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i40e: ShadowRAM checksum calculation change

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Due to changes in FW the SW is required to perform double SR dump in
some cases.

Implementation adds two new steps to update nvm checksum function:
* recalculate checksum and check if checksum in NVM is correct
* if checksum in NVM is not correct then update it again

Signed-off-by: Maciej Paczkowski <maciej.paczkowski@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
This commit is contained in:
Maciej Paczkowski 2019-02-28 09:52:50 -08:00 committed by Jeff Kirsher
parent 5a189f1550
commit 226436dc8a
1 changed files with 25 additions and 4 deletions
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25
drivers/net/ethernet/intel/i40e/i40e_nvm.c
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@ -574,14 +574,35 @@ i40e_calc_nvm_checksum_exit:
i40e_status i40e_update_nvm_checksum(struct i40e_hw *hw)
{
i40e_status ret_code;
u16 checksum;
u16 checksum, checksum_sr;
__le16 le_sum;
ret_code = i40e_calc_nvm_checksum(hw, &checksum);
if (!ret_code) {
if (ret_code)
return ret_code;
le_sum = cpu_to_le16(checksum);
ret_code = i40e_write_nvm_aq(hw, 0x00, I40E_SR_SW_CHECKSUM_WORD,
1, &le_sum, true);
if (ret_code)
return ret_code;
/* Due to changes in FW the SW is required to perform double SR-dump
* in some cases. SR-dump is the process when internal shadow RAM is
* dumped into flash bank. It is triggered by setting "last_command"
* argument in i40e_write_nvm_aq function call.
* Since FW 1.8 we need to calculate SR checksum again and update it
* in flash if it is not equal to previously computed checksum.
* This situation would occur only in FW >= 1.8
*/
ret_code = i40e_calc_nvm_checksum(hw, &checksum_sr);
if (ret_code)
return ret_code;
if (checksum_sr != checksum) {
le_sum = cpu_to_le16(checksum_sr);
ret_code = i40e_write_nvm_aq(hw, 0x00,
I40E_SR_SW_CHECKSUM_WORD,
1, &le_sum, true);
}
return ret_code;