drivers/net/ethernet/intel/e1000e/manage.c

   1 /* Intel PRO/1000 Linux driver
   2  * Copyright(c) 1999 - 2015 Intel Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or modify it
   5  * under the terms and conditions of the GNU General Public License,
   6  * version 2, as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope it will be useful, but WITHOUT
   9  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  10  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  11  * more details.
  12  *
  13  * The full GNU General Public License is included in this distribution in
  14  * the file called "COPYING".
  15  *
  16  * Contact Information:
  17  * Linux NICS <linux.nics@intel.com>
  18  * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
  19  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  20  */
  21
  22 #include "e1000.h"
  23
  24 /**
  25  *  e1000_calculate_checksum - Calculate checksum for buffer
  26  *  @buffer: pointer to EEPROM
  27  *  @length: size of EEPROM to calculate a checksum for
  28  *
  29  *  Calculates the checksum for some buffer on a specified length.  The
  30  *  checksum calculated is returned.
  31  **/
  32 static u8 e1000_calculate_checksum(u8 *buffer, u32 length)
  33 {
  34         u32 i;
  35         u8 sum = 0;
  36
  37         if (!buffer)
  38                 return 0;
  39
  40         for (i = 0; i < length; i++)
  41                 sum += buffer[i];
  42
  43         return (u8)(0 - sum);
  44 }
  45
  46 /**
  47  *  e1000_mng_enable_host_if - Checks host interface is enabled
  48  *  @hw: pointer to the HW structure
  49  *
  50  *  Returns 0 upon success, else -E1000_ERR_HOST_INTERFACE_COMMAND
  51  *
  52  *  This function checks whether the HOST IF is enabled for command operation
  53  *  and also checks whether the previous command is completed.  It busy waits
  54  *  in case of previous command is not completed.
  55  **/
  56 static s32 e1000_mng_enable_host_if(struct e1000_hw *hw)
  57 {
  58         u32 hicr;
  59         u8 i;
  60
  61         if (!hw->mac.arc_subsystem_valid) {
  62                 e_dbg("ARC subsystem not valid.\n");
  63                 return -E1000_ERR_HOST_INTERFACE_COMMAND;
  64         }
  65
  66         /* Check that the host interface is enabled. */
  67         hicr = er32(HICR);
  68         if (!(hicr & E1000_HICR_EN)) {
  69                 e_dbg("E1000_HOST_EN bit disabled.\n");
  70                 return -E1000_ERR_HOST_INTERFACE_COMMAND;
  71         }
  72         /* check the previous command is completed */
  73         for (i = 0; i < E1000_MNG_DHCP_COMMAND_TIMEOUT; i++) {
  74                 hicr = er32(HICR);
  75                 if (!(hicr & E1000_HICR_C))
  76                         break;
  77                 mdelay(1);
  78         }
  79
  80         if (i == E1000_MNG_DHCP_COMMAND_TIMEOUT) {
  81                 e_dbg("Previous command timeout failed.\n");
  82                 return -E1000_ERR_HOST_INTERFACE_COMMAND;
  83         }
  84
  85         return 0;
  86 }
  87
  88 /**
  89  *  e1000e_check_mng_mode_generic - Generic check management mode
  90  *  @hw: pointer to the HW structure
  91  *
  92  *  Reads the firmware semaphore register and returns true (>0) if
  93  *  manageability is enabled, else false (0).
  94  **/
  95 bool e1000e_check_mng_mode_generic(struct e1000_hw *hw)
  96 {
  97         u32 fwsm = er32(FWSM);
  98
  99         return (fwsm & E1000_FWSM_MODE_MASK) ==
 100             (E1000_MNG_IAMT_MODE << E1000_FWSM_MODE_SHIFT);
 101 }
 102
 103 /**
 104  *  e1000e_enable_tx_pkt_filtering - Enable packet filtering on Tx
 105  *  @hw: pointer to the HW structure
 106  *
 107  *  Enables packet filtering on transmit packets if manageability is enabled
 108  *  and host interface is enabled.
 109  **/
 110 bool e1000e_enable_tx_pkt_filtering(struct e1000_hw *hw)
 111 {
 112         struct e1000_host_mng_dhcp_cookie *hdr = &hw->mng_cookie;
 113         u32 *buffer = (u32 *)&hw->mng_cookie;
 114         u32 offset;
 115         s32 ret_val, hdr_csum, csum;
 116         u8 i, len;
 117
 118         hw->mac.tx_pkt_filtering = true;
 119
 120         /* No manageability, no filtering */
 121         if (!hw->mac.ops.check_mng_mode(hw)) {
 122                 hw->mac.tx_pkt_filtering = false;
 123                 return hw->mac.tx_pkt_filtering;
 124         }
 125
 126         /* If we can't read from the host interface for whatever
 127          * reason, disable filtering.
 128          */
 129         ret_val = e1000_mng_enable_host_if(hw);
 130         if (ret_val) {
 131                 hw->mac.tx_pkt_filtering = false;
 132                 return hw->mac.tx_pkt_filtering;
 133         }
 134
 135         /* Read in the header.  Length and offset are in dwords. */
 136         len = E1000_MNG_DHCP_COOKIE_LENGTH >> 2;
 137         offset = E1000_MNG_DHCP_COOKIE_OFFSET >> 2;
 138         for (i = 0; i < len; i++)
 139                 *(buffer + i) = E1000_READ_REG_ARRAY(hw, E1000_HOST_IF,
 140                                                      offset + i);
 141         hdr_csum = hdr->checksum;
 142         hdr->checksum = 0;
 143         csum = e1000_calculate_checksum((u8 *)hdr,
 144                                         E1000_MNG_DHCP_COOKIE_LENGTH);
 145         /* If either the checksums or signature don't match, then
 146          * the cookie area isn't considered valid, in which case we
 147          * take the safe route of assuming Tx filtering is enabled.
 148          */
 149         if ((hdr_csum != csum) || (hdr->signature != E1000_IAMT_SIGNATURE)) {
 150                 hw->mac.tx_pkt_filtering = true;
 151                 return hw->mac.tx_pkt_filtering;
 152         }
 153
 154         /* Cookie area is valid, make the final check for filtering. */
 155         if (!(hdr->status & E1000_MNG_DHCP_COOKIE_STATUS_PARSING))
 156                 hw->mac.tx_pkt_filtering = false;
 157
 158         return hw->mac.tx_pkt_filtering;
 159 }
 160
 161 /**
 162  *  e1000_mng_write_cmd_header - Writes manageability command header
 163  *  @hw: pointer to the HW structure
 164  *  @hdr: pointer to the host interface command header
 165  *
 166  *  Writes the command header after does the checksum calculation.
 167  **/
 168 static s32 e1000_mng_write_cmd_header(struct e1000_hw *hw,
 169                                       struct e1000_host_mng_command_header *hdr)
 170 {
 171         u16 i, length = sizeof(struct e1000_host_mng_command_header);
 172
 173         /* Write the whole command header structure with new checksum. */
 174
 175         hdr->checksum = e1000_calculate_checksum((u8 *)hdr, length);
 176
 177         length >>= 2;
 178         /* Write the relevant command block into the ram area. */
 179         for (i = 0; i < length; i++) {
 180                 E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, i, *((u32 *)hdr + i));
 181                 e1e_flush();
 182         }
 183
 184         return 0;
 185 }
 186
 187 /**
 188  *  e1000_mng_host_if_write - Write to the manageability host interface
 189  *  @hw: pointer to the HW structure
 190  *  @buffer: pointer to the host interface buffer
 191  *  @length: size of the buffer
 192  *  @offset: location in the buffer to write to
 193  *  @sum: sum of the data (not checksum)
 194  *
 195  *  This function writes the buffer content at the offset given on the host if.
 196  *  It also does alignment considerations to do the writes in most efficient
 197  *  way.  Also fills up the sum of the buffer in *buffer parameter.
 198  **/
 199 static s32 e1000_mng_host_if_write(struct e1000_hw *hw, u8 *buffer,
 200                                    u16 length, u16 offset, u8 *sum)
 201 {
 202         u8 *tmp;
 203         u8 *bufptr = buffer;
 204         u32 data = 0;
 205         u16 remaining, i, j, prev_bytes;
 206
 207         /* sum = only sum of the data and it is not checksum */
 208
 209         if (length == 0 || offset + length > E1000_HI_MAX_MNG_DATA_LENGTH)
 210                 return -E1000_ERR_PARAM;
 211
 212         tmp = (u8 *)&data;
 213         prev_bytes = offset & 0x3;
 214         offset >>= 2;
 215
 216         if (prev_bytes) {
 217                 data = E1000_READ_REG_ARRAY(hw, E1000_HOST_IF, offset);
 218                 for (j = prev_bytes; j < sizeof(u32); j++) {
 219                         *(tmp + j) = *bufptr++;
 220                         *sum += *(tmp + j);
 221                 }
 222                 E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset, data);
 223                 length -= j - prev_bytes;
 224                 offset++;
 225         }
 226
 227         remaining = length & 0x3;
 228         length -= remaining;
 229
 230         /* Calculate length in DWORDs */
 231         length >>= 2;
 232
 233         /* The device driver writes the relevant command block into the
 234          * ram area.
 235          */
 236         for (i = 0; i < length; i++) {
 237                 for (j = 0; j < sizeof(u32); j++) {
 238                         *(tmp + j) = *bufptr++;
 239                         *sum += *(tmp + j);
 240                 }
 241
 242                 E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset + i, data);
 243         }
 244         if (remaining) {
 245                 for (j = 0; j < sizeof(u32); j++) {
 246                         if (j < remaining)
 247                                 *(tmp + j) = *bufptr++;
 248                         else
 249                                 *(tmp + j) = 0;
 250
 251                         *sum += *(tmp + j);
 252                 }
 253                 E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset + i, data);
 254         }
 255
 256         return 0;
 257 }
 258
 259 /**
 260  *  e1000e_mng_write_dhcp_info - Writes DHCP info to host interface
 261  *  @hw: pointer to the HW structure
 262  *  @buffer: pointer to the host interface
 263  *  @length: size of the buffer
 264  *
 265  *  Writes the DHCP information to the host interface.
 266  **/
 267 s32 e1000e_mng_write_dhcp_info(struct e1000_hw *hw, u8 *buffer, u16 length)
 268 {
 269         struct e1000_host_mng_command_header hdr;
 270         s32 ret_val;
 271         u32 hicr;
 272
 273         hdr.command_id = E1000_MNG_DHCP_TX_PAYLOAD_CMD;
 274         hdr.command_length = length;
 275         hdr.reserved1 = 0;
 276         hdr.reserved2 = 0;
 277         hdr.checksum = 0;
 278
 279         /* Enable the host interface */
 280         ret_val = e1000_mng_enable_host_if(hw);
 281         if (ret_val)
 282                 return ret_val;
 283
 284         /* Populate the host interface with the contents of "buffer". */
 285         ret_val = e1000_mng_host_if_write(hw, buffer, length,
 286                                           sizeof(hdr), &(hdr.checksum));
 287         if (ret_val)
 288                 return ret_val;
 289
 290         /* Write the manageability command header */
 291         ret_val = e1000_mng_write_cmd_header(hw, &hdr);
 292         if (ret_val)
 293                 return ret_val;
 294
 295         /* Tell the ARC a new command is pending. */
 296         hicr = er32(HICR);
 297         ew32(HICR, hicr | E1000_HICR_C);
 298
 299         return 0;
 300 }
 301
 302 /**
 303  *  e1000e_enable_mng_pass_thru - Check if management passthrough is needed
 304  *  @hw: pointer to the HW structure
 305  *
 306  *  Verifies the hardware needs to leave interface enabled so that frames can
 307  *  be directed to and from the management interface.
 308  **/
 309 bool e1000e_enable_mng_pass_thru(struct e1000_hw *hw)
 310 {
 311         u32 manc;
 312         u32 fwsm, factps;
 313
 314         manc = er32(MANC);
 315
 316         if (!(manc & E1000_MANC_RCV_TCO_EN))
 317                 return false;
 318
 319         if (hw->mac.has_fwsm) {
 320                 fwsm = er32(FWSM);
 321                 factps = er32(FACTPS);
 322
 323                 if (!(factps & E1000_FACTPS_MNGCG) &&
 324                     ((fwsm & E1000_FWSM_MODE_MASK) ==
 325                      (e1000_mng_mode_pt << E1000_FWSM_MODE_SHIFT)))
 326                         return true;
 327         } else if ((hw->mac.type == e1000_82574) ||
 328                    (hw->mac.type == e1000_82583)) {
 329                 u16 data;
 330                 s32 ret_val;
 331
 332                 factps = er32(FACTPS);
 333                 ret_val = e1000_read_nvm(hw, NVM_INIT_CONTROL2_REG, 1, &data);
 334                 if (ret_val)
 335                         return false;
 336
 337                 if (!(factps & E1000_FACTPS_MNGCG) &&
 338                     ((data & E1000_NVM_INIT_CTRL2_MNGM) ==
 339                      (e1000_mng_mode_pt << 13)))
 340                         return true;
 341         } else if ((manc & E1000_MANC_SMBUS_EN) &&
 342                    !(manc & E1000_MANC_ASF_EN)) {
 343                 return true;
 344         }
 345
 346         return false;
 347 }