/**
* e1000_enable_tx_pkt_filtering_generic - 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 e1000_enable_tx_pkt_filtering_generic(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;
bool tx_filter = TRUE;
DEBUGFUNC("e1000_enable_tx_pkt_filtering_generic");
/* No manageability, no filtering */
if (!hw->mac.ops.check_mng_mode(hw)) {
tx_filter = FALSE;
goto out;
}
/*
* If we can't read from the host interface for whatever
* reason, disable filtering.
*/
ret_val = hw->mac.ops.mng_enable_host_if(hw);
if (ret_val != E1000_SUCCESS) {
tx_filter = FALSE;
goto out;
}
/* 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_DWORD(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)
goto out;
if (hdr->signature != E1000_IAMT_SIGNATURE)
goto out;
/* Cookie area is valid, make the final check for filtering. */
if (!(hdr->status & E1000_MNG_DHCP_COOKIE_STATUS_PARSING))
tx_filter = FALSE;
out:
hw->mac.tx_pkt_filtering = tx_filter;
return tx_filter;
}
/**
* 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.
**/
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_write_cmd_header_generic - 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.
**/
s32 e1000_mng_write_cmd_header_generic(struct e1000_hw * hw,
struct e1000_host_mng_command_header * hdr)
{
u16 i, length = sizeof(struct e1000_host_mng_command_header);
DEBUGFUNC("e1000_mng_write_cmd_header_generic");
/* 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_DWORD(hw, E1000_HOST_IF, i,
*((u32 *) hdr + i));
E1000_WRITE_FLUSH(hw);
}
return E1000_SUCCESS;
}
