 114 | static inline int i40e_fcoe_fc_eof(struct sk_buff *skb, u8 *eof) |
| 115 | { |
| 116 | /* the first byte of the last dword is EOF */ |
| 117 | skb_copy_bits(skb, skb->len - 4, eof, 1); |
| 118 | |
| 119 | if (!i40e_fcoe_eof_is_supported(*eof)) |
| 120 | return -EINVAL; |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * i40e_fcoe_ctxt_eof - convert input FC EOF for descriptor programming |
| 126 | * @eof: the input eof value from the frame |
| 127 | * |
| 128 | * The FC EOF is converted to the value understood by HW for descriptor |
| 129 | * programming. Never call this w/o calling i40e_fcoe_eof_is_supported() |
| 130 | * first. |
| 131 | **/ |
| 132 | static inline u32 i40e_fcoe_ctxt_eof(u8 eof) |
| 133 | { |
| 134 | switch (eof) { |
| 135 | case FC_EOF_N: |
| 136 | return I40E_TX_DESC_CMD_L4T_EOFT_EOF_N; |
| 137 | case FC_EOF_T: |
| 138 | return I40E_TX_DESC_CMD_L4T_EOFT_EOF_T; |
| 139 | case FC_EOF_NI: |
| 140 | return I40E_TX_DESC_CMD_L4T_EOFT_EOF_NI; |
| 141 | case FC_EOF_A: |
| 142 | return I40E_TX_DESC_CMD_L4T_EOFT_EOF_A; |
| 143 | default: |
| 144 | /* FIXME: still returns 0 */ |
| 145 | pr_err("Unrecognized EOF %x\n", eof); |
| 146 | return 0; |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | /** |
| 151 | * i40e_fcoe_xid_is_valid - returns true if the exchange id is valid |
| 152 | * @xid: the exchange id |
| 153 | **/ |
| 154 | static inline bool i40e_fcoe_xid_is_valid(u16 xid) |
| 155 | { |
| 156 | return (xid != FC_XID_UNKNOWN) && (xid < I40E_FCOE_DDP_MAX); |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * i40e_fcoe_ddp_unmap - unmap the mapped sglist associated |
| 161 | * @pf: pointer to pf |
| 162 | * @ddp: sw DDP context |
| 163 | * |
| 164 | * Unmap the scatter-gather list associated with the given SW DDP context |
| 165 | * |
| 166 | * Returns: data length already ddp-ed in bytes |
| 167 | * |
| 168 | **/ |
| 169 | static inline void i40e_fcoe_ddp_unmap(struct i40e_pf *pf, |
| 170 | struct i40e_fcoe_ddp *ddp) |
| 171 | { |
| 172 | if (test_and_set_bit(__I40E_FCOE_DDP_UNMAPPED, &ddp->flags)) |
| 173 | return; |
| 174 | |
| 175 | if (ddp->sgl) { |
| 176 | dma_unmap_sg(&pf->pdev->dev, ddp->sgl, ddp->sgc, |
| 177 | DMA_FROM_DEVICE); |
| 178 | ddp->sgl = NULL; |
| 179 | ddp->sgc = 0; |
| 180 | } |
| 181 | |
| 182 | if (ddp->pool) { |
| 183 | dma_pool_free(ddp->pool, ddp->udl, ddp->udp); |
| 184 | ddp->pool = NULL; |
| 185 | } |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * i40e_fcoe_ddp_clear - clear the given SW DDP context |
| 190 | * @ddp - SW DDP context |
| 191 | **/ |
| 192 | static inline void i40e_fcoe_ddp_clear(struct i40e_fcoe_ddp *ddp) |
| 193 | { |
| 194 | memset(ddp, 0, sizeof(struct i40e_fcoe_ddp)); |
| 195 | ddp->xid = FC_XID_UNKNOWN; |
| 196 | ddp->flags = __I40E_FCOE_DDP_NONE; |
| 197 | } |
| 198 | |
| 199 | /** |
| 200 | * i40e_fcoe_progid_is_fcoe - check if the prog_id is for FCoE |
| 201 | * @id: the prog id for the programming status Rx descriptor write-back |
| 202 | **/ |
| 203 | static inline bool i40e_fcoe_progid_is_fcoe(u8 id) |
| 204 | { |
| 205 | return (id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_PROG_STATUS) || |
| 206 | (id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_INVL_STATUS); |
| 207 | } |
| 208 | |
| 209 | /** |
| 210 | * i40e_fcoe_fc_get_xid - get xid from the frame header |
| 211 | * @fh: the fc frame header |
| 212 | * |
| 213 | * In case the incoming frame's exchange is originated from |
| 214 | * the initiator, then received frame's exchange id is ANDed |
| 215 | * with fc_cpu_mask bits to get the same cpu on which exchange |
| 216 | * was originated, otherwise just use the current cpu. |
| 217 | * |
| 218 | * Returns ox_id if exchange originator, rx_id if responder |
| 219 | **/ |
| 220 | static inline u16 i40e_fcoe_fc_get_xid(struct fc_frame_header *fh) |
| 221 | { |
| 222 | u32 f_ctl = ntoh24(fh->fh_f_ctl); |
| 223 | |
| 224 | return (f_ctl & FC_FC_EX_CTX) ? |
| 225 | be16_to_cpu(fh->fh_ox_id) : |
| 226 | be16_to_cpu(fh->fh_rx_id); |
| 227 | } |
| 228 | |
| 229 | /** |
| 230 | * i40e_fcoe_fc_frame_header - get fc frame header from skb |
| 231 | * @skb: packet |
| 232 | * |
| 233 | * This checks if there is a VLAN header and returns the data |
| 234 | * pointer to the start of the fc_frame_header. |
| 235 | * |
| 236 | * Returns pointer to the fc_frame_header |
| 237 | **/ |
| 238 | static inline struct fc_frame_header *i40e_fcoe_fc_frame_header( |
| 239 | struct sk_buff *skb) |
| 240 | { |
| 241 | void *fh = skb->data + sizeof(struct fcoe_hdr); |
| 242 | |
| 243 | if (eth_hdr(skb)->h_proto == htons(ETH_P_8021Q)) |
| 244 | fh += sizeof(struct vlan_hdr); |
| 245 | |
| 246 | return (struct fc_frame_header *)fh; |
| 247 | } |
| 248 | |
| 249 | /** |
| 250 | * i40e_fcoe_ddp_put - release the DDP context for a given exchange id |
| 251 | * @netdev: the corresponding net_device |
| 252 | * @xid: the exchange id that corresponding DDP context will be released |
| 253 | * |
| 254 | * This is the implementation of net_device_ops.ndo_fcoe_ddp_done |
| 255 | * and it is expected to be called by ULD, i.e., FCP layer of libfc |
| 256 | * to release the corresponding ddp context when the I/O is done. |
| 257 | * |
| 258 | * Returns : data length already ddp-ed in bytes |
| 259 | **/ |
| 260 | static int i40e_fcoe_ddp_put(struct net_device *netdev, u16 xid) |
| 261 | { |
| 262 | struct i40e_netdev_priv *np = netdev_priv(netdev); |
| 263 | struct i40e_pf *pf = np->vsi->back; |
| 264 | struct i40e_fcoe *fcoe = &pf->fcoe; |
| 265 | int len = 0; |
| 266 | struct i40e_fcoe_ddp *ddp = &fcoe->ddp[xid]; |
| 267 | |
| 268 | if (!fcoe || !ddp) |
| 269 | goto out; |
| 270 | |
| 271 | if (test_bit(__I40E_FCOE_DDP_DONE, &ddp->flags)) |
| 272 | len = ddp->len; |
| 273 | i40e_fcoe_ddp_unmap(pf, ddp); |
| 274 | out: |
| 275 | return len; |
| 276 | } |
| 277 | |
| 278 | /** |
| 279 | * i40e_fcoe_sw_init - sets up the HW for FCoE |
| 280 | * @pf: pointer to pf |
| 281 | * |
| 282 | * Returns 0 if FCoE is supported otherwise the error code |
| 283 | **/ |
| 284 | int i40e_init_pf_fcoe(struct i40e_pf *pf) |
| 285 | { |
| 286 | struct i40e_hw *hw = &pf->hw; |
| 287 | u32 val; |
| 288 | |
| 289 | pf->flags &= ~I40E_FLAG_FCOE_ENABLED; |
| 290 | pf->num_fcoe_qps = 0; |
| 291 | pf->fcoe_hmc_cntx_num = 0; |
| 292 | pf->fcoe_hmc_filt_num = 0; |
| 293 | |
| 294 | if (!pf->hw.func_caps.fcoe) { |
| 295 | dev_info(&pf->pdev->dev, "FCoE capability is disabled\n"); |
| 296 | return 0; |
| 297 | } |
| 298 | |
| 299 | if (!pf->hw.func_caps.dcb) { |
| 300 | dev_warn(&pf->pdev->dev, |
| 301 | "Hardware is not DCB capable not enabling FCoE.\n"); |
| 302 | return 0; |
| 303 | } |
| 304 | |
| 305 | /* enable FCoE hash filter */ |
| 306 | val = rd32(hw, I40E_PFQF_HENA(1)); |
| 307 | val |= 1 << (I40E_FILTER_PCTYPE_FCOE_OX - 32); |
| 308 | val |= 1 << (I40E_FILTER_PCTYPE_FCOE_RX - 32); |
| 309 | val &= I40E_PFQF_HENA_PTYPE_ENA_MASK; |
| 310 | wr32(hw, I40E_PFQF_HENA(1), val); |
| 311 | |
| 312 | /* enable flag */ |
| 313 | pf->flags |= I40E_FLAG_FCOE_ENABLED; |
| 314 | pf->num_fcoe_qps = I40E_DEFAULT_FCOE; |
| 315 | |
| 316 | /* Reserve 4K DDP contexts and 20K filter size for FCoE */ |
| 317 | pf->fcoe_hmc_cntx_num = (1 << I40E_DMA_CNTX_SIZE_4K) * |
| 318 | I40E_DMA_CNTX_BASE_SIZE; |
| 319 | pf->fcoe_hmc_filt_num = pf->fcoe_hmc_cntx_num + |
| 320 | (1 << I40E_HASH_FILTER_SIZE_16K) * |
| 321 | I40E_HASH_FILTER_BASE_SIZE; |
| 322 | |
| 323 | /* FCoE object: max 16K filter buckets and 4K DMA contexts */ |
| 324 | pf->filter_settings.fcoe_filt_num = I40E_HASH_FILTER_SIZE_16K; |
| 325 | pf->filter_settings.fcoe_cntx_num = I40E_DMA_CNTX_SIZE_4K; |
| 326 | |
| 327 | /* Setup max frame with FCoE_MTU plus L2 overheads */ |
| 328 | val = rd32(hw, I40E_GLFCOE_RCTL); |
| 329 | val &= ~I40E_GLFCOE_RCTL_MAX_SIZE_MASK; |
| 330 | val |= ((FCOE_MTU + ETH_HLEN + VLAN_HLEN + ETH_FCS_LEN) |
| 331 | << I40E_GLFCOE_RCTL_MAX_SIZE_SHIFT); |
| 332 | wr32(hw, I40E_GLFCOE_RCTL, val); |
| 333 | |
| 334 | dev_info(&pf->pdev->dev, "FCoE is supported.\n"); |
| 335 | return 0; |
| 336 | } |
| 337 | |
| 338 | /** |
| 339 | * i40e_get_fcoe_tc_map - Return TC map for FCoE APP |
| 340 | * @pf: pointer to pf |
| 341 | * |
| 342 | **/ |
| 343 | u8 i40e_get_fcoe_tc_map(struct i40e_pf *pf) |
| 344 | { |
| 345 | struct i40e_ieee_app_priority_table app; |
| 346 | struct i40e_hw *hw = &pf->hw; |
| 347 | u8 enabled_tc = 0; |
| 348 | u8 tc, i; |
| 349 | /* Get the FCoE APP TLV */ |
| 350 | struct i40e_dcbx_config *dcbcfg = &hw->local_dcbx_config; |
| 351 | |
| 352 | for (i = 0; i < dcbcfg->numapps; i++) { |
| 353 | app = dcbcfg->app[i]; |
| 354 | if (app.selector == IEEE_8021QAZ_APP_SEL_ETHERTYPE && |
| 355 | app.protocolid == ETH_P_FCOE) { |
| 356 | tc = dcbcfg->etscfg.prioritytable[app.priority]; |
| 357 | enabled_tc |= (1 << tc); |
| 358 | break; |
| 359 | } |
| 360 | } |
| 361 | |
| 362 | /* TC0 if there is no TC defined for FCoE APP TLV */ |
| 363 | enabled_tc = enabled_tc ? enabled_tc : 0x1; |
| 364 | |
| 365 | return enabled_tc; |
| 366 | } |
| 367 | |
| 368 | /** |
| 369 | * i40e_fcoe_vsi_init - prepares the VSI context for creating a FCoE VSI |
| 370 | * @vsi: pointer to the associated VSI struct |
| 371 | * @ctxt: pointer to the associated VSI context to be passed to HW |
| 372 | * |
| 373 | * Returns 0 on success or < 0 on error |
| 374 | **/ |
| 375 | int i40e_fcoe_vsi_init(struct i40e_vsi *vsi, struct i40e_vsi_context *ctxt) |
| 376 | { |
| 377 | struct i40e_aqc_vsi_properties_data *info = &ctxt->info; |
| 378 | struct i40e_pf *pf = vsi->back; |
| 379 | struct i40e_hw *hw = &pf->hw; |
| 380 | u8 enabled_tc = 0; |
| 381 | |
| 382 | if (!(pf->flags & I40E_FLAG_FCOE_ENABLED)) { |
| 383 | dev_err(&pf->pdev->dev, |
| 384 | "FCoE is not enabled for this device\n"); |
| 385 | return -EPERM; |
| 386 | } |
| 387 | |
| 388 | /* initialize the hardware for FCoE */ |
| 389 | ctxt->pf_num = hw->pf_id; |
| 390 | ctxt->vf_num = 0; |
| 391 | ctxt->uplink_seid = vsi->uplink_seid; |
| 392 | ctxt->connection_type = 0x1; |
| 393 | ctxt->flags = I40E_AQ_VSI_TYPE_PF; |
| 394 | |
| 395 | /* FCoE VSI would need the following sections */ |
| 396 | info->valid_sections |= cpu_to_le16(I40E_AQ_VSI_PROP_SWITCH_VALID | |
| 397 | I40E_AQ_VSI_PROP_QUEUE_OPT_VALID); |
| 398 | |
| 399 | /* FCoE VSI does not need these sections */ |
| 400 | info->valid_sections &= cpu_to_le16(~(I40E_AQ_VSI_PROP_SECURITY_VALID | |
| 401 | I40E_AQ_VSI_PROP_VLAN_VALID | |
| 402 | I40E_AQ_VSI_PROP_CAS_PV_VALID | |
| 403 | I40E_AQ_VSI_PROP_INGRESS_UP_VALID | |
| 404 | I40E_AQ_VSI_PROP_EGRESS_UP_VALID)); |
| 405 | |
| 406 | enabled_tc = i40e_get_fcoe_tc_map(pf); |
| 407 | i40e_vsi_setup_queue_map(vsi, ctxt, enabled_tc, true); |
| 408 | |
| 409 | /* set up queue option section: only enable FCoE */ |
| 410 | info->queueing_opt_flags = I40E_AQ_VSI_QUE_OPT_FCOE_ENA; |
| 411 | |
| 412 | return 0; |
| 413 | } |
| 414 | |
| 415 | /** |
| 416 | * i40e_fcoe_enable - this is the implementation of ndo_fcoe_enable, |
| 417 | * indicating the upper FCoE protocol stack is ready to use FCoE |
| 418 | * offload features. |
| 419 | * |
| 420 | * @netdev: pointer to the netdev that FCoE is created on |
| 421 | * |
| 422 | * Returns 0 on success |
| 423 | * |
| 424 | * in RTNL |
| 425 | * |
| 426 | **/ |
| 427 | int i40e_fcoe_enable(struct net_device *netdev) |
| 428 | { |
| 429 | struct i40e_netdev_priv *np = netdev_priv(netdev); |
| 430 | struct i40e_vsi *vsi = np->vsi; |
| 431 | struct i40e_pf *pf = vsi->back; |
| 432 | struct i40e_fcoe *fcoe = &pf->fcoe; |
| 433 | |
| 434 | if (!(pf->flags & I40E_FLAG_FCOE_ENABLED)) { |
| 435 | netdev_err(netdev, "HW does not support FCoE.\n"); |
| 436 | return -ENODEV; |
| 437 | } |
| 438 | |
| 439 | if (vsi->type != I40E_VSI_FCOE) { |
| 440 | netdev_err(netdev, "interface does not support FCoE.\n"); |
| 441 | return -EBUSY; |
| 442 | } |
| 443 | |
| 444 | atomic_inc(&fcoe->refcnt); |
| 445 | |
| 446 | return 0; |
| 447 | } |
| 448 | |
| 449 | /** |
| 450 | * i40e_fcoe_disable- disables FCoE for upper FCoE protocol stack. |
| 451 | * @dev: pointer to the netdev that FCoE is created on |
| 452 | * |
| 453 | * Returns 0 on success |
| 454 | * |
| 455 | **/ |
| 456 | int i40e_fcoe_disable(struct net_device *netdev) |
| 457 | { |
| 458 | struct i40e_netdev_priv *np = netdev_priv(netdev); |
| 459 | struct i40e_vsi *vsi = np->vsi; |
| 460 | struct i40e_pf *pf = vsi->back; |
| 461 | struct i40e_fcoe *fcoe = &pf->fcoe; |
| 462 | |
| 463 | if (!(pf->flags & I40E_FLAG_FCOE_ENABLED)) { |
| 464 | netdev_err(netdev, "device does not support FCoE\n"); |
| 465 | return -ENODEV; |
| 466 | } |
| 467 | if (vsi->type != I40E_VSI_FCOE) |
| 468 | return -EBUSY; |
| 469 | |
| 470 | if (!atomic_dec_and_test(&fcoe->refcnt)) |
| 471 | return -EINVAL; |
| 472 | |
| 473 | netdev_info(netdev, "FCoE disabled\n"); |
| 474 | |
| 475 | return 0; |
| 476 | } |
| 477 | |
| 478 | /** |
| 479 | * i40e_fcoe_dma_pool_free - free the per cpu pool for FCoE DDP |
| 480 | * @fcoe: the FCoE sw object |
| 481 | * @dev: the device that the pool is associated with |
| 482 | * @cpu: the cpu for this pool |
| 483 | * |
| 484 | **/ |
| 485 | static void i40e_fcoe_dma_pool_free(struct i40e_fcoe *fcoe, |
| 486 | struct device *dev, |
| 487 | unsigned int cpu) |
| 488 | { |
| 489 | struct i40e_fcoe_ddp_pool *ddp_pool; |
| 490 | |
| 491 | ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu); |
| 492 | if (!ddp_pool->pool) { |
| 493 | dev_warn(dev, "DDP pool already freed for cpu %d\n", cpu); |
| 494 | return; |
| 495 | } |
| 496 | dma_pool_destroy(ddp_pool->pool); |
| 497 | ddp_pool->pool = NULL; |
| 498 | } |
| 499 | |
| 500 | /** |
| 501 | * i40e_fcoe_dma_pool_create - per cpu pool for FCoE DDP |
| 502 | * @fcoe: the FCoE sw object |
| 503 | * @dev: the device that the pool is associated with |
| 504 | * @cpu: the cpu for this pool |
| 505 | * |
| 506 | * Returns 0 on successful or non zero on failure |
| 507 | * |
| 508 | **/ |
| 509 | static int i40e_fcoe_dma_pool_create(struct i40e_fcoe *fcoe, |
| 510 | struct device *dev, |
| 511 | unsigned int cpu) |
| 512 | { |
| 513 | struct i40e_fcoe_ddp_pool *ddp_pool; |
| 514 | struct dma_pool *pool; |
| 515 | char pool_name[32]; |
| 516 | |
| 517 | ddp_pool = per_cpu_ptr(fcoe->ddp_pool, cpu); |
| 518 | if (ddp_pool && ddp_pool->pool) { |
| 519 | dev_warn(dev, "DDP pool already allocated for cpu %d\n", cpu); |
| 520 | return 0; |
| 521 | } |
| 522 | snprintf(pool_name, sizeof(pool_name), "i40e_fcoe_ddp_%d", cpu); |
| 523 | pool = dma_pool_create(pool_name, dev, I40E_FCOE_DDP_PTR_MAX, |
| 524 | I40E_FCOE_DDP_PTR_ALIGN, PAGE_SIZE); |
| 525 | if (!pool) { |
| 526 | dev_err(dev, "dma_pool_create %s failed\n", pool_name); |
| 527 | return -ENOMEM; |
| 528 | } |
| 529 | ddp_pool->pool = pool; |
| 530 | return 0; |
| 531 | } |
| 532 | |
| 533 | /** |
| 534 | * i40e_fcoe_free_ddp_resources - release FCoE DDP resources |
| 535 | * @vsi: the vsi FCoE is associated with |
| 536 | * |
| 537 | **/ |
| 538 | void i40e_fcoe_free_ddp_resources(struct i40e_vsi *vsi) |
| 539 | { |
| 540 | struct i40e_pf *pf = vsi->back; |
| 541 | struct i40e_fcoe *fcoe = &pf->fcoe; |
| 542 | int cpu, i; |
| 543 | |
| 544 | /* do nothing if not FCoE VSI */ |
| 545 | if (vsi->type != I40E_VSI_FCOE) |
| 546 | return; |
| 547 | |
| 548 | /* do nothing if no DDP pools were allocated */ |
| 549 | if (!fcoe->ddp_pool) |
| 550 | return; |
| 551 | |
| 552 | for (i = 0; i < I40E_FCOE_DDP_MAX; i++) |
| 553 | i40e_fcoe_ddp_put(vsi->netdev, i); |
| 554 | |
| 555 | for_each_possible_cpu(cpu) |
| 556 | i40e_fcoe_dma_pool_free(fcoe, &pf->pdev->dev, cpu); |
| 557 | |
| 558 | free_percpu(fcoe->ddp_pool); |
| 559 | fcoe->ddp_pool = NULL; |
| 560 | |
| 561 | netdev_info(vsi->netdev, "VSI %d,%d FCoE DDP resources released\n", |
| 562 | vsi->id, vsi->seid); |
| 563 | } |
| 564 | |
| 565 | /** |
| 566 | * i40e_fcoe_setup_ddp_resources - allocate per cpu DDP resources |
| 567 | * @vsi: the VSI FCoE is associated with |
| 568 | * |
| 569 | * Returns 0 on successful or non zero on failure |
| 570 | * |
| 571 | **/ |
| 572 | int i40e_fcoe_setup_ddp_resources(struct i40e_vsi *vsi) |
| 573 | { |
| 574 | struct i40e_pf *pf = vsi->back; |
| 575 | struct device *dev = &pf->pdev->dev; |
| 576 | struct i40e_fcoe *fcoe = &pf->fcoe; |
| 577 | unsigned int cpu; |
| 578 | int i; |
| 579 | |
| 580 | if (vsi->type != I40E_VSI_FCOE) |
| 581 | return -ENODEV; |
| 582 | |
| 583 | /* do nothing if no DDP pools were allocated */ |
| 584 | if (fcoe->ddp_pool) |
| 585 | return -EEXIST; |
| 586 | |
| 587 | /* allocate per CPU memory to track DDP pools */ |
| 588 | fcoe->ddp_pool = alloc_percpu(struct i40e_fcoe_ddp_pool); |
| 589 | if (!fcoe->ddp_pool) { |
| 590 | dev_err(&pf->pdev->dev, "failed to allocate percpu DDP\n"); |
| 591 | return -ENOMEM; |
| 592 | } |
| 593 | |
| 594 | /* allocate pci pool for each cpu */ |
| 595 | for_each_possible_cpu(cpu) { |
| 596 | if (!i40e_fcoe_dma_pool_create(fcoe, dev, cpu)) |
| 597 | continue; |
| 598 | |
| 599 | dev_err(dev, "failed to alloc DDP pool on cpu:%d\n", cpu); |
| 600 | i40e_fcoe_free_ddp_resources(vsi); |
| 601 | return -ENOMEM; |
| 602 | } |
| 603 | |
| 604 | /* initialize the sw context */ |
| 605 | for (i = 0; i < I40E_FCOE_DDP_MAX; i++) |
| 606 | i40e_fcoe_ddp_clear(&fcoe->ddp[i]); |
| 607 | |
| 608 | netdev_info(vsi->netdev, "VSI %d,%d FCoE DDP resources allocated\n", |
| 609 | vsi->id, vsi->seid); |
| 610 | |
| 611 | return 0; |
| 612 | } |
| 613 | |
| 614 | /** |
| 615 | * i40e_fcoe_handle_status - check the Programming Status for FCoE |
| 616 | * @rx_ring: the Rx ring for this descriptor |
| 617 | * @rx_desc: the Rx descriptor for Programming Status, not a packet descriptor. |
| 618 | * |
| 619 | * Check if this is the Rx Programming Status descriptor write-back for FCoE. |
| 620 | * This is used to verify if the context/filter programming or invalidation |
| 621 | * requested by SW to the HW is successful or not and take actions accordingly. |
| 622 | **/ |
| 623 | void i40e_fcoe_handle_status(struct i40e_ring *rx_ring, |
| 624 | union i40e_rx_desc *rx_desc, u8 prog_id) |
| 625 | { |
| 626 | struct i40e_pf *pf = rx_ring->vsi->back; |
| 627 | struct i40e_fcoe *fcoe = &pf->fcoe; |
| 628 | struct i40e_fcoe_ddp *ddp; |
| 629 | u32 error; |
| 630 | u16 xid; |
| 631 | u64 qw; |
| 632 | |
| 633 | /* we only care for FCoE here */ |
| 634 | if (!i40e_fcoe_progid_is_fcoe(prog_id)) |
| 635 | return; |
| 636 | |
| 637 | xid = le32_to_cpu(rx_desc->wb.qword0.hi_dword.fcoe_param) & |
| 638 | (I40E_FCOE_DDP_MAX - 1); |
| 639 | |
| 640 | if (!i40e_fcoe_xid_is_valid(xid)) |
| 641 | return; |
| 642 | |
| 643 | ddp = &fcoe->ddp[xid]; |
| 644 | WARN_ON(xid != ddp->xid); |
| 645 | |
| 646 | qw = le64_to_cpu(rx_desc->wb.qword1.status_error_len); |
| 647 | error = (qw & I40E_RX_PROG_STATUS_DESC_QW1_ERROR_MASK) >> |
| 648 | I40E_RX_PROG_STATUS_DESC_QW1_ERROR_SHIFT; |
| 649 | |
| 650 | /* DDP context programming status: failure or success */ |
| 651 | if (prog_id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_PROG_STATUS) { |
| 652 | if (I40E_RX_PROG_FCOE_ERROR_TBL_FULL(error)) { |
| 653 | dev_err(&pf->pdev->dev, "xid %x ddp->xid %x TABLE FULL\n", |
| 654 | xid, ddp->xid); |
| 655 | ddp->prerr |= I40E_RX_PROG_FCOE_ERROR_TBL_FULL_BIT; |
| 656 | } |
| 657 | if (I40E_RX_PROG_FCOE_ERROR_CONFLICT(error)) { |
| 658 | dev_err(&pf->pdev->dev, "xid %x ddp->xid %x CONFLICT\n", |
| 659 | xid, ddp->xid); |
| 660 | ddp->prerr |= I40E_RX_PROG_FCOE_ERROR_CONFLICT_BIT; |
| 661 | } |
| 662 | } |
| 663 | |
| 664 | /* DDP context invalidation status: failure or success */ |
| 665 | if (prog_id == I40E_RX_PROG_STATUS_DESC_FCOE_CTXT_INVL_STATUS) { |
| 666 | if (I40E_RX_PROG_FCOE_ERROR_INVLFAIL(error)) { |
| 667 | dev_err(&pf->pdev->dev, "xid %x ddp->xid %x INVALIDATION FAILURE\n", |
| 668 | xid, ddp->xid); |
| 669 | ddp->prerr |= I40E_RX_PROG_FCOE_ERROR_INVLFAIL_BIT; |
| 670 | } |
| 671 | /* clear the flag so we can retry invalidation */ |
| 672 | clear_bit(__I40E_FCOE_DDP_ABORTED, &ddp->flags); |
| 673 | } |
| 674 | |
| 675 | /* unmap DMA */ |
| 676 | i40e_fcoe_ddp_unmap(pf, ddp); |
| 677 | i40e_fcoe_ddp_clear(ddp); |
| 678 | } |
| 679 | |
| 680 | /** |
| 681 | * i40e_fcoe_handle_offload - check ddp status and mark it done |
| 682 | * @adapter: i40e adapter |
| 683 | * @rx_desc: advanced rx descriptor |
| 684 | * @skb: the skb holding the received data |
| 685 | * |
| 686 | * This checks ddp status. |
| 687 | * |
| 688 | * Returns : < 0 indicates an error or not a FCOE ddp, 0 indicates |
| 689 | * not passing the skb to ULD, > 0 indicates is the length of data |
| 690 | * being ddped. |
| 691 | * |
| 692 | **/ |
| 693 | int i40e_fcoe_handle_offload(struct i40e_ring *rx_ring, |
| 694 | union i40e_rx_desc *rx_desc, |
| 695 | struct sk_buff *skb) |
| 696 | { |
| 697 | struct i40e_pf *pf = rx_ring->vsi->back; |
| 698 | struct i40e_fcoe *fcoe = &pf->fcoe; |
| 699 | struct fc_frame_header *fh = NULL; |
| 700 | struct i40e_fcoe_ddp *ddp = NULL; |
| 701 | u32 status, fltstat; |
| 702 | u32 error, fcerr; |
| 703 | int rc = -EINVAL; |
| 704 | u16 ptype; |
| 705 | u16 xid; |
| 706 | u64 qw; |
| 707 | |
| 708 | /* check this rxd is for programming status */ |
| 709 | qw = le64_to_cpu(rx_desc->wb.qword1.status_error_len); |
| 710 | /* packet descriptor, check packet type */ |
| 711 | ptype = (qw & I40E_RXD_QW1_PTYPE_MASK) >> I40E_RXD_QW1_PTYPE_SHIFT; |
| 712 | if (!i40e_rx_is_fcoe(ptype)) |
| 713 | goto out_no_ddp; |
| 714 | |
| 715 | error = (qw & I40E_RXD_QW1_ERROR_MASK) >> I40E_RXD_QW1_ERROR_SHIFT; |
| 716 | fcerr = (error >> I40E_RX_DESC_ERROR_L3L4E_SHIFT) & |
| 717 | I40E_RX_DESC_FCOE_ERROR_MASK; |
| 718 | |
| 719 | /* check stateless offload error */ |
| 720 | if (unlikely(fcerr == I40E_RX_DESC_ERROR_L3L4E_PROT)) { |
| 721 | dev_err(&pf->pdev->dev, "Protocol Error\n"); |
| 722 | skb->ip_summed = CHECKSUM_NONE; |
| 723 | } else { |
| 724 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
| 725 | } |
| 726 | |
| 727 | /* check hw status on ddp */ |
| 728 | status = (qw & I40E_RXD_QW1_STATUS_MASK) >> I40E_RXD_QW1_STATUS_SHIFT; |
| 729 | fltstat = (status >> I40E_RX_DESC_STATUS_FLTSTAT_SHIFT) & |
| 730 | I40E_RX_DESC_FLTSTAT_FCMASK; |
| 731 | |
| 732 | /* now we are ready to check DDP */ |
| 733 | fh = i40e_fcoe_fc_frame_header(skb); |
| 734 | xid = i40e_fcoe_fc_get_xid(fh); |
| 735 | if (!i40e_fcoe_xid_is_valid(xid)) |
| 736 | goto out_no_ddp; |
| 737 | |
| 738 | /* non DDP normal receive, return to the protocol stack */ |
| 739 | if (fltstat == I40E_RX_DESC_FLTSTAT_NOMTCH) |
| 740 | goto out_no_ddp; |
| 741 | |
| 742 | /* do we have a sw ddp context setup ? */ |
| 743 | ddp = &fcoe->ddp[xid]; |
| 744 | if (!ddp->sgl) |
| 745 | goto out_no_ddp; |
| 746 | |
| 747 | /* fetch xid from hw rxd wb, which should match up the sw ctxt */ |
| 748 | xid = le16_to_cpu(rx_desc->wb.qword0.lo_dword.mirr_fcoe.fcoe_ctx_id); |
| 749 | if (ddp->xid != xid) { |
| 750 | dev_err(&pf->pdev->dev, "xid 0x%x does not match ctx_xid 0x%x\n", |
| 751 | ddp->xid, xid); |
| 752 | goto out_put_ddp; |
| 753 | } |
| 754 | |
| 755 | /* the same exchange has already errored out */ |
| 756 | if (ddp->fcerr) { |
| 757 | dev_err(&pf->pdev->dev, "xid 0x%x fcerr 0x%x reported fcer 0x%x\n", |
| 758 | xid, ddp->fcerr, fcerr); |
| 759 | goto out_put_ddp; |
| 760 | } |
| 761 | |
| 762 | /* fcoe param is valid by now with correct DDPed length */ |
| 763 | ddp->len = le32_to_cpu(rx_desc->wb.qword0.hi_dword.fcoe_param); |
| 764 | ddp->fcerr = fcerr; |
| 765 | /* header posting only, useful only for target mode and debugging */ |
| 766 | if (fltstat == I40E_RX_DESC_FLTSTAT_DDP) { |
| 767 | /* For target mode, we get header of the last packet but it |
| 768 | * does not have the FCoE trailer field, i.e., CRC and EOF |
| 769 | * Ordered Set since they are offloaded by the HW, so fill |
| 770 | * it up correspondingly to allow the packet to pass through |
| 771 | * to the upper protocol stack. |
| 772 | */ |
| 773 | u32 f_ctl = ntoh24(fh->fh_f_ctl); |
| 774 | |
| 775 | if ((f_ctl & FC_FC_END_SEQ) && |
| 776 | (fh->fh_r_ctl == FC_RCTL_DD_SOL_DATA)) { |
| 777 | struct fcoe_crc_eof *crc = NULL; |
| 778 | |
| 779 | crc = (struct fcoe_crc_eof *)skb_put(skb, sizeof(*crc)); |
| 780 | crc->fcoe_eof = FC_EOF_T; |
| 781 | } else { |
| 782 | /* otherwise, drop the header only frame */ |
| 783 | rc = 0; |
| 784 | goto out_no_ddp; |
| 785 | } |
| 786 | } |
| 787 | |
| 788 | out_put_ddp: |
| 789 | /* either we got RSP or we have an error, unmap DMA in both cases */ |
| 790 | i40e_fcoe_ddp_unmap(pf, ddp); |
| 791 | if (ddp->len && !ddp->fcerr) { |
| 792 | int pkts; |
| 793 | |
| 794 | rc = ddp->len; |
| 795 | i40e_fcoe_ddp_clear(ddp); |
| 796 | ddp->len = rc; |
| 797 | pkts = DIV_ROUND_UP(rc, 2048); |
| 798 | rx_ring->stats.bytes += rc; |
| 799 | rx_ring->stats.packets += pkts; |
| 800 | rx_ring->q_vector->rx.total_bytes += rc; |
| 801 | rx_ring->q_vector->rx.total_packets += pkts; |
| 802 | set_bit(__I40E_FCOE_DDP_DONE, &ddp->flags); |
| 803 | } |
| 804 | |
| 805 | out_no_ddp: |
| 806 | return rc; |
| 807 | } |
| 808 | |
| 809 | /** |
| 810 | * i40e_fcoe_ddp_setup - called to set up ddp context |
| 811 | * @netdev: the corresponding net_device |
| 812 | * @xid: the exchange id requesting ddp |
| 813 | * @sgl: the scatter-gather list for this request |
| 814 | * @sgc: the number of scatter-gather items |
| 815 | * @target_mode: indicates this is a DDP request for target |
| 816 | * |
| 817 | * Returns : 1 for success and 0 for no DDP on this I/O |
| 818 | **/ |
| 819 | static int i40e_fcoe_ddp_setup(struct net_device *netdev, u16 xid, |
| 820 | struct scatterlist *sgl, unsigned int sgc, |
| 821 | int target_mode) |
| 822 | { |
| 823 | static const unsigned int bufflen = I40E_FCOE_DDP_BUF_MIN; |
| 824 | struct i40e_netdev_priv *np = netdev_priv(netdev); |
| 825 | struct i40e_fcoe_ddp_pool *ddp_pool; |
| 826 | struct i40e_pf *pf = np->vsi->back; |
| 827 | struct i40e_fcoe *fcoe = &pf->fcoe; |
| 828 | unsigned int i, j, dmacount; |
| 829 | struct i40e_fcoe_ddp *ddp; |
| 830 | unsigned int firstoff = 0; |
| 831 | unsigned int thisoff = 0; |
| 832 | unsigned int thislen = 0; |
| 833 | struct scatterlist *sg; |
| 834 | dma_addr_t addr = 0; |
| 835 | unsigned int len; |
| 836 | |
| 837 | if (xid >= I40E_FCOE_DDP_MAX) { |
| 838 | dev_warn(&pf->pdev->dev, "xid=0x%x out-of-range\n", xid); |
| 839 | return 0; |
| 840 | } |
| 841 | |
| 842 | /* no DDP if we are already down or resetting */ |
| 843 | if (test_bit(__I40E_DOWN, &pf->state) || |
| 844 | test_bit(__I40E_NEEDS_RESTART, &pf->state)) { |
| 845 | dev_info(&pf->pdev->dev, "xid=0x%x device in reset/down\n", |
| 846 | xid); |
| 847 | return 0; |
| 848 | } |
| 849 | |
| 850 | ddp = &fcoe->ddp[xid]; |
| 851 | if (ddp->sgl) { |
| 852 | dev_info(&pf->pdev->dev, "xid 0x%x w/ non-null sgl=%p nents=%d\n", |
| 853 | xid, ddp->sgl, ddp->sgc); |
| 854 | return 0; |
| 855 | } |
| 856 | i40e_fcoe_ddp_clear(ddp); |
| 857 | |
| 858 | if (!fcoe->ddp_pool) { |
| 859 | dev_info(&pf->pdev->dev, "No DDP pool, xid 0x%x\n", xid); |
| 860 | return 0; |
| 861 | } |
| 862 | |
| 863 | ddp_pool = per_cpu_ptr(fcoe->ddp_pool, get_cpu()); |
| 864 | if (!ddp_pool->pool) { |
| 865 | dev_info(&pf->pdev->dev, "No percpu ddp pool, xid 0x%x\n", xid); |
| 866 | goto out_noddp; |
| 867 | } |
| 868 | |
| 869 | /* setup dma from scsi command sgl */ |
| 870 | dmacount = dma_map_sg(&pf->pdev->dev, sgl, sgc, DMA_FROM_DEVICE); |
| 871 | if (dmacount == 0) { |
| 872 | dev_info(&pf->pdev->dev, "dma_map_sg for sgl %p, sgc %d failed\n", |
| 873 | sgl, sgc); |
| 874 | goto out_noddp_unmap; |
| 875 | } |
| 876 | |
| 877 | /* alloc the udl from our ddp pool */ |
| 878 | ddp->udl = dma_pool_alloc(ddp_pool->pool, GFP_ATOMIC, &ddp->udp); |
| 879 | if (!ddp->udl) { |
| 880 | dev_info(&pf->pdev->dev, |
| 881 | "Failed allocated ddp context, xid 0x%x\n", xid); |
| 882 | goto out_noddp_unmap; |
| 883 | } |
| 884 | |
| 885 | j = 0; |
| 886 | ddp->len = 0; |
| 887 | for_each_sg(sgl, sg, dmacount, i) { |
| 888 | addr = sg_dma_address(sg); |
| 889 | len = sg_dma_len(sg); |
| 890 | ddp->len += len; |
| 891 | while (len) { |
| 892 | /* max number of buffers allowed in one DDP context */ |
| 893 | if (j >= I40E_FCOE_DDP_BUFFCNT_MAX) { |
| 894 | dev_info(&pf->pdev->dev, |
| 895 | "xid=%x:%d,%d,%d:addr=%llx not enough descriptors\n", |
| 896 | xid, i, j, dmacount, (u64)addr); |
| 897 | goto out_noddp_free; |
| 898 | } |
| 899 | |
| 900 | /* get the offset of length of current buffer */ |
| 901 | thisoff = addr & ((dma_addr_t)bufflen - 1); |
| 902 | thislen = min_t(unsigned int, (bufflen - thisoff), len); |
| 903 | /* all but the 1st buffer (j == 0) |
| 904 | * must be aligned on bufflen |
| 905 | */ |
| 906 | if ((j != 0) && (thisoff)) |
| 907 | goto out_noddp_free; |
| 908 | |
| 909 | /* all but the last buffer |
| 910 | * ((i == (dmacount - 1)) && (thislen == len)) |
| 911 | * must end at bufflen |
| 912 | */ |
| 913 | if (((i != (dmacount - 1)) || (thislen != len)) && |
| 914 | ((thislen + thisoff) != bufflen)) |
| 915 | goto out_noddp_free; |
| 916 | |
| 917 | ddp->udl[j] = (u64)(addr - thisoff); |
| 918 | /* only the first buffer may have none-zero offset */ |
| 919 | if (j == 0) |
| 920 | firstoff = thisoff; |
| 921 | len -= thislen; |
| 922 | addr += thislen; |
| 923 | j++; |
| 924 | } |
| 925 | } |
| 926 | /* only the last buffer may have non-full bufflen */ |
| 927 | ddp->lastsize = thisoff + thislen; |
| 928 | ddp->firstoff = firstoff; |
| 929 | ddp->list_len = j; |
| 930 | ddp->pool = ddp_pool->pool; |
| 931 | ddp->sgl = sgl; |
| 932 | ddp->sgc = sgc; |
| 933 | ddp->xid = xid; |
| 934 | if (target_mode) |
| 935 | set_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags); |
| 936 | set_bit(__I40E_FCOE_DDP_INITALIZED, &ddp->flags); |
| 937 | |
| 938 | put_cpu(); |
| 939 | return 1; /* Success */ |
| 940 | |
| 941 | out_noddp_free: |
| 942 | dma_pool_free(ddp->pool, ddp->udl, ddp->udp); |
| 943 | i40e_fcoe_ddp_clear(ddp); |
| 944 | |
| 945 | out_noddp_unmap: |
| 946 | dma_unmap_sg(&pf->pdev->dev, sgl, sgc, DMA_FROM_DEVICE); |
| 947 | out_noddp: |
| 948 | put_cpu(); |
| 949 | return 0; |
| 950 | } |
| 951 | |
| 952 | /** |
| 953 | * i40e_fcoe_ddp_get - called to set up ddp context in initiator mode |
| 954 | * @netdev: the corresponding net_device |
| 955 | * @xid: the exchange id requesting ddp |
| 956 | * @sgl: the scatter-gather list for this request |
| 957 | * @sgc: the number of scatter-gather items |
| 958 | * |
| 959 | * This is the implementation of net_device_ops.ndo_fcoe_ddp_setup |
| 960 | * and is expected to be called from ULD, e.g., FCP layer of libfc |
| 961 | * to set up ddp for the corresponding xid of the given sglist for |
| 962 | * the corresponding I/O. |
| 963 | * |
| 964 | * Returns : 1 for success and 0 for no ddp |
| 965 | **/ |
| 966 | static int i40e_fcoe_ddp_get(struct net_device *netdev, u16 xid, |
| 967 | struct scatterlist *sgl, unsigned int sgc) |
| 968 | { |
| 969 | return i40e_fcoe_ddp_setup(netdev, xid, sgl, sgc, 0); |
| 970 | } |
| 971 | |
| 972 | /** |
| 973 | * i40e_fcoe_ddp_target - called to set up ddp context in target mode |
| 974 | * @netdev: the corresponding net_device |
| 975 | * @xid: the exchange id requesting ddp |
| 976 | * @sgl: the scatter-gather list for this request |
| 977 | * @sgc: the number of scatter-gather items |
| 978 | * |
| 979 | * This is the implementation of net_device_ops.ndo_fcoe_ddp_target |
| 980 | * and is expected to be called from ULD, e.g., FCP layer of libfc |
| 981 | * to set up ddp for the corresponding xid of the given sglist for |
| 982 | * the corresponding I/O. The DDP in target mode is a write I/O request |
| 983 | * from the initiator. |
| 984 | * |
| 985 | * Returns : 1 for success and 0 for no ddp |
| 986 | **/ |
| 987 | static int i40e_fcoe_ddp_target(struct net_device *netdev, u16 xid, |
| 988 | struct scatterlist *sgl, unsigned int sgc) |
| 989 | { |
| 990 | return i40e_fcoe_ddp_setup(netdev, xid, sgl, sgc, 1); |
| 991 | } |
| 992 | |
| 993 | /** |
| 994 | * i40e_fcoe_program_ddp - programs the HW DDP related descriptors |
| 995 | * @tx_ring: transmit ring for this packet |
| 996 | * @skb: the packet to be sent out |
| 997 | * @sof: the SOF to indicate class of service |
| 998 | * |
| 999 | * Determine if it is READ/WRITE command, and finds out if there is |
| 1000 | * a matching SW DDP context for this command. DDP is applicable |
| 1001 | * only in case of READ if initiator or WRITE in case of |
| 1002 | * responder (via checking XFER_RDY). |
| 1003 | * |
| 1004 | * Note: caller checks sof and ddp sw context |
| 1005 | * |
| 1006 | * Returns : none |
| 1007 | * |
| 1008 | **/ |
| 1009 | static void i40e_fcoe_program_ddp(struct i40e_ring *tx_ring, |
| 1010 | struct sk_buff *skb, |
| 1011 | struct i40e_fcoe_ddp *ddp, u8 sof) |
| 1012 | { |
| 1013 | struct i40e_fcoe_filter_context_desc *filter_desc = NULL; |
| 1014 | struct i40e_fcoe_queue_context_desc *queue_desc = NULL; |
| 1015 | struct i40e_fcoe_ddp_context_desc *ddp_desc = NULL; |
| 1016 | struct i40e_pf *pf = tx_ring->vsi->back; |
| 1017 | u16 i = tx_ring->next_to_use; |
| 1018 | struct fc_frame_header *fh; |
| 1019 | u64 flags_rsvd_lanq = 0; |
| 1020 | bool target_mode; |
| 1021 | |
| 1022 | /* check if abort is still pending */ |
| 1023 | if (test_bit(__I40E_FCOE_DDP_ABORTED, &ddp->flags)) { |
| 1024 | dev_warn(&pf->pdev->dev, |
| 1025 | "DDP abort is still pending xid:%hx and ddp->flags:%lx:\n", |
| 1026 | ddp->xid, ddp->flags); |
| 1027 | return; |
| 1028 | } |
| 1029 | |
| 1030 | /* set the flag to indicate this is programmed */ |
| 1031 | if (test_and_set_bit(__I40E_FCOE_DDP_PROGRAMMED, &ddp->flags)) { |
| 1032 | dev_warn(&pf->pdev->dev, |
| 1033 | "DDP is already programmed for xid:%hx and ddp->flags:%lx:\n", |
| 1034 | ddp->xid, ddp->flags); |
| 1035 | return; |
| 1036 | } |
| 1037 | |
| 1038 | /* Prepare the DDP context descriptor */ |
| 1039 | ddp_desc = I40E_DDP_CONTEXT_DESC(tx_ring, i); |
| 1040 | i++; |
| 1041 | if (i == tx_ring->count) |
| 1042 | i = 0; |
| 1043 | |
| 1044 | ddp_desc->type_cmd_foff_lsize = |
| 1045 | cpu_to_le64(I40E_TX_DESC_DTYPE_DDP_CTX | |
| 1046 | ((u64)I40E_FCOE_DDP_CTX_DESC_BSIZE_4K << |
| 1047 | I40E_FCOE_DDP_CTX_QW1_CMD_SHIFT) | |
| 1048 | ((u64)ddp->firstoff << |
| 1049 | I40E_FCOE_DDP_CTX_QW1_FOFF_SHIFT) | |
| 1050 | ((u64)ddp->lastsize << |
| 1051 | I40E_FCOE_DDP_CTX_QW1_LSIZE_SHIFT)); |
| 1052 | ddp_desc->rsvd = cpu_to_le64(0); |
| 1053 | |
| 1054 | /* target mode needs last packet in the sequence */ |
| 1055 | target_mode = test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags); |
| 1056 | if (target_mode) |
| 1057 | ddp_desc->type_cmd_foff_lsize |= |
| 1058 | cpu_to_le64(I40E_FCOE_DDP_CTX_DESC_LASTSEQH); |
| 1059 | |
| 1060 | /* Prepare queue_context descriptor */ |
| 1061 | queue_desc = I40E_QUEUE_CONTEXT_DESC(tx_ring, i++); |
| 1062 | if (i == tx_ring->count) |
| 1063 | i = 0; |
| 1064 | queue_desc->dmaindx_fbase = cpu_to_le64(ddp->xid | ((u64)ddp->udp)); |
| 1065 | queue_desc->flen_tph = cpu_to_le64(ddp->list_len | |
| 1066 | ((u64)(I40E_FCOE_QUEUE_CTX_DESC_TPHRDESC | |
| 1067 | I40E_FCOE_QUEUE_CTX_DESC_TPHDATA) << |
| 1068 | I40E_FCOE_QUEUE_CTX_QW1_TPH_SHIFT)); |
| 1069 | |
| 1070 | /* Prepare filter_context_desc */ |
| 1071 | filter_desc = I40E_FILTER_CONTEXT_DESC(tx_ring, i); |
| 1072 | i++; |
| 1073 | if (i == tx_ring->count) |
| 1074 | i = 0; |
| 1075 | |
| 1076 | fh = (struct fc_frame_header *)skb_transport_header(skb); |
| 1077 | filter_desc->param = cpu_to_le32(ntohl(fh->fh_parm_offset)); |
| 1078 | filter_desc->seqn = cpu_to_le16(ntohs(fh->fh_seq_cnt)); |
| 1079 | filter_desc->rsvd_dmaindx = cpu_to_le16(ddp->xid << |
| 1080 | I40E_FCOE_FILTER_CTX_QW0_DMAINDX_SHIFT); |
| 1081 | |
| 1082 | flags_rsvd_lanq = I40E_FCOE_FILTER_CTX_DESC_CTYP_DDP; |
| 1083 | flags_rsvd_lanq |= (u64)(target_mode ? |
| 1084 | I40E_FCOE_FILTER_CTX_DESC_ENODE_RSP : |
| 1085 | I40E_FCOE_FILTER_CTX_DESC_ENODE_INIT); |
| 1086 | |
| 1087 | flags_rsvd_lanq |= (u64)((sof == FC_SOF_I2 || sof == FC_SOF_N2) ? |
| 1088 | I40E_FCOE_FILTER_CTX_DESC_FC_CLASS2 : |
| 1089 | I40E_FCOE_FILTER_CTX_DESC_FC_CLASS3); |
| 1090 | |
| 1091 | flags_rsvd_lanq |= ((u64)skb->queue_mapping << |
| 1092 | I40E_FCOE_FILTER_CTX_QW1_LANQINDX_SHIFT); |
| 1093 | filter_desc->flags_rsvd_lanq = cpu_to_le64(flags_rsvd_lanq); |
| 1094 | |
| 1095 | /* By this time, all offload related descriptors has been programmed */ |
| 1096 | tx_ring->next_to_use = i; |
| 1097 | } |
| 1098 | |
| 1099 | /** |
| 1100 | * i40e_fcoe_invalidate_ddp - invalidates DDP in case of abort |
| 1101 | * @tx_ring: transmit ring for this packet |
| 1102 | * @skb: the packet associated w/ this DDP invalidation, i.e., ABTS |
| 1103 | * @ddp: the SW DDP context for this DDP |
| 1104 | * |
| 1105 | * Programs the Tx context descriptor to do DDP invalidation. |
| 1106 | **/ |
| 1107 | static void i40e_fcoe_invalidate_ddp(struct i40e_ring *tx_ring, |
| 1108 | struct sk_buff *skb, |
| 1109 | struct i40e_fcoe_ddp *ddp) |
| 1110 | { |
| 1111 | struct i40e_tx_context_desc *context_desc; |
| 1112 | int i; |
| 1113 | |
| 1114 | if (test_and_set_bit(__I40E_FCOE_DDP_ABORTED, &ddp->flags)) |
| 1115 | return; |
| 1116 | |
| 1117 | i = tx_ring->next_to_use; |
| 1118 | context_desc = I40E_TX_CTXTDESC(tx_ring, i); |
| 1119 | i++; |
| 1120 | if (i == tx_ring->count) |
| 1121 | i = 0; |
| 1122 | |
| 1123 | context_desc->tunneling_params = cpu_to_le32(0); |
| 1124 | context_desc->l2tag2 = cpu_to_le16(0); |
| 1125 | context_desc->rsvd = cpu_to_le16(0); |
| 1126 | context_desc->type_cmd_tso_mss = cpu_to_le64( |
| 1127 | I40E_TX_DESC_DTYPE_FCOE_CTX | |
| 1128 | (I40E_FCOE_TX_CTX_DESC_OPCODE_DDP_CTX_INVL << |
| 1129 | I40E_TXD_CTX_QW1_CMD_SHIFT) | |
| 1130 | (I40E_FCOE_TX_CTX_DESC_OPCODE_SINGLE_SEND << |
| 1131 | I40E_TXD_CTX_QW1_CMD_SHIFT)); |
| 1132 | tx_ring->next_to_use = i; |
| 1133 | } |
| 1134 | |
| 1135 | /** |
| 1136 | * i40e_fcoe_handle_ddp - check we should setup or invalidate DDP |
| 1137 | * @tx_ring: transmit ring for this packet |
| 1138 | * @skb: the packet to be sent out |
| 1139 | * @sof: the SOF to indicate class of service |
| 1140 | * |
| 1141 | * Determine if it is ABTS/READ/XFER_RDY, and finds out if there is |
| 1142 | * a matching SW DDP context for this command. DDP is applicable |
| 1143 | * only in case of READ if initiator or WRITE in case of |
| 1144 | * responder (via checking XFER_RDY). In case this is an ABTS, send |
| 1145 | * just invalidate the context. |
| 1146 | **/ |
| 1147 | static void i40e_fcoe_handle_ddp(struct i40e_ring *tx_ring, |
| 1148 | struct sk_buff *skb, u8 sof) |
| 1149 | { |
| 1150 | struct i40e_pf *pf = tx_ring->vsi->back; |
| 1151 | struct i40e_fcoe *fcoe = &pf->fcoe; |
| 1152 | struct fc_frame_header *fh; |
| 1153 | struct i40e_fcoe_ddp *ddp; |
| 1154 | u32 f_ctl; |
| 1155 | u8 r_ctl; |
| 1156 | u16 xid; |
| 1157 | |
| 1158 | fh = (struct fc_frame_header *)skb_transport_header(skb); |
| 1159 | f_ctl = ntoh24(fh->fh_f_ctl); |
| 1160 | r_ctl = fh->fh_r_ctl; |
| 1161 | ddp = NULL; |
| 1162 | |
| 1163 | if ((r_ctl == FC_RCTL_DD_DATA_DESC) && (f_ctl & FC_FC_EX_CTX)) { |
| 1164 | /* exchange responder? if so, XFER_RDY for write */ |
| 1165 | xid = ntohs(fh->fh_rx_id); |
| 1166 | if (i40e_fcoe_xid_is_valid(xid)) { |
| 1167 | ddp = &fcoe->ddp[xid]; |
| 1168 | if ((ddp->xid == xid) && |
| 1169 | (test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags))) |
| 1170 | i40e_fcoe_program_ddp(tx_ring, skb, ddp, sof); |
| 1171 | } |
| 1172 | } else if (r_ctl == FC_RCTL_DD_UNSOL_CMD) { |
| 1173 | /* exchange originator, check READ cmd */ |
| 1174 | xid = ntohs(fh->fh_ox_id); |
| 1175 | if (i40e_fcoe_xid_is_valid(xid)) { |
| 1176 | ddp = &fcoe->ddp[xid]; |
| 1177 | if ((ddp->xid == xid) && |
| 1178 | (!test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags))) |
| 1179 | i40e_fcoe_program_ddp(tx_ring, skb, ddp, sof); |
| 1180 | } |
| 1181 | } else if (r_ctl == FC_RCTL_BA_ABTS) { |
| 1182 | /* exchange originator, check ABTS */ |
| 1183 | xid = ntohs(fh->fh_ox_id); |
| 1184 | if (i40e_fcoe_xid_is_valid(xid)) { |
| 1185 | ddp = &fcoe->ddp[xid]; |
| 1186 | if ((ddp->xid == xid) && |
| 1187 | (!test_bit(__I40E_FCOE_DDP_TARGET, &ddp->flags))) |
| 1188 | i40e_fcoe_invalidate_ddp(tx_ring, skb, ddp); |
| 1189 | } |
| 1190 | } |
| 1191 | } |
| 1192 | |
| 1193 | /** |
| 1194 | * i40e_fcoe_tso - set up FCoE TSO |
| 1195 | * @tx_ring: ring to send buffer on |
| 1196 | * @skb: send buffer |
| 1197 | * @tx_flags: collected send information |
| 1198 | * @hdr_len: the tso header length |
| 1199 | * @sof: the SOF to indicate class of service |
| 1200 | * |
| 1201 | * Note must already have sof checked to be either class 2 or class 3 before |
| 1202 | * calling this function. |
| 1203 | * |
| 1204 | * Returns 1 to indicate sequence segmentation offload is properly setup |
| 1205 | * or returns 0 to indicate no tso is needed, otherwise returns error |
| 1206 | * code to drop the frame. |
| 1207 | **/ |
| 1208 | static int i40e_fcoe_tso(struct i40e_ring *tx_ring, |
| 1209 | struct sk_buff *skb, |
| 1210 | u32 tx_flags, u8 *hdr_len, u8 sof) |
| 1211 | { |
| 1212 | struct i40e_tx_context_desc *context_desc; |
| 1213 | u32 cd_type, cd_cmd, cd_tso_len, cd_mss; |
| 1214 | struct fc_frame_header *fh; |
| 1215 | u64 cd_type_cmd_tso_mss; |
| 1216 | |
| 1217 | /* must match gso type as FCoE */ |
| 1218 | if (!skb_is_gso(skb)) |
| 1219 | return 0; |
| 1220 | |
| 1221 | /* is it the expected gso type for FCoE ?*/ |
| 1222 | if (skb_shinfo(skb)->gso_type != SKB_GSO_FCOE) { |
| 1223 | netdev_err(skb->dev, |
| 1224 | "wrong gso type %d:expecting SKB_GSO_FCOE\n", |
| 1225 | skb_shinfo(skb)->gso_type); |
| 1226 | return -EINVAL; |
| 1227 | } |
| 1228 | |
| 1229 | /* header and trailer are inserted by hw */ |
| 1230 | *hdr_len = skb_transport_offset(skb) + sizeof(struct fc_frame_header) + |
| 1231 | sizeof(struct fcoe_crc_eof); |
| 1232 | |
| 1233 | /* check sof to decide a class 2 or 3 TSO */ |
| 1234 | if (likely(i40e_fcoe_sof_is_class3(sof))) |
| 1235 | cd_cmd = I40E_FCOE_TX_CTX_DESC_OPCODE_TSO_FC_CLASS3; |
| 1236 | else |
| 1237 | cd_cmd = I40E_FCOE_TX_CTX_DESC_OPCODE_TSO_FC_CLASS2; |
| 1238 | |
| 1239 | /* param field valid? */ |
| 1240 | fh = (struct fc_frame_header *)skb_transport_header(skb); |
| 1241 | if (fh->fh_f_ctl[2] & FC_FC_REL_OFF) |
| 1242 | cd_cmd |= I40E_FCOE_TX_CTX_DESC_RELOFF; |
| 1243 | |
| 1244 | /* fill the field values */ |
| 1245 | cd_type = I40E_TX_DESC_DTYPE_FCOE_CTX; |
| 1246 | cd_tso_len = skb->len - *hdr_len; |
| 1247 | cd_mss = skb_shinfo(skb)->gso_size; |
| 1248 | cd_type_cmd_tso_mss = |
| 1249 | ((u64)cd_type << I40E_TXD_CTX_QW1_DTYPE_SHIFT) | |
| 1250 | ((u64)cd_cmd << I40E_TXD_CTX_QW1_CMD_SHIFT) | |
| 1251 | ((u64)cd_tso_len << I40E_TXD_CTX_QW1_TSO_LEN_SHIFT) | |
| 1252 | ((u64)cd_mss << I40E_TXD_CTX_QW1_MSS_SHIFT); |
| 1253 | |
| 1254 | /* grab the next descriptor */ |
| 1255 | context_desc = I40E_TX_CTXTDESC(tx_ring, tx_ring->next_to_use); |
| 1256 | tx_ring->next_to_use++; |
| 1257 | if (tx_ring->next_to_use == tx_ring->count) |
| 1258 | tx_ring->next_to_use = 0; |
| 1259 | |
| 1260 | context_desc->tunneling_params = 0; |
| 1261 | context_desc->l2tag2 = cpu_to_le16((tx_flags & I40E_TX_FLAGS_VLAN_MASK) |
| 1262 | >> I40E_TX_FLAGS_VLAN_SHIFT); |
| 1263 | context_desc->type_cmd_tso_mss = cpu_to_le64(cd_type_cmd_tso_mss); |
| 1264 | |
| 1265 | return 1; |
| 1266 | } |
| 1267 | |
| 1268 | /** |
| 1269 | * i40e_fcoe_tx_map - build the tx descriptor |
| 1270 | * @tx_ring: ring to send buffer on |
| 1271 | * @skb: send buffer |
| 1272 | * @first: first buffer info buffer to use |
| 1273 | * @tx_flags: collected send information |
| 1274 | * @hdr_len: ptr to the size of the packet header |
| 1275 | * @eof: the frame eof value |
| 1276 | * |
| 1277 | * Note, for FCoE, sof and eof are already checked |
| 1278 | **/ |
| 1279 | static void i40e_fcoe_tx_map(struct i40e_ring *tx_ring, |
| 1280 | struct sk_buff *skb, |
| 1281 | struct i40e_tx_buffer *first, |
| 1282 | u32 tx_flags, u8 hdr_len, u8 eof) |
| 1283 | { |
| 1284 | u32 td_offset = 0; |
| 1285 | u32 td_cmd = 0; |
| 1286 | u32 maclen; |
| 1287 | |
| 1288 | /* insert CRC */ |
| 1289 | td_cmd = I40E_TX_DESC_CMD_ICRC; |
| 1290 | |
| 1291 | /* setup MACLEN */ |
| 1292 | maclen = skb_network_offset(skb); |
| 1293 | if (tx_flags & I40E_TX_FLAGS_SW_VLAN) |
| 1294 | maclen += sizeof(struct vlan_hdr); |
| 1295 | |
| 1296 | if (skb->protocol == htons(ETH_P_FCOE)) { |
| 1297 | /* for FCoE, maclen should exclude ether type */ |
| 1298 | maclen -= 2; |
| 1299 | /* setup type as FCoE and EOF insertion */ |
| 1300 | td_cmd |= (I40E_TX_DESC_CMD_FCOET | i40e_fcoe_ctxt_eof(eof)); |
| 1301 | /* setup FCoELEN and FCLEN */ |
| 1302 | td_offset |= ((((sizeof(struct fcoe_hdr) + 2) >> 2) << |
| 1303 | I40E_TX_DESC_LENGTH_IPLEN_SHIFT) | |
| 1304 | ((sizeof(struct fc_frame_header) >> 2) << |
| 1305 | I40E_TX_DESC_LENGTH_L4_FC_LEN_SHIFT)); |
| 1306 | /* trim to exclude trailer */ |
| 1307 | pskb_trim(skb, skb->len - sizeof(struct fcoe_crc_eof)); |
| 1308 | } |
| 1309 | |
| 1310 | /* MACLEN is ether header length in words not bytes */ |
| 1311 | td_offset |= (maclen >> 1) << I40E_TX_DESC_LENGTH_MACLEN_SHIFT; |
| 1312 | |
| 1313 | return i40e_tx_map(tx_ring, skb, first, tx_flags, hdr_len, |
| 1314 | td_cmd, td_offset); |
| 1315 | } |
| 1316 | |
| 1317 | /** |
| 1318 | * i40e_fcoe_set_skb_header - adjust skb header point for FIP/FCoE/FC |
| 1319 | * @skb: the skb to be adjusted |
| 1320 | * |
| 1321 | * Returns true if this skb is a FCoE/FIP or VLAN carried FCoE/FIP and then |
| 1322 | * adjusts the skb header pointers correspondingly. Otherwise, returns false. |
| 1323 | **/ |
| 1324 | static inline int i40e_fcoe_set_skb_header(struct sk_buff *skb) |
| 1325 | { |
| 1326 | __be16 protocol = skb->protocol; |
| 1327 | |
| 1328 | skb_reset_mac_header(skb); |
| 1329 | skb->mac_len = sizeof(struct ethhdr); |
| 1330 | if (protocol == htons(ETH_P_8021Q)) { |
| 1331 | struct vlan_ethhdr *veth = (struct vlan_ethhdr *)eth_hdr(skb); |
| 1332 | |
| 1333 | protocol = veth->h_vlan_encapsulated_proto; |
| 1334 | skb->mac_len += sizeof(struct vlan_hdr); |
| 1335 | } |
| 1336 | |
| 1337 | /* FCoE or FIP only */ |
| 1338 | if ((protocol != htons(ETH_P_FIP)) && |
| 1339 | (protocol != htons(ETH_P_FCOE))) |
| 1340 | return -EINVAL; |
| 1341 | |
| 1342 | /* set header to L2 of FCoE/FIP */ |
| 1343 | skb_set_network_header(skb, skb->mac_len); |
| 1344 | if (protocol == htons(ETH_P_FIP)) |
| 1345 | return 0; |
| 1346 | |
| 1347 | /* set header to L3 of FC */ |
| 1348 | skb_set_transport_header(skb, skb->mac_len + sizeof(struct fcoe_hdr)); |
| 1349 | return 0; |
| 1350 | } |
| 1351 | |
| 1352 | /** |
| 1353 | * i40e_fcoe_xmit_frame - transmit buffer |
| 1354 | * @skb: send buffer |
| 1355 | * @netdev: the fcoe netdev |
| 1356 | * |
| 1357 | * Returns 0 if sent, else an error code |
| 1358 | **/ |
| 1359 | static netdev_tx_t i40e_fcoe_xmit_frame(struct sk_buff *skb, |
| 1360 | struct net_device *netdev) |
| 1361 | { |
| 1362 | struct i40e_netdev_priv *np = netdev_priv(skb->dev); |
| 1363 | struct i40e_vsi *vsi = np->vsi; |
| 1364 | struct i40e_ring *tx_ring = vsi->tx_rings[skb->queue_mapping]; |
| 1365 | struct i40e_tx_buffer *first; |
Vasu Dev | a1a6936 | 2014-08-01 13:27:02 -0700 | [diff] [blame] | 1366 | u32 tx_flags = 0; |
| 1367 | u8 hdr_len = 0; |
| 1368 | u8 sof = 0; |
| 1369 | u8 eof = 0; |
| 1370 | int fso; |
| 1371 | |
| 1372 | if (i40e_fcoe_set_skb_header(skb)) |
| 1373 | goto out_drop; |
| 1374 | |
| 1375 | if (!i40e_xmit_descriptor_count(skb, tx_ring)) |
| 1376 | return NETDEV_TX_BUSY; |
| 1377 | |
| 1378 | /* prepare the xmit flags */ |
| 1379 | if (i40e_tx_prepare_vlan_flags(skb, tx_ring, &tx_flags)) |
| 1380 | goto out_drop; |
| 1381 | |
| 1382 | /* record the location of the first descriptor for this packet */ |
| 1383 | first = &tx_ring->tx_bi[tx_ring->next_to_use]; |
| 1384 | |
Vasu Dev | a1a6936 | 2014-08-01 13:27:02 -0700 | [diff] [blame] | 1385 | /* FIP is a regular L2 traffic w/o offload */ |
Vasu Dev | 38e0043 | 2014-08-01 13:27:03 -0700 | [diff] [blame] | 1386 | if (skb->protocol == htons(ETH_P_FIP)) |
Vasu Dev | a1a6936 | 2014-08-01 13:27:02 -0700 | [diff] [blame] | 1387 | goto out_send; |
| 1388 | |
| 1389 | /* check sof and eof, only supports FC Class 2 or 3 */ |
| 1390 | if (i40e_fcoe_fc_sof(skb, &sof) || i40e_fcoe_fc_eof(skb, &eof)) { |
| 1391 | netdev_err(netdev, "SOF/EOF error:%02x - %02x\n", sof, eof); |
| 1392 | goto out_drop; |
| 1393 | } |
| 1394 | |
| 1395 | /* always do FCCRC for FCoE */ |
| 1396 | tx_flags |= I40E_TX_FLAGS_FCCRC; |
| 1397 | |
| 1398 | /* check we should do sequence offload */ |
| 1399 | fso = i40e_fcoe_tso(tx_ring, skb, tx_flags, &hdr_len, sof); |
| 1400 | if (fso < 0) |
| 1401 | goto out_drop; |
| 1402 | else if (fso) |
| 1403 | tx_flags |= I40E_TX_FLAGS_FSO; |
| 1404 | else |
| 1405 | i40e_fcoe_handle_ddp(tx_ring, skb, sof); |
| 1406 | |
| 1407 | out_send: |
| 1408 | /* send out the packet */ |
| 1409 | i40e_fcoe_tx_map(tx_ring, skb, first, tx_flags, hdr_len, eof); |
| 1410 | |
| 1411 | i40e_maybe_stop_tx(tx_ring, DESC_NEEDED); |
| 1412 | return NETDEV_TX_OK; |
| 1413 | |
| 1414 | out_drop: |
| 1415 | dev_kfree_skb_any(skb); |
| 1416 | return NETDEV_TX_OK; |
| 1417 | } |
| 1418 | |
| 1419 | /** |
| 1420 | * i40e_fcoe_change_mtu - NDO callback to change the Maximum Transfer Unit |
| 1421 | * @netdev: network interface device structure |
| 1422 | * @new_mtu: new value for maximum frame size |
| 1423 | * |
| 1424 | * Returns error as operation not permitted |
| 1425 | * |
| 1426 | **/ |
| 1427 | static int i40e_fcoe_change_mtu(struct net_device *netdev, int new_mtu) |
| 1428 | { |
| 1429 | netdev_warn(netdev, "MTU change is not supported on FCoE interfaces\n"); |
| 1430 | return -EPERM; |
| 1431 | } |
| 1432 | |
| 1433 | /** |
| 1434 | * i40e_fcoe_set_features - set the netdev feature flags |
| 1435 | * @netdev: ptr to the netdev being adjusted |
| 1436 | * @features: the feature set that the stack is suggesting |
| 1437 | * |
| 1438 | **/ |
| 1439 | static int i40e_fcoe_set_features(struct net_device *netdev, |
| 1440 | netdev_features_t features) |
| 1441 | { |
| 1442 | struct i40e_netdev_priv *np = netdev_priv(netdev); |
| 1443 | struct i40e_vsi *vsi = np->vsi; |
| 1444 | |
| 1445 | if (features & NETIF_F_HW_VLAN_CTAG_RX) |
| 1446 | i40e_vlan_stripping_enable(vsi); |
| 1447 | else |
| 1448 | i40e_vlan_stripping_disable(vsi); |
| 1449 | |
| 1450 | return 0; |
| 1451 | } |
| 1452 | |
| 1453 | |
| 1454 | static const struct net_device_ops i40e_fcoe_netdev_ops = { |
| 1455 | .ndo_open = i40e_open, |
| 1456 | .ndo_stop = i40e_close, |
| 1457 | .ndo_get_stats64 = i40e_get_netdev_stats_struct, |
| 1458 | .ndo_set_rx_mode = i40e_set_rx_mode, |
| 1459 | .ndo_validate_addr = eth_validate_addr, |
| 1460 | .ndo_set_mac_address = i40e_set_mac, |
| 1461 | .ndo_change_mtu = i40e_fcoe_change_mtu, |
| 1462 | .ndo_do_ioctl = i40e_ioctl, |
| 1463 | .ndo_tx_timeout = i40e_tx_timeout, |
| 1464 | .ndo_vlan_rx_add_vid = i40e_vlan_rx_add_vid, |
| 1465 | .ndo_vlan_rx_kill_vid = i40e_vlan_rx_kill_vid, |
| 1466 | .ndo_setup_tc = i40e_setup_tc, |
| 1467 | |
| 1468 | #ifdef CONFIG_NET_POLL_CONTROLLER |
| 1469 | .ndo_poll_controller = i40e_netpoll, |
| 1470 | #endif |
| 1471 | .ndo_start_xmit = i40e_fcoe_xmit_frame, |
| 1472 | .ndo_fcoe_enable = i40e_fcoe_enable, |
| 1473 | .ndo_fcoe_disable = i40e_fcoe_disable, |
| 1474 | .ndo_fcoe_ddp_setup = i40e_fcoe_ddp_get, |
| 1475 | .ndo_fcoe_ddp_done = i40e_fcoe_ddp_put, |
| 1476 | .ndo_fcoe_ddp_target = i40e_fcoe_ddp_target, |
| 1477 | .ndo_set_features = i40e_fcoe_set_features, |
| 1478 | }; |
| 1479 | |
| 1480 | /** |
| 1481 | * i40e_fcoe_config_netdev - prepares the VSI context for creating a FCoE VSI |
| 1482 | * @vsi: pointer to the associated VSI struct |
| 1483 | * @ctxt: pointer to the associated VSI context to be passed to HW |
| 1484 | * |
| 1485 | * Returns 0 on success or < 0 on error |
| 1486 | **/ |
| 1487 | void i40e_fcoe_config_netdev(struct net_device *netdev, struct i40e_vsi *vsi) |
| 1488 | { |
| 1489 | struct i40e_hw *hw = &vsi->back->hw; |
| 1490 | struct i40e_pf *pf = vsi->back; |
| 1491 | |
| 1492 | if (vsi->type != I40E_VSI_FCOE) |
| 1493 | return; |
| 1494 | |
| 1495 | netdev->features = (NETIF_F_HW_VLAN_CTAG_TX | |
| 1496 | NETIF_F_HW_VLAN_CTAG_RX | |
| 1497 | NETIF_F_HW_VLAN_CTAG_FILTER); |
| 1498 | |
| 1499 | netdev->vlan_features = netdev->features; |
| 1500 | netdev->vlan_features &= ~(NETIF_F_HW_VLAN_CTAG_TX | |
| 1501 | NETIF_F_HW_VLAN_CTAG_RX | |
| 1502 | NETIF_F_HW_VLAN_CTAG_FILTER); |
| 1503 | netdev->fcoe_ddp_xid = I40E_FCOE_DDP_MAX - 1; |
| 1504 | netdev->features |= NETIF_F_ALL_FCOE; |
| 1505 | netdev->vlan_features |= NETIF_F_ALL_FCOE; |
| 1506 | netdev->hw_features |= netdev->features; |
| 1507 | netdev->priv_flags |= IFF_UNICAST_FLT; |
| 1508 | netdev->priv_flags |= IFF_SUPP_NOFCS; |
| 1509 | |
| 1510 | strlcpy(netdev->name, "fcoe%d", IFNAMSIZ-1); |
| 1511 | netdev->mtu = FCOE_MTU; |
| 1512 | SET_NETDEV_DEV(netdev, &pf->pdev->dev); |
| 1513 | i40e_add_filter(vsi, hw->mac.san_addr, 0, false, false); |
| 1514 | i40e_add_filter(vsi, (u8[6]) FC_FCOE_FLOGI_MAC, 0, false, false); |
| 1515 | i40e_add_filter(vsi, FIP_ALL_FCOE_MACS, 0, false, false); |
| 1516 | i40e_add_filter(vsi, FIP_ALL_ENODE_MACS, 0, false, false); |
| 1517 | i40e_add_filter(vsi, FIP_ALL_VN2VN_MACS, 0, false, false); |
| 1518 | i40e_add_filter(vsi, FIP_ALL_P2P_MACS, 0, false, false); |
| 1519 | |
| 1520 | /* use san mac */ |
| 1521 | ether_addr_copy(netdev->dev_addr, hw->mac.san_addr); |
| 1522 | ether_addr_copy(netdev->perm_addr, hw->mac.san_addr); |
| 1523 | /* fcoe netdev ops */ |
| 1524 | netdev->netdev_ops = &i40e_fcoe_netdev_ops; |
| 1525 | } |
| 1526 | |
| 1527 | /** |
| 1528 | * i40e_fcoe_vsi_setup - allocate and set up FCoE VSI |
| 1529 | * @pf: the pf that VSI is associated with |
| 1530 | * |
| 1531 | **/ |
| 1532 | void i40e_fcoe_vsi_setup(struct i40e_pf *pf) |
| 1533 | { |
| 1534 | struct i40e_vsi *vsi; |
| 1535 | u16 seid; |
| 1536 | int i; |
| 1537 | |
| 1538 | if (!(pf->flags & I40E_FLAG_FCOE_ENABLED)) |
| 1539 | return; |
| 1540 | |
| 1541 | BUG_ON(!pf->vsi[pf->lan_vsi]); |
| 1542 | |
| 1543 | for (i = 0; i < pf->num_alloc_vsi; i++) { |
| 1544 | vsi = pf->vsi[i]; |
| 1545 | if (vsi && vsi->type == I40E_VSI_FCOE) { |
| 1546 | dev_warn(&pf->pdev->dev, |
| 1547 | "FCoE VSI already created\n"); |
| 1548 | return; |
| 1549 | } |
| 1550 | } |
| 1551 | |
| 1552 | seid = pf->vsi[pf->lan_vsi]->seid; |
| 1553 | vsi = i40e_vsi_setup(pf, I40E_VSI_FCOE, seid, 0); |
| 1554 | if (vsi) { |
| 1555 | dev_dbg(&pf->pdev->dev, |
| 1556 | "Successfully created FCoE VSI seid %d id %d uplink_seid %d pf seid %d\n", |
| 1557 | vsi->seid, vsi->id, vsi->uplink_seid, seid); |
| 1558 | } else { |
| 1559 | dev_info(&pf->pdev->dev, "Failed to create FCoE VSI\n"); |
| 1560 | } |
| 1561 | } |