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1// SPDX-License-Identifier: GPL-2.0
2/* Copyright(c) 1999 - 2018 Intel Corporation. */
3
4#include "e1000.h"
5
6/**
7 * e1000_calculate_checksum - Calculate checksum for buffer
8 * @buffer: pointer to EEPROM
9 * @length: size of EEPROM to calculate a checksum for
10 *
11 * Calculates the checksum for some buffer on a specified length. The
12 * checksum calculated is returned.
13 **/
14static u8 e1000_calculate_checksum(u8 *buffer, u32 length)
15{
16 u32 i;
17 u8 sum = 0;
18
19 if (!buffer)
20 return 0;
21
22 for (i = 0; i < length; i++)
23 sum += buffer[i];
24
25 return (u8)(0 - sum);
26}
27
28/**
29 * e1000_mng_enable_host_if - Checks host interface is enabled
30 * @hw: pointer to the HW structure
31 *
32 * Returns 0 upon success, else -E1000_ERR_HOST_INTERFACE_COMMAND
33 *
34 * This function checks whether the HOST IF is enabled for command operation
35 * and also checks whether the previous command is completed. It busy waits
36 * in case of previous command is not completed.
37 **/
38static s32 e1000_mng_enable_host_if(struct e1000_hw *hw)
39{
40 u32 hicr;
41 u8 i;
42
43 if (!hw->mac.arc_subsystem_valid) {
44 e_dbg("ARC subsystem not valid.\n");
45 return -E1000_ERR_HOST_INTERFACE_COMMAND;
46 }
47
48 /* Check that the host interface is enabled. */
49 hicr = er32(HICR);
50 if (!(hicr & E1000_HICR_EN)) {
51 e_dbg("E1000_HOST_EN bit disabled.\n");
52 return -E1000_ERR_HOST_INTERFACE_COMMAND;
53 }
54 /* check the previous command is completed */
55 for (i = 0; i < E1000_MNG_DHCP_COMMAND_TIMEOUT; i++) {
56 hicr = er32(HICR);
57 if (!(hicr & E1000_HICR_C))
58 break;
59 mdelay(1);
60 }
61
62 if (i == E1000_MNG_DHCP_COMMAND_TIMEOUT) {
63 e_dbg("Previous command timeout failed.\n");
64 return -E1000_ERR_HOST_INTERFACE_COMMAND;
65 }
66
67 return 0;
68}
69
70/**
71 * e1000e_check_mng_mode_generic - Generic check management mode
72 * @hw: pointer to the HW structure
73 *
74 * Reads the firmware semaphore register and returns true (>0) if
75 * manageability is enabled, else false (0).
76 **/
77bool e1000e_check_mng_mode_generic(struct e1000_hw *hw)
78{
79 u32 fwsm = er32(FWSM);
80
81 return (fwsm & E1000_FWSM_MODE_MASK) ==
82 (E1000_MNG_IAMT_MODE << E1000_FWSM_MODE_SHIFT);
83}
84
85/**
86 * e1000e_enable_tx_pkt_filtering - Enable packet filtering on Tx
87 * @hw: pointer to the HW structure
88 *
89 * Enables packet filtering on transmit packets if manageability is enabled
90 * and host interface is enabled.
91 **/
92bool e1000e_enable_tx_pkt_filtering(struct e1000_hw *hw)
93{
94 struct e1000_host_mng_dhcp_cookie *hdr = &hw->mng_cookie;
95 u32 *buffer = (u32 *)&hw->mng_cookie;
96 u32 offset;
97 s32 ret_val, hdr_csum, csum;
98 u8 i, len;
99
100 hw->mac.tx_pkt_filtering = true;
101
102 /* No manageability, no filtering */
103 if (!hw->mac.ops.check_mng_mode(hw)) {
104 hw->mac.tx_pkt_filtering = false;
105 return hw->mac.tx_pkt_filtering;
106 }
107
108 /* If we can't read from the host interface for whatever
109 * reason, disable filtering.
110 */
111 ret_val = e1000_mng_enable_host_if(hw);
112 if (ret_val) {
113 hw->mac.tx_pkt_filtering = false;
114 return hw->mac.tx_pkt_filtering;
115 }
116
117 /* Read in the header. Length and offset are in dwords. */
118 len = E1000_MNG_DHCP_COOKIE_LENGTH >> 2;
119 offset = E1000_MNG_DHCP_COOKIE_OFFSET >> 2;
120 for (i = 0; i < len; i++)
121 *(buffer + i) = E1000_READ_REG_ARRAY(hw, E1000_HOST_IF,
122 offset + i);
123 hdr_csum = hdr->checksum;
124 hdr->checksum = 0;
125 csum = e1000_calculate_checksum((u8 *)hdr,
126 E1000_MNG_DHCP_COOKIE_LENGTH);
127 /* If either the checksums or signature don't match, then
128 * the cookie area isn't considered valid, in which case we
129 * take the safe route of assuming Tx filtering is enabled.
130 */
131 if ((hdr_csum != csum) || (hdr->signature != E1000_IAMT_SIGNATURE)) {
132 hw->mac.tx_pkt_filtering = true;
133 return hw->mac.tx_pkt_filtering;
134 }
135
136 /* Cookie area is valid, make the final check for filtering. */
137 if (!(hdr->status & E1000_MNG_DHCP_COOKIE_STATUS_PARSING))
138 hw->mac.tx_pkt_filtering = false;
139
140 return hw->mac.tx_pkt_filtering;
141}
142
143/**
144 * e1000_mng_write_cmd_header - Writes manageability command header
145 * @hw: pointer to the HW structure
146 * @hdr: pointer to the host interface command header
147 *
148 * Writes the command header after does the checksum calculation.
149 **/
150static s32 e1000_mng_write_cmd_header(struct e1000_hw *hw,
151 struct e1000_host_mng_command_header *hdr)
152{
153 u16 i, length = sizeof(struct e1000_host_mng_command_header);
154
155 /* Write the whole command header structure with new checksum. */
156
157 hdr->checksum = e1000_calculate_checksum((u8 *)hdr, length);
158
159 length >>= 2;
160 /* Write the relevant command block into the ram area. */
161 for (i = 0; i < length; i++) {
162 E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, i, *((u32 *)hdr + i));
163 e1e_flush();
164 }
165
166 return 0;
167}
168
169/**
170 * e1000_mng_host_if_write - Write to the manageability host interface
171 * @hw: pointer to the HW structure
172 * @buffer: pointer to the host interface buffer
173 * @length: size of the buffer
174 * @offset: location in the buffer to write to
175 * @sum: sum of the data (not checksum)
176 *
177 * This function writes the buffer content at the offset given on the host if.
178 * It also does alignment considerations to do the writes in most efficient
179 * way. Also fills up the sum of the buffer in *buffer parameter.
180 **/
181static s32 e1000_mng_host_if_write(struct e1000_hw *hw, u8 *buffer,
182 u16 length, u16 offset, u8 *sum)
183{
184 u8 *tmp;
185 u8 *bufptr = buffer;
186 u32 data = 0;
187 u16 remaining, i, j, prev_bytes;
188
189 /* sum = only sum of the data and it is not checksum */
190
191 if (length == 0 || offset + length > E1000_HI_MAX_MNG_DATA_LENGTH)
192 return -E1000_ERR_PARAM;
193
194 tmp = (u8 *)&data;
195 prev_bytes = offset & 0x3;
196 offset >>= 2;
197
198 if (prev_bytes) {
199 data = E1000_READ_REG_ARRAY(hw, E1000_HOST_IF, offset);
200 for (j = prev_bytes; j < sizeof(u32); j++) {
201 *(tmp + j) = *bufptr++;
202 *sum += *(tmp + j);
203 }
204 E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset, data);
205 length -= j - prev_bytes;
206 offset++;
207 }
208
209 remaining = length & 0x3;
210 length -= remaining;
211
212 /* Calculate length in DWORDs */
213 length >>= 2;
214
215 /* The device driver writes the relevant command block into the
216 * ram area.
217 */
218 for (i = 0; i < length; i++) {
219 for (j = 0; j < sizeof(u32); j++) {
220 *(tmp + j) = *bufptr++;
221 *sum += *(tmp + j);
222 }
223
224 E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset + i, data);
225 }
226 if (remaining) {
227 for (j = 0; j < sizeof(u32); j++) {
228 if (j < remaining)
229 *(tmp + j) = *bufptr++;
230 else
231 *(tmp + j) = 0;
232
233 *sum += *(tmp + j);
234 }
235 E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset + i, data);
236 }
237
238 return 0;
239}
240
241/**
242 * e1000e_mng_write_dhcp_info - Writes DHCP info to host interface
243 * @hw: pointer to the HW structure
244 * @buffer: pointer to the host interface
245 * @length: size of the buffer
246 *
247 * Writes the DHCP information to the host interface.
248 **/
249s32 e1000e_mng_write_dhcp_info(struct e1000_hw *hw, u8 *buffer, u16 length)
250{
251 struct e1000_host_mng_command_header hdr;
252 s32 ret_val;
253 u32 hicr;
254
255 hdr.command_id = E1000_MNG_DHCP_TX_PAYLOAD_CMD;
256 hdr.command_length = length;
257 hdr.reserved1 = 0;
258 hdr.reserved2 = 0;
259 hdr.checksum = 0;
260
261 /* Enable the host interface */
262 ret_val = e1000_mng_enable_host_if(hw);
263 if (ret_val)
264 return ret_val;
265
266 /* Populate the host interface with the contents of "buffer". */
267 ret_val = e1000_mng_host_if_write(hw, buffer, length,
268 sizeof(hdr), &(hdr.checksum));
269 if (ret_val)
270 return ret_val;
271
272 /* Write the manageability command header */
273 ret_val = e1000_mng_write_cmd_header(hw, &hdr);
274 if (ret_val)
275 return ret_val;
276
277 /* Tell the ARC a new command is pending. */
278 hicr = er32(HICR);
279 ew32(HICR, hicr | E1000_HICR_C);
280
281 return 0;
282}
283
284/**
285 * e1000e_enable_mng_pass_thru - Check if management passthrough is needed
286 * @hw: pointer to the HW structure
287 *
288 * Verifies the hardware needs to leave interface enabled so that frames can
289 * be directed to and from the management interface.
290 **/
291bool e1000e_enable_mng_pass_thru(struct e1000_hw *hw)
292{
293 u32 manc;
294 u32 fwsm, factps;
295
296 manc = er32(MANC);
297
298 if (!(manc & E1000_MANC_RCV_TCO_EN))
299 return false;
300
301 if (hw->mac.has_fwsm) {
302 fwsm = er32(FWSM);
303 factps = er32(FACTPS);
304
305 if (!(factps & E1000_FACTPS_MNGCG) &&
306 ((fwsm & E1000_FWSM_MODE_MASK) ==
307 (e1000_mng_mode_pt << E1000_FWSM_MODE_SHIFT)))
308 return true;
309 } else if ((hw->mac.type == e1000_82574) ||
310 (hw->mac.type == e1000_82583)) {
311 u16 data;
312 s32 ret_val;
313
314 factps = er32(FACTPS);
315 ret_val = e1000_read_nvm(hw, NVM_INIT_CONTROL2_REG, 1, &data);
316 if (ret_val)
317 return false;
318
319 if (!(factps & E1000_FACTPS_MNGCG) &&
320 ((data & E1000_NVM_INIT_CTRL2_MNGM) ==
321 (e1000_mng_mode_pt << 13)))
322 return true;
323 } else if ((manc & E1000_MANC_SMBUS_EN) &&
324 !(manc & E1000_MANC_ASF_EN)) {
325 return true;
326 }
327
328 return false;
329}
1/* Intel PRO/1000 Linux driver
2 * Copyright(c) 1999 - 2015 Intel Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * The full GNU General Public License is included in this distribution in
14 * the file called "COPYING".
15 *
16 * Contact Information:
17 * Linux NICS <linux.nics@intel.com>
18 * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
19 * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
20 */
21
22#include "e1000.h"
23
24/**
25 * e1000_calculate_checksum - Calculate checksum for buffer
26 * @buffer: pointer to EEPROM
27 * @length: size of EEPROM to calculate a checksum for
28 *
29 * Calculates the checksum for some buffer on a specified length. The
30 * checksum calculated is returned.
31 **/
32static u8 e1000_calculate_checksum(u8 *buffer, u32 length)
33{
34 u32 i;
35 u8 sum = 0;
36
37 if (!buffer)
38 return 0;
39
40 for (i = 0; i < length; i++)
41 sum += buffer[i];
42
43 return (u8)(0 - sum);
44}
45
46/**
47 * e1000_mng_enable_host_if - Checks host interface is enabled
48 * @hw: pointer to the HW structure
49 *
50 * Returns 0 upon success, else -E1000_ERR_HOST_INTERFACE_COMMAND
51 *
52 * This function checks whether the HOST IF is enabled for command operation
53 * and also checks whether the previous command is completed. It busy waits
54 * in case of previous command is not completed.
55 **/
56static s32 e1000_mng_enable_host_if(struct e1000_hw *hw)
57{
58 u32 hicr;
59 u8 i;
60
61 if (!hw->mac.arc_subsystem_valid) {
62 e_dbg("ARC subsystem not valid.\n");
63 return -E1000_ERR_HOST_INTERFACE_COMMAND;
64 }
65
66 /* Check that the host interface is enabled. */
67 hicr = er32(HICR);
68 if (!(hicr & E1000_HICR_EN)) {
69 e_dbg("E1000_HOST_EN bit disabled.\n");
70 return -E1000_ERR_HOST_INTERFACE_COMMAND;
71 }
72 /* check the previous command is completed */
73 for (i = 0; i < E1000_MNG_DHCP_COMMAND_TIMEOUT; i++) {
74 hicr = er32(HICR);
75 if (!(hicr & E1000_HICR_C))
76 break;
77 mdelay(1);
78 }
79
80 if (i == E1000_MNG_DHCP_COMMAND_TIMEOUT) {
81 e_dbg("Previous command timeout failed.\n");
82 return -E1000_ERR_HOST_INTERFACE_COMMAND;
83 }
84
85 return 0;
86}
87
88/**
89 * e1000e_check_mng_mode_generic - Generic check management mode
90 * @hw: pointer to the HW structure
91 *
92 * Reads the firmware semaphore register and returns true (>0) if
93 * manageability is enabled, else false (0).
94 **/
95bool e1000e_check_mng_mode_generic(struct e1000_hw *hw)
96{
97 u32 fwsm = er32(FWSM);
98
99 return (fwsm & E1000_FWSM_MODE_MASK) ==
100 (E1000_MNG_IAMT_MODE << E1000_FWSM_MODE_SHIFT);
101}
102
103/**
104 * e1000e_enable_tx_pkt_filtering - Enable packet filtering on Tx
105 * @hw: pointer to the HW structure
106 *
107 * Enables packet filtering on transmit packets if manageability is enabled
108 * and host interface is enabled.
109 **/
110bool e1000e_enable_tx_pkt_filtering(struct e1000_hw *hw)
111{
112 struct e1000_host_mng_dhcp_cookie *hdr = &hw->mng_cookie;
113 u32 *buffer = (u32 *)&hw->mng_cookie;
114 u32 offset;
115 s32 ret_val, hdr_csum, csum;
116 u8 i, len;
117
118 hw->mac.tx_pkt_filtering = true;
119
120 /* No manageability, no filtering */
121 if (!hw->mac.ops.check_mng_mode(hw)) {
122 hw->mac.tx_pkt_filtering = false;
123 return hw->mac.tx_pkt_filtering;
124 }
125
126 /* If we can't read from the host interface for whatever
127 * reason, disable filtering.
128 */
129 ret_val = e1000_mng_enable_host_if(hw);
130 if (ret_val) {
131 hw->mac.tx_pkt_filtering = false;
132 return hw->mac.tx_pkt_filtering;
133 }
134
135 /* Read in the header. Length and offset are in dwords. */
136 len = E1000_MNG_DHCP_COOKIE_LENGTH >> 2;
137 offset = E1000_MNG_DHCP_COOKIE_OFFSET >> 2;
138 for (i = 0; i < len; i++)
139 *(buffer + i) = E1000_READ_REG_ARRAY(hw, E1000_HOST_IF,
140 offset + i);
141 hdr_csum = hdr->checksum;
142 hdr->checksum = 0;
143 csum = e1000_calculate_checksum((u8 *)hdr,
144 E1000_MNG_DHCP_COOKIE_LENGTH);
145 /* If either the checksums or signature don't match, then
146 * the cookie area isn't considered valid, in which case we
147 * take the safe route of assuming Tx filtering is enabled.
148 */
149 if ((hdr_csum != csum) || (hdr->signature != E1000_IAMT_SIGNATURE)) {
150 hw->mac.tx_pkt_filtering = true;
151 return hw->mac.tx_pkt_filtering;
152 }
153
154 /* Cookie area is valid, make the final check for filtering. */
155 if (!(hdr->status & E1000_MNG_DHCP_COOKIE_STATUS_PARSING))
156 hw->mac.tx_pkt_filtering = false;
157
158 return hw->mac.tx_pkt_filtering;
159}
160
161/**
162 * e1000_mng_write_cmd_header - Writes manageability command header
163 * @hw: pointer to the HW structure
164 * @hdr: pointer to the host interface command header
165 *
166 * Writes the command header after does the checksum calculation.
167 **/
168static s32 e1000_mng_write_cmd_header(struct e1000_hw *hw,
169 struct e1000_host_mng_command_header *hdr)
170{
171 u16 i, length = sizeof(struct e1000_host_mng_command_header);
172
173 /* Write the whole command header structure with new checksum. */
174
175 hdr->checksum = e1000_calculate_checksum((u8 *)hdr, length);
176
177 length >>= 2;
178 /* Write the relevant command block into the ram area. */
179 for (i = 0; i < length; i++) {
180 E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, i, *((u32 *)hdr + i));
181 e1e_flush();
182 }
183
184 return 0;
185}
186
187/**
188 * e1000_mng_host_if_write - Write to the manageability host interface
189 * @hw: pointer to the HW structure
190 * @buffer: pointer to the host interface buffer
191 * @length: size of the buffer
192 * @offset: location in the buffer to write to
193 * @sum: sum of the data (not checksum)
194 *
195 * This function writes the buffer content at the offset given on the host if.
196 * It also does alignment considerations to do the writes in most efficient
197 * way. Also fills up the sum of the buffer in *buffer parameter.
198 **/
199static s32 e1000_mng_host_if_write(struct e1000_hw *hw, u8 *buffer,
200 u16 length, u16 offset, u8 *sum)
201{
202 u8 *tmp;
203 u8 *bufptr = buffer;
204 u32 data = 0;
205 u16 remaining, i, j, prev_bytes;
206
207 /* sum = only sum of the data and it is not checksum */
208
209 if (length == 0 || offset + length > E1000_HI_MAX_MNG_DATA_LENGTH)
210 return -E1000_ERR_PARAM;
211
212 tmp = (u8 *)&data;
213 prev_bytes = offset & 0x3;
214 offset >>= 2;
215
216 if (prev_bytes) {
217 data = E1000_READ_REG_ARRAY(hw, E1000_HOST_IF, offset);
218 for (j = prev_bytes; j < sizeof(u32); j++) {
219 *(tmp + j) = *bufptr++;
220 *sum += *(tmp + j);
221 }
222 E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset, data);
223 length -= j - prev_bytes;
224 offset++;
225 }
226
227 remaining = length & 0x3;
228 length -= remaining;
229
230 /* Calculate length in DWORDs */
231 length >>= 2;
232
233 /* The device driver writes the relevant command block into the
234 * ram area.
235 */
236 for (i = 0; i < length; i++) {
237 for (j = 0; j < sizeof(u32); j++) {
238 *(tmp + j) = *bufptr++;
239 *sum += *(tmp + j);
240 }
241
242 E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset + i, data);
243 }
244 if (remaining) {
245 for (j = 0; j < sizeof(u32); j++) {
246 if (j < remaining)
247 *(tmp + j) = *bufptr++;
248 else
249 *(tmp + j) = 0;
250
251 *sum += *(tmp + j);
252 }
253 E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset + i, data);
254 }
255
256 return 0;
257}
258
259/**
260 * e1000e_mng_write_dhcp_info - Writes DHCP info to host interface
261 * @hw: pointer to the HW structure
262 * @buffer: pointer to the host interface
263 * @length: size of the buffer
264 *
265 * Writes the DHCP information to the host interface.
266 **/
267s32 e1000e_mng_write_dhcp_info(struct e1000_hw *hw, u8 *buffer, u16 length)
268{
269 struct e1000_host_mng_command_header hdr;
270 s32 ret_val;
271 u32 hicr;
272
273 hdr.command_id = E1000_MNG_DHCP_TX_PAYLOAD_CMD;
274 hdr.command_length = length;
275 hdr.reserved1 = 0;
276 hdr.reserved2 = 0;
277 hdr.checksum = 0;
278
279 /* Enable the host interface */
280 ret_val = e1000_mng_enable_host_if(hw);
281 if (ret_val)
282 return ret_val;
283
284 /* Populate the host interface with the contents of "buffer". */
285 ret_val = e1000_mng_host_if_write(hw, buffer, length,
286 sizeof(hdr), &(hdr.checksum));
287 if (ret_val)
288 return ret_val;
289
290 /* Write the manageability command header */
291 ret_val = e1000_mng_write_cmd_header(hw, &hdr);
292 if (ret_val)
293 return ret_val;
294
295 /* Tell the ARC a new command is pending. */
296 hicr = er32(HICR);
297 ew32(HICR, hicr | E1000_HICR_C);
298
299 return 0;
300}
301
302/**
303 * e1000e_enable_mng_pass_thru - Check if management passthrough is needed
304 * @hw: pointer to the HW structure
305 *
306 * Verifies the hardware needs to leave interface enabled so that frames can
307 * be directed to and from the management interface.
308 **/
309bool e1000e_enable_mng_pass_thru(struct e1000_hw *hw)
310{
311 u32 manc;
312 u32 fwsm, factps;
313
314 manc = er32(MANC);
315
316 if (!(manc & E1000_MANC_RCV_TCO_EN))
317 return false;
318
319 if (hw->mac.has_fwsm) {
320 fwsm = er32(FWSM);
321 factps = er32(FACTPS);
322
323 if (!(factps & E1000_FACTPS_MNGCG) &&
324 ((fwsm & E1000_FWSM_MODE_MASK) ==
325 (e1000_mng_mode_pt << E1000_FWSM_MODE_SHIFT)))
326 return true;
327 } else if ((hw->mac.type == e1000_82574) ||
328 (hw->mac.type == e1000_82583)) {
329 u16 data;
330 s32 ret_val;
331
332 factps = er32(FACTPS);
333 ret_val = e1000_read_nvm(hw, NVM_INIT_CONTROL2_REG, 1, &data);
334 if (ret_val)
335 return false;
336
337 if (!(factps & E1000_FACTPS_MNGCG) &&
338 ((data & E1000_NVM_INIT_CTRL2_MNGM) ==
339 (e1000_mng_mode_pt << 13)))
340 return true;
341 } else if ((manc & E1000_MANC_SMBUS_EN) &&
342 !(manc & E1000_MANC_ASF_EN)) {
343 return true;
344 }
345
346 return false;
347}