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

   1 // SPDX-License-Identifier: GPL-2.0
   2 /* Copyright(c) 2009 - 2018 Intel Corporation. */
   3
   4 #include "vf.h"
   5
   6 static s32 e1000_check_for_link_vf(struct e1000_hw *hw);
   7 static s32 e1000_get_link_up_info_vf(struct e1000_hw *hw, u16 *speed,
   8                                      u16 *duplex);
   9 static s32 e1000_init_hw_vf(struct e1000_hw *hw);
  10 static s32 e1000_reset_hw_vf(struct e1000_hw *hw);
  11
  12 static void e1000_update_mc_addr_list_vf(struct e1000_hw *hw, u8 *,
  13                                          u32, u32, u32);
  14 static void e1000_rar_set_vf(struct e1000_hw *, u8 *, u32);
  15 static s32 e1000_read_mac_addr_vf(struct e1000_hw *);
  16 static s32 e1000_set_uc_addr_vf(struct e1000_hw *hw, u32 subcmd, u8 *addr);
  17 static s32 e1000_set_vfta_vf(struct e1000_hw *, u16, bool);
  18
  19 /**
  20  *  e1000_init_mac_params_vf - Inits MAC params
  21  *  @hw: pointer to the HW structure
  22  **/
  23 static s32 e1000_init_mac_params_vf(struct e1000_hw *hw)
  24 {
  25         struct e1000_mac_info *mac = &hw->mac;
  26
  27         /* VF's have no MTA Registers - PF feature only */
  28         mac->mta_reg_count = 128;
  29         /* VF's have no access to RAR entries  */
  30         mac->rar_entry_count = 1;
  31
  32         /* Function pointers */
  33         /* reset */
  34         mac->ops.reset_hw = e1000_reset_hw_vf;
  35         /* hw initialization */
  36         mac->ops.init_hw = e1000_init_hw_vf;
  37         /* check for link */
  38         mac->ops.check_for_link = e1000_check_for_link_vf;
  39         /* link info */
  40         mac->ops.get_link_up_info = e1000_get_link_up_info_vf;
  41         /* multicast address update */
  42         mac->ops.update_mc_addr_list = e1000_update_mc_addr_list_vf;
  43         /* set mac address */
  44         mac->ops.rar_set = e1000_rar_set_vf;
  45         /* read mac address */
  46         mac->ops.read_mac_addr = e1000_read_mac_addr_vf;
  47         /* set mac filter */
  48         mac->ops.set_uc_addr = e1000_set_uc_addr_vf;
  49         /* set vlan filter table array */
  50         mac->ops.set_vfta = e1000_set_vfta_vf;
  51
  52         return E1000_SUCCESS;
  53 }
  54
  55 /**
  56  *  e1000_init_function_pointers_vf - Inits function pointers
  57  *  @hw: pointer to the HW structure
  58  **/
  59 void e1000_init_function_pointers_vf(struct e1000_hw *hw)
  60 {
  61         hw->mac.ops.init_params = e1000_init_mac_params_vf;
  62         hw->mbx.ops.init_params = e1000_init_mbx_params_vf;
  63 }
  64
  65 /**
  66  *  e1000_get_link_up_info_vf - Gets link info.
  67  *  @hw: pointer to the HW structure
  68  *  @speed: pointer to 16 bit value to store link speed.
  69  *  @duplex: pointer to 16 bit value to store duplex.
  70  *
  71  *  Since we cannot read the PHY and get accurate link info, we must rely upon
  72  *  the status register's data which is often stale and inaccurate.
  73  **/
  74 static s32 e1000_get_link_up_info_vf(struct e1000_hw *hw, u16 *speed,
  75                                      u16 *duplex)
  76 {
  77         s32 status;
  78
  79         status = er32(STATUS);
  80         if (status & E1000_STATUS_SPEED_1000)
  81                 *speed = SPEED_1000;
  82         else if (status & E1000_STATUS_SPEED_100)
  83                 *speed = SPEED_100;
  84         else
  85                 *speed = SPEED_10;
  86
  87         if (status & E1000_STATUS_FD)
  88                 *duplex = FULL_DUPLEX;
  89         else
  90                 *duplex = HALF_DUPLEX;
  91
  92         return E1000_SUCCESS;
  93 }
  94
  95 /**
  96  *  e1000_reset_hw_vf - Resets the HW
  97  *  @hw: pointer to the HW structure
  98  *
  99  *  VF's provide a function level reset. This is done using bit 26 of ctrl_reg.
 100  *  This is all the reset we can perform on a VF.
 101  **/
 102 static s32 e1000_reset_hw_vf(struct e1000_hw *hw)
 103 {
 104         struct e1000_mbx_info *mbx = &hw->mbx;
 105         u32 timeout = E1000_VF_INIT_TIMEOUT;
 106         u32 ret_val = -E1000_ERR_MAC_INIT;
 107         u32 msgbuf[3];
 108         u8 *addr = (u8 *)(&msgbuf[1]);
 109         u32 ctrl;
 110
 111         /* assert VF queue/interrupt reset */
 112         ctrl = er32(CTRL);
 113         ew32(CTRL, ctrl | E1000_CTRL_RST);
 114
 115         /* we cannot initialize while the RSTI / RSTD bits are asserted */
 116         while (!mbx->ops.check_for_rst(hw) && timeout) {
 117                 timeout--;
 118                 udelay(5);
 119         }
 120
 121         if (timeout) {
 122                 /* mailbox timeout can now become active */
 123                 mbx->timeout = E1000_VF_MBX_INIT_TIMEOUT;
 124
 125                 /* notify PF of VF reset completion */
 126                 msgbuf[0] = E1000_VF_RESET;
 127                 mbx->ops.write_posted(hw, msgbuf, 1);
 128
 129                 mdelay(10);
 130
 131                 /* set our "perm_addr" based on info provided by PF */
 132                 ret_val = mbx->ops.read_posted(hw, msgbuf, 3);
 133                 if (!ret_val) {
 134                         if (msgbuf[0] == (E1000_VF_RESET |
 135                                           E1000_VT_MSGTYPE_ACK))
 136                                 memcpy(hw->mac.perm_addr, addr, ETH_ALEN);
 137                         else
 138                                 ret_val = -E1000_ERR_MAC_INIT;
 139                 }
 140         }
 141
 142         return ret_val;
 143 }
 144
 145 /**
 146  *  e1000_init_hw_vf - Inits the HW
 147  *  @hw: pointer to the HW structure
 148  *
 149  *  Not much to do here except clear the PF Reset indication if there is one.
 150  **/
 151 static s32 e1000_init_hw_vf(struct e1000_hw *hw)
 152 {
 153         /* attempt to set and restore our mac address */
 154         e1000_rar_set_vf(hw, hw->mac.addr, 0);
 155
 156         return E1000_SUCCESS;
 157 }
 158
 159 /**
 160  *  e1000_hash_mc_addr_vf - Generate a multicast hash value
 161  *  @hw: pointer to the HW structure
 162  *  @mc_addr: pointer to a multicast address
 163  *
 164  *  Generates a multicast address hash value which is used to determine
 165  *  the multicast filter table array address and new table value.  See
 166  *  e1000_mta_set_generic()
 167  **/
 168 static u32 e1000_hash_mc_addr_vf(struct e1000_hw *hw, u8 *mc_addr)
 169 {
 170         u32 hash_value, hash_mask;
 171         u8 bit_shift = 0;
 172
 173         /* Register count multiplied by bits per register */
 174         hash_mask = (hw->mac.mta_reg_count * 32) - 1;
 175
 176         /* The bit_shift is the number of left-shifts
 177          * where 0xFF would still fall within the hash mask.
 178          */
 179         while (hash_mask >> bit_shift != 0xFF)
 180                 bit_shift++;
 181
 182         hash_value = hash_mask & (((mc_addr[4] >> (8 - bit_shift)) |
 183                                   (((u16)mc_addr[5]) << bit_shift)));
 184
 185         return hash_value;
 186 }
 187
 188 /**
 189  *  e1000_update_mc_addr_list_vf - Update Multicast addresses
 190  *  @hw: pointer to the HW structure
 191  *  @mc_addr_list: array of multicast addresses to program
 192  *  @mc_addr_count: number of multicast addresses to program
 193  *  @rar_used_count: the first RAR register free to program
 194  *  @rar_count: total number of supported Receive Address Registers
 195  *
 196  *  Updates the Receive Address Registers and Multicast Table Array.
 197  *  The caller must have a packed mc_addr_list of multicast addresses.
 198  *  The parameter rar_count will usually be hw->mac.rar_entry_count
 199  *  unless there are workarounds that change this.
 200  **/
 201 static void e1000_update_mc_addr_list_vf(struct e1000_hw *hw,
 202                                          u8 *mc_addr_list, u32 mc_addr_count,
 203                                          u32 rar_used_count, u32 rar_count)
 204 {
 205         struct e1000_mbx_info *mbx = &hw->mbx;
 206         u32 msgbuf[E1000_VFMAILBOX_SIZE];
 207         u16 *hash_list = (u16 *)&msgbuf[1];
 208         u32 hash_value;
 209         u32 cnt, i;
 210         s32 ret_val;
 211
 212         /* Each entry in the list uses 1 16 bit word.  We have 30
 213          * 16 bit words available in our HW msg buffer (minus 1 for the
 214          * msg type).  That's 30 hash values if we pack 'em right.  If
 215          * there are more than 30 MC addresses to add then punt the
 216          * extras for now and then add code to handle more than 30 later.
 217          * It would be unusual for a server to request that many multi-cast
 218          * addresses except for in large enterprise network environments.
 219          */
 220
 221         cnt = (mc_addr_count > 30) ? 30 : mc_addr_count;
 222         msgbuf[0] = E1000_VF_SET_MULTICAST;
 223         msgbuf[0] |= cnt << E1000_VT_MSGINFO_SHIFT;
 224
 225         for (i = 0; i < cnt; i++) {
 226                 hash_value = e1000_hash_mc_addr_vf(hw, mc_addr_list);
 227                 hash_list[i] = hash_value & 0x0FFFF;
 228                 mc_addr_list += ETH_ALEN;
 229         }
 230
 231         ret_val = mbx->ops.write_posted(hw, msgbuf, E1000_VFMAILBOX_SIZE);
 232         if (!ret_val)
 233                 mbx->ops.read_posted(hw, msgbuf, 1);
 234 }
 235
 236 /**
 237  *  e1000_set_vfta_vf - Set/Unset vlan filter table address
 238  *  @hw: pointer to the HW structure
 239  *  @vid: determines the vfta register and bit to set/unset
 240  *  @set: if true then set bit, else clear bit
 241  **/
 242 static s32 e1000_set_vfta_vf(struct e1000_hw *hw, u16 vid, bool set)
 243 {
 244         struct e1000_mbx_info *mbx = &hw->mbx;
 245         u32 msgbuf[2];
 246         s32 err;
 247
 248         msgbuf[0] = E1000_VF_SET_VLAN;
 249         msgbuf[1] = vid;
 250         /* Setting the 8 bit field MSG INFO to true indicates "add" */
 251         if (set)
 252                 msgbuf[0] |= BIT(E1000_VT_MSGINFO_SHIFT);
 253
 254         mbx->ops.write_posted(hw, msgbuf, 2);
 255
 256         err = mbx->ops.read_posted(hw, msgbuf, 2);
 257
 258         msgbuf[0] &= ~E1000_VT_MSGTYPE_CTS;
 259
 260         /* if nacked the vlan was rejected */
 261         if (!err && (msgbuf[0] == (E1000_VF_SET_VLAN | E1000_VT_MSGTYPE_NACK)))
 262                 err = -E1000_ERR_MAC_INIT;
 263
 264         return err;
 265 }
 266
 267 /**
 268  *  e1000_rlpml_set_vf - Set the maximum receive packet length
 269  *  @hw: pointer to the HW structure
 270  *  @max_size: value to assign to max frame size
 271  **/
 272 void e1000_rlpml_set_vf(struct e1000_hw *hw, u16 max_size)
 273 {
 274         struct e1000_mbx_info *mbx = &hw->mbx;
 275         u32 msgbuf[2];
 276         s32 ret_val;
 277
 278         msgbuf[0] = E1000_VF_SET_LPE;
 279         msgbuf[1] = max_size;
 280
 281         ret_val = mbx->ops.write_posted(hw, msgbuf, 2);
 282         if (!ret_val)
 283                 mbx->ops.read_posted(hw, msgbuf, 1);
 284 }
 285
 286 /**
 287  *  e1000_rar_set_vf - set device MAC address
 288  *  @hw: pointer to the HW structure
 289  *  @addr: pointer to the receive address
 290  *  @index: receive address array register
 291  **/
 292 static void e1000_rar_set_vf(struct e1000_hw *hw, u8 *addr, u32 index)
 293 {
 294         struct e1000_mbx_info *mbx = &hw->mbx;
 295         u32 msgbuf[3];
 296         u8 *msg_addr = (u8 *)(&msgbuf[1]);
 297         s32 ret_val;
 298
 299         memset(msgbuf, 0, 12);
 300         msgbuf[0] = E1000_VF_SET_MAC_ADDR;
 301         memcpy(msg_addr, addr, ETH_ALEN);
 302         ret_val = mbx->ops.write_posted(hw, msgbuf, 3);
 303
 304         if (!ret_val)
 305                 ret_val = mbx->ops.read_posted(hw, msgbuf, 3);
 306
 307         msgbuf[0] &= ~E1000_VT_MSGTYPE_CTS;
 308
 309         /* if nacked the address was rejected, use "perm_addr" */
 310         if (!ret_val &&
 311             (msgbuf[0] == (E1000_VF_SET_MAC_ADDR | E1000_VT_MSGTYPE_NACK)))
 312                 e1000_read_mac_addr_vf(hw);
 313 }
 314
 315 /**
 316  *  e1000_read_mac_addr_vf - Read device MAC address
 317  *  @hw: pointer to the HW structure
 318  **/
 319 static s32 e1000_read_mac_addr_vf(struct e1000_hw *hw)
 320 {
 321         memcpy(hw->mac.addr, hw->mac.perm_addr, ETH_ALEN);
 322
 323         return E1000_SUCCESS;
 324 }
 325
 326 /**
 327  *  e1000_set_uc_addr_vf - Set or clear unicast filters
 328  *  @hw: pointer to the HW structure
 329  *  @sub_cmd: add or clear filters
 330  *  @addr: pointer to the filter MAC address
 331  **/
 332 static s32 e1000_set_uc_addr_vf(struct e1000_hw *hw, u32 sub_cmd, u8 *addr)
 333 {
 334         struct e1000_mbx_info *mbx = &hw->mbx;
 335         u32 msgbuf[3], msgbuf_chk;
 336         u8 *msg_addr = (u8 *)(&msgbuf[1]);
 337         s32 ret_val;
 338
 339         memset(msgbuf, 0, sizeof(msgbuf));
 340         msgbuf[0] |= sub_cmd;
 341         msgbuf[0] |= E1000_VF_SET_MAC_ADDR;
 342         msgbuf_chk = msgbuf[0];
 343
 344         if (addr)
 345                 memcpy(msg_addr, addr, ETH_ALEN);
 346
 347         ret_val = mbx->ops.write_posted(hw, msgbuf, 3);
 348
 349         if (!ret_val)
 350                 ret_val = mbx->ops.read_posted(hw, msgbuf, 3);
 351
 352         msgbuf[0] &= ~E1000_VT_MSGTYPE_CTS;
 353
 354         if (!ret_val) {
 355                 msgbuf[0] &= ~E1000_VT_MSGTYPE_CTS;
 356
 357                 if (msgbuf[0] == (msgbuf_chk | E1000_VT_MSGTYPE_NACK))
 358                         return -ENOSPC;
 359         }
 360
 361         return ret_val;
 362 }
 363
 364 /**
 365  *  e1000_check_for_link_vf - Check for link for a virtual interface
 366  *  @hw: pointer to the HW structure
 367  *
 368  *  Checks to see if the underlying PF is still talking to the VF and
 369  *  if it is then it reports the link state to the hardware, otherwise
 370  *  it reports link down and returns an error.
 371  **/
 372 static s32 e1000_check_for_link_vf(struct e1000_hw *hw)
 373 {
 374         struct e1000_mbx_info *mbx = &hw->mbx;
 375         struct e1000_mac_info *mac = &hw->mac;
 376         s32 ret_val = E1000_SUCCESS;
 377         u32 in_msg = 0;
 378
 379         /* We only want to run this if there has been a rst asserted.
 380          * in this case that could mean a link change, device reset,
 381          * or a virtual function reset
 382          */
 383
 384         /* If we were hit with a reset or timeout drop the link */
 385         if (!mbx->ops.check_for_rst(hw) || !mbx->timeout)
 386                 mac->get_link_status = true;
 387
 388         if (!mac->get_link_status)
 389                 goto out;
 390
 391         /* if link status is down no point in checking to see if PF is up */
 392         if (!(er32(STATUS) & E1000_STATUS_LU))
 393                 goto out;
 394
 395         /* if the read failed it could just be a mailbox collision, best wait
 396          * until we are called again and don't report an error
 397          */
 398         if (mbx->ops.read(hw, &in_msg, 1))
 399                 goto out;
 400
 401         /* if incoming message isn't clear to send we are waiting on response */
 402         if (!(in_msg & E1000_VT_MSGTYPE_CTS)) {
 403                 /* msg is not CTS and is NACK we must have lost CTS status */
 404                 if (in_msg & E1000_VT_MSGTYPE_NACK)
 405                         ret_val = -E1000_ERR_MAC_INIT;
 406                 goto out;
 407         }
 408
 409         /* the PF is talking, if we timed out in the past we reinit */
 410         if (!mbx->timeout) {
 411                 ret_val = -E1000_ERR_MAC_INIT;
 412                 goto out;
 413         }
 414
 415         /* if we passed all the tests above then the link is up and we no
 416          * longer need to check for link
 417          */
 418         mac->get_link_status = false;
 419
 420 out:
 421         return ret_val;
 422 }
 423