436 lines · c
1// SPDX-License-Identifier: GPL-2.02/* Copyright(c) 1999 - 2018 Intel Corporation. */3 4#include <linux/pci.h>5#include <linux/delay.h>6#include "ixgbe.h"7#include "ixgbe_mbx.h"8 9/**10 * ixgbe_read_mbx - Reads a message from the mailbox11 * @hw: pointer to the HW structure12 * @msg: The message buffer13 * @size: Length of buffer14 * @mbx_id: id of mailbox to read15 *16 * returns SUCCESS if it successfully read message from buffer17 **/18int ixgbe_read_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, u16 mbx_id)19{20 struct ixgbe_mbx_info *mbx = &hw->mbx;21 22 /* limit read to size of mailbox */23 if (size > mbx->size)24 size = mbx->size;25 26 if (!mbx->ops)27 return -EIO;28 29 return mbx->ops->read(hw, msg, size, mbx_id);30}31 32/**33 * ixgbe_write_mbx - Write a message to the mailbox34 * @hw: pointer to the HW structure35 * @msg: The message buffer36 * @size: Length of buffer37 * @mbx_id: id of mailbox to write38 *39 * returns SUCCESS if it successfully copied message into the buffer40 **/41int ixgbe_write_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, u16 mbx_id)42{43 struct ixgbe_mbx_info *mbx = &hw->mbx;44 45 if (size > mbx->size)46 return -EINVAL;47 48 if (!mbx->ops)49 return -EIO;50 51 return mbx->ops->write(hw, msg, size, mbx_id);52}53 54/**55 * ixgbe_check_for_msg - checks to see if someone sent us mail56 * @hw: pointer to the HW structure57 * @mbx_id: id of mailbox to check58 *59 * returns SUCCESS if the Status bit was found or else ERR_MBX60 **/61int ixgbe_check_for_msg(struct ixgbe_hw *hw, u16 mbx_id)62{63 struct ixgbe_mbx_info *mbx = &hw->mbx;64 65 if (!mbx->ops)66 return -EIO;67 68 return mbx->ops->check_for_msg(hw, mbx_id);69}70 71/**72 * ixgbe_check_for_ack - checks to see if someone sent us ACK73 * @hw: pointer to the HW structure74 * @mbx_id: id of mailbox to check75 *76 * returns SUCCESS if the Status bit was found or else ERR_MBX77 **/78int ixgbe_check_for_ack(struct ixgbe_hw *hw, u16 mbx_id)79{80 struct ixgbe_mbx_info *mbx = &hw->mbx;81 82 if (!mbx->ops)83 return -EIO;84 85 return mbx->ops->check_for_ack(hw, mbx_id);86}87 88/**89 * ixgbe_check_for_rst - checks to see if other side has reset90 * @hw: pointer to the HW structure91 * @mbx_id: id of mailbox to check92 *93 * returns SUCCESS if the Status bit was found or else ERR_MBX94 **/95int ixgbe_check_for_rst(struct ixgbe_hw *hw, u16 mbx_id)96{97 struct ixgbe_mbx_info *mbx = &hw->mbx;98 99 if (!mbx->ops)100 return -EIO;101 102 return mbx->ops->check_for_rst(hw, mbx_id);103}104 105/**106 * ixgbe_poll_for_msg - Wait for message notification107 * @hw: pointer to the HW structure108 * @mbx_id: id of mailbox to write109 *110 * returns SUCCESS if it successfully received a message notification111 **/112static int ixgbe_poll_for_msg(struct ixgbe_hw *hw, u16 mbx_id)113{114 struct ixgbe_mbx_info *mbx = &hw->mbx;115 int countdown = mbx->timeout;116 117 if (!countdown || !mbx->ops)118 return -EIO;119 120 while (mbx->ops->check_for_msg(hw, mbx_id)) {121 countdown--;122 if (!countdown)123 return -EIO;124 udelay(mbx->usec_delay);125 }126 127 return 0;128}129 130/**131 * ixgbe_poll_for_ack - Wait for message acknowledgement132 * @hw: pointer to the HW structure133 * @mbx_id: id of mailbox to write134 *135 * returns SUCCESS if it successfully received a message acknowledgement136 **/137static int ixgbe_poll_for_ack(struct ixgbe_hw *hw, u16 mbx_id)138{139 struct ixgbe_mbx_info *mbx = &hw->mbx;140 int countdown = mbx->timeout;141 142 if (!countdown || !mbx->ops)143 return -EIO;144 145 while (mbx->ops->check_for_ack(hw, mbx_id)) {146 countdown--;147 if (!countdown)148 return -EIO;149 udelay(mbx->usec_delay);150 }151 152 return 0;153}154 155/**156 * ixgbe_read_posted_mbx - Wait for message notification and receive message157 * @hw: pointer to the HW structure158 * @msg: The message buffer159 * @size: Length of buffer160 * @mbx_id: id of mailbox to write161 *162 * returns SUCCESS if it successfully received a message notification and163 * copied it into the receive buffer.164 **/165static int ixgbe_read_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size,166 u16 mbx_id)167{168 struct ixgbe_mbx_info *mbx = &hw->mbx;169 int ret_val;170 171 if (!mbx->ops)172 return -EIO;173 174 ret_val = ixgbe_poll_for_msg(hw, mbx_id);175 if (ret_val)176 return ret_val;177 178 /* if ack received read message */179 return mbx->ops->read(hw, msg, size, mbx_id);180}181 182/**183 * ixgbe_write_posted_mbx - Write a message to the mailbox, wait for ack184 * @hw: pointer to the HW structure185 * @msg: The message buffer186 * @size: Length of buffer187 * @mbx_id: id of mailbox to write188 *189 * returns SUCCESS if it successfully copied message into the buffer and190 * received an ack to that message within delay * timeout period191 **/192static int ixgbe_write_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size,193 u16 mbx_id)194{195 struct ixgbe_mbx_info *mbx = &hw->mbx;196 int ret_val;197 198 /* exit if either we can't write or there isn't a defined timeout */199 if (!mbx->ops || !mbx->timeout)200 return -EIO;201 202 /* send msg */203 ret_val = mbx->ops->write(hw, msg, size, mbx_id);204 if (ret_val)205 return ret_val;206 207 /* if msg sent wait until we receive an ack */208 return ixgbe_poll_for_ack(hw, mbx_id);209}210 211static int ixgbe_check_for_bit_pf(struct ixgbe_hw *hw, u32 mask, s32 index)212{213 u32 mbvficr = IXGBE_READ_REG(hw, IXGBE_MBVFICR(index));214 215 if (mbvficr & mask) {216 IXGBE_WRITE_REG(hw, IXGBE_MBVFICR(index), mask);217 return 0;218 }219 220 return -EIO;221}222 223/**224 * ixgbe_check_for_msg_pf - checks to see if the VF has sent mail225 * @hw: pointer to the HW structure226 * @vf_number: the VF index227 *228 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX229 **/230static int ixgbe_check_for_msg_pf(struct ixgbe_hw *hw, u16 vf_number)231{232 int index = IXGBE_MBVFICR_INDEX(vf_number);233 u32 vf_bit = vf_number % 16;234 235 if (!ixgbe_check_for_bit_pf(hw, IXGBE_MBVFICR_VFREQ_VF1 << vf_bit,236 index)) {237 hw->mbx.stats.reqs++;238 return 0;239 }240 241 return -EIO;242}243 244/**245 * ixgbe_check_for_ack_pf - checks to see if the VF has ACKed246 * @hw: pointer to the HW structure247 * @vf_number: the VF index248 *249 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX250 **/251static int ixgbe_check_for_ack_pf(struct ixgbe_hw *hw, u16 vf_number)252{253 int index = IXGBE_MBVFICR_INDEX(vf_number);254 u32 vf_bit = vf_number % 16;255 256 if (!ixgbe_check_for_bit_pf(hw, IXGBE_MBVFICR_VFACK_VF1 << vf_bit,257 index)) {258 hw->mbx.stats.acks++;259 return 0;260 }261 262 return -EIO;263}264 265/**266 * ixgbe_check_for_rst_pf - checks to see if the VF has reset267 * @hw: pointer to the HW structure268 * @vf_number: the VF index269 *270 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX271 **/272static int ixgbe_check_for_rst_pf(struct ixgbe_hw *hw, u16 vf_number)273{274 u32 reg_offset = (vf_number < 32) ? 0 : 1;275 u32 vf_shift = vf_number % 32;276 u32 vflre = 0;277 278 switch (hw->mac.type) {279 case ixgbe_mac_82599EB:280 vflre = IXGBE_READ_REG(hw, IXGBE_VFLRE(reg_offset));281 break;282 case ixgbe_mac_X540:283 case ixgbe_mac_X550:284 case ixgbe_mac_X550EM_x:285 case ixgbe_mac_x550em_a:286 vflre = IXGBE_READ_REG(hw, IXGBE_VFLREC(reg_offset));287 break;288 default:289 break;290 }291 292 if (vflre & BIT(vf_shift)) {293 IXGBE_WRITE_REG(hw, IXGBE_VFLREC(reg_offset), BIT(vf_shift));294 hw->mbx.stats.rsts++;295 return 0;296 }297 298 return -EIO;299}300 301/**302 * ixgbe_obtain_mbx_lock_pf - obtain mailbox lock303 * @hw: pointer to the HW structure304 * @vf_number: the VF index305 *306 * return SUCCESS if we obtained the mailbox lock307 **/308static int ixgbe_obtain_mbx_lock_pf(struct ixgbe_hw *hw, u16 vf_number)309{310 u32 p2v_mailbox;311 312 /* Take ownership of the buffer */313 IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_PFU);314 315 /* reserve mailbox for vf use */316 p2v_mailbox = IXGBE_READ_REG(hw, IXGBE_PFMAILBOX(vf_number));317 if (p2v_mailbox & IXGBE_PFMAILBOX_PFU)318 return 0;319 320 return -EIO;321}322 323/**324 * ixgbe_write_mbx_pf - Places a message in the mailbox325 * @hw: pointer to the HW structure326 * @msg: The message buffer327 * @size: Length of buffer328 * @vf_number: the VF index329 *330 * returns SUCCESS if it successfully copied message into the buffer331 **/332static int ixgbe_write_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size,333 u16 vf_number)334{335 int ret_val;336 u16 i;337 338 /* lock the mailbox to prevent pf/vf race condition */339 ret_val = ixgbe_obtain_mbx_lock_pf(hw, vf_number);340 if (ret_val)341 return ret_val;342 343 /* flush msg and acks as we are overwriting the message buffer */344 ixgbe_check_for_msg_pf(hw, vf_number);345 ixgbe_check_for_ack_pf(hw, vf_number);346 347 /* copy the caller specified message to the mailbox memory buffer */348 for (i = 0; i < size; i++)349 IXGBE_WRITE_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_number), i, msg[i]);350 351 /* Interrupt VF to tell it a message has been sent and release buffer*/352 IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_STS);353 354 /* update stats */355 hw->mbx.stats.msgs_tx++;356 357 return 0;358}359 360/**361 * ixgbe_read_mbx_pf - Read a message from the mailbox362 * @hw: pointer to the HW structure363 * @msg: The message buffer364 * @size: Length of buffer365 * @vf_number: the VF index366 *367 * This function copies a message from the mailbox buffer to the caller's368 * memory buffer. The presumption is that the caller knows that there was369 * a message due to a VF request so no polling for message is needed.370 **/371static int ixgbe_read_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size,372 u16 vf_number)373{374 int ret_val;375 u16 i;376 377 /* lock the mailbox to prevent pf/vf race condition */378 ret_val = ixgbe_obtain_mbx_lock_pf(hw, vf_number);379 if (ret_val)380 return ret_val;381 382 /* copy the message to the mailbox memory buffer */383 for (i = 0; i < size; i++)384 msg[i] = IXGBE_READ_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_number), i);385 386 /* Acknowledge the message and release buffer */387 IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_ACK);388 389 /* update stats */390 hw->mbx.stats.msgs_rx++;391 392 return 0;393}394 395#ifdef CONFIG_PCI_IOV396/**397 * ixgbe_init_mbx_params_pf - set initial values for pf mailbox398 * @hw: pointer to the HW structure399 *400 * Initializes the hw->mbx struct to correct values for pf mailbox401 */402void ixgbe_init_mbx_params_pf(struct ixgbe_hw *hw)403{404 struct ixgbe_mbx_info *mbx = &hw->mbx;405 406 if (hw->mac.type != ixgbe_mac_82599EB &&407 hw->mac.type != ixgbe_mac_X550 &&408 hw->mac.type != ixgbe_mac_X550EM_x &&409 hw->mac.type != ixgbe_mac_x550em_a &&410 hw->mac.type != ixgbe_mac_X540)411 return;412 413 mbx->timeout = 0;414 mbx->usec_delay = 0;415 416 mbx->stats.msgs_tx = 0;417 mbx->stats.msgs_rx = 0;418 mbx->stats.reqs = 0;419 mbx->stats.acks = 0;420 mbx->stats.rsts = 0;421 422 mbx->size = IXGBE_VFMAILBOX_SIZE;423}424#endif /* CONFIG_PCI_IOV */425 426const struct ixgbe_mbx_operations mbx_ops_generic = {427 .read = ixgbe_read_mbx_pf,428 .write = ixgbe_write_mbx_pf,429 .read_posted = ixgbe_read_posted_mbx,430 .write_posted = ixgbe_write_posted_mbx,431 .check_for_msg = ixgbe_check_for_msg_pf,432 .check_for_ack = ixgbe_check_for_ack_pf,433 .check_for_rst = ixgbe_check_for_rst_pf,434};435 436