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cbf698db GR |
1 | /******************************************************************************* |
2 | ||
3 | Intel 82599 Virtual Function driver | |
dec0d8e4 | 4 | Copyright(c) 1999 - 2015 Intel Corporation. |
cbf698db GR |
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 | |
dec0d8e4 | 16 | this program; if not, see <http://www.gnu.org/licenses/>. |
cbf698db GR |
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 "mbx.h" | |
b5417bf8 | 28 | #include "ixgbevf.h" |
cbf698db GR |
29 | |
30 | /** | |
31 | * ixgbevf_poll_for_msg - Wait for message notification | |
32 | * @hw: pointer to the HW structure | |
33 | * | |
34 | * returns 0 if it successfully received a message notification | |
35 | **/ | |
36 | static s32 ixgbevf_poll_for_msg(struct ixgbe_hw *hw) | |
37 | { | |
38 | struct ixgbe_mbx_info *mbx = &hw->mbx; | |
39 | int countdown = mbx->timeout; | |
40 | ||
41 | while (countdown && mbx->ops.check_for_msg(hw)) { | |
42 | countdown--; | |
43 | udelay(mbx->udelay); | |
44 | } | |
45 | ||
46 | /* if we failed, all future posted messages fail until reset */ | |
47 | if (!countdown) | |
48 | mbx->timeout = 0; | |
49 | ||
50 | return countdown ? 0 : IXGBE_ERR_MBX; | |
51 | } | |
52 | ||
53 | /** | |
dec0d8e4 | 54 | * ixgbevf_poll_for_ack - Wait for message acknowledgment |
cbf698db GR |
55 | * @hw: pointer to the HW structure |
56 | * | |
dec0d8e4 | 57 | * returns 0 if it successfully received a message acknowledgment |
cbf698db GR |
58 | **/ |
59 | static s32 ixgbevf_poll_for_ack(struct ixgbe_hw *hw) | |
60 | { | |
61 | struct ixgbe_mbx_info *mbx = &hw->mbx; | |
62 | int countdown = mbx->timeout; | |
63 | ||
64 | while (countdown && mbx->ops.check_for_ack(hw)) { | |
65 | countdown--; | |
66 | udelay(mbx->udelay); | |
67 | } | |
68 | ||
69 | /* if we failed, all future posted messages fail until reset */ | |
70 | if (!countdown) | |
71 | mbx->timeout = 0; | |
72 | ||
73 | return countdown ? 0 : IXGBE_ERR_MBX; | |
74 | } | |
75 | ||
76 | /** | |
77 | * ixgbevf_read_posted_mbx - Wait for message notification and receive message | |
78 | * @hw: pointer to the HW structure | |
79 | * @msg: The message buffer | |
80 | * @size: Length of buffer | |
81 | * | |
82 | * returns 0 if it successfully received a message notification and | |
83 | * copied it into the receive buffer. | |
84 | **/ | |
85 | static s32 ixgbevf_read_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size) | |
86 | { | |
87 | struct ixgbe_mbx_info *mbx = &hw->mbx; | |
b3a3c517 | 88 | s32 ret_val = IXGBE_ERR_MBX; |
4b2cd27f AD |
89 | |
90 | if (!mbx->ops.read) | |
91 | goto out; | |
cbf698db GR |
92 | |
93 | ret_val = ixgbevf_poll_for_msg(hw); | |
94 | ||
95 | /* if ack received read message, otherwise we timed out */ | |
96 | if (!ret_val) | |
97 | ret_val = mbx->ops.read(hw, msg, size); | |
4b2cd27f | 98 | out: |
cbf698db GR |
99 | return ret_val; |
100 | } | |
101 | ||
102 | /** | |
103 | * ixgbevf_write_posted_mbx - Write a message to the mailbox, wait for ack | |
104 | * @hw: pointer to the HW structure | |
105 | * @msg: The message buffer | |
106 | * @size: Length of buffer | |
107 | * | |
108 | * returns 0 if it successfully copied message into the buffer and | |
109 | * received an ack to that message within delay * timeout period | |
110 | **/ | |
111 | static s32 ixgbevf_write_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size) | |
112 | { | |
113 | struct ixgbe_mbx_info *mbx = &hw->mbx; | |
b3a3c517 | 114 | s32 ret_val = IXGBE_ERR_MBX; |
4b2cd27f AD |
115 | |
116 | /* exit if either we can't write or there isn't a defined timeout */ | |
117 | if (!mbx->ops.write || !mbx->timeout) | |
118 | goto out; | |
cbf698db GR |
119 | |
120 | /* send msg */ | |
121 | ret_val = mbx->ops.write(hw, msg, size); | |
122 | ||
123 | /* if msg sent wait until we receive an ack */ | |
124 | if (!ret_val) | |
125 | ret_val = ixgbevf_poll_for_ack(hw); | |
4b2cd27f | 126 | out: |
cbf698db GR |
127 | return ret_val; |
128 | } | |
129 | ||
130 | /** | |
131 | * ixgbevf_read_v2p_mailbox - read v2p mailbox | |
132 | * @hw: pointer to the HW structure | |
133 | * | |
134 | * This function is used to read the v2p mailbox without losing the read to | |
135 | * clear status bits. | |
136 | **/ | |
137 | static u32 ixgbevf_read_v2p_mailbox(struct ixgbe_hw *hw) | |
138 | { | |
139 | u32 v2p_mailbox = IXGBE_READ_REG(hw, IXGBE_VFMAILBOX); | |
140 | ||
141 | v2p_mailbox |= hw->mbx.v2p_mailbox; | |
142 | hw->mbx.v2p_mailbox |= v2p_mailbox & IXGBE_VFMAILBOX_R2C_BITS; | |
143 | ||
144 | return v2p_mailbox; | |
145 | } | |
146 | ||
147 | /** | |
148 | * ixgbevf_check_for_bit_vf - Determine if a status bit was set | |
149 | * @hw: pointer to the HW structure | |
150 | * @mask: bitmask for bits to be tested and cleared | |
151 | * | |
152 | * This function is used to check for the read to clear bits within | |
153 | * the V2P mailbox. | |
154 | **/ | |
155 | static s32 ixgbevf_check_for_bit_vf(struct ixgbe_hw *hw, u32 mask) | |
156 | { | |
157 | u32 v2p_mailbox = ixgbevf_read_v2p_mailbox(hw); | |
158 | s32 ret_val = IXGBE_ERR_MBX; | |
159 | ||
160 | if (v2p_mailbox & mask) | |
161 | ret_val = 0; | |
162 | ||
163 | hw->mbx.v2p_mailbox &= ~mask; | |
164 | ||
165 | return ret_val; | |
166 | } | |
167 | ||
168 | /** | |
169 | * ixgbevf_check_for_msg_vf - checks to see if the PF has sent mail | |
170 | * @hw: pointer to the HW structure | |
171 | * | |
172 | * returns 0 if the PF has set the Status bit or else ERR_MBX | |
173 | **/ | |
174 | static s32 ixgbevf_check_for_msg_vf(struct ixgbe_hw *hw) | |
175 | { | |
176 | s32 ret_val = IXGBE_ERR_MBX; | |
177 | ||
178 | if (!ixgbevf_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFSTS)) { | |
179 | ret_val = 0; | |
180 | hw->mbx.stats.reqs++; | |
181 | } | |
182 | ||
183 | return ret_val; | |
184 | } | |
185 | ||
186 | /** | |
187 | * ixgbevf_check_for_ack_vf - checks to see if the PF has ACK'd | |
188 | * @hw: pointer to the HW structure | |
189 | * | |
190 | * returns 0 if the PF has set the ACK bit or else ERR_MBX | |
191 | **/ | |
192 | static s32 ixgbevf_check_for_ack_vf(struct ixgbe_hw *hw) | |
193 | { | |
194 | s32 ret_val = IXGBE_ERR_MBX; | |
195 | ||
196 | if (!ixgbevf_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFACK)) { | |
197 | ret_val = 0; | |
198 | hw->mbx.stats.acks++; | |
199 | } | |
200 | ||
201 | return ret_val; | |
202 | } | |
203 | ||
204 | /** | |
205 | * ixgbevf_check_for_rst_vf - checks to see if the PF has reset | |
206 | * @hw: pointer to the HW structure | |
207 | * | |
208 | * returns true if the PF has set the reset done bit or else false | |
209 | **/ | |
210 | static s32 ixgbevf_check_for_rst_vf(struct ixgbe_hw *hw) | |
211 | { | |
212 | s32 ret_val = IXGBE_ERR_MBX; | |
213 | ||
214 | if (!ixgbevf_check_for_bit_vf(hw, (IXGBE_VFMAILBOX_RSTD | | |
dec0d8e4 | 215 | IXGBE_VFMAILBOX_RSTI))) { |
cbf698db GR |
216 | ret_val = 0; |
217 | hw->mbx.stats.rsts++; | |
218 | } | |
219 | ||
220 | return ret_val; | |
221 | } | |
222 | ||
223 | /** | |
224 | * ixgbevf_obtain_mbx_lock_vf - obtain mailbox lock | |
225 | * @hw: pointer to the HW structure | |
226 | * | |
227 | * return 0 if we obtained the mailbox lock | |
228 | **/ | |
229 | static s32 ixgbevf_obtain_mbx_lock_vf(struct ixgbe_hw *hw) | |
230 | { | |
231 | s32 ret_val = IXGBE_ERR_MBX; | |
232 | ||
233 | /* Take ownership of the buffer */ | |
234 | IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_VFU); | |
235 | ||
dec0d8e4 | 236 | /* reserve mailbox for VF use */ |
cbf698db GR |
237 | if (ixgbevf_read_v2p_mailbox(hw) & IXGBE_VFMAILBOX_VFU) |
238 | ret_val = 0; | |
239 | ||
240 | return ret_val; | |
241 | } | |
242 | ||
243 | /** | |
244 | * ixgbevf_write_mbx_vf - Write a message to the mailbox | |
245 | * @hw: pointer to the HW structure | |
246 | * @msg: The message buffer | |
247 | * @size: Length of buffer | |
248 | * | |
249 | * returns 0 if it successfully copied message into the buffer | |
250 | **/ | |
251 | static s32 ixgbevf_write_mbx_vf(struct ixgbe_hw *hw, u32 *msg, u16 size) | |
252 | { | |
253 | s32 ret_val; | |
254 | u16 i; | |
255 | ||
dec0d8e4 | 256 | /* lock the mailbox to prevent PF/VF race condition */ |
cbf698db GR |
257 | ret_val = ixgbevf_obtain_mbx_lock_vf(hw); |
258 | if (ret_val) | |
259 | goto out_no_write; | |
260 | ||
261 | /* flush msg and acks as we are overwriting the message buffer */ | |
262 | ixgbevf_check_for_msg_vf(hw); | |
263 | ixgbevf_check_for_ack_vf(hw); | |
264 | ||
265 | /* copy the caller specified message to the mailbox memory buffer */ | |
266 | for (i = 0; i < size; i++) | |
267 | IXGBE_WRITE_REG_ARRAY(hw, IXGBE_VFMBMEM, i, msg[i]); | |
268 | ||
269 | /* update stats */ | |
270 | hw->mbx.stats.msgs_tx++; | |
271 | ||
272 | /* Drop VFU and interrupt the PF to tell it a message has been sent */ | |
273 | IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_REQ); | |
274 | ||
275 | out_no_write: | |
276 | return ret_val; | |
277 | } | |
278 | ||
279 | /** | |
dec0d8e4 | 280 | * ixgbevf_read_mbx_vf - Reads a message from the inbox intended for VF |
cbf698db GR |
281 | * @hw: pointer to the HW structure |
282 | * @msg: The message buffer | |
283 | * @size: Length of buffer | |
284 | * | |
bfb9035c | 285 | * returns 0 if it successfully read message from buffer |
cbf698db GR |
286 | **/ |
287 | static s32 ixgbevf_read_mbx_vf(struct ixgbe_hw *hw, u32 *msg, u16 size) | |
288 | { | |
289 | s32 ret_val = 0; | |
290 | u16 i; | |
291 | ||
dec0d8e4 | 292 | /* lock the mailbox to prevent PF/VF race condition */ |
cbf698db GR |
293 | ret_val = ixgbevf_obtain_mbx_lock_vf(hw); |
294 | if (ret_val) | |
295 | goto out_no_read; | |
296 | ||
297 | /* copy the message from the mailbox memory buffer */ | |
298 | for (i = 0; i < size; i++) | |
299 | msg[i] = IXGBE_READ_REG_ARRAY(hw, IXGBE_VFMBMEM, i); | |
300 | ||
301 | /* Acknowledge receipt and release mailbox, then we're done */ | |
302 | IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_ACK); | |
303 | ||
304 | /* update stats */ | |
305 | hw->mbx.stats.msgs_rx++; | |
306 | ||
307 | out_no_read: | |
308 | return ret_val; | |
309 | } | |
310 | ||
311 | /** | |
dec0d8e4 | 312 | * ixgbevf_init_mbx_params_vf - set initial values for VF mailbox |
cbf698db GR |
313 | * @hw: pointer to the HW structure |
314 | * | |
dec0d8e4 | 315 | * Initializes the hw->mbx struct to correct values for VF mailbox |
cbf698db | 316 | */ |
9ed51657 | 317 | static s32 ixgbevf_init_mbx_params_vf(struct ixgbe_hw *hw) |
cbf698db GR |
318 | { |
319 | struct ixgbe_mbx_info *mbx = &hw->mbx; | |
320 | ||
321 | /* start mailbox as timed out and let the reset_hw call set the timeout | |
dec0d8e4 JK |
322 | * value to begin communications |
323 | */ | |
cbf698db GR |
324 | mbx->timeout = 0; |
325 | mbx->udelay = IXGBE_VF_MBX_INIT_DELAY; | |
326 | ||
327 | mbx->size = IXGBE_VFMAILBOX_SIZE; | |
328 | ||
329 | mbx->stats.msgs_tx = 0; | |
330 | mbx->stats.msgs_rx = 0; | |
331 | mbx->stats.reqs = 0; | |
332 | mbx->stats.acks = 0; | |
333 | mbx->stats.rsts = 0; | |
334 | ||
335 | return 0; | |
336 | } | |
337 | ||
b5417bf8 | 338 | const struct ixgbe_mbx_operations ixgbevf_mbx_ops = { |
dec0d8e4 JK |
339 | .init_params = ixgbevf_init_mbx_params_vf, |
340 | .read = ixgbevf_read_mbx_vf, | |
341 | .write = ixgbevf_write_mbx_vf, | |
342 | .read_posted = ixgbevf_read_posted_mbx, | |
343 | .write_posted = ixgbevf_write_posted_mbx, | |
344 | .check_for_msg = ixgbevf_check_for_msg_vf, | |
345 | .check_for_ack = ixgbevf_check_for_ack_vf, | |
346 | .check_for_rst = ixgbevf_check_for_rst_vf, | |
cbf698db GR |
347 | }; |
348 | ||
c6d45171 KS |
349 | /* Mailbox operations when running on Hyper-V. |
350 | * On Hyper-V, PF/VF communication is not through the | |
351 | * hardware mailbox; this communication is through | |
352 | * a software mediated path. | |
353 | * Most mail box operations are noop while running on | |
354 | * Hyper-V. | |
355 | */ | |
356 | const struct ixgbe_mbx_operations ixgbevf_hv_mbx_ops = { | |
357 | .init_params = ixgbevf_init_mbx_params_vf, | |
358 | .check_for_rst = ixgbevf_check_for_rst_vf, | |
359 | }; |