tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*******************************************************************************
2
3 Intel 82599 Virtual Function driver
4 Copyright(c) 1999 - 2009 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 "mbx.h"
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 **/
36static 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/**
54 * ixgbevf_poll_for_ack - Wait for message acknowledgement
55 * @hw: pointer to the HW structure
56 *
57 * returns 0 if it successfully received a message acknowledgement
58 **/
59static 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 **/
85static s32 ixgbevf_read_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size)
86{
87 struct ixgbe_mbx_info *mbx = &hw->mbx;
88 s32 ret_val = IXGBE_ERR_MBX;
89
90 ret_val = ixgbevf_poll_for_msg(hw);
91
92 /* if ack received read message, otherwise we timed out */
93 if (!ret_val)
94 ret_val = mbx->ops.read(hw, msg, size);
95
96 return ret_val;
97}
98
99/**
100 * ixgbevf_write_posted_mbx - Write a message to the mailbox, wait for ack
101 * @hw: pointer to the HW structure
102 * @msg: The message buffer
103 * @size: Length of buffer
104 *
105 * returns 0 if it successfully copied message into the buffer and
106 * received an ack to that message within delay * timeout period
107 **/
108static s32 ixgbevf_write_posted_mbx(struct ixgbe_hw *hw, u32 *msg, u16 size)
109{
110 struct ixgbe_mbx_info *mbx = &hw->mbx;
111 s32 ret_val;
112
113 /* send msg */
114 ret_val = mbx->ops.write(hw, msg, size);
115
116 /* if msg sent wait until we receive an ack */
117 if (!ret_val)
118 ret_val = ixgbevf_poll_for_ack(hw);
119
120 return ret_val;
121}
122
123/**
124 * ixgbevf_read_v2p_mailbox - read v2p mailbox
125 * @hw: pointer to the HW structure
126 *
127 * This function is used to read the v2p mailbox without losing the read to
128 * clear status bits.
129 **/
130static u32 ixgbevf_read_v2p_mailbox(struct ixgbe_hw *hw)
131{
132 u32 v2p_mailbox = IXGBE_READ_REG(hw, IXGBE_VFMAILBOX);
133
134 v2p_mailbox |= hw->mbx.v2p_mailbox;
135 hw->mbx.v2p_mailbox |= v2p_mailbox & IXGBE_VFMAILBOX_R2C_BITS;
136
137 return v2p_mailbox;
138}
139
140/**
141 * ixgbevf_check_for_bit_vf - Determine if a status bit was set
142 * @hw: pointer to the HW structure
143 * @mask: bitmask for bits to be tested and cleared
144 *
145 * This function is used to check for the read to clear bits within
146 * the V2P mailbox.
147 **/
148static s32 ixgbevf_check_for_bit_vf(struct ixgbe_hw *hw, u32 mask)
149{
150 u32 v2p_mailbox = ixgbevf_read_v2p_mailbox(hw);
151 s32 ret_val = IXGBE_ERR_MBX;
152
153 if (v2p_mailbox & mask)
154 ret_val = 0;
155
156 hw->mbx.v2p_mailbox &= ~mask;
157
158 return ret_val;
159}
160
161/**
162 * ixgbevf_check_for_msg_vf - checks to see if the PF has sent mail
163 * @hw: pointer to the HW structure
164 *
165 * returns 0 if the PF has set the Status bit or else ERR_MBX
166 **/
167static s32 ixgbevf_check_for_msg_vf(struct ixgbe_hw *hw)
168{
169 s32 ret_val = IXGBE_ERR_MBX;
170
171 if (!ixgbevf_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFSTS)) {
172 ret_val = 0;
173 hw->mbx.stats.reqs++;
174 }
175
176 return ret_val;
177}
178
179/**
180 * ixgbevf_check_for_ack_vf - checks to see if the PF has ACK'd
181 * @hw: pointer to the HW structure
182 *
183 * returns 0 if the PF has set the ACK bit or else ERR_MBX
184 **/
185static s32 ixgbevf_check_for_ack_vf(struct ixgbe_hw *hw)
186{
187 s32 ret_val = IXGBE_ERR_MBX;
188
189 if (!ixgbevf_check_for_bit_vf(hw, IXGBE_VFMAILBOX_PFACK)) {
190 ret_val = 0;
191 hw->mbx.stats.acks++;
192 }
193
194 return ret_val;
195}
196
197/**
198 * ixgbevf_check_for_rst_vf - checks to see if the PF has reset
199 * @hw: pointer to the HW structure
200 *
201 * returns true if the PF has set the reset done bit or else false
202 **/
203static s32 ixgbevf_check_for_rst_vf(struct ixgbe_hw *hw)
204{
205 s32 ret_val = IXGBE_ERR_MBX;
206
207 if (!ixgbevf_check_for_bit_vf(hw, (IXGBE_VFMAILBOX_RSTD |
208 IXGBE_VFMAILBOX_RSTI))) {
209 ret_val = 0;
210 hw->mbx.stats.rsts++;
211 }
212
213 return ret_val;
214}
215
216/**
217 * ixgbevf_obtain_mbx_lock_vf - obtain mailbox lock
218 * @hw: pointer to the HW structure
219 *
220 * return 0 if we obtained the mailbox lock
221 **/
222static s32 ixgbevf_obtain_mbx_lock_vf(struct ixgbe_hw *hw)
223{
224 s32 ret_val = IXGBE_ERR_MBX;
225
226 /* Take ownership of the buffer */
227 IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_VFU);
228
229 /* reserve mailbox for vf use */
230 if (ixgbevf_read_v2p_mailbox(hw) & IXGBE_VFMAILBOX_VFU)
231 ret_val = 0;
232
233 return ret_val;
234}
235
236/**
237 * ixgbevf_write_mbx_vf - Write a message to the mailbox
238 * @hw: pointer to the HW structure
239 * @msg: The message buffer
240 * @size: Length of buffer
241 *
242 * returns 0 if it successfully copied message into the buffer
243 **/
244static s32 ixgbevf_write_mbx_vf(struct ixgbe_hw *hw, u32 *msg, u16 size)
245{
246 s32 ret_val;
247 u16 i;
248
249
250 /* lock the mailbox to prevent pf/vf race condition */
251 ret_val = ixgbevf_obtain_mbx_lock_vf(hw);
252 if (ret_val)
253 goto out_no_write;
254
255 /* flush msg and acks as we are overwriting the message buffer */
256 ixgbevf_check_for_msg_vf(hw);
257 ixgbevf_check_for_ack_vf(hw);
258
259 /* copy the caller specified message to the mailbox memory buffer */
260 for (i = 0; i < size; i++)
261 IXGBE_WRITE_REG_ARRAY(hw, IXGBE_VFMBMEM, i, msg[i]);
262
263 /* update stats */
264 hw->mbx.stats.msgs_tx++;
265
266 /* Drop VFU and interrupt the PF to tell it a message has been sent */
267 IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_REQ);
268
269out_no_write:
270 return ret_val;
271}
272
273/**
274 * ixgbevf_read_mbx_vf - Reads a message from the inbox intended for vf
275 * @hw: pointer to the HW structure
276 * @msg: The message buffer
277 * @size: Length of buffer
278 *
279 * returns 0 if it successfuly read message from buffer
280 **/
281static s32 ixgbevf_read_mbx_vf(struct ixgbe_hw *hw, u32 *msg, u16 size)
282{
283 s32 ret_val = 0;
284 u16 i;
285
286 /* lock the mailbox to prevent pf/vf race condition */
287 ret_val = ixgbevf_obtain_mbx_lock_vf(hw);
288 if (ret_val)
289 goto out_no_read;
290
291 /* copy the message from the mailbox memory buffer */
292 for (i = 0; i < size; i++)
293 msg[i] = IXGBE_READ_REG_ARRAY(hw, IXGBE_VFMBMEM, i);
294
295 /* Acknowledge receipt and release mailbox, then we're done */
296 IXGBE_WRITE_REG(hw, IXGBE_VFMAILBOX, IXGBE_VFMAILBOX_ACK);
297
298 /* update stats */
299 hw->mbx.stats.msgs_rx++;
300
301out_no_read:
302 return ret_val;
303}
304
305/**
306 * ixgbevf_init_mbx_params_vf - set initial values for vf mailbox
307 * @hw: pointer to the HW structure
308 *
309 * Initializes the hw->mbx struct to correct values for vf mailbox
310 */
311s32 ixgbevf_init_mbx_params_vf(struct ixgbe_hw *hw)
312{
313 struct ixgbe_mbx_info *mbx = &hw->mbx;
314
315 /* start mailbox as timed out and let the reset_hw call set the timeout
316 * value to begin communications */
317 mbx->timeout = 0;
318 mbx->udelay = IXGBE_VF_MBX_INIT_DELAY;
319
320 mbx->size = IXGBE_VFMAILBOX_SIZE;
321
322 mbx->stats.msgs_tx = 0;
323 mbx->stats.msgs_rx = 0;
324 mbx->stats.reqs = 0;
325 mbx->stats.acks = 0;
326 mbx->stats.rsts = 0;
327
328 return 0;
329}
330
331struct ixgbe_mbx_operations ixgbevf_mbx_ops = {
332 .init_params = ixgbevf_init_mbx_params_vf,
333 .read = ixgbevf_read_mbx_vf,
334 .write = ixgbevf_write_mbx_vf,
335 .read_posted = ixgbevf_read_posted_mbx,
336 .write_posted = ixgbevf_write_posted_mbx,
337 .check_for_msg = ixgbevf_check_for_msg_vf,
338 .check_for_ack = ixgbevf_check_for_ack_vf,
339 .check_for_rst = ixgbevf_check_for_rst_vf,
340};
341