From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jingjing Wu Subject: [PATCH v2 14/16] net/i40e/base: add EEPROM checksum verification Date: Mon, 26 Jun 2017 17:48:57 +0800 Message-ID: <1498470539-26921-15-git-send-email-jingjing.wu@intel.com> References: <1495856866-89539-1-git-send-email-jingjing.wu@intel.com> <1498470539-26921-1-git-send-email-jingjing.wu@intel.com> Cc: dev@dpdk.org, jingjing.wu@intel.com To: helin.zhang@intel.com Return-path: Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by dpdk.org (Postfix) with ESMTP id 51AC258F6 for ; Mon, 26 Jun 2017 11:54:34 +0200 (CEST) In-Reply-To: <1498470539-26921-1-git-send-email-jingjing.wu@intel.com> List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org Sender: "dev" This patch ensures PFs mutually exclusive access to NVM. Signed-off-by: Jingjing Wu --- drivers/net/i40e/base/i40e_nvm.c | 14 ++++++++++---- 1 file changed, 10 insertions(+), 4 deletions(-) diff --git a/drivers/net/i40e/base/i40e_nvm.c b/drivers/net/i40e/base/i40e_nvm.c index 90521fa..a1e7830 100644 --- a/drivers/net/i40e/base/i40e_nvm.c +++ b/drivers/net/i40e/base/i40e_nvm.c @@ -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 { -- 2.4.11