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1 | /******************************************************************************* |
2 | ||
3 | Intel(R) 82576 Virtual Function Linux driver | |
4 | Copyright(c) 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 | ||
29 | #include "vf.h" | |
30 | ||
31 | static s32 e1000_check_for_link_vf(struct e1000_hw *hw); | |
32 | static s32 e1000_get_link_up_info_vf(struct e1000_hw *hw, u16 *speed, | |
33 | u16 *duplex); | |
34 | static s32 e1000_init_hw_vf(struct e1000_hw *hw); | |
35 | static s32 e1000_reset_hw_vf(struct e1000_hw *hw); | |
36 | ||
37 | static void e1000_update_mc_addr_list_vf(struct e1000_hw *hw, u8 *, | |
38 | u32, u32, u32); | |
39 | static void e1000_rar_set_vf(struct e1000_hw *, u8 *, u32); | |
40 | static s32 e1000_read_mac_addr_vf(struct e1000_hw *); | |
41 | static s32 e1000_set_vfta_vf(struct e1000_hw *, u16, bool); | |
42 | ||
43 | /** | |
44 | * e1000_init_mac_params_vf - Inits MAC params | |
45 | * @hw: pointer to the HW structure | |
46 | **/ | |
47 | s32 e1000_init_mac_params_vf(struct e1000_hw *hw) | |
48 | { | |
49 | struct e1000_mac_info *mac = &hw->mac; | |
50 | ||
51 | /* VF's have no MTA Registers - PF feature only */ | |
52 | mac->mta_reg_count = 128; | |
53 | /* VF's have no access to RAR entries */ | |
54 | mac->rar_entry_count = 1; | |
55 | ||
56 | /* Function pointers */ | |
57 | /* reset */ | |
58 | mac->ops.reset_hw = e1000_reset_hw_vf; | |
59 | /* hw initialization */ | |
60 | mac->ops.init_hw = e1000_init_hw_vf; | |
61 | /* check for link */ | |
62 | mac->ops.check_for_link = e1000_check_for_link_vf; | |
63 | /* link info */ | |
64 | mac->ops.get_link_up_info = e1000_get_link_up_info_vf; | |
65 | /* multicast address update */ | |
66 | mac->ops.update_mc_addr_list = e1000_update_mc_addr_list_vf; | |
67 | /* set mac address */ | |
68 | mac->ops.rar_set = e1000_rar_set_vf; | |
69 | /* read mac address */ | |
70 | mac->ops.read_mac_addr = e1000_read_mac_addr_vf; | |
71 | /* set vlan filter table array */ | |
72 | mac->ops.set_vfta = e1000_set_vfta_vf; | |
73 | ||
74 | return E1000_SUCCESS; | |
75 | } | |
76 | ||
77 | /** | |
78 | * e1000_init_function_pointers_vf - Inits function pointers | |
79 | * @hw: pointer to the HW structure | |
80 | **/ | |
81 | void e1000_init_function_pointers_vf(struct e1000_hw *hw) | |
82 | { | |
83 | hw->mac.ops.init_params = e1000_init_mac_params_vf; | |
84 | hw->mbx.ops.init_params = e1000_init_mbx_params_vf; | |
85 | } | |
86 | ||
87 | /** | |
88 | * e1000_get_link_up_info_vf - Gets link info. | |
89 | * @hw: pointer to the HW structure | |
90 | * @speed: pointer to 16 bit value to store link speed. | |
91 | * @duplex: pointer to 16 bit value to store duplex. | |
92 | * | |
93 | * Since we cannot read the PHY and get accurate link info, we must rely upon | |
94 | * the status register's data which is often stale and inaccurate. | |
95 | **/ | |
96 | static s32 e1000_get_link_up_info_vf(struct e1000_hw *hw, u16 *speed, | |
97 | u16 *duplex) | |
98 | { | |
99 | s32 status; | |
100 | ||
101 | status = er32(STATUS); | |
102 | if (status & E1000_STATUS_SPEED_1000) | |
103 | *speed = SPEED_1000; | |
104 | else if (status & E1000_STATUS_SPEED_100) | |
105 | *speed = SPEED_100; | |
106 | else | |
107 | *speed = SPEED_10; | |
108 | ||
109 | if (status & E1000_STATUS_FD) | |
110 | *duplex = FULL_DUPLEX; | |
111 | else | |
112 | *duplex = HALF_DUPLEX; | |
113 | ||
114 | return E1000_SUCCESS; | |
115 | } | |
116 | ||
117 | /** | |
118 | * e1000_reset_hw_vf - Resets the HW | |
119 | * @hw: pointer to the HW structure | |
120 | * | |
121 | * VF's provide a function level reset. This is done using bit 26 of ctrl_reg. | |
122 | * This is all the reset we can perform on a VF. | |
123 | **/ | |
124 | static s32 e1000_reset_hw_vf(struct e1000_hw *hw) | |
125 | { | |
126 | struct e1000_mbx_info *mbx = &hw->mbx; | |
127 | u32 timeout = E1000_VF_INIT_TIMEOUT; | |
128 | u32 ret_val = -E1000_ERR_MAC_INIT; | |
129 | u32 msgbuf[3]; | |
130 | u8 *addr = (u8 *)(&msgbuf[1]); | |
131 | u32 ctrl; | |
132 | ||
133 | /* assert vf queue/interrupt reset */ | |
134 | ctrl = er32(CTRL); | |
135 | ew32(CTRL, ctrl | E1000_CTRL_RST); | |
136 | ||
137 | /* we cannot initialize while the RSTI / RSTD bits are asserted */ | |
138 | while (!mbx->ops.check_for_rst(hw) && timeout) { | |
139 | timeout--; | |
140 | udelay(5); | |
141 | } | |
142 | ||
143 | if (timeout) { | |
144 | /* mailbox timeout can now become active */ | |
145 | mbx->timeout = E1000_VF_MBX_INIT_TIMEOUT; | |
146 | ||
147 | /* notify pf of vf reset completion */ | |
148 | msgbuf[0] = E1000_VF_RESET; | |
149 | mbx->ops.write_posted(hw, msgbuf, 1); | |
150 | ||
151 | msleep(10); | |
152 | ||
153 | /* set our "perm_addr" based on info provided by PF */ | |
154 | ret_val = mbx->ops.read_posted(hw, msgbuf, 3); | |
155 | if (!ret_val) { | |
156 | if (msgbuf[0] == (E1000_VF_RESET | E1000_VT_MSGTYPE_ACK)) | |
157 | memcpy(hw->mac.perm_addr, addr, 6); | |
158 | else | |
159 | ret_val = -E1000_ERR_MAC_INIT; | |
160 | } | |
161 | } | |
162 | ||
163 | return ret_val; | |
164 | } | |
165 | ||
166 | /** | |
167 | * e1000_init_hw_vf - Inits the HW | |
168 | * @hw: pointer to the HW structure | |
169 | * | |
170 | * Not much to do here except clear the PF Reset indication if there is one. | |
171 | **/ | |
172 | static s32 e1000_init_hw_vf(struct e1000_hw *hw) | |
173 | { | |
174 | /* attempt to set and restore our mac address */ | |
175 | e1000_rar_set_vf(hw, hw->mac.addr, 0); | |
176 | ||
177 | return E1000_SUCCESS; | |
178 | } | |
179 | ||
180 | /** | |
181 | * e1000_hash_mc_addr_vf - Generate a multicast hash value | |
182 | * @hw: pointer to the HW structure | |
183 | * @mc_addr: pointer to a multicast address | |
184 | * | |
185 | * Generates a multicast address hash value which is used to determine | |
186 | * the multicast filter table array address and new table value. See | |
187 | * e1000_mta_set_generic() | |
188 | **/ | |
189 | static u32 e1000_hash_mc_addr_vf(struct e1000_hw *hw, u8 *mc_addr) | |
190 | { | |
191 | u32 hash_value, hash_mask; | |
192 | u8 bit_shift = 0; | |
193 | ||
194 | /* Register count multiplied by bits per register */ | |
195 | hash_mask = (hw->mac.mta_reg_count * 32) - 1; | |
196 | ||
197 | /* | |
198 | * The bit_shift is the number of left-shifts | |
199 | * where 0xFF would still fall within the hash mask. | |
200 | */ | |
201 | while (hash_mask >> bit_shift != 0xFF) | |
202 | bit_shift++; | |
203 | ||
204 | hash_value = hash_mask & (((mc_addr[4] >> (8 - bit_shift)) | | |
205 | (((u16) mc_addr[5]) << bit_shift))); | |
206 | ||
207 | return hash_value; | |
208 | } | |
209 | ||
210 | /** | |
211 | * e1000_update_mc_addr_list_vf - Update Multicast addresses | |
212 | * @hw: pointer to the HW structure | |
213 | * @mc_addr_list: array of multicast addresses to program | |
214 | * @mc_addr_count: number of multicast addresses to program | |
215 | * @rar_used_count: the first RAR register free to program | |
216 | * @rar_count: total number of supported Receive Address Registers | |
217 | * | |
218 | * Updates the Receive Address Registers and Multicast Table Array. | |
219 | * The caller must have a packed mc_addr_list of multicast addresses. | |
220 | * The parameter rar_count will usually be hw->mac.rar_entry_count | |
221 | * unless there are workarounds that change this. | |
222 | **/ | |
223 | void e1000_update_mc_addr_list_vf(struct e1000_hw *hw, | |
224 | u8 *mc_addr_list, u32 mc_addr_count, | |
225 | u32 rar_used_count, u32 rar_count) | |
226 | { | |
227 | struct e1000_mbx_info *mbx = &hw->mbx; | |
228 | u32 msgbuf[E1000_VFMAILBOX_SIZE]; | |
229 | u16 *hash_list = (u16 *)&msgbuf[1]; | |
230 | u32 hash_value; | |
231 | u32 cnt, i; | |
232 | ||
233 | /* Each entry in the list uses 1 16 bit word. We have 30 | |
234 | * 16 bit words available in our HW msg buffer (minus 1 for the | |
235 | * msg type). That's 30 hash values if we pack 'em right. If | |
236 | * there are more than 30 MC addresses to add then punt the | |
237 | * extras for now and then add code to handle more than 30 later. | |
238 | * It would be unusual for a server to request that many multi-cast | |
239 | * addresses except for in large enterprise network environments. | |
240 | */ | |
241 | ||
242 | cnt = (mc_addr_count > 30) ? 30 : mc_addr_count; | |
243 | msgbuf[0] = E1000_VF_SET_MULTICAST; | |
244 | msgbuf[0] |= cnt << E1000_VT_MSGINFO_SHIFT; | |
245 | ||
246 | for (i = 0; i < cnt; i++) { | |
247 | hash_value = e1000_hash_mc_addr_vf(hw, mc_addr_list); | |
248 | hash_list[i] = hash_value & 0x0FFFF; | |
249 | mc_addr_list += ETH_ADDR_LEN; | |
250 | } | |
251 | ||
252 | mbx->ops.write_posted(hw, msgbuf, E1000_VFMAILBOX_SIZE); | |
253 | } | |
254 | ||
255 | /** | |
256 | * e1000_set_vfta_vf - Set/Unset vlan filter table address | |
257 | * @hw: pointer to the HW structure | |
258 | * @vid: determines the vfta register and bit to set/unset | |
259 | * @set: if true then set bit, else clear bit | |
260 | **/ | |
261 | static s32 e1000_set_vfta_vf(struct e1000_hw *hw, u16 vid, bool set) | |
262 | { | |
263 | struct e1000_mbx_info *mbx = &hw->mbx; | |
264 | u32 msgbuf[2]; | |
265 | s32 err; | |
266 | ||
267 | msgbuf[0] = E1000_VF_SET_VLAN; | |
268 | msgbuf[1] = vid; | |
269 | /* Setting the 8 bit field MSG INFO to true indicates "add" */ | |
270 | if (set) | |
271 | msgbuf[0] |= 1 << E1000_VT_MSGINFO_SHIFT; | |
272 | ||
273 | mbx->ops.write_posted(hw, msgbuf, 2); | |
274 | ||
275 | err = mbx->ops.read_posted(hw, msgbuf, 2); | |
276 | ||
277 | /* if nacked the vlan was rejected */ | |
278 | if (!err && (msgbuf[0] == (E1000_VF_SET_VLAN | E1000_VT_MSGTYPE_NACK))) | |
279 | err = -E1000_ERR_MAC_INIT; | |
280 | ||
281 | return err; | |
282 | } | |
283 | ||
284 | /** e1000_rlpml_set_vf - Set the maximum receive packet length | |
285 | * @hw: pointer to the HW structure | |
286 | * @max_size: value to assign to max frame size | |
287 | **/ | |
288 | void e1000_rlpml_set_vf(struct e1000_hw *hw, u16 max_size) | |
289 | { | |
290 | struct e1000_mbx_info *mbx = &hw->mbx; | |
291 | u32 msgbuf[2]; | |
292 | ||
293 | msgbuf[0] = E1000_VF_SET_LPE; | |
294 | msgbuf[1] = max_size; | |
295 | ||
296 | mbx->ops.write_posted(hw, msgbuf, 2); | |
297 | } | |
298 | ||
299 | /** | |
300 | * e1000_rar_set_vf - set device MAC address | |
301 | * @hw: pointer to the HW structure | |
302 | * @addr: pointer to the receive address | |
303 | * @index receive address array register | |
304 | **/ | |
305 | static void e1000_rar_set_vf(struct e1000_hw *hw, u8 * addr, u32 index) | |
306 | { | |
307 | struct e1000_mbx_info *mbx = &hw->mbx; | |
308 | u32 msgbuf[3]; | |
309 | u8 *msg_addr = (u8 *)(&msgbuf[1]); | |
310 | s32 ret_val; | |
311 | ||
312 | memset(msgbuf, 0, 12); | |
313 | msgbuf[0] = E1000_VF_SET_MAC_ADDR; | |
314 | memcpy(msg_addr, addr, 6); | |
315 | ret_val = mbx->ops.write_posted(hw, msgbuf, 3); | |
316 | ||
317 | if (!ret_val) | |
318 | ret_val = mbx->ops.read_posted(hw, msgbuf, 3); | |
319 | ||
320 | /* if nacked the address was rejected, use "perm_addr" */ | |
321 | if (!ret_val && | |
322 | (msgbuf[0] == (E1000_VF_SET_MAC_ADDR | E1000_VT_MSGTYPE_NACK))) | |
323 | e1000_read_mac_addr_vf(hw); | |
324 | } | |
325 | ||
326 | /** | |
327 | * e1000_read_mac_addr_vf - Read device MAC address | |
328 | * @hw: pointer to the HW structure | |
329 | **/ | |
330 | static s32 e1000_read_mac_addr_vf(struct e1000_hw *hw) | |
331 | { | |
332 | int i; | |
333 | ||
334 | for (i = 0; i < ETH_ADDR_LEN; i++) | |
335 | hw->mac.addr[i] = hw->mac.perm_addr[i]; | |
336 | ||
337 | return E1000_SUCCESS; | |
338 | } | |
339 | ||
340 | /** | |
341 | * e1000_check_for_link_vf - Check for link for a virtual interface | |
342 | * @hw: pointer to the HW structure | |
343 | * | |
344 | * Checks to see if the underlying PF is still talking to the VF and | |
345 | * if it is then it reports the link state to the hardware, otherwise | |
346 | * it reports link down and returns an error. | |
347 | **/ | |
348 | static s32 e1000_check_for_link_vf(struct e1000_hw *hw) | |
349 | { | |
350 | struct e1000_mbx_info *mbx = &hw->mbx; | |
351 | struct e1000_mac_info *mac = &hw->mac; | |
352 | s32 ret_val = E1000_SUCCESS; | |
353 | u32 in_msg = 0; | |
354 | ||
355 | /* | |
356 | * We only want to run this if there has been a rst asserted. | |
357 | * in this case that could mean a link change, device reset, | |
358 | * or a virtual function reset | |
359 | */ | |
360 | ||
361 | /* If we were hit with a reset drop the link */ | |
362 | if (!mbx->ops.check_for_rst(hw)) | |
363 | mac->get_link_status = true; | |
364 | ||
365 | if (!mac->get_link_status) | |
366 | goto out; | |
367 | ||
368 | /* if link status is down no point in checking to see if pf is up */ | |
369 | if (!(er32(STATUS) & E1000_STATUS_LU)) | |
370 | goto out; | |
371 | ||
372 | /* if the read failed it could just be a mailbox collision, best wait | |
373 | * until we are called again and don't report an error */ | |
374 | if (mbx->ops.read(hw, &in_msg, 1)) | |
375 | goto out; | |
376 | ||
377 | /* if incoming message isn't clear to send we are waiting on response */ | |
378 | if (!(in_msg & E1000_VT_MSGTYPE_CTS)) { | |
379 | /* message is not CTS and is NACK we must have lost CTS status */ | |
380 | if (in_msg & E1000_VT_MSGTYPE_NACK) | |
381 | ret_val = -E1000_ERR_MAC_INIT; | |
382 | goto out; | |
383 | } | |
384 | ||
385 | /* the pf is talking, if we timed out in the past we reinit */ | |
386 | if (!mbx->timeout) { | |
387 | ret_val = -E1000_ERR_MAC_INIT; | |
388 | goto out; | |
389 | } | |
390 | ||
391 | /* if we passed all the tests above then the link is up and we no | |
392 | * longer need to check for link */ | |
393 | mac->get_link_status = false; | |
394 | ||
395 | out: | |
396 | return ret_val; | |
397 | } | |
398 |