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1// SPDX-License-Identifier: GPL-2.0
2/* 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 mailbox
11 * @hw: pointer to the HW structure
12 * @msg: The message buffer
13 * @size: Length of buffer
14 * @mbx_id: id of mailbox to read
15 *
16 * returns SUCCESS if it successfully read message from buffer
17 **/
18s32 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 mailbox
34 * @hw: pointer to the HW structure
35 * @msg: The message buffer
36 * @size: Length of buffer
37 * @mbx_id: id of mailbox to write
38 *
39 * returns SUCCESS if it successfully copied message into the buffer
40 **/
41s32 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 mail
56 * @hw: pointer to the HW structure
57 * @mbx_id: id of mailbox to check
58 *
59 * returns SUCCESS if the Status bit was found or else ERR_MBX
60 **/
61s32 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 ACK
73 * @hw: pointer to the HW structure
74 * @mbx_id: id of mailbox to check
75 *
76 * returns SUCCESS if the Status bit was found or else ERR_MBX
77 **/
78s32 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 reset
90 * @hw: pointer to the HW structure
91 * @mbx_id: id of mailbox to check
92 *
93 * returns SUCCESS if the Status bit was found or else ERR_MBX
94 **/
95s32 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 notification
107 * @hw: pointer to the HW structure
108 * @mbx_id: id of mailbox to write
109 *
110 * returns SUCCESS if it successfully received a message notification
111 **/
112static s32 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 acknowledgement
132 * @hw: pointer to the HW structure
133 * @mbx_id: id of mailbox to write
134 *
135 * returns SUCCESS if it successfully received a message acknowledgement
136 **/
137static s32 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 message
157 * @hw: pointer to the HW structure
158 * @msg: The message buffer
159 * @size: Length of buffer
160 * @mbx_id: id of mailbox to write
161 *
162 * returns SUCCESS if it successfully received a message notification and
163 * copied it into the receive buffer.
164 **/
165static s32 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 s32 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 ack
184 * @hw: pointer to the HW structure
185 * @msg: The message buffer
186 * @size: Length of buffer
187 * @mbx_id: id of mailbox to write
188 *
189 * returns SUCCESS if it successfully copied message into the buffer and
190 * received an ack to that message within delay * timeout period
191 **/
192static s32 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 s32 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 s32 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 mail
225 * @hw: pointer to the HW structure
226 * @vf_number: the VF index
227 *
228 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
229 **/
230static s32 ixgbe_check_for_msg_pf(struct ixgbe_hw *hw, u16 vf_number)
231{
232 s32 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 ACKed
246 * @hw: pointer to the HW structure
247 * @vf_number: the VF index
248 *
249 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
250 **/
251static s32 ixgbe_check_for_ack_pf(struct ixgbe_hw *hw, u16 vf_number)
252{
253 s32 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 reset
267 * @hw: pointer to the HW structure
268 * @vf_number: the VF index
269 *
270 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
271 **/
272static s32 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 lock
303 * @hw: pointer to the HW structure
304 * @vf_number: the VF index
305 *
306 * return SUCCESS if we obtained the mailbox lock
307 **/
308static s32 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 mailbox
325 * @hw: pointer to the HW structure
326 * @msg: The message buffer
327 * @size: Length of buffer
328 * @vf_number: the VF index
329 *
330 * returns SUCCESS if it successfully copied message into the buffer
331 **/
332static s32 ixgbe_write_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size,
333 u16 vf_number)
334{
335 s32 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 mailbox
362 * @hw: pointer to the HW structure
363 * @msg: The message buffer
364 * @size: Length of buffer
365 * @vf_number: the VF index
366 *
367 * This function copies a message from the mailbox buffer to the caller's
368 * memory buffer. The presumption is that the caller knows that there was
369 * a message due to a VF request so no polling for message is needed.
370 **/
371static s32 ixgbe_read_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size,
372 u16 vf_number)
373{
374 s32 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_IOV
396/**
397 * ixgbe_init_mbx_params_pf - set initial values for pf mailbox
398 * @hw: pointer to the HW structure
399 *
400 * Initializes the hw->mbx struct to correct values for pf mailbox
401 */
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
1/*******************************************************************************
2
3 Intel 10 Gigabit PCI Express Linux driver
4 Copyright(c) 1999 - 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#include <linux/pci.h>
29#include <linux/delay.h>
30#include "ixgbe_type.h"
31#include "ixgbe_common.h"
32#include "ixgbe_mbx.h"
33
34/**
35 * ixgbe_read_mbx - Reads a message from the mailbox
36 * @hw: pointer to the HW structure
37 * @msg: The message buffer
38 * @size: Length of buffer
39 * @mbx_id: id of mailbox to read
40 *
41 * returns SUCCESS if it successfully read message from buffer
42 **/
43s32 ixgbe_read_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, u16 mbx_id)
44{
45 struct ixgbe_mbx_info *mbx = &hw->mbx;
46 s32 ret_val = IXGBE_ERR_MBX;
47
48 /* limit read to size of mailbox */
49 if (size > mbx->size)
50 size = mbx->size;
51
52 if (mbx->ops.read)
53 ret_val = mbx->ops.read(hw, msg, size, mbx_id);
54
55 return ret_val;
56}
57
58/**
59 * ixgbe_write_mbx - Write a message to the mailbox
60 * @hw: pointer to the HW structure
61 * @msg: The message buffer
62 * @size: Length of buffer
63 * @mbx_id: id of mailbox to write
64 *
65 * returns SUCCESS if it successfully copied message into the buffer
66 **/
67s32 ixgbe_write_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size, u16 mbx_id)
68{
69 struct ixgbe_mbx_info *mbx = &hw->mbx;
70 s32 ret_val = 0;
71
72 if (size > mbx->size)
73 ret_val = IXGBE_ERR_MBX;
74
75 else if (mbx->ops.write)
76 ret_val = mbx->ops.write(hw, msg, size, mbx_id);
77
78 return ret_val;
79}
80
81/**
82 * ixgbe_check_for_msg - checks to see if someone sent us mail
83 * @hw: pointer to the HW structure
84 * @mbx_id: id of mailbox to check
85 *
86 * returns SUCCESS if the Status bit was found or else ERR_MBX
87 **/
88s32 ixgbe_check_for_msg(struct ixgbe_hw *hw, u16 mbx_id)
89{
90 struct ixgbe_mbx_info *mbx = &hw->mbx;
91 s32 ret_val = IXGBE_ERR_MBX;
92
93 if (mbx->ops.check_for_msg)
94 ret_val = mbx->ops.check_for_msg(hw, mbx_id);
95
96 return ret_val;
97}
98
99/**
100 * ixgbe_check_for_ack - checks to see if someone sent us ACK
101 * @hw: pointer to the HW structure
102 * @mbx_id: id of mailbox to check
103 *
104 * returns SUCCESS if the Status bit was found or else ERR_MBX
105 **/
106s32 ixgbe_check_for_ack(struct ixgbe_hw *hw, u16 mbx_id)
107{
108 struct ixgbe_mbx_info *mbx = &hw->mbx;
109 s32 ret_val = IXGBE_ERR_MBX;
110
111 if (mbx->ops.check_for_ack)
112 ret_val = mbx->ops.check_for_ack(hw, mbx_id);
113
114 return ret_val;
115}
116
117/**
118 * ixgbe_check_for_rst - checks to see if other side has reset
119 * @hw: pointer to the HW structure
120 * @mbx_id: id of mailbox to check
121 *
122 * returns SUCCESS if the Status bit was found or else ERR_MBX
123 **/
124s32 ixgbe_check_for_rst(struct ixgbe_hw *hw, u16 mbx_id)
125{
126 struct ixgbe_mbx_info *mbx = &hw->mbx;
127 s32 ret_val = IXGBE_ERR_MBX;
128
129 if (mbx->ops.check_for_rst)
130 ret_val = mbx->ops.check_for_rst(hw, mbx_id);
131
132 return ret_val;
133}
134
135/**
136 * ixgbe_poll_for_msg - Wait for message notification
137 * @hw: pointer to the HW structure
138 * @mbx_id: id of mailbox to write
139 *
140 * returns SUCCESS if it successfully received a message notification
141 **/
142static s32 ixgbe_poll_for_msg(struct ixgbe_hw *hw, u16 mbx_id)
143{
144 struct ixgbe_mbx_info *mbx = &hw->mbx;
145 int countdown = mbx->timeout;
146
147 if (!countdown || !mbx->ops.check_for_msg)
148 goto out;
149
150 while (countdown && mbx->ops.check_for_msg(hw, mbx_id)) {
151 countdown--;
152 if (!countdown)
153 break;
154 udelay(mbx->usec_delay);
155 }
156
157out:
158 return countdown ? 0 : IXGBE_ERR_MBX;
159}
160
161/**
162 * ixgbe_poll_for_ack - Wait for message acknowledgement
163 * @hw: pointer to the HW structure
164 * @mbx_id: id of mailbox to write
165 *
166 * returns SUCCESS if it successfully received a message acknowledgement
167 **/
168static s32 ixgbe_poll_for_ack(struct ixgbe_hw *hw, u16 mbx_id)
169{
170 struct ixgbe_mbx_info *mbx = &hw->mbx;
171 int countdown = mbx->timeout;
172
173 if (!countdown || !mbx->ops.check_for_ack)
174 goto out;
175
176 while (countdown && mbx->ops.check_for_ack(hw, mbx_id)) {
177 countdown--;
178 if (!countdown)
179 break;
180 udelay(mbx->usec_delay);
181 }
182
183out:
184 return countdown ? 0 : IXGBE_ERR_MBX;
185}
186
187/**
188 * ixgbe_read_posted_mbx - Wait for message notification and receive message
189 * @hw: pointer to the HW structure
190 * @msg: The message buffer
191 * @size: Length of buffer
192 * @mbx_id: id of mailbox to write
193 *
194 * returns SUCCESS if it successfully received a message notification and
195 * copied it into the receive buffer.
196 **/
197static s32 ixgbe_read_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size,
198 u16 mbx_id)
199{
200 struct ixgbe_mbx_info *mbx = &hw->mbx;
201 s32 ret_val = IXGBE_ERR_MBX;
202
203 if (!mbx->ops.read)
204 goto out;
205
206 ret_val = ixgbe_poll_for_msg(hw, mbx_id);
207
208 /* if ack received read message, otherwise we timed out */
209 if (!ret_val)
210 ret_val = mbx->ops.read(hw, msg, size, mbx_id);
211out:
212 return ret_val;
213}
214
215/**
216 * ixgbe_write_posted_mbx - Write a message to the mailbox, wait for ack
217 * @hw: pointer to the HW structure
218 * @msg: The message buffer
219 * @size: Length of buffer
220 * @mbx_id: id of mailbox to write
221 *
222 * returns SUCCESS if it successfully copied message into the buffer and
223 * received an ack to that message within delay * timeout period
224 **/
225static s32 ixgbe_write_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size,
226 u16 mbx_id)
227{
228 struct ixgbe_mbx_info *mbx = &hw->mbx;
229 s32 ret_val = IXGBE_ERR_MBX;
230
231 /* exit if either we can't write or there isn't a defined timeout */
232 if (!mbx->ops.write || !mbx->timeout)
233 goto out;
234
235 /* send msg */
236 ret_val = mbx->ops.write(hw, msg, size, mbx_id);
237
238 /* if msg sent wait until we receive an ack */
239 if (!ret_val)
240 ret_val = ixgbe_poll_for_ack(hw, mbx_id);
241out:
242 return ret_val;
243}
244
245static s32 ixgbe_check_for_bit_pf(struct ixgbe_hw *hw, u32 mask, s32 index)
246{
247 u32 mbvficr = IXGBE_READ_REG(hw, IXGBE_MBVFICR(index));
248 s32 ret_val = IXGBE_ERR_MBX;
249
250 if (mbvficr & mask) {
251 ret_val = 0;
252 IXGBE_WRITE_REG(hw, IXGBE_MBVFICR(index), mask);
253 }
254
255 return ret_val;
256}
257
258/**
259 * ixgbe_check_for_msg_pf - checks to see if the VF has sent mail
260 * @hw: pointer to the HW structure
261 * @vf_number: the VF index
262 *
263 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
264 **/
265static s32 ixgbe_check_for_msg_pf(struct ixgbe_hw *hw, u16 vf_number)
266{
267 s32 ret_val = IXGBE_ERR_MBX;
268 s32 index = IXGBE_MBVFICR_INDEX(vf_number);
269 u32 vf_bit = vf_number % 16;
270
271 if (!ixgbe_check_for_bit_pf(hw, IXGBE_MBVFICR_VFREQ_VF1 << vf_bit,
272 index)) {
273 ret_val = 0;
274 hw->mbx.stats.reqs++;
275 }
276
277 return ret_val;
278}
279
280/**
281 * ixgbe_check_for_ack_pf - checks to see if the VF has ACKed
282 * @hw: pointer to the HW structure
283 * @vf_number: the VF index
284 *
285 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
286 **/
287static s32 ixgbe_check_for_ack_pf(struct ixgbe_hw *hw, u16 vf_number)
288{
289 s32 ret_val = IXGBE_ERR_MBX;
290 s32 index = IXGBE_MBVFICR_INDEX(vf_number);
291 u32 vf_bit = vf_number % 16;
292
293 if (!ixgbe_check_for_bit_pf(hw, IXGBE_MBVFICR_VFACK_VF1 << vf_bit,
294 index)) {
295 ret_val = 0;
296 hw->mbx.stats.acks++;
297 }
298
299 return ret_val;
300}
301
302/**
303 * ixgbe_check_for_rst_pf - checks to see if the VF has reset
304 * @hw: pointer to the HW structure
305 * @vf_number: the VF index
306 *
307 * returns SUCCESS if the VF has set the Status bit or else ERR_MBX
308 **/
309static s32 ixgbe_check_for_rst_pf(struct ixgbe_hw *hw, u16 vf_number)
310{
311 u32 reg_offset = (vf_number < 32) ? 0 : 1;
312 u32 vf_shift = vf_number % 32;
313 u32 vflre = 0;
314 s32 ret_val = IXGBE_ERR_MBX;
315
316 switch (hw->mac.type) {
317 case ixgbe_mac_82599EB:
318 vflre = IXGBE_READ_REG(hw, IXGBE_VFLRE(reg_offset));
319 break;
320 case ixgbe_mac_X540:
321 vflre = IXGBE_READ_REG(hw, IXGBE_VFLREC(reg_offset));
322 break;
323 default:
324 break;
325 }
326
327 if (vflre & (1 << vf_shift)) {
328 ret_val = 0;
329 IXGBE_WRITE_REG(hw, IXGBE_VFLREC(reg_offset), (1 << vf_shift));
330 hw->mbx.stats.rsts++;
331 }
332
333 return ret_val;
334}
335
336/**
337 * ixgbe_obtain_mbx_lock_pf - obtain mailbox lock
338 * @hw: pointer to the HW structure
339 * @vf_number: the VF index
340 *
341 * return SUCCESS if we obtained the mailbox lock
342 **/
343static s32 ixgbe_obtain_mbx_lock_pf(struct ixgbe_hw *hw, u16 vf_number)
344{
345 s32 ret_val = IXGBE_ERR_MBX;
346 u32 p2v_mailbox;
347
348 /* Take ownership of the buffer */
349 IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_PFU);
350
351 /* reserve mailbox for vf use */
352 p2v_mailbox = IXGBE_READ_REG(hw, IXGBE_PFMAILBOX(vf_number));
353 if (p2v_mailbox & IXGBE_PFMAILBOX_PFU)
354 ret_val = 0;
355
356 return ret_val;
357}
358
359/**
360 * ixgbe_write_mbx_pf - Places a message in the mailbox
361 * @hw: pointer to the HW structure
362 * @msg: The message buffer
363 * @size: Length of buffer
364 * @vf_number: the VF index
365 *
366 * returns SUCCESS if it successfully copied message into the buffer
367 **/
368static s32 ixgbe_write_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size,
369 u16 vf_number)
370{
371 s32 ret_val;
372 u16 i;
373
374 /* lock the mailbox to prevent pf/vf race condition */
375 ret_val = ixgbe_obtain_mbx_lock_pf(hw, vf_number);
376 if (ret_val)
377 goto out_no_write;
378
379 /* flush msg and acks as we are overwriting the message buffer */
380 ixgbe_check_for_msg_pf(hw, vf_number);
381 ixgbe_check_for_ack_pf(hw, vf_number);
382
383 /* copy the caller specified message to the mailbox memory buffer */
384 for (i = 0; i < size; i++)
385 IXGBE_WRITE_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_number), i, msg[i]);
386
387 /* Interrupt VF to tell it a message has been sent and release buffer*/
388 IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_STS);
389
390 /* update stats */
391 hw->mbx.stats.msgs_tx++;
392
393out_no_write:
394 return ret_val;
395
396}
397
398/**
399 * ixgbe_read_mbx_pf - Read a message from the mailbox
400 * @hw: pointer to the HW structure
401 * @msg: The message buffer
402 * @size: Length of buffer
403 * @vf_number: the VF index
404 *
405 * This function copies a message from the mailbox buffer to the caller's
406 * memory buffer. The presumption is that the caller knows that there was
407 * a message due to a VF request so no polling for message is needed.
408 **/
409static s32 ixgbe_read_mbx_pf(struct ixgbe_hw *hw, u32 *msg, u16 size,
410 u16 vf_number)
411{
412 s32 ret_val;
413 u16 i;
414
415 /* lock the mailbox to prevent pf/vf race condition */
416 ret_val = ixgbe_obtain_mbx_lock_pf(hw, vf_number);
417 if (ret_val)
418 goto out_no_read;
419
420 /* copy the message to the mailbox memory buffer */
421 for (i = 0; i < size; i++)
422 msg[i] = IXGBE_READ_REG_ARRAY(hw, IXGBE_PFMBMEM(vf_number), i);
423
424 /* Acknowledge the message and release buffer */
425 IXGBE_WRITE_REG(hw, IXGBE_PFMAILBOX(vf_number), IXGBE_PFMAILBOX_ACK);
426
427 /* update stats */
428 hw->mbx.stats.msgs_rx++;
429
430out_no_read:
431 return ret_val;
432}
433
434#ifdef CONFIG_PCI_IOV
435/**
436 * ixgbe_init_mbx_params_pf - set initial values for pf mailbox
437 * @hw: pointer to the HW structure
438 *
439 * Initializes the hw->mbx struct to correct values for pf mailbox
440 */
441void ixgbe_init_mbx_params_pf(struct ixgbe_hw *hw)
442{
443 struct ixgbe_mbx_info *mbx = &hw->mbx;
444
445 if (hw->mac.type != ixgbe_mac_82599EB &&
446 hw->mac.type != ixgbe_mac_X540)
447 return;
448
449 mbx->timeout = 0;
450 mbx->usec_delay = 0;
451
452 mbx->stats.msgs_tx = 0;
453 mbx->stats.msgs_rx = 0;
454 mbx->stats.reqs = 0;
455 mbx->stats.acks = 0;
456 mbx->stats.rsts = 0;
457
458 mbx->size = IXGBE_VFMAILBOX_SIZE;
459}
460#endif /* CONFIG_PCI_IOV */
461
462struct ixgbe_mbx_operations mbx_ops_generic = {
463 .read = ixgbe_read_mbx_pf,
464 .write = ixgbe_write_mbx_pf,
465 .read_posted = ixgbe_read_posted_mbx,
466 .write_posted = ixgbe_write_posted_mbx,
467 .check_for_msg = ixgbe_check_for_msg_pf,
468 .check_for_ack = ixgbe_check_for_ack_pf,
469 .check_for_rst = ixgbe_check_for_rst_pf,
470};
471