[dpdk-dev] [PATCH v3 11/24] net/i40e/base: fix NVM lock

[Qi Zhang]

NVM lock is only required at below situation:
1. its X722 device or
2. API version >= 1.5
or may have issue at firmware downgrade.

Fixes: c5846a125b26 ("net/i40e/base: fix NVM access interfering")
Cc: stable at dpdk.org

Signed-off-by: Qi Zhang <qi.z.zhang at intel.com>
---
 drivers/net/i40e/base/i40e_adminq.c | 6 ++++++
 drivers/net/i40e/base/i40e_common.c | 3 ++-
 drivers/net/i40e/base/i40e_nvm.c    | 7 +++++--
 drivers/net/i40e/base/i40e_type.h   | 1 +
 4 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/net/i40e/base/i40e_adminq.c b/drivers/net/i40e/base/i40e_adminq.c
index 8cc8c5eca..109d4cf6c 100644
--- a/drivers/net/i40e/base/i40e_adminq.c
+++ b/drivers/net/i40e/base/i40e_adminq.c
@@ -694,6 +694,12 @@ enum i40e_status_code i40e_init_adminq(struct i40e_hw *hw)
 		hw->flags |= I40E_HW_FLAG_AQ_PHY_ACCESS_CAPABLE;
 	}
 
+	/* Newer versions of firmware require lock when reading the NVM */
+	if ((hw->aq.api_maj_ver > 1) ||
+	    ((hw->aq.api_maj_ver == 1) &&
+	     (hw->aq.api_min_ver >= 5)))
+		hw->flags |= I40E_HW_FLAG_NVM_READ_REQUIRES_LOCK;
+
 	if (hw->aq.api_maj_ver > I40E_FW_API_VERSION_MAJOR) {
 		ret_code = I40E_ERR_FIRMWARE_API_VERSION;
 		goto init_adminq_free_arq;
diff --git a/drivers/net/i40e/base/i40e_common.c b/drivers/net/i40e/base/i40e_common.c
index f085e3a99..8158c7c10 100644
--- a/drivers/net/i40e/base/i40e_common.c
+++ b/drivers/net/i40e/base/i40e_common.c
@@ -1037,7 +1037,8 @@ enum i40e_status_code i40e_init_shared_code(struct i40e_hw *hw)
 		hw->pf_id = (u8)(func_rid & 0x7);
 
 	if (hw->mac.type == I40E_MAC_X722)
-		hw->flags |= I40E_HW_FLAG_AQ_SRCTL_ACCESS_ENABLE;
+		hw->flags |= I40E_HW_FLAG_AQ_SRCTL_ACCESS_ENABLE |
+			     I40E_HW_FLAG_NVM_READ_REQUIRES_LOCK;
 
 	status = i40e_init_nvm(hw);
 	return status;
diff --git a/drivers/net/i40e/base/i40e_nvm.c b/drivers/net/i40e/base/i40e_nvm.c
index 946778ba3..fec35a887 100644
--- a/drivers/net/i40e/base/i40e_nvm.c
+++ b/drivers/net/i40e/base/i40e_nvm.c
@@ -219,14 +219,17 @@ enum i40e_status_code i40e_read_nvm_word(struct i40e_hw *hw, u16 offset,
 {
 	enum i40e_status_code ret_code = I40E_SUCCESS;
 
-	ret_code = i40e_acquire_nvm(hw, I40E_RESOURCE_READ);
+	if (hw->flags & I40E_HW_FLAG_NVM_READ_REQUIRES_LOCK)
+		ret_code = i40e_acquire_nvm(hw, I40E_RESOURCE_READ);
+
 	if (!ret_code) {
 		if (hw->flags & I40E_HW_FLAG_AQ_SRCTL_ACCESS_ENABLE) {
 			ret_code = i40e_read_nvm_word_aq(hw, offset, data);
 		} else {
 			ret_code = i40e_read_nvm_word_srctl(hw, offset, data);
 		}
-		i40e_release_nvm(hw);
+		if (hw->flags & I40E_HW_FLAG_NVM_READ_REQUIRES_LOCK)
+			i40e_release_nvm(hw);
 	}
 	return ret_code;
 }
diff --git a/drivers/net/i40e/base/i40e_type.h b/drivers/net/i40e/base/i40e_type.h
index 438e70678..23ccd1eb4 100644
--- a/drivers/net/i40e/base/i40e_type.h
+++ b/drivers/net/i40e/base/i40e_type.h
@@ -722,6 +722,7 @@ struct i40e_hw {
 #define I40E_HW_FLAG_AQ_SRCTL_ACCESS_ENABLE BIT_ULL(0)
 #define I40E_HW_FLAG_802_1AD_CAPABLE        BIT_ULL(1)
 #define I40E_HW_FLAG_AQ_PHY_ACCESS_CAPABLE  BIT_ULL(2)
+#define I40E_HW_FLAG_NVM_READ_REQUIRES_LOCK BIT_ULL(3)
 	u64 flags;
 
 	/* Used in set switch config AQ command */
-- 
2.14.1