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, write to the Free Software Foundation, Inc., 17 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA. 18 19 The full GNU General Public License is included in this distribution in 20 the file called "COPYING". 21 22 Contact Information: 23 e1000-devel Mailing List <e1000-devel@lists.sourceforge.net> 24 Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497 25 26 *******************************************************************************/ 27 28 29 #include "vf.h" 30 31 static s32 e1000_check_for_link_vf(struct e1000_hw *hw); 32 static s32 e1000_get_link_up_info_vf(struct e1000_hw *hw, u16 *speed, 33 u16 *duplex); 34 static s32 e1000_init_hw_vf(struct e1000_hw *hw); 35 static s32 e1000_reset_hw_vf(struct e1000_hw *hw); 36 37 static void e1000_update_mc_addr_list_vf(struct e1000_hw *hw, u8 *, 38 u32, u32, u32); 39 static void e1000_rar_set_vf(struct e1000_hw *, u8 *, u32); 40 static s32 e1000_read_mac_addr_vf(struct e1000_hw *); 41 static s32 e1000_set_vfta_vf(struct e1000_hw *, u16, bool); 42 43 /** 44 * e1000_init_mac_params_vf - Inits MAC params 45 * @hw: pointer to the HW structure 46 **/ 47 static s32 e1000_init_mac_params_vf(struct e1000_hw *hw) 48 { 49 struct e1000_mac_info *mac = &hw->mac; 50 51 /* VF's have no MTA Registers - PF feature only */ 52 mac->mta_reg_count = 128; 53 /* VF's have no access to RAR entries */ 54 mac->rar_entry_count = 1; 55 56 /* Function pointers */ 57 /* reset */ 58 mac->ops.reset_hw = e1000_reset_hw_vf; 59 /* hw initialization */ 60 mac->ops.init_hw = e1000_init_hw_vf; 61 /* check for link */ 62 mac->ops.check_for_link = e1000_check_for_link_vf; 63 /* link info */ 64 mac->ops.get_link_up_info = e1000_get_link_up_info_vf; 65 /* multicast address update */ 66 mac->ops.update_mc_addr_list = e1000_update_mc_addr_list_vf; 67 /* set mac address */ 68 mac->ops.rar_set = e1000_rar_set_vf; 69 /* read mac address */ 70 mac->ops.read_mac_addr = e1000_read_mac_addr_vf; 71 /* set vlan filter table array */ 72 mac->ops.set_vfta = e1000_set_vfta_vf; 73 74 return E1000_SUCCESS; 75 } 76 77 /** 78 * e1000_init_function_pointers_vf - Inits function pointers 79 * @hw: pointer to the HW structure 80 **/ 81 void e1000_init_function_pointers_vf(struct e1000_hw *hw) 82 { 83 hw->mac.ops.init_params = e1000_init_mac_params_vf; 84 hw->mbx.ops.init_params = e1000_init_mbx_params_vf; 85 } 86 87 /** 88 * e1000_get_link_up_info_vf - Gets link info. 89 * @hw: pointer to the HW structure 90 * @speed: pointer to 16 bit value to store link speed. 91 * @duplex: pointer to 16 bit value to store duplex. 92 * 93 * Since we cannot read the PHY and get accurate link info, we must rely upon 94 * the status register's data which is often stale and inaccurate. 95 **/ 96 static s32 e1000_get_link_up_info_vf(struct e1000_hw *hw, u16 *speed, 97 u16 *duplex) 98 { 99 s32 status; 100 101 status = er32(STATUS); 102 if (status & E1000_STATUS_SPEED_1000) 103 *speed = SPEED_1000; 104 else if (status & E1000_STATUS_SPEED_100) 105 *speed = SPEED_100; 106 else 107 *speed = SPEED_10; 108 109 if (status & E1000_STATUS_FD) 110 *duplex = FULL_DUPLEX; 111 else 112 *duplex = HALF_DUPLEX; 113 114 return E1000_SUCCESS; 115 } 116 117 /** 118 * e1000_reset_hw_vf - Resets the HW 119 * @hw: pointer to the HW structure 120 * 121 * VF's provide a function level reset. This is done using bit 26 of ctrl_reg. 122 * This is all the reset we can perform on a VF. 123 **/ 124 static s32 e1000_reset_hw_vf(struct e1000_hw *hw) 125 { 126 struct e1000_mbx_info *mbx = &hw->mbx; 127 u32 timeout = E1000_VF_INIT_TIMEOUT; 128 u32 ret_val = -E1000_ERR_MAC_INIT; 129 u32 msgbuf[3]; 130 u8 *addr = (u8 *)(&msgbuf[1]); 131 u32 ctrl; 132 133 /* assert vf queue/interrupt reset */ 134 ctrl = er32(CTRL); 135 ew32(CTRL, ctrl | E1000_CTRL_RST); 136 137 /* we cannot initialize while the RSTI / RSTD bits are asserted */ 138 while (!mbx->ops.check_for_rst(hw) && timeout) { 139 timeout--; 140 udelay(5); 141 } 142 143 if (timeout) { 144 /* mailbox timeout can now become active */ 145 mbx->timeout = E1000_VF_MBX_INIT_TIMEOUT; 146 147 /* notify pf of vf reset completion */ 148 msgbuf[0] = E1000_VF_RESET; 149 mbx->ops.write_posted(hw, msgbuf, 1); 150 151 msleep(10); 152 153 /* set our "perm_addr" based on info provided by PF */ 154 ret_val = mbx->ops.read_posted(hw, msgbuf, 3); 155 if (!ret_val) { 156 if (msgbuf[0] == (E1000_VF_RESET | E1000_VT_MSGTYPE_ACK)) 157 memcpy(hw->mac.perm_addr, addr, ETH_ALEN); 158 else 159 ret_val = -E1000_ERR_MAC_INIT; 160 } 161 } 162 163 return ret_val; 164 } 165 166 /** 167 * e1000_init_hw_vf - Inits the HW 168 * @hw: pointer to the HW structure 169 * 170 * Not much to do here except clear the PF Reset indication if there is one. 171 **/ 172 static s32 e1000_init_hw_vf(struct e1000_hw *hw) 173 { 174 /* attempt to set and restore our mac address */ 175 e1000_rar_set_vf(hw, hw->mac.addr, 0); 176 177 return E1000_SUCCESS; 178 } 179 180 /** 181 * e1000_hash_mc_addr_vf - Generate a multicast hash value 182 * @hw: pointer to the HW structure 183 * @mc_addr: pointer to a multicast address 184 * 185 * Generates a multicast address hash value which is used to determine 186 * the multicast filter table array address and new table value. See 187 * e1000_mta_set_generic() 188 **/ 189 static u32 e1000_hash_mc_addr_vf(struct e1000_hw *hw, u8 *mc_addr) 190 { 191 u32 hash_value, hash_mask; 192 u8 bit_shift = 0; 193 194 /* Register count multiplied by bits per register */ 195 hash_mask = (hw->mac.mta_reg_count * 32) - 1; 196 197 /* 198 * The bit_shift is the number of left-shifts 199 * where 0xFF would still fall within the hash mask. 200 */ 201 while (hash_mask >> bit_shift != 0xFF) 202 bit_shift++; 203 204 hash_value = hash_mask & (((mc_addr[4] >> (8 - bit_shift)) | 205 (((u16) mc_addr[5]) << bit_shift))); 206 207 return hash_value; 208 } 209 210 /** 211 * e1000_update_mc_addr_list_vf - Update Multicast addresses 212 * @hw: pointer to the HW structure 213 * @mc_addr_list: array of multicast addresses to program 214 * @mc_addr_count: number of multicast addresses to program 215 * @rar_used_count: the first RAR register free to program 216 * @rar_count: total number of supported Receive Address Registers 217 * 218 * Updates the Receive Address Registers and Multicast Table Array. 219 * The caller must have a packed mc_addr_list of multicast addresses. 220 * The parameter rar_count will usually be hw->mac.rar_entry_count 221 * unless there are workarounds that change this. 222 **/ 223 static void e1000_update_mc_addr_list_vf(struct e1000_hw *hw, 224 u8 *mc_addr_list, u32 mc_addr_count, 225 u32 rar_used_count, u32 rar_count) 226 { 227 struct e1000_mbx_info *mbx = &hw->mbx; 228 u32 msgbuf[E1000_VFMAILBOX_SIZE]; 229 u16 *hash_list = (u16 *)&msgbuf[1]; 230 u32 hash_value; 231 u32 cnt, i; 232 233 /* Each entry in the list uses 1 16 bit word. We have 30 234 * 16 bit words available in our HW msg buffer (minus 1 for the 235 * msg type). That's 30 hash values if we pack 'em right. If 236 * there are more than 30 MC addresses to add then punt the 237 * extras for now and then add code to handle more than 30 later. 238 * It would be unusual for a server to request that many multi-cast 239 * addresses except for in large enterprise network environments. 240 */ 241 242 cnt = (mc_addr_count > 30) ? 30 : mc_addr_count; 243 msgbuf[0] = E1000_VF_SET_MULTICAST; 244 msgbuf[0] |= cnt << E1000_VT_MSGINFO_SHIFT; 245 246 for (i = 0; i < cnt; i++) { 247 hash_value = e1000_hash_mc_addr_vf(hw, mc_addr_list); 248 hash_list[i] = hash_value & 0x0FFFF; 249 mc_addr_list += ETH_ALEN; 250 } 251 252 mbx->ops.write_posted(hw, msgbuf, E1000_VFMAILBOX_SIZE); 253 } 254 255 /** 256 * e1000_set_vfta_vf - Set/Unset vlan filter table address 257 * @hw: pointer to the HW structure 258 * @vid: determines the vfta register and bit to set/unset 259 * @set: if true then set bit, else clear bit 260 **/ 261 static s32 e1000_set_vfta_vf(struct e1000_hw *hw, u16 vid, bool set) 262 { 263 struct e1000_mbx_info *mbx = &hw->mbx; 264 u32 msgbuf[2]; 265 s32 err; 266 267 msgbuf[0] = E1000_VF_SET_VLAN; 268 msgbuf[1] = vid; 269 /* Setting the 8 bit field MSG INFO to true indicates "add" */ 270 if (set) 271 msgbuf[0] |= 1 << E1000_VT_MSGINFO_SHIFT; 272 273 mbx->ops.write_posted(hw, msgbuf, 2); 274 275 err = mbx->ops.read_posted(hw, msgbuf, 2); 276 277 msgbuf[0] &= ~E1000_VT_MSGTYPE_CTS; 278 279 /* if nacked the vlan was rejected */ 280 if (!err && (msgbuf[0] == (E1000_VF_SET_VLAN | E1000_VT_MSGTYPE_NACK))) 281 err = -E1000_ERR_MAC_INIT; 282 283 return err; 284 } 285 286 /** 287 * e1000_rlpml_set_vf - Set the maximum receive packet length 288 * @hw: pointer to the HW structure 289 * @max_size: value to assign to max frame size 290 **/ 291 void e1000_rlpml_set_vf(struct e1000_hw *hw, u16 max_size) 292 { 293 struct e1000_mbx_info *mbx = &hw->mbx; 294 u32 msgbuf[2]; 295 296 msgbuf[0] = E1000_VF_SET_LPE; 297 msgbuf[1] = max_size; 298 299 mbx->ops.write_posted(hw, msgbuf, 2); 300 } 301 302 /** 303 * e1000_rar_set_vf - set device MAC address 304 * @hw: pointer to the HW structure 305 * @addr: pointer to the receive address 306 * @index: receive address array register 307 **/ 308 static void e1000_rar_set_vf(struct e1000_hw *hw, u8 * addr, u32 index) 309 { 310 struct e1000_mbx_info *mbx = &hw->mbx; 311 u32 msgbuf[3]; 312 u8 *msg_addr = (u8 *)(&msgbuf[1]); 313 s32 ret_val; 314 315 memset(msgbuf, 0, 12); 316 msgbuf[0] = E1000_VF_SET_MAC_ADDR; 317 memcpy(msg_addr, addr, ETH_ALEN); 318 ret_val = mbx->ops.write_posted(hw, msgbuf, 3); 319 320 if (!ret_val) 321 ret_val = mbx->ops.read_posted(hw, msgbuf, 3); 322 323 msgbuf[0] &= ~E1000_VT_MSGTYPE_CTS; 324 325 /* if nacked the address was rejected, use "perm_addr" */ 326 if (!ret_val && 327 (msgbuf[0] == (E1000_VF_SET_MAC_ADDR | E1000_VT_MSGTYPE_NACK))) 328 e1000_read_mac_addr_vf(hw); 329 } 330 331 /** 332 * e1000_read_mac_addr_vf - Read device MAC address 333 * @hw: pointer to the HW structure 334 **/ 335 static s32 e1000_read_mac_addr_vf(struct e1000_hw *hw) 336 { 337 memcpy(hw->mac.addr, hw->mac.perm_addr, ETH_ALEN); 338 339 return E1000_SUCCESS; 340 } 341 342 /** 343 * e1000_check_for_link_vf - Check for link for a virtual interface 344 * @hw: pointer to the HW structure 345 * 346 * Checks to see if the underlying PF is still talking to the VF and 347 * if it is then it reports the link state to the hardware, otherwise 348 * it reports link down and returns an error. 349 **/ 350 static s32 e1000_check_for_link_vf(struct e1000_hw *hw) 351 { 352 struct e1000_mbx_info *mbx = &hw->mbx; 353 struct e1000_mac_info *mac = &hw->mac; 354 s32 ret_val = E1000_SUCCESS; 355 u32 in_msg = 0; 356 357 /* 358 * We only want to run this if there has been a rst asserted. 359 * in this case that could mean a link change, device reset, 360 * or a virtual function reset 361 */ 362 363 /* If we were hit with a reset or timeout drop the link */ 364 if (!mbx->ops.check_for_rst(hw) || !mbx->timeout) 365 mac->get_link_status = true; 366 367 if (!mac->get_link_status) 368 goto out; 369 370 /* if link status is down no point in checking to see if pf is up */ 371 if (!(er32(STATUS) & E1000_STATUS_LU)) 372 goto out; 373 374 /* if the read failed it could just be a mailbox collision, best wait 375 * until we are called again and don't report an error */ 376 if (mbx->ops.read(hw, &in_msg, 1)) 377 goto out; 378 379 /* if incoming message isn't clear to send we are waiting on response */ 380 if (!(in_msg & E1000_VT_MSGTYPE_CTS)) { 381 /* message is not CTS and is NACK we must have lost CTS status */ 382 if (in_msg & E1000_VT_MSGTYPE_NACK) 383 ret_val = -E1000_ERR_MAC_INIT; 384 goto out; 385 } 386 387 /* the pf is talking, if we timed out in the past we reinit */ 388 if (!mbx->timeout) { 389 ret_val = -E1000_ERR_MAC_INIT; 390 goto out; 391 } 392 393 /* if we passed all the tests above then the link is up and we no 394 * longer need to check for link */ 395 mac->get_link_status = false; 396 397 out: 398 return ret_val; 399 } 400 401