[dpdk-dev,v4,14/17] net/i40e/base: add EEPROM checksum verification
Checks
Commit Message
This patch ensures PFs mutually exclusive access to NVM.
Signed-off-by: Jingjing Wu <jingjing.wu@intel.com>
---
drivers/net/i40e/base/i40e_nvm.c | 14 ++++++++++----
1 file changed, 10 insertions(+), 4 deletions(-)
@@ -749,12 +749,18 @@ enum i40e_status_code i40e_validate_nvm_checksum(struct i40e_hw *hw,
DEBUGFUNC("i40e_validate_nvm_checksum");
- if (hw->flags & I40E_HW_FLAG_AQ_SRCTL_ACCESS_ENABLE)
- ret_code = i40e_acquire_nvm(hw, I40E_RESOURCE_READ);
+ /* acquire_nvm provides exclusive NVM lock to synchronize access across
+ * PFs. X710 uses i40e_read_nvm_word_srctl which polls for done bit
+ * twice (first time to be able to write address to I40E_GLNVM_SRCTL
+ * register, second to read data from I40E_GLNVM_SRDATA. One PF can see
+ * done bit and try to write address, while another one will interpret
+ * it as a good time to read data. It will cause invalid data to be
+ * read.
+ */
+ ret_code = i40e_acquire_nvm(hw, I40E_RESOURCE_READ);
if (!ret_code) {
ret_code = i40e_calc_nvm_checksum(hw, &checksum_local);
- if (hw->flags & I40E_HW_FLAG_AQ_SRCTL_ACCESS_ENABLE)
- i40e_release_nvm(hw);
+ i40e_release_nvm(hw);
if (ret_code != I40E_SUCCESS)
goto i40e_validate_nvm_checksum_exit;
} else {