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cbf698db GR |
1 | /******************************************************************************* |
2 | ||
3 | Intel 82599 Virtual Function driver | |
5c47a2b6 | 4 | Copyright(c) 1999 - 2012 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 | |
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 "mbx.h" | |
b5417bf8 | 29 | #include "ixgbevf.h" |
cbf698db GR |
30 | |
31 | /** | |
32 | * ixgbevf_poll_for_msg - Wait for message notification | |
33 | * @hw: pointer to the HW structure | |
34 | * | |
35 | * returns 0 if it successfully received a message notification | |
36 | **/ | |
37 | static s32 ixgbevf_poll_for_msg(struct ixgbe_hw *hw) | |
38 | { | |
39 | struct ixgbe_mbx_info *mbx = &hw->mbx; | |
40 | int countdown = mbx->timeout; | |
41 | ||
42 | while (countdown && mbx->ops.check_for_msg(hw)) { | |
43 | countdown--; | |
44 | udelay(mbx->udelay); | |
45 | } | |
46 | ||
47 | /* if we failed, all future posted messages fail until reset */ | |
48 | if (!countdown) | |
49 | mbx->timeout = 0; | |
50 | ||
51 | return countdown ? 0 : IXGBE_ERR_MBX; | |
52 | } | |
53 | ||
54 | /** | |
55 | * ixgbevf_poll_for_ack - Wait for message acknowledgement | |
56 | * @hw: pointer to the HW structure | |
57 | * | |
58 | * returns 0 if it successfully received a message acknowledgement | |
59 | **/ | |
60 | static s32 ixgbevf_poll_for_ack(struct ixgbe_hw *hw) | |
61 | { | |
62 | struct ixgbe_mbx_info *mbx = &hw->mbx; | |
63 | int countdown = mbx->timeout; | |
64 | ||
65 | while (countdown && mbx->ops.check_for_ack(hw)) { | |
66 | countdown--; | |
67 | udelay(mbx->udelay); | |
68 | } | |
69 | ||
70 | /* if we failed, all future posted messages fail until reset */ | |
71 | if (!countdown) | |
72 | mbx->timeout = 0; | |
73 | ||
74 | return countdown ? 0 : IXGBE_ERR_MBX; | |
75 | } | |
76 | ||
77 | /** | |
78 | * ixgbevf_read_posted_mbx - Wait for message notification and receive message | |
79 | * @hw: pointer to the HW structure | |
80 | * @msg: The message buffer | |
81 | * @size: Length of buffer | |
82 | * | |
83 | * returns 0 if it successfully received a message notification and | |
84 | * copied it into the receive buffer. | |
85 | **/ | |
86 | static s32 ixgbevf_read_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size) | |
87 | { | |
88 | struct ixgbe_mbx_info *mbx = &hw->mbx; | |
4b2cd27f AD |
89 | s32 ret_val = -IXGBE_ERR_MBX; |
90 | ||
91 | if (!mbx->ops.read) | |
92 | goto out; | |
cbf698db GR |
93 | |
94 | ret_val = ixgbevf_poll_for_msg(hw); | |
95 | ||
96 | /* if ack received read message, otherwise we timed out */ | |
97 | if (!ret_val) | |
98 | ret_val = mbx->ops.read(hw, msg, size); | |
4b2cd27f | 99 | out: |
cbf698db GR |
100 | return ret_val; |
101 | } | |
102 | ||
103 | /** | |
104 | * ixgbevf_write_posted_mbx - Write a message to the mailbox, wait for ack | |
105 | * @hw: pointer to the HW structure | |
106 | * @msg: The message buffer | |
107 | * @size: Length of buffer | |
108 | * | |
109 | * returns 0 if it successfully copied message into the buffer and | |
110 | * received an ack to that message within delay * timeout period | |
111 | **/ | |
112 | static s32 ixgbevf_write_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size) | |
113 | { | |
114 | struct ixgbe_mbx_info *mbx = &hw->mbx; | |
4b2cd27f AD |
115 | s32 ret_val = -IXGBE_ERR_MBX; |
116 | ||
117 | /* exit if either we can't write or there isn't a defined timeout */ | |
118 | if (!mbx->ops.write || !mbx->timeout) | |
119 | goto out; | |
cbf698db GR |
120 | |
121 | /* send msg */ | |
122 | ret_val = mbx->ops.write(hw, msg, size); | |
123 | ||
124 | /* if msg sent wait until we receive an ack */ | |
125 | if (!ret_val) | |
126 | ret_val = ixgbevf_poll_for_ack(hw); | |
4b2cd27f | 127 | out: |
cbf698db GR |
128 | return ret_val; |
129 | } | |
130 | ||
131 | /** | |
132 | * ixgbevf_read_v2p_mailbox - read v2p mailbox | |
133 | * @hw: pointer to the HW structure | |
134 | * | |
135 | * This function is used to read the v2p mailbox without losing the read to | |
136 | * clear status bits. | |
137 | **/ | |
138 | static u32 ixgbevf_read_v2p_mailbox(struct ixgbe_hw *hw) | |
139 | { | |
140 | u32 v2p_mailbox = IXGBE_READ_REG(hw, IXGBE_VFMAILBOX); | |
141 | ||
142 | v2p_mailbox |= hw->mbx.v2p_mailbox; | |
143 | hw->mbx.v2p_mailbox |= v2p_mailbox & IXGBE_VFMAILBOX_R2C_BITS; | |
144 | ||
145 | return v2p_mailbox; | |
146 | } | |
147 | ||
148 | /** | |
149 | * ixgbevf_check_for_bit_vf - Determine if a status bit was set | |
150 | * @hw: pointer to the HW structure | |
151 | * @mask: bitmask for bits to be tested and cleared | |
152 | * | |
153 | * This function is used to check for the read to clear bits within | |
154 | * the V2P mailbox. | |
155 | **/ | |
156 | static s32 ixgbevf_check_for_bit_vf(struct ixgbe_hw *hw, u32 mask) | |
157 | { | |
158 | u32 v2p_mailbox = ixgbevf_read_v2p_mailbox(hw); | |
159 | s32 ret_val = IXGBE_ERR_MBX; | |
160 | ||
161 | if (v2p_mailbox & mask) | |
162 | ret_val = 0; | |
163 | ||
164 | hw->mbx.v2p_mailbox &= ~mask; | |
165 | ||
166 | return ret_val; | |
167 | } | |
168 | ||
169 | /** | |
170 | * ixgbevf_check_for_msg_vf - checks to see if the PF has sent mail | |
171 | * @hw: pointer to the HW structure | |
172 | * | |
173 | * returns 0 if the PF has set the Status bit or else ERR_MBX | |
174 | **/ | |
175 | static s32 ixgbevf_check_for_msg_vf(struct ixgbe_hw *hw) | |
176 | { | |
177 | s32 ret_val = IXGBE_ERR_MBX; | |
178 | ||
179 | if (!ixgbevf_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFSTS)) { | |
180 | ret_val = 0; | |
181 | hw->mbx.stats.reqs++; | |
182 | } | |
183 | ||
184 | return ret_val; | |
185 | } | |
186 | ||
187 | /** | |
188 | * ixgbevf_check_for_ack_vf - checks to see if the PF has ACK'd | |
189 | * @hw: pointer to the HW structure | |
190 | * | |
191 | * returns 0 if the PF has set the ACK bit or else ERR_MBX | |
192 | **/ | |
193 | static s32 ixgbevf_check_for_ack_vf(struct ixgbe_hw *hw) | |
194 | { | |
195 | s32 ret_val = IXGBE_ERR_MBX; | |
196 | ||
197 | if (!ixgbevf_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFACK)) { | |
198 | ret_val = 0; | |
199 | hw->mbx.stats.acks++; | |
200 | } | |
201 | ||
202 | return ret_val; | |
203 | } | |
204 | ||
205 | /** | |
206 | * ixgbevf_check_for_rst_vf - checks to see if the PF has reset | |
207 | * @hw: pointer to the HW structure | |
208 | * | |
209 | * returns true if the PF has set the reset done bit or else false | |
210 | **/ | |
211 | static s32 ixgbevf_check_for_rst_vf(struct ixgbe_hw *hw) | |
212 | { | |
213 | s32 ret_val = IXGBE_ERR_MBX; | |
214 | ||
215 | if (!ixgbevf_check_for_bit_vf(hw, (IXGBE_VFMAILBOX_RSTD | | |
216 | IXGBE_VFMAILBOX_RSTI))) { | |
217 | ret_val = 0; | |
218 | hw->mbx.stats.rsts++; | |
219 | } | |
220 | ||
221 | return ret_val; | |
222 | } | |
223 | ||
224 | /** | |
225 | * ixgbevf_obtain_mbx_lock_vf - obtain mailbox lock | |
226 | * @hw: pointer to the HW structure | |
227 | * | |
228 | * return 0 if we obtained the mailbox lock | |
229 | **/ | |
230 | static s32 ixgbevf_obtain_mbx_lock_vf(struct ixgbe_hw *hw) | |
231 | { | |
232 | s32 ret_val = IXGBE_ERR_MBX; | |
233 | ||
234 | /* Take ownership of the buffer */ | |
235 | IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_VFU); | |
236 | ||
237 | /* reserve mailbox for vf use */ | |
238 | if (ixgbevf_read_v2p_mailbox(hw) & IXGBE_VFMAILBOX_VFU) | |
239 | ret_val = 0; | |
240 | ||
241 | return ret_val; | |
242 | } | |
243 | ||
244 | /** | |
245 | * ixgbevf_write_mbx_vf - Write a message to the mailbox | |
246 | * @hw: pointer to the HW structure | |
247 | * @msg: The message buffer | |
248 | * @size: Length of buffer | |
249 | * | |
250 | * returns 0 if it successfully copied message into the buffer | |
251 | **/ | |
252 | static s32 ixgbevf_write_mbx_vf(struct ixgbe_hw *hw, u32 *msg, u16 size) | |
253 | { | |
254 | s32 ret_val; | |
255 | u16 i; | |
256 | ||
257 | ||
258 | /* lock the mailbox to prevent pf/vf race condition */ | |
259 | ret_val = ixgbevf_obtain_mbx_lock_vf(hw); | |
260 | if (ret_val) | |
261 | goto out_no_write; | |
262 | ||
263 | /* flush msg and acks as we are overwriting the message buffer */ | |
264 | ixgbevf_check_for_msg_vf(hw); | |
265 | ixgbevf_check_for_ack_vf(hw); | |
266 | ||
267 | /* copy the caller specified message to the mailbox memory buffer */ | |
268 | for (i = 0; i < size; i++) | |
269 | IXGBE_WRITE_REG_ARRAY(hw, IXGBE_VFMBMEM, i, msg[i]); | |
270 | ||
271 | /* update stats */ | |
272 | hw->mbx.stats.msgs_tx++; | |
273 | ||
274 | /* Drop VFU and interrupt the PF to tell it a message has been sent */ | |
275 | IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_REQ); | |
276 | ||
277 | out_no_write: | |
278 | return ret_val; | |
279 | } | |
280 | ||
281 | /** | |
282 | * ixgbevf_read_mbx_vf - Reads a message from the inbox intended for vf | |
283 | * @hw: pointer to the HW structure | |
284 | * @msg: The message buffer | |
285 | * @size: Length of buffer | |
286 | * | |
bfb9035c | 287 | * returns 0 if it successfully read message from buffer |
cbf698db GR |
288 | **/ |
289 | static s32 ixgbevf_read_mbx_vf(struct ixgbe_hw *hw, u32 *msg, u16 size) | |
290 | { | |
291 | s32 ret_val = 0; | |
292 | u16 i; | |
293 | ||
294 | /* lock the mailbox to prevent pf/vf race condition */ | |
295 | ret_val = ixgbevf_obtain_mbx_lock_vf(hw); | |
296 | if (ret_val) | |
297 | goto out_no_read; | |
298 | ||
299 | /* copy the message from the mailbox memory buffer */ | |
300 | for (i = 0; i < size; i++) | |
301 | msg[i] = IXGBE_READ_REG_ARRAY(hw, IXGBE_VFMBMEM, i); | |
302 | ||
303 | /* Acknowledge receipt and release mailbox, then we're done */ | |
304 | IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_ACK); | |
305 | ||
306 | /* update stats */ | |
307 | hw->mbx.stats.msgs_rx++; | |
308 | ||
309 | out_no_read: | |
310 | return ret_val; | |
311 | } | |
312 | ||
313 | /** | |
314 | * ixgbevf_init_mbx_params_vf - set initial values for vf mailbox | |
315 | * @hw: pointer to the HW structure | |
316 | * | |
317 | * Initializes the hw->mbx struct to correct values for vf mailbox | |
318 | */ | |
9ed51657 | 319 | static s32 ixgbevf_init_mbx_params_vf(struct ixgbe_hw *hw) |
cbf698db GR |
320 | { |
321 | struct ixgbe_mbx_info *mbx = &hw->mbx; | |
322 | ||
323 | /* start mailbox as timed out and let the reset_hw call set the timeout | |
324 | * value to begin communications */ | |
325 | mbx->timeout = 0; | |
326 | mbx->udelay = IXGBE_VF_MBX_INIT_DELAY; | |
327 | ||
328 | mbx->size = IXGBE_VFMAILBOX_SIZE; | |
329 | ||
330 | mbx->stats.msgs_tx = 0; | |
331 | mbx->stats.msgs_rx = 0; | |
332 | mbx->stats.reqs = 0; | |
333 | mbx->stats.acks = 0; | |
334 | mbx->stats.rsts = 0; | |
335 | ||
336 | return 0; | |
337 | } | |
338 | ||
b5417bf8 | 339 | const struct ixgbe_mbx_operations ixgbevf_mbx_ops = { |
cbf698db GR |
340 | .init_params = ixgbevf_init_mbx_params_vf, |
341 | .read = ixgbevf_read_mbx_vf, | |
342 | .write = ixgbevf_write_mbx_vf, | |
343 | .read_posted = ixgbevf_read_posted_mbx, | |
344 | .write_posted = ixgbevf_write_posted_mbx, | |
345 | .check_for_msg = ixgbevf_check_for_msg_vf, | |
346 | .check_for_ack = ixgbevf_check_for_ack_vf, | |
347 | .check_for_rst = ixgbevf_check_for_rst_vf, | |
348 | }; | |
349 |