--- /dev/null
+/* Intel PRO/1000 Linux driver
+ * Copyright(c) 1999 - 2014 Intel Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ *
+ * The full GNU General Public License is included in this distribution in
+ * the file called "COPYING".
+ *
+ * Contact Information:
+ * Linux NICS <linux.nics@intel.com>
+ * e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+ * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+ */
+
+#include "e1000.h"
+
+/**
+ * e1000_calculate_checksum - Calculate checksum for buffer
+ * @buffer: pointer to EEPROM
+ * @length: size of EEPROM to calculate a checksum for
+ *
+ * Calculates the checksum for some buffer on a specified length. The
+ * checksum calculated is returned.
+ **/
+static u8 e1000_calculate_checksum(u8 *buffer, u32 length)
+{
+ u32 i;
+ u8 sum = 0;
+
+ if (!buffer)
+ return 0;
+
+ for (i = 0; i < length; i++)
+ sum += buffer[i];
+
+ return (u8)(0 - sum);
+}
+
+/**
+ * e1000_mng_enable_host_if - Checks host interface is enabled
+ * @hw: pointer to the HW structure
+ *
+ * Returns 0 upon success, else -E1000_ERR_HOST_INTERFACE_COMMAND
+ *
+ * This function checks whether the HOST IF is enabled for command operation
+ * and also checks whether the previous command is completed. It busy waits
+ * in case of previous command is not completed.
+ **/
+static s32 e1000_mng_enable_host_if(struct e1000_hw *hw)
+{
+ u32 hicr;
+ u8 i;
+
+ if (!hw->mac.arc_subsystem_valid) {
+ e_dbg("ARC subsystem not valid.\n");
+ return -E1000_ERR_HOST_INTERFACE_COMMAND;
+ }
+
+ /* Check that the host interface is enabled. */
+ hicr = er32(HICR);
+ if (!(hicr & E1000_HICR_EN)) {
+ e_dbg("E1000_HOST_EN bit disabled.\n");
+ return -E1000_ERR_HOST_INTERFACE_COMMAND;
+ }
+ /* check the previous command is completed */
+ for (i = 0; i < E1000_MNG_DHCP_COMMAND_TIMEOUT; i++) {
+ hicr = er32(HICR);
+ if (!(hicr & E1000_HICR_C))
+ break;
+ mdelay(1);
+ }
+
+ if (i == E1000_MNG_DHCP_COMMAND_TIMEOUT) {
+ e_dbg("Previous command timeout failed.\n");
+ return -E1000_ERR_HOST_INTERFACE_COMMAND;
+ }
+
+ return 0;
+}
+
+/**
+ * e1000e_check_mng_mode_generic - Generic check management mode
+ * @hw: pointer to the HW structure
+ *
+ * Reads the firmware semaphore register and returns true (>0) if
+ * manageability is enabled, else false (0).
+ **/
+bool e1000e_check_mng_mode_generic(struct e1000_hw *hw)
+{
+ u32 fwsm = er32(FWSM);
+
+ return (fwsm & E1000_FWSM_MODE_MASK) ==
+ (E1000_MNG_IAMT_MODE << E1000_FWSM_MODE_SHIFT);
+}
+
+/**
+ * e1000e_enable_tx_pkt_filtering - Enable packet filtering on Tx
+ * @hw: pointer to the HW structure
+ *
+ * Enables packet filtering on transmit packets if manageability is enabled
+ * and host interface is enabled.
+ **/
+bool e1000e_enable_tx_pkt_filtering(struct e1000_hw *hw)
+{
+ struct e1000_host_mng_dhcp_cookie *hdr = &hw->mng_cookie;
+ u32 *buffer = (u32 *)&hw->mng_cookie;
+ u32 offset;
+ s32 ret_val, hdr_csum, csum;
+ u8 i, len;
+
+ hw->mac.tx_pkt_filtering = true;
+
+ /* No manageability, no filtering */
+ if (!hw->mac.ops.check_mng_mode(hw)) {
+ hw->mac.tx_pkt_filtering = false;
+ return hw->mac.tx_pkt_filtering;
+ }
+
+ /* If we can't read from the host interface for whatever
+ * reason, disable filtering.
+ */
+ ret_val = e1000_mng_enable_host_if(hw);
+ if (ret_val) {
+ hw->mac.tx_pkt_filtering = false;
+ return hw->mac.tx_pkt_filtering;
+ }
+
+ /* Read in the header. Length and offset are in dwords. */
+ len = E1000_MNG_DHCP_COOKIE_LENGTH >> 2;
+ offset = E1000_MNG_DHCP_COOKIE_OFFSET >> 2;
+ for (i = 0; i < len; i++)
+ *(buffer + i) = E1000_READ_REG_ARRAY(hw, E1000_HOST_IF,
+ offset + i);
+ hdr_csum = hdr->checksum;
+ hdr->checksum = 0;
+ csum = e1000_calculate_checksum((u8 *)hdr,
+ E1000_MNG_DHCP_COOKIE_LENGTH);
+ /* If either the checksums or signature don't match, then
+ * the cookie area isn't considered valid, in which case we
+ * take the safe route of assuming Tx filtering is enabled.
+ */
+ if ((hdr_csum != csum) || (hdr->signature != E1000_IAMT_SIGNATURE)) {
+ hw->mac.tx_pkt_filtering = true;
+ return hw->mac.tx_pkt_filtering;
+ }
+
+ /* Cookie area is valid, make the final check for filtering. */
+ if (!(hdr->status & E1000_MNG_DHCP_COOKIE_STATUS_PARSING))
+ hw->mac.tx_pkt_filtering = false;
+
+ return hw->mac.tx_pkt_filtering;
+}
+
+/**
+ * e1000_mng_write_cmd_header - Writes manageability command header
+ * @hw: pointer to the HW structure
+ * @hdr: pointer to the host interface command header
+ *
+ * Writes the command header after does the checksum calculation.
+ **/
+static s32 e1000_mng_write_cmd_header(struct e1000_hw *hw,
+ struct e1000_host_mng_command_header *hdr)
+{
+ u16 i, length = sizeof(struct e1000_host_mng_command_header);
+
+ /* Write the whole command header structure with new checksum. */
+
+ hdr->checksum = e1000_calculate_checksum((u8 *)hdr, length);
+
+ length >>= 2;
+ /* Write the relevant command block into the ram area. */
+ for (i = 0; i < length; i++) {
+ E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, i, *((u32 *)hdr + i));
+ e1e_flush();
+ }
+
+ return 0;
+}
+
+/**
+ * e1000_mng_host_if_write - Write to the manageability host interface
+ * @hw: pointer to the HW structure
+ * @buffer: pointer to the host interface buffer
+ * @length: size of the buffer
+ * @offset: location in the buffer to write to
+ * @sum: sum of the data (not checksum)
+ *
+ * This function writes the buffer content at the offset given on the host if.
+ * It also does alignment considerations to do the writes in most efficient
+ * way. Also fills up the sum of the buffer in *buffer parameter.
+ **/
+static s32 e1000_mng_host_if_write(struct e1000_hw *hw, u8 *buffer,
+ u16 length, u16 offset, u8 *sum)
+{
+ u8 *tmp;
+ u8 *bufptr = buffer;
+ u32 data = 0;
+ u16 remaining, i, j, prev_bytes;
+
+ /* sum = only sum of the data and it is not checksum */
+
+ if (length == 0 || offset + length > E1000_HI_MAX_MNG_DATA_LENGTH)
+ return -E1000_ERR_PARAM;
+
+ tmp = (u8 *)&data;
+ prev_bytes = offset & 0x3;
+ offset >>= 2;
+
+ if (prev_bytes) {
+ data = E1000_READ_REG_ARRAY(hw, E1000_HOST_IF, offset);
+ for (j = prev_bytes; j < sizeof(u32); j++) {
+ *(tmp + j) = *bufptr++;
+ *sum += *(tmp + j);
+ }
+ E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset, data);
+ length -= j - prev_bytes;
+ offset++;
+ }
+
+ remaining = length & 0x3;
+ length -= remaining;
+
+ /* Calculate length in DWORDs */
+ length >>= 2;
+
+ /* The device driver writes the relevant command block into the
+ * ram area.
+ */
+ for (i = 0; i < length; i++) {
+ for (j = 0; j < sizeof(u32); j++) {
+ *(tmp + j) = *bufptr++;
+ *sum += *(tmp + j);
+ }
+
+ E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset + i, data);
+ }
+ if (remaining) {
+ for (j = 0; j < sizeof(u32); j++) {
+ if (j < remaining)
+ *(tmp + j) = *bufptr++;
+ else
+ *(tmp + j) = 0;
+
+ *sum += *(tmp + j);
+ }
+ E1000_WRITE_REG_ARRAY(hw, E1000_HOST_IF, offset + i, data);
+ }
+
+ return 0;
+}
+
+/**
+ * e1000e_mng_write_dhcp_info - Writes DHCP info to host interface
+ * @hw: pointer to the HW structure
+ * @buffer: pointer to the host interface
+ * @length: size of the buffer
+ *
+ * Writes the DHCP information to the host interface.
+ **/
+s32 e1000e_mng_write_dhcp_info(struct e1000_hw *hw, u8 *buffer, u16 length)
+{
+ struct e1000_host_mng_command_header hdr;
+ s32 ret_val;
+ u32 hicr;
+
+ hdr.command_id = E1000_MNG_DHCP_TX_PAYLOAD_CMD;
+ hdr.command_length = length;
+ hdr.reserved1 = 0;
+ hdr.reserved2 = 0;
+ hdr.checksum = 0;
+
+ /* Enable the host interface */
+ ret_val = e1000_mng_enable_host_if(hw);
+ if (ret_val)
+ return ret_val;
+
+ /* Populate the host interface with the contents of "buffer". */
+ ret_val = e1000_mng_host_if_write(hw, buffer, length,
+ sizeof(hdr), &(hdr.checksum));
+ if (ret_val)
+ return ret_val;
+
+ /* Write the manageability command header */
+ ret_val = e1000_mng_write_cmd_header(hw, &hdr);
+ if (ret_val)
+ return ret_val;
+
+ /* Tell the ARC a new command is pending. */
+ hicr = er32(HICR);
+ ew32(HICR, hicr | E1000_HICR_C);
+
+ return 0;
+}
+
+/**
+ * e1000e_enable_mng_pass_thru - Check if management passthrough is needed
+ * @hw: pointer to the HW structure
+ *
+ * Verifies the hardware needs to leave interface enabled so that frames can
+ * be directed to and from the management interface.
+ **/
+bool e1000e_enable_mng_pass_thru(struct e1000_hw *hw)
+{
+ u32 manc;
+ u32 fwsm, factps;
+
+ manc = er32(MANC);
+
+ if (!(manc & E1000_MANC_RCV_TCO_EN))
+ return false;
+
+ if (hw->mac.has_fwsm) {
+ fwsm = er32(FWSM);
+ factps = er32(FACTPS);
+
+ if (!(factps & E1000_FACTPS_MNGCG) &&
+ ((fwsm & E1000_FWSM_MODE_MASK) ==
+ (e1000_mng_mode_pt << E1000_FWSM_MODE_SHIFT)))
+ return true;
+ } else if ((hw->mac.type == e1000_82574) ||
+ (hw->mac.type == e1000_82583)) {
+ u16 data;
+ s32 ret_val;
+
+ factps = er32(FACTPS);
+ ret_val = e1000_read_nvm(hw, NVM_INIT_CONTROL2_REG, 1, &data);
+ if (ret_val)
+ return false;
+
+ if (!(factps & E1000_FACTPS_MNGCG) &&
+ ((data & E1000_NVM_INIT_CTRL2_MNGM) ==
+ (e1000_mng_mode_pt << 13)))
+ return true;
+ } else if ((manc & E1000_MANC_SMBUS_EN) &&
+ !(manc & E1000_MANC_ASF_EN)) {
+ return true;
+ }
+
+ return false;
+}
Code Review / kvmfornfv.git / blobdiff