linux-kernel - [PATCH net] i40e: Fix firmware version comparison function

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Date: Wed, 28 Feb 2024 18:26:03 +0100
From: Ivan Vecera <ivecera@...hat.com>
To: netdev@...r.kernel.org
Cc: mschmidt@...hat.com,
	Jesse Brandeburg <jesse.brandeburg@...el.com>,
	Tony Nguyen <anthony.l.nguyen@...el.com>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	intel-wired-lan@...ts.osuosl.org (moderated list:INTEL ETHERNET DRIVERS),
	linux-kernel@...r.kernel.org (open list)
Subject: [PATCH net] i40e: Fix firmware version comparison function

Helper i40e_is_fw_ver_eq() compares incorrectly given firmware version
as it returns true when the major version of running firmware is
greater than the given major version that is wrong and results in
failure during getting of DCB configuration where this helper is used.
Fix the check and return true only if the running FW version is exactly
equals to the given version.

Reproducer:
1. Load i40e driver
2. Check dmesg output

[root@...t ~]# modprobe i40e
[root@...t ~]# dmesg | grep 'i40e.*DCB'
[   74.750642] i40e 0000:02:00.0: Query for DCB configuration failed, err -EIO aq_err I40E_AQ_RC_EINVAL
[   74.759770] i40e 0000:02:00.0: DCB init failed -5, disabled
[   74.966550] i40e 0000:02:00.1: Query for DCB configuration failed, err -EIO aq_err I40E_AQ_RC_EINVAL
[   74.975683] i40e 0000:02:00.1: DCB init failed -5, disabled

Fixes: cf488e13221f ("i40e: Add other helpers to check version of running firmware and AQ API")
Signed-off-by: Ivan Vecera <ivecera@...hat.com>
---
 drivers/net/ethernet/intel/i40e/i40e_prototype.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/intel/i40e/i40e_prototype.h b/drivers/net/ethernet/intel/i40e/i40e_prototype.h
index af4269330581..ce1f11b8ad65 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_prototype.h
+++ b/drivers/net/ethernet/intel/i40e/i40e_prototype.h
@@ -567,8 +567,7 @@ static inline bool i40e_is_fw_ver_lt(struct i40e_hw *hw, u16 maj, u16 min)
  **/
 static inline bool i40e_is_fw_ver_eq(struct i40e_hw *hw, u16 maj, u16 min)
 {
-	return (hw->aq.fw_maj_ver > maj ||
-		(hw->aq.fw_maj_ver == maj && hw->aq.fw_min_ver == min));
+	return (hw->aq.fw_maj_ver == maj && hw->aq.fw_min_ver == min);
 }
 
 #endif /* _I40E_PROTOTYPE_H_ */
-- 
2.43.0