netdev - [net-next 07/14] igb: Do not factor VLANs into RLPML calculation

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Date:	Mon, 15 Feb 2016 19:21:48 -0800
From:	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
To:	davem@...emloft.net
Cc:	Alexander Duyck <aduyck@...antis.com>, netdev@...r.kernel.org,
	nhorman@...hat.com, sassmann@...hat.com, jogreene@...hat.com,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: [net-next 07/14] igb: Do not factor VLANs into RLPML calculation

From: Alexander Duyck <aduyck@...antis.com>

The RLPML registers already take the size of VLAN headers into account when
determining the maximum packet length.  This is called out in EAS documents
for several parts including the 82576 and the i350.  As such we can drop
the addition of size to the value programmed into the RLPML registers.

Signed-off-by: Alexander Duyck <aduyck@...antis.com>
Tested-by: Aaron Brown <aaron.f.brown@...el.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
---
 drivers/net/ethernet/intel/igb/igb.h      |  1 -
 drivers/net/ethernet/intel/igb/igb_main.c | 43 ++-----------------------------
 2 files changed, 2 insertions(+), 42 deletions(-)

diff --git a/drivers/net/ethernet/intel/igb/igb.h b/drivers/net/ethernet/intel/igb/igb.h
index e3cb93b..d135261 100644
--- a/drivers/net/ethernet/intel/igb/igb.h
+++ b/drivers/net/ethernet/intel/igb/igb.h
@@ -95,7 +95,6 @@ struct vf_data_storage {
 	unsigned char vf_mac_addresses[ETH_ALEN];
 	u16 vf_mc_hashes[IGB_MAX_VF_MC_ENTRIES];
 	u16 num_vf_mc_hashes;
-	u16 vlans_enabled;
 	u32 flags;
 	unsigned long last_nack;
 	u16 pf_vlan; /* When set, guest VLAN config not allowed. */
diff --git a/drivers/net/ethernet/intel/igb/igb_main.c b/drivers/net/ethernet/intel/igb/igb_main.c
index b676881..9461480 100644
--- a/drivers/net/ethernet/intel/igb/igb_main.c
+++ b/drivers/net/ethernet/intel/igb/igb_main.c
@@ -3531,12 +3531,8 @@ static inline int igb_set_vf_rlpml(struct igb_adapter *adapter, int size,
 	struct e1000_hw *hw = &adapter->hw;
 	u32 vmolr;
 
-	/* if it isn't the PF check to see if VFs are enabled and
-	 * increase the size to support vlan tags
-	 */
-	if (vfn < adapter->vfs_allocated_count &&
-	    adapter->vf_data[vfn].vlans_enabled)
-		size += VLAN_TAG_SIZE;
+	if (size > MAX_JUMBO_FRAME_SIZE)
+		size = MAX_JUMBO_FRAME_SIZE;
 
 	vmolr = rd32(E1000_VMOLR(vfn));
 	vmolr &= ~E1000_VMOLR_RLPML_MASK;
@@ -5787,8 +5783,6 @@ static void igb_clear_vf_vfta(struct igb_adapter *adapter, u32 vf)
 
 		wr32(E1000_VLVF(i), reg);
 	}
-
-	adapter->vf_data[vf].vlans_enabled = 0;
 }
 
 static s32 igb_vlvf_set(struct igb_adapter *adapter, u32 vid, bool add, u32 vf)
@@ -5837,23 +5831,6 @@ static s32 igb_vlvf_set(struct igb_adapter *adapter, u32 vid, bool add, u32 vf)
 			reg &= ~E1000_VLVF_VLANID_MASK;
 			reg |= vid;
 			wr32(E1000_VLVF(i), reg);
-
-			/* do not modify RLPML for PF devices */
-			if (vf >= adapter->vfs_allocated_count)
-				return 0;
-
-			if (!adapter->vf_data[vf].vlans_enabled) {
-				u32 size;
-
-				reg = rd32(E1000_VMOLR(vf));
-				size = reg & E1000_VMOLR_RLPML_MASK;
-				size += 4;
-				reg &= ~E1000_VMOLR_RLPML_MASK;
-				reg |= size;
-				wr32(E1000_VMOLR(vf), reg);
-			}
-
-			adapter->vf_data[vf].vlans_enabled++;
 		}
 	} else {
 		if (i < E1000_VLVF_ARRAY_SIZE) {
@@ -5865,22 +5842,6 @@ static s32 igb_vlvf_set(struct igb_adapter *adapter, u32 vid, bool add, u32 vf)
 				igb_vfta_set(hw, vid, false);
 			}
 			wr32(E1000_VLVF(i), reg);
-
-			/* do not modify RLPML for PF devices */
-			if (vf >= adapter->vfs_allocated_count)
-				return 0;
-
-			adapter->vf_data[vf].vlans_enabled--;
-			if (!adapter->vf_data[vf].vlans_enabled) {
-				u32 size;
-
-				reg = rd32(E1000_VMOLR(vf));
-				size = reg & E1000_VMOLR_RLPML_MASK;
-				size -= 4;
-				reg &= ~E1000_VMOLR_RLPML_MASK;
-				reg |= size;
-				wr32(E1000_VMOLR(vf), reg);
-			}
 		}
 	}
 	return 0;
-- 
2.5.0