diff mbox series

[net,5/7] ice: Don't allow more channels than LAN MSI-X available

Message ID 20210122235734.447240-6-anthony.l.nguyen@intel.com (mailing list archive)
State Changes Requested
Delegated to: Netdev Maintainers
Headers show
Series Intel Wired LAN Driver Updates 2021-01-22 | expand

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netdev/cc_maintainers warning 5 maintainers not CCed: jeffrey.t.kirsher@intel.com intel-wired-lan@lists.osuosl.org henry.w.tieman@intel.com jesse.brandeburg@intel.com maciej.fijalkowski@intel.com
netdev/source_inline success Was 0 now: 0
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netdev/module_param success Was 0 now: 0
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netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 20 lines checked
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
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netdev/stable success Stable not CCed

Commit Message

Tony Nguyen Jan. 22, 2021, 11:57 p.m. UTC 
From: Brett Creeley <brett.creeley@intel.com>

Currently users could create more channels than LAN MSI-X available.
This is happening because there is no check against pf->num_lan_msix
when checking the max allowed channels and will cause performance issues
if multiple Tx and Rx queues are tied to a single MSI-X. Fix this by not
allowing more channels than LAN MSI-X available in pf->num_lan_msix.

Fixes: 87324e747fde ("ice: Implement ethtool ops for channels")
Signed-off-by: Brett Creeley <brett.creeley@intel.com>
Tested-by: Tony Brelinski <tonyx.brelinski@intel.com>
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
---
 drivers/net/ethernet/intel/ice/ice_ethtool.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/intel/ice/ice_ethtool.c b/drivers/net/ethernet/intel/ice/ice_ethtool.c
index 9e8e9531cd87..69c113a4de7e 100644
--- a/drivers/net/ethernet/intel/ice/ice_ethtool.c
+++ b/drivers/net/ethernet/intel/ice/ice_ethtool.c
@@ -3258,8 +3258,8 @@  ice_set_rxfh(struct net_device *netdev, const u32 *indir, const u8 *key,
  */
 static int ice_get_max_txq(struct ice_pf *pf)
 {
-	return min_t(int, num_online_cpus(),
-		     pf->hw.func_caps.common_cap.num_txq);
+	return min3(pf->num_lan_msix, (u16)num_online_cpus(),
+		    (u16)pf->hw.func_caps.common_cap.num_txq);
 }
 
 /**
@@ -3268,8 +3268,8 @@  static int ice_get_max_txq(struct ice_pf *pf)
  */
 static int ice_get_max_rxq(struct ice_pf *pf)
 {
-	return min_t(int, num_online_cpus(),
-		     pf->hw.func_caps.common_cap.num_rxq);
+	return min3(pf->num_lan_msix, (u16)num_online_cpus(),
+		    (u16)pf->hw.func_caps.common_cap.num_rxq);
 }
 
 /**