1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright(c) 1999 - 2018 Intel Corporation. */
7 * e1000_calculate_checksum - Calculate checksum for buffer
8 * @buffer: pointer to EEPROM
9 * @length: size of EEPROM to calculate a checksum for
11 * Calculates the checksum for some buffer on a specified length. The
12 * checksum calculated is returned.
14 static u8 e1000_calculate_checksum(u8 *buffer, u32 length)
22 for (i = 0; i < length; i++)
29 * e1000_mng_enable_host_if - Checks host interface is enabled
30 * @hw: pointer to the HW structure
32 * Returns 0 upon success, else -E1000_ERR_HOST_INTERFACE_COMMAND
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.
38 static s32 e1000_mng_enable_host_if(struct e1000_hw *hw)
43 if (!hw->mac.arc_subsystem_valid) {
44 e_dbg("ARC subsystem not valid.\n");
45 return -E1000_ERR_HOST_INTERFACE_COMMAND;
48 /* Check that the host interface is enabled. */
50 if (!(hicr & E1000_HICR_EN)) {
51 e_dbg("E1000_HOST_EN bit disabled.\n");
52 return -E1000_ERR_HOST_INTERFACE_COMMAND;
54 /* check the previous command is completed */
55 for (i = 0; i < E1000_MNG_DHCP_COMMAND_TIMEOUT; i++) {
57 if (!(hicr & E1000_HICR_C))
62 if (i == E1000_MNG_DHCP_COMMAND_TIMEOUT) {
63 e_dbg("Previous command timeout failed.\n");
64 return -E1000_ERR_HOST_INTERFACE_COMMAND;
71 * e1000e_check_mng_mode_generic - Generic check management mode
72 * @hw: pointer to the HW structure
74 * Reads the firmware semaphore register and returns true (>0) if
75 * manageability is enabled, else false (0).
77 bool e1000e_check_mng_mode_generic(struct e1000_hw *hw)
79 u32 fwsm = er32(FWSM);
81 return (fwsm & E1000_FWSM_MODE_MASK) ==
82 (E1000_MNG_IAMT_MODE << E1000_FWSM_MODE_SHIFT);
86 * e1000e_enable_tx_pkt_filtering - Enable packet filtering on Tx
87 * @hw: pointer to the HW structure
89 * Enables packet filtering on transmit packets if manageability is enabled
90 * and host interface is enabled.
92 bool e1000e_enable_tx_pkt_filtering(struct e1000_hw *hw)
94 struct e1000_host_mng_dhcp_cookie *hdr = &hw->mng_cookie;
95 u32 *buffer = (u32 *)&hw->mng_cookie;
97 s32 ret_val, hdr_csum, csum;
100 hw->mac.tx_pkt_filtering = true;
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;
108 /* If we can't read from the host interface for whatever
109 * reason, disable filtering.
111 ret_val = e1000_mng_enable_host_if(hw);
113 hw->mac.tx_pkt_filtering = false;
114 return hw->mac.tx_pkt_filtering;
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,
123 hdr_csum = hdr->checksum;
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.
131 if ((hdr_csum != csum) || (hdr->signature != E1000_IAMT_SIGNATURE)) {
132 hw->mac.tx_pkt_filtering = true;
133 return hw->mac.tx_pkt_filtering;
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;
140 return hw->mac.tx_pkt_filtering;
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
148 * Writes the command header after does the checksum calculation.
150 static s32 e1000_mng_write_cmd_header(struct e1000_hw *hw,
151 struct e1000_host_mng_command_header *hdr)
153 u16 i, length = sizeof(struct e1000_host_mng_command_header);
155 /* Write the whole command header structure with new checksum. */
157 hdr->checksum = e1000_calculate_checksum((u8 *)hdr, length);
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));
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)
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.
181 static s32 e1000_mng_host_if_write(struct e1000_hw *hw, u8 *buffer,
182 u16 length, u16 offset, u8 *sum)
187 u16 remaining, i, j, prev_bytes;
189 /* sum = only sum of the data and it is not checksum */
191 if (length == 0 || offset + length > E1000_HI_MAX_MNG_DATA_LENGTH)
192 return -E1000_ERR_PARAM;
195 prev_bytes = offset & 0x3;
199 data = E1000_READ_REG_ARRAY(hw, E1000_HOST_IF, offset);
200 for (j = prev_bytes; j < sizeof(u32); j++) {
201 *(tmp + j) = *bufptr++;
204 E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset, data);
205 length -= j - prev_bytes;
209 remaining = length & 0x3;
212 /* Calculate length in DWORDs */
215 /* The device driver writes the relevant command block into the
218 for (i = 0; i < length; i++) {
219 for (j = 0; j < sizeof(u32); j++) {
220 *(tmp + j) = *bufptr++;
224 E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset + i, data);
227 for (j = 0; j < sizeof(u32); j++) {
229 *(tmp + j) = *bufptr++;
235 E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset + i, data);
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
247 * Writes the DHCP information to the host interface.
249 s32 e1000e_mng_write_dhcp_info(struct e1000_hw *hw, u8 *buffer, u16 length)
251 struct e1000_host_mng_command_header hdr;
255 hdr.command_id = E1000_MNG_DHCP_TX_PAYLOAD_CMD;
256 hdr.command_length = length;
261 /* Enable the host interface */
262 ret_val = e1000_mng_enable_host_if(hw);
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));
272 /* Write the manageability command header */
273 ret_val = e1000_mng_write_cmd_header(hw, &hdr);
277 /* Tell the ARC a new command is pending. */
279 ew32(HICR, hicr | E1000_HICR_C);
285 * e1000e_enable_mng_pass_thru - Check if management passthrough is needed
286 * @hw: pointer to the HW structure
288 * Verifies the hardware needs to leave interface enabled so that frames can
289 * be directed to and from the management interface.
291 bool e1000e_enable_mng_pass_thru(struct e1000_hw *hw)
298 if (!(manc & E1000_MANC_RCV_TCO_EN))
301 if (hw->mac.has_fwsm) {
303 factps = er32(FACTPS);
305 if (!(factps & E1000_FACTPS_MNGCG) &&
306 ((fwsm & E1000_FWSM_MODE_MASK) ==
307 (e1000_mng_mode_pt << E1000_FWSM_MODE_SHIFT)))
309 } else if ((hw->mac.type == e1000_82574) ||
310 (hw->mac.type == e1000_82583)) {
314 factps = er32(FACTPS);
315 ret_val = e1000_read_nvm(hw, NVM_INIT_CONTROL2_REG, 1, &data);
319 if (!(factps & E1000_FACTPS_MNGCG) &&
320 ((data & E1000_NVM_INIT_CTRL2_MNGM) ==
321 (e1000_mng_mode_pt << 13)))
323 } else if ((manc & E1000_MANC_SMBUS_EN) &&
324 !(manc & E1000_MANC_ASF_EN)) {