LXR linux/drivers/net/ethernet/intel/i40e/i40e

   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#include "i40e_osdep.h"
  28#include "i40e_register.h"
  29#include "i40e_status.h"
  30#include "i40e_alloc.h"
  31#include "i40e_hmc.h"
  32#include "i40e_type.h"
  33
  34/**
  35 * i40e_add_sd_table_entry - Adds a segment descriptor to the table
  36 * @hw: pointer to our hw struct
  37 * @hmc_info: pointer to the HMC configuration information struct
  38 * @sd_index: segment descriptor index to manipulate
  39 * @type: what type of segment descriptor we're manipulating
  40 * @direct_mode_sz: size to alloc in direct mode
  41 **/
  42i40e_status i40e_add_sd_table_entry(struct i40e_hw *hw,
  43                                              struct i40e_hmc_info *hmc_info,
  44                                              u32 sd_index,
  45                                              enum i40e_sd_entry_type type,
  46                                              u64 direct_mode_sz)
  47{
  48        enum i40e_memory_type mem_type __attribute__((unused));
  49        struct i40e_hmc_sd_entry *sd_entry;
  50        bool dma_mem_alloc_done = false;
  51        struct i40e_dma_mem mem;
  52        i40e_status ret_code;
  53        u64 alloc_len;
  54
  55        if (NULL == hmc_info->sd_table.sd_entry) {
  56                ret_code = I40E_ERR_BAD_PTR;
  57                hw_dbg(hw, "i40e_add_sd_table_entry: bad sd_entry\n");
  58                goto exit;
  59        }
  60
  61        if (sd_index >= hmc_info->sd_table.sd_cnt) {
  62                ret_code = I40E_ERR_INVALID_SD_INDEX;
  63                hw_dbg(hw, "i40e_add_sd_table_entry: bad sd_index\n");
  64                goto exit;
  65        }
  66
  67        sd_entry = &hmc_info->sd_table.sd_entry[sd_index];
  68        if (!sd_entry->valid) {
  69                if (I40E_SD_TYPE_PAGED == type) {
  70                        mem_type = i40e_mem_pd;
  71                        alloc_len = I40E_HMC_PAGED_BP_SIZE;
  72                } else {
  73                        mem_type = i40e_mem_bp_jumbo;
  74                        alloc_len = direct_mode_sz;
  75                }
  76
  77                /* allocate a 4K pd page or 2M backing page */
  78                ret_code = i40e_allocate_dma_mem(hw, &mem, mem_type, alloc_len,
  79                                                 I40E_HMC_PD_BP_BUF_ALIGNMENT);
  80                if (ret_code)
  81                        goto exit;
  82                dma_mem_alloc_done = true;
  83                if (I40E_SD_TYPE_PAGED == type) {
  84                        ret_code = i40e_allocate_virt_mem(hw,
  85                                        &sd_entry->u.pd_table.pd_entry_virt_mem,
  86                                        sizeof(struct i40e_hmc_pd_entry) * 512);
  87                        if (ret_code)
  88                                goto exit;
  89                        sd_entry->u.pd_table.pd_entry =
  90                                (struct i40e_hmc_pd_entry *)
  91                                sd_entry->u.pd_table.pd_entry_virt_mem.va;
  92                        sd_entry->u.pd_table.pd_page_addr = mem;
  93                } else {
  94                        sd_entry->u.bp.addr = mem;
  95                        sd_entry->u.bp.sd_pd_index = sd_index;
  96                }
  97                /* initialize the sd entry */
  98                hmc_info->sd_table.sd_entry[sd_index].entry_type = type;
  99
 100                /* increment the ref count */
 101                I40E_INC_SD_REFCNT(&hmc_info->sd_table);
 102        }
 103        /* Increment backing page reference count */
 104        if (I40E_SD_TYPE_DIRECT == sd_entry->entry_type)
 105                I40E_INC_BP_REFCNT(&sd_entry->u.bp);
 106exit:
 107        if (ret_code)
 108                if (dma_mem_alloc_done)
 109                        i40e_free_dma_mem(hw, &mem);
 110
 111        return ret_code;
 112}
 113
 114/**
 115 * i40e_add_pd_table_entry - Adds page descriptor to the specified table
 116 * @hw: pointer to our HW structure
 117 * @hmc_info: pointer to the HMC configuration information structure
 118 * @pd_index: which page descriptor index to manipulate
 119 *
 120 * This function:
 121 *      1. Initializes the pd entry
 122 *      2. Adds pd_entry in the pd_table
 123 *      3. Mark the entry valid in i40e_hmc_pd_entry structure
 124 *      4. Initializes the pd_entry's ref count to 1
 125 * assumptions:
 126 *      1. The memory for pd should be pinned down, physically contiguous and
 127 *         aligned on 4K boundary and zeroed memory.
 128 *      2. It should be 4K in size.
 129 **/
 130i40e_status i40e_add_pd_table_entry(struct i40e_hw *hw,
 131                                              struct i40e_hmc_info *hmc_info,
 132                                              u32 pd_index)
 133{
 134        i40e_status ret_code = 0;
 135        struct i40e_hmc_pd_table *pd_table;
 136        struct i40e_hmc_pd_entry *pd_entry;
 137        struct i40e_dma_mem mem;
 138        u32 sd_idx, rel_pd_idx;
 139        u64 *pd_addr;
 140        u64 page_desc;
 141
 142        if (pd_index / I40E_HMC_PD_CNT_IN_SD >= hmc_info->sd_table.sd_cnt) {
 143                ret_code = I40E_ERR_INVALID_PAGE_DESC_INDEX;
 144                hw_dbg(hw, "i40e_add_pd_table_entry: bad pd_index\n");
 145                goto exit;
 146        }
 147
 148        /* find corresponding sd */
 149        sd_idx = (pd_index / I40E_HMC_PD_CNT_IN_SD);
 150        if (I40E_SD_TYPE_PAGED !=
 151            hmc_info->sd_table.sd_entry[sd_idx].entry_type)
 152                goto exit;
 153
 154        rel_pd_idx = (pd_index % I40E_HMC_PD_CNT_IN_SD);
 155        pd_table = &hmc_info->sd_table.sd_entry[sd_idx].u.pd_table;
 156        pd_entry = &pd_table->pd_entry[rel_pd_idx];
 157        if (!pd_entry->valid) {
 158                /* allocate a 4K backing page */
 159                ret_code = i40e_allocate_dma_mem(hw, &mem, i40e_mem_bp,
 160                                                 I40E_HMC_PAGED_BP_SIZE,
 161                                                 I40E_HMC_PD_BP_BUF_ALIGNMENT);
 162                if (ret_code)
 163                        goto exit;
 164
 165                pd_entry->bp.addr = mem;
 166                pd_entry->bp.sd_pd_index = pd_index;
 167                pd_entry->bp.entry_type = I40E_SD_TYPE_PAGED;
 168                /* Set page address and valid bit */
 169                page_desc = mem.pa | 0x1;
 170
 171                pd_addr = (u64 *)pd_table->pd_page_addr.va;
 172                pd_addr += rel_pd_idx;
 173
 174                /* Add the backing page physical address in the pd entry */
 175                memcpy(pd_addr, &page_desc, sizeof(u64));
 176
 177                pd_entry->sd_index = sd_idx;
 178                pd_entry->valid = true;
 179                I40E_INC_PD_REFCNT(pd_table);
 180        }
 181        I40E_INC_BP_REFCNT(&pd_entry->bp);
 182exit:
 183        return ret_code;
 184}
 185
 186/**
 187 * i40e_remove_pd_bp - remove a backing page from a page descriptor
 188 * @hw: pointer to our HW structure
 189 * @hmc_info: pointer to the HMC configuration information structure
 190 * @idx: the page index
 191 * @is_pf: distinguishes a VF from a PF
 192 *
 193 * This function:
 194 *      1. Marks the entry in pd tabe (for paged address mode) or in sd table
 195 *         (for direct address mode) invalid.
 196 *      2. Write to register PMPDINV to invalidate the backing page in FV cache
 197 *      3. Decrement the ref count for the pd _entry
 198 * assumptions:
 199 *      1. Caller can deallocate the memory used by backing storage after this
 200 *         function returns.
 201 **/
 202i40e_status i40e_remove_pd_bp(struct i40e_hw *hw,
 203                                        struct i40e_hmc_info *hmc_info,
 204                                        u32 idx)
 205{
 206        i40e_status ret_code = 0;
 207        struct i40e_hmc_pd_entry *pd_entry;
 208        struct i40e_hmc_pd_table *pd_table;
 209        struct i40e_hmc_sd_entry *sd_entry;
 210        u32 sd_idx, rel_pd_idx;
 211        u64 *pd_addr;
 212
 213        /* calculate index */
 214        sd_idx = idx / I40E_HMC_PD_CNT_IN_SD;
 215        rel_pd_idx = idx % I40E_HMC_PD_CNT_IN_SD;
 216        if (sd_idx >= hmc_info->sd_table.sd_cnt) {
 217                ret_code = I40E_ERR_INVALID_PAGE_DESC_INDEX;
 218                hw_dbg(hw, "i40e_remove_pd_bp: bad idx\n");
 219                goto exit;
 220        }
 221        sd_entry = &hmc_info->sd_table.sd_entry[sd_idx];
 222        if (I40E_SD_TYPE_PAGED != sd_entry->entry_type) {
 223                ret_code = I40E_ERR_INVALID_SD_TYPE;
 224                hw_dbg(hw, "i40e_remove_pd_bp: wrong sd_entry type\n");
 225                goto exit;
 226        }
 227        /* get the entry and decrease its ref counter */
 228        pd_table = &hmc_info->sd_table.sd_entry[sd_idx].u.pd_table;
 229        pd_entry = &pd_table->pd_entry[rel_pd_idx];
 230        I40E_DEC_BP_REFCNT(&pd_entry->bp);
 231        if (pd_entry->bp.ref_cnt)
 232                goto exit;
 233
 234        /* mark the entry invalid */
 235        pd_entry->valid = false;
 236        I40E_DEC_PD_REFCNT(pd_table);
 237        pd_addr = (u64 *)pd_table->pd_page_addr.va;
 238        pd_addr += rel_pd_idx;
 239        memset(pd_addr, 0, sizeof(u64));
 240        I40E_INVALIDATE_PF_HMC_PD(hw, sd_idx, idx);
 241
 242        /* free memory here */
 243        ret_code = i40e_free_dma_mem(hw, &(pd_entry->bp.addr));
 244        if (ret_code)
 245                goto exit;
 246        if (!pd_table->ref_cnt)
 247                i40e_free_virt_mem(hw, &pd_table->pd_entry_virt_mem);
 248exit:
 249        return ret_code;
 250}
 251
 252/**
 253 * i40e_prep_remove_sd_bp - Prepares to remove a backing page from a sd entry
 254 * @hmc_info: pointer to the HMC configuration information structure
 255 * @idx: the page index
 256 **/
 257i40e_status i40e_prep_remove_sd_bp(struct i40e_hmc_info *hmc_info,
 258                                             u32 idx)
 259{
 260        i40e_status ret_code = 0;
 261        struct i40e_hmc_sd_entry *sd_entry;
 262
 263        /* get the entry and decrease its ref counter */
 264        sd_entry = &hmc_info->sd_table.sd_entry[idx];
 265        I40E_DEC_BP_REFCNT(&sd_entry->u.bp);
 266        if (sd_entry->u.bp.ref_cnt) {
 267                ret_code = I40E_ERR_NOT_READY;
 268                goto exit;
 269        }
 270        I40E_DEC_SD_REFCNT(&hmc_info->sd_table);
 271
 272        /* mark the entry invalid */
 273        sd_entry->valid = false;
 274exit:
 275        return ret_code;
 276}
 277
 278/**
 279 * i40e_remove_sd_bp_new - Removes a backing page from a segment descriptor
 280 * @hw: pointer to our hw struct
 281 * @hmc_info: pointer to the HMC configuration information structure
 282 * @idx: the page index
 283 * @is_pf: used to distinguish between VF and PF
 284 **/
 285i40e_status i40e_remove_sd_bp_new(struct i40e_hw *hw,
 286                                            struct i40e_hmc_info *hmc_info,
 287                                            u32 idx, bool is_pf)
 288{
 289        struct i40e_hmc_sd_entry *sd_entry;
 290        i40e_status ret_code = 0;
 291
 292        /* get the entry and decrease its ref counter */
 293        sd_entry = &hmc_info->sd_table.sd_entry[idx];
 294        if (is_pf) {
 295                I40E_CLEAR_PF_SD_ENTRY(hw, idx, I40E_SD_TYPE_DIRECT);
 296        } else {
 297                ret_code = I40E_NOT_SUPPORTED;
 298                goto exit;
 299        }
 300        ret_code = i40e_free_dma_mem(hw, &(sd_entry->u.bp.addr));
 301        if (ret_code)
 302                goto exit;
 303exit:
 304        return ret_code;
 305}
 306
 307/**
 308 * i40e_prep_remove_pd_page - Prepares to remove a PD page from sd entry.
 309 * @hmc_info: pointer to the HMC configuration information structure
 310 * @idx: segment descriptor index to find the relevant page descriptor
 311 **/
 312i40e_status i40e_prep_remove_pd_page(struct i40e_hmc_info *hmc_info,
 313                                               u32 idx)
 314{
 315        i40e_status ret_code = 0;
 316        struct i40e_hmc_sd_entry *sd_entry;
 317
 318        sd_entry = &hmc_info->sd_table.sd_entry[idx];
 319
 320        if (sd_entry->u.pd_table.ref_cnt) {
 321                ret_code = I40E_ERR_NOT_READY;
 322                goto exit;
 323        }
 324
 325        /* mark the entry invalid */
 326        sd_entry->valid = false;
 327
 328        I40E_DEC_SD_REFCNT(&hmc_info->sd_table);
 329exit:
 330        return ret_code;
 331}
 332
 333/**
 334 * i40e_remove_pd_page_new - Removes a PD page from sd entry.
 335 * @hw: pointer to our hw struct
 336 * @hmc_info: pointer to the HMC configuration information structure
 337 * @idx: segment descriptor index to find the relevant page descriptor
 338 * @is_pf: used to distinguish between VF and PF
 339 **/
 340i40e_status i40e_remove_pd_page_new(struct i40e_hw *hw,
 341                                              struct i40e_hmc_info *hmc_info,
 342                                              u32 idx, bool is_pf)
 343{
 344        i40e_status ret_code = 0;
 345        struct i40e_hmc_sd_entry *sd_entry;
 346
 347        sd_entry = &hmc_info->sd_table.sd_entry[idx];
 348        if (is_pf) {
 349                I40E_CLEAR_PF_SD_ENTRY(hw, idx, I40E_SD_TYPE_PAGED);
 350        } else {
 351                ret_code = I40E_NOT_SUPPORTED;
 352                goto exit;
 353        }
 354        /* free memory here */
 355        ret_code = i40e_free_dma_mem(hw, &(sd_entry->u.pd_table.pd_page_addr));
 356        if (ret_code)
 357                goto exit;
 358exit:
 359        return ret_code;
 360}
 361