drivers/net/ethernet/intel/igbvf/vf.c

   1 /*******************************************************************************
   2
   3   Intel(R) 82576 Virtual Function Linux driver
   4   Copyright(c) 2009 - 2012 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 with
  16   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 "vf.h"
  28
  29 static s32 e1000_check_for_link_vf(struct e1000_hw *hw);
  30 static s32 e1000_get_link_up_info_vf(struct e1000_hw *hw, u16 *speed,
  31                                      u16 *duplex);
  32 static s32 e1000_init_hw_vf(struct e1000_hw *hw);
  33 static s32 e1000_reset_hw_vf(struct e1000_hw *hw);
  34
  35 static void e1000_update_mc_addr_list_vf(struct e1000_hw *hw, u8 *,
  36                                          u32, u32, u32);
  37 static void e1000_rar_set_vf(struct e1000_hw *, u8 *, u32);
  38 static s32 e1000_read_mac_addr_vf(struct e1000_hw *);
  39 static s32 e1000_set_vfta_vf(struct e1000_hw *, u16, bool);
  40
  41 /**
  42  *  e1000_init_mac_params_vf - Inits MAC params
  43  *  @hw: pointer to the HW structure
  44  **/
  45 static s32 e1000_init_mac_params_vf(struct e1000_hw *hw)
  46 {
  47         struct e1000_mac_info *mac = &hw->mac;
  48
  49         /* VF's have no MTA Registers - PF feature only */
  50         mac->mta_reg_count = 128;
  51         /* VF's have no access to RAR entries  */
  52         mac->rar_entry_count = 1;
  53
  54         /* Function pointers */
  55         /* reset */
  56         mac->ops.reset_hw = e1000_reset_hw_vf;
  57         /* hw initialization */
  58         mac->ops.init_hw = e1000_init_hw_vf;
  59         /* check for link */
  60         mac->ops.check_for_link = e1000_check_for_link_vf;
  61         /* link info */
  62         mac->ops.get_link_up_info = e1000_get_link_up_info_vf;
  63         /* multicast address update */
  64         mac->ops.update_mc_addr_list = e1000_update_mc_addr_list_vf;
  65         /* set mac address */
  66         mac->ops.rar_set = e1000_rar_set_vf;
  67         /* read mac address */
  68         mac->ops.read_mac_addr = e1000_read_mac_addr_vf;
  69         /* set vlan filter table array */
  70         mac->ops.set_vfta = e1000_set_vfta_vf;
  71
  72         return E1000_SUCCESS;
  73 }
  74
  75 /**
  76  *  e1000_init_function_pointers_vf - Inits function pointers
  77  *  @hw: pointer to the HW structure
  78  **/
  79 void e1000_init_function_pointers_vf(struct e1000_hw *hw)
  80 {
  81         hw->mac.ops.init_params = e1000_init_mac_params_vf;
  82         hw->mbx.ops.init_params = e1000_init_mbx_params_vf;
  83 }
  84
  85 /**
  86  *  e1000_get_link_up_info_vf - Gets link info.
  87  *  @hw: pointer to the HW structure
  88  *  @speed: pointer to 16 bit value to store link speed.
  89  *  @duplex: pointer to 16 bit value to store duplex.
  90  *
  91  *  Since we cannot read the PHY and get accurate link info, we must rely upon
  92  *  the status register's data which is often stale and inaccurate.
  93  **/
  94 static s32 e1000_get_link_up_info_vf(struct e1000_hw *hw, u16 *speed,
  95                                      u16 *duplex)
  96 {
  97         s32 status;
  98
  99         status = er32(STATUS);
 100         if (status & E1000_STATUS_SPEED_1000)
 101                 *speed = SPEED_1000;
 102         else if (status & E1000_STATUS_SPEED_100)
 103                 *speed = SPEED_100;
 104         else
 105                 *speed = SPEED_10;
 106
 107         if (status & E1000_STATUS_FD)
 108                 *duplex = FULL_DUPLEX;
 109         else
 110                 *duplex = HALF_DUPLEX;
 111
 112         return E1000_SUCCESS;
 113 }
 114
 115 /**
 116  *  e1000_reset_hw_vf - Resets the HW
 117  *  @hw: pointer to the HW structure
 118  *
 119  *  VF's provide a function level reset. This is done using bit 26 of ctrl_reg.
 120  *  This is all the reset we can perform on a VF.
 121  **/
 122 static s32 e1000_reset_hw_vf(struct e1000_hw *hw)
 123 {
 124         struct e1000_mbx_info *mbx = &hw->mbx;
 125         u32 timeout = E1000_VF_INIT_TIMEOUT;
 126         u32 ret_val = -E1000_ERR_MAC_INIT;
 127         u32 msgbuf[3];
 128         u8 *addr = (u8 *)(&msgbuf[1]);
 129         u32 ctrl;
 130
 131         /* assert VF queue/interrupt reset */
 132         ctrl = er32(CTRL);
 133         ew32(CTRL, ctrl | E1000_CTRL_RST);
 134
 135         /* we cannot initialize while the RSTI / RSTD bits are asserted */
 136         while (!mbx->ops.check_for_rst(hw) && timeout) {
 137                 timeout--;
 138                 udelay(5);
 139         }
 140
 141         if (timeout) {
 142                 /* mailbox timeout can now become active */
 143                 mbx->timeout = E1000_VF_MBX_INIT_TIMEOUT;
 144
 145                 /* notify PF of VF reset completion */
 146                 msgbuf[0] = E1000_VF_RESET;
 147                 mbx->ops.write_posted(hw, msgbuf, 1);
 148
 149                 msleep(10);
 150
 151                 /* set our "perm_addr" based on info provided by PF */
 152                 ret_val = mbx->ops.read_posted(hw, msgbuf, 3);
 153                 if (!ret_val) {
 154                         if (msgbuf[0] == (E1000_VF_RESET |
 155                                           E1000_VT_MSGTYPE_ACK))
 156                                 memcpy(hw->mac.perm_addr, addr, ETH_ALEN);
 157                         else
 158                                 ret_val = -E1000_ERR_MAC_INIT;
 159                 }
 160         }
 161
 162         return ret_val;
 163 }
 164
 165 /**
 166  *  e1000_init_hw_vf - Inits the HW
 167  *  @hw: pointer to the HW structure
 168  *
 169  *  Not much to do here except clear the PF Reset indication if there is one.
 170  **/
 171 static s32 e1000_init_hw_vf(struct e1000_hw *hw)
 172 {
 173         /* attempt to set and restore our mac address */
 174         e1000_rar_set_vf(hw, hw->mac.addr, 0);
 175
 176         return E1000_SUCCESS;
 177 }
 178
 179 /**
 180  *  e1000_hash_mc_addr_vf - Generate a multicast hash value
 181  *  @hw: pointer to the HW structure
 182  *  @mc_addr: pointer to a multicast address
 183  *
 184  *  Generates a multicast address hash value which is used to determine
 185  *  the multicast filter table array address and new table value.  See
 186  *  e1000_mta_set_generic()
 187  **/
 188 static u32 e1000_hash_mc_addr_vf(struct e1000_hw *hw, u8 *mc_addr)
 189 {
 190         u32 hash_value, hash_mask;
 191         u8 bit_shift = 0;
 192
 193         /* Register count multiplied by bits per register */
 194         hash_mask = (hw->mac.mta_reg_count * 32) - 1;
 195
 196         /* The bit_shift is the number of left-shifts
 197          * where 0xFF would still fall within the hash mask.
 198          */
 199         while (hash_mask >> bit_shift != 0xFF)
 200                 bit_shift++;
 201
 202         hash_value = hash_mask & (((mc_addr[4] >> (8 - bit_shift)) |
 203                                   (((u16)mc_addr[5]) << bit_shift)));
 204
 205         return hash_value;
 206 }
 207
 208 /**
 209  *  e1000_update_mc_addr_list_vf - Update Multicast addresses
 210  *  @hw: pointer to the HW structure
 211  *  @mc_addr_list: array of multicast addresses to program
 212  *  @mc_addr_count: number of multicast addresses to program
 213  *  @rar_used_count: the first RAR register free to program
 214  *  @rar_count: total number of supported Receive Address Registers
 215  *
 216  *  Updates the Receive Address Registers and Multicast Table Array.
 217  *  The caller must have a packed mc_addr_list of multicast addresses.
 218  *  The parameter rar_count will usually be hw->mac.rar_entry_count
 219  *  unless there are workarounds that change this.
 220  **/
 221 static void e1000_update_mc_addr_list_vf(struct e1000_hw *hw,
 222                                          u8 *mc_addr_list, u32 mc_addr_count,
 223                                          u32 rar_used_count, u32 rar_count)
 224 {
 225         struct e1000_mbx_info *mbx = &hw->mbx;
 226         u32 msgbuf[E1000_VFMAILBOX_SIZE];
 227         u16 *hash_list = (u16 *)&msgbuf[1];
 228         u32 hash_value;
 229         u32 cnt, i;
 230
 231         /* Each entry in the list uses 1 16 bit word.  We have 30
 232          * 16 bit words available in our HW msg buffer (minus 1 for the
 233          * msg type).  That's 30 hash values if we pack 'em right.  If
 234          * there are more than 30 MC addresses to add then punt the
 235          * extras for now and then add code to handle more than 30 later.
 236          * It would be unusual for a server to request that many multi-cast
 237          * addresses except for in large enterprise network environments.
 238          */
 239
 240         cnt = (mc_addr_count > 30) ? 30 : mc_addr_count;
 241         msgbuf[0] = E1000_VF_SET_MULTICAST;
 242         msgbuf[0] |= cnt << E1000_VT_MSGINFO_SHIFT;
 243
 244         for (i = 0; i < cnt; i++) {
 245                 hash_value = e1000_hash_mc_addr_vf(hw, mc_addr_list);
 246                 hash_list[i] = hash_value & 0x0FFFF;
 247                 mc_addr_list += ETH_ALEN;
 248         }
 249
 250         mbx->ops.write_posted(hw, msgbuf, E1000_VFMAILBOX_SIZE);
 251 }
 252
 253 /**
 254  *  e1000_set_vfta_vf - Set/Unset vlan filter table address
 255  *  @hw: pointer to the HW structure
 256  *  @vid: determines the vfta register and bit to set/unset
 257  *  @set: if true then set bit, else clear bit
 258  **/
 259 static s32 e1000_set_vfta_vf(struct e1000_hw *hw, u16 vid, bool set)
 260 {
 261         struct e1000_mbx_info *mbx = &hw->mbx;
 262         u32 msgbuf[2];
 263         s32 err;
 264
 265         msgbuf[0] = E1000_VF_SET_VLAN;
 266         msgbuf[1] = vid;
 267         /* Setting the 8 bit field MSG INFO to true indicates "add" */
 268         if (set)
 269                 msgbuf[0] |= 1 << E1000_VT_MSGINFO_SHIFT;
 270
 271         mbx->ops.write_posted(hw, msgbuf, 2);
 272
 273         err = mbx->ops.read_posted(hw, msgbuf, 2);
 274
 275         msgbuf[0] &= ~E1000_VT_MSGTYPE_CTS;
 276
 277         /* if nacked the vlan was rejected */
 278         if (!err && (msgbuf[0] == (E1000_VF_SET_VLAN | E1000_VT_MSGTYPE_NACK)))
 279                 err = -E1000_ERR_MAC_INIT;
 280
 281         return err;
 282 }
 283
 284 /**
 285  *  e1000_rlpml_set_vf - Set the maximum receive packet length
 286  *  @hw: pointer to the HW structure
 287  *  @max_size: value to assign to max frame size
 288  **/
 289 void e1000_rlpml_set_vf(struct e1000_hw *hw, u16 max_size)
 290 {
 291         struct e1000_mbx_info *mbx = &hw->mbx;
 292         u32 msgbuf[2];
 293
 294         msgbuf[0] = E1000_VF_SET_LPE;
 295         msgbuf[1] = max_size;
 296
 297         mbx->ops.write_posted(hw, msgbuf, 2);
 298 }
 299
 300 /**
 301  *  e1000_rar_set_vf - set device MAC address
 302  *  @hw: pointer to the HW structure
 303  *  @addr: pointer to the receive address
 304  *  @index: receive address array register
 305  **/
 306 static void e1000_rar_set_vf(struct e1000_hw *hw, u8 *addr, u32 index)
 307 {
 308         struct e1000_mbx_info *mbx = &hw->mbx;
 309         u32 msgbuf[3];
 310         u8 *msg_addr = (u8 *)(&msgbuf[1]);
 311         s32 ret_val;
 312
 313         memset(msgbuf, 0, 12);
 314         msgbuf[0] = E1000_VF_SET_MAC_ADDR;
 315         memcpy(msg_addr, addr, ETH_ALEN);
 316         ret_val = mbx->ops.write_posted(hw, msgbuf, 3);
 317
 318         if (!ret_val)
 319                 ret_val = mbx->ops.read_posted(hw, msgbuf, 3);
 320
 321         msgbuf[0] &= ~E1000_VT_MSGTYPE_CTS;
 322
 323         /* if nacked the address was rejected, use "perm_addr" */
 324         if (!ret_val &&
 325             (msgbuf[0] == (E1000_VF_SET_MAC_ADDR | E1000_VT_MSGTYPE_NACK)))
 326                 e1000_read_mac_addr_vf(hw);
 327 }
 328
 329 /**
 330  *  e1000_read_mac_addr_vf - Read device MAC address
 331  *  @hw: pointer to the HW structure
 332  **/
 333 static s32 e1000_read_mac_addr_vf(struct e1000_hw *hw)
 334 {
 335         memcpy(hw->mac.addr, hw->mac.perm_addr, ETH_ALEN);
 336
 337         return E1000_SUCCESS;
 338 }
 339
 340 /**
 341  *  e1000_check_for_link_vf - Check for link for a virtual interface
 342  *  @hw: pointer to the HW structure
 343  *
 344  *  Checks to see if the underlying PF is still talking to the VF and
 345  *  if it is then it reports the link state to the hardware, otherwise
 346  *  it reports link down and returns an error.
 347  **/
 348 static s32 e1000_check_for_link_vf(struct e1000_hw *hw)
 349 {
 350         struct e1000_mbx_info *mbx = &hw->mbx;
 351         struct e1000_mac_info *mac = &hw->mac;
 352         s32 ret_val = E1000_SUCCESS;
 353         u32 in_msg = 0;
 354
 355         /* We only want to run this if there has been a rst asserted.
 356          * in this case that could mean a link change, device reset,
 357          * or a virtual function reset
 358          */
 359
 360         /* If we were hit with a reset or timeout drop the link */
 361         if (!mbx->ops.check_for_rst(hw) || !mbx->timeout)
 362                 mac->get_link_status = true;
 363
 364         if (!mac->get_link_status)
 365                 goto out;
 366
 367         /* if link status is down no point in checking to see if PF is up */
 368         if (!(er32(STATUS) & E1000_STATUS_LU))
 369                 goto out;
 370
 371         /* if the read failed it could just be a mailbox collision, best wait
 372          * until we are called again and don't report an error
 373          */
 374         if (mbx->ops.read(hw, &in_msg, 1))
 375                 goto out;
 376
 377         /* if incoming message isn't clear to send we are waiting on response */
 378         if (!(in_msg & E1000_VT_MSGTYPE_CTS)) {
 379                 /* msg is not CTS and is NACK we must have lost CTS status */
 380                 if (in_msg & E1000_VT_MSGTYPE_NACK)
 381                         ret_val = -E1000_ERR_MAC_INIT;
 382                 goto out;
 383         }
 384
 385         /* the PF is talking, if we timed out in the past we reinit */
 386         if (!mbx->timeout) {
 387                 ret_val = -E1000_ERR_MAC_INIT;
 388                 goto out;
 389         }
 390
 391         /* if we passed all the tests above then the link is up and we no
 392          * longer need to check for link
 393          */
 394         mac->get_link_status = false;
 395
 396 out:
 397         return ret_val;
 398 }
 399