igb: add pf side of VMDq support

Add the pf portion of vmdq support.  This provides enough support so that
VMDq is enabled, and the pf is functional without enabling vfs.

Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 159 insertions, 15 deletions

diff --git a/drivers/net/igb/igb_main.c b/drivers/net/igb/igb_main.c
index 0dcc0c109b9..c7c7eeba336 100644
--- a/drivers/net/igb/igb_main.c
+++ b/drivers/net/igb/igb_main.c
@@ -122,6 +122,10 @@ static void igb_vlan_rx_register(struct net_device *, struct vlan_group *);
 static void igb_vlan_rx_add_vid(struct net_device *, u16);
 static void igb_vlan_rx_kill_vid(struct net_device *, u16);
 static void igb_restore_vlan(struct igb_adapter *);
+static inline void igb_set_rah_pool(struct e1000_hw *, int , int);
+static void igb_set_mc_list_pools(struct igb_adapter *, int, u16);
+static inline void igb_set_vmolr(struct e1000_hw *, int);
+static inline void igb_set_vf_rlpml(struct igb_adapter *, int, int);
 
 static int igb_suspend(struct pci_dev *, pm_message_t);
 #ifdef CONFIG_PM
@@ -888,6 +892,9 @@ int igb_up(struct igb_adapter *adapter)
 	if (adapter->msix_entries)
 		igb_configure_msix(adapter);
 
+	igb_set_rah_pool(hw, adapter->vfs_allocated_count, 0);
+	igb_set_vmolr(hw, adapter->vfs_allocated_count);
+
 	/* Clear any pending interrupts. */
 	rd32(E1000_ICR);
 	igb_irq_enable(adapter);
@@ -1617,6 +1624,9 @@ static int igb_open(struct net_device *netdev)
 	 * clean_rx handler before we do so.  */
 	igb_configure(adapter);
 
+	igb_set_rah_pool(hw, adapter->vfs_allocated_count, 0);
+	igb_set_vmolr(hw, adapter->vfs_allocated_count);
+
 	err = igb_request_irq(adapter);
 	if (err)
 		goto err_req_irq;
@@ -1797,10 +1807,11 @@ static void igb_configure_tx(struct igb_adapter *adapter)
 		wr32(E1000_DCA_TXCTRL(j), txctrl);
 	}
 
-	/* Use the default values for the Tx Inter Packet Gap (IPG) timer */
+	/* disable queue 0 to prevent tail bump w/o re-configuration */
+	if (adapter->vfs_allocated_count)
+		wr32(E1000_TXDCTL(0), 0);
 
 	/* Program the Transmit Control Register */
-
 	tctl = rd32(E1000_TCTL);
 	tctl &= ~E1000_TCTL_CT;
 	tctl |= E1000_TCTL_PSP | E1000_TCTL_RTLC |
@@ -1954,6 +1965,30 @@ static void igb_setup_rctl(struct igb_adapter *adapter)
 		srrctl |= E1000_SRRCTL_DESCTYPE_ADV_ONEBUF;
 	}
 
+	/* Attention!!!  For SR-IOV PF driver operations you must enable
+	 * queue drop for all VF and PF queues to prevent head of line blocking
+	 * if an un-trusted VF does not provide descriptors to hardware.
+	 */
+	if (adapter->vfs_allocated_count) {
+		u32 vmolr;
+
+		j = adapter->rx_ring[0].reg_idx;
+
+		/* set all queue drop enable bits */
+		wr32(E1000_QDE, ALL_QUEUES);
+		srrctl |= E1000_SRRCTL_DROP_EN;
+
+		/* disable queue 0 to prevent tail write w/o re-config */
+		wr32(E1000_RXDCTL(0), 0);
+
+		vmolr = rd32(E1000_VMOLR(j));
+		if (rctl & E1000_RCTL_LPE)
+			vmolr |= E1000_VMOLR_LPE;
+		if (adapter->num_rx_queues > 0)
+			vmolr |= E1000_VMOLR_RSSE;
+		wr32(E1000_VMOLR(j), vmolr);
+	}
+
 	for (i = 0; i < adapter->num_rx_queues; i++) {
 		j = adapter->rx_ring[i].reg_idx;
 		wr32(E1000_SRRCTL(j), srrctl);
@@ -1963,6 +1998,54 @@ static void igb_setup_rctl(struct igb_adapter *adapter)
 }
 
 /**
+ * igb_rlpml_set - set maximum receive packet size
+ * @adapter: board private structure
+ *
+ * Configure maximum receivable packet size.
+ **/
+static void igb_rlpml_set(struct igb_adapter *adapter)
+{
+	u32 max_frame_size = adapter->max_frame_size;
+	struct e1000_hw *hw = &adapter->hw;
+	u16 pf_id = adapter->vfs_allocated_count;
+
+	if (adapter->vlgrp)
+		max_frame_size += VLAN_TAG_SIZE;
+
+	/* if vfs are enabled we set RLPML to the largest possible request
+	 * size and set the VMOLR RLPML to the size we need */
+	if (pf_id) {
+		igb_set_vf_rlpml(adapter, max_frame_size, pf_id);
+		max_frame_size = MAX_STD_JUMBO_FRAME_SIZE + VLAN_TAG_SIZE;
+	}
+
+	wr32(E1000_RLPML, max_frame_size);
+}
+
+/**
+ * igb_configure_vt_default_pool - Configure VT default pool
+ * @adapter: board private structure
+ *
+ * Configure the default pool
+ **/
+static void igb_configure_vt_default_pool(struct igb_adapter *adapter)
+{
+	struct e1000_hw *hw = &adapter->hw;
+	u16 pf_id = adapter->vfs_allocated_count;
+	u32 vtctl;
+
+	/* not in sr-iov mode - do nothing */
+	if (!pf_id)
+		return;
+
+	vtctl = rd32(E1000_VT_CTL);
+	vtctl &= ~(E1000_VT_CTL_DEFAULT_POOL_MASK |
+		   E1000_VT_CTL_DISABLE_DEF_POOL);
+	vtctl |= pf_id << E1000_VT_CTL_DEFAULT_POOL_SHIFT;
+	wr32(E1000_VT_CTL, vtctl);
+}
+
+/**
  * igb_configure_rx - Configure receive Unit after Reset
  * @adapter: board private structure
  *
@@ -2033,8 +2116,10 @@ static void igb_configure_rx(struct igb_adapter *adapter)
 				writel(reta.dword,
 				       hw->hw_addr + E1000_RETA(0) + (j & ~3));
 		}
-
-		mrqc = E1000_MRQC_ENABLE_RSS_4Q;
+		if (adapter->vfs_allocated_count)
+			mrqc = E1000_MRQC_ENABLE_VMDQ_RSS_2Q;
+		else
+			mrqc = E1000_MRQC_ENABLE_RSS_4Q;
 
 		/* Fill out hash function seeds */
 		for (j = 0; j < 10; j++)
@@ -2059,6 +2144,9 @@ static void igb_configure_rx(struct igb_adapter *adapter)
 		rxcsum |= E1000_RXCSUM_PCSD;
 		wr32(E1000_RXCSUM, rxcsum);
 	} else {
+		/* Enable multi-queue for sr-iov */
+		if (adapter->vfs_allocated_count)
+			wr32(E1000_MRQC, E1000_MRQC_ENABLE_VMDQ);
 		/* Enable Receive Checksum Offload for TCP and UDP */
 		rxcsum = rd32(E1000_RXCSUM);
 		if (adapter->rx_csum)
@@ -2069,11 +2157,10 @@ static void igb_configure_rx(struct igb_adapter *adapter)
 		wr32(E1000_RXCSUM, rxcsum);
 	}
 
-	if (adapter->vlgrp)
-		wr32(E1000_RLPML,
-				adapter->max_frame_size + VLAN_TAG_SIZE);
-	else
-		wr32(E1000_RLPML, adapter->max_frame_size);
+	/* Set the default pool for the PF's first queue */
+	igb_configure_vt_default_pool(adapter);
+
+	igb_rlpml_set(adapter);
 
 	/* Enable Receives */
 	wr32(E1000_RCTL, rctl);
@@ -2303,6 +2390,8 @@ static int igb_set_mac(struct net_device *netdev, void *p)
 
 	hw->mac.ops.rar_set(hw, hw->mac.addr, 0);
 
+	igb_set_rah_pool(hw, adapter->vfs_allocated_count, 0);
+
 	return 0;
 }
 
@@ -2362,7 +2451,11 @@ static void igb_set_multi(struct net_device *netdev)
 		memcpy(mta_list + (i*ETH_ALEN), mc_ptr->dmi_addr, ETH_ALEN);
 		mc_ptr = mc_ptr->next;
 	}
-	igb_update_mc_addr_list(hw, mta_list, i, 1, mac->rar_entry_count);
+	igb_update_mc_addr_list(hw, mta_list, i,
+	                        adapter->vfs_allocated_count + 1,
+	                        mac->rar_entry_count);
+
+	igb_set_mc_list_pools(adapter, i, mac->rar_entry_count);
 	kfree(mta_list);
 }
 
@@ -3222,7 +3315,6 @@ static int igb_change_mtu(struct net_device *netdev, int new_mtu)
 		return -EINVAL;
 	}
 
-#define MAX_STD_JUMBO_FRAME_SIZE 9234
 	if (max_frame > MAX_STD_JUMBO_FRAME_SIZE) {
 		dev_err(&adapter->pdev->dev, "MTU > 9216 not supported.\n");
 		return -EINVAL;
@@ -3256,6 +3348,12 @@ static int igb_change_mtu(struct net_device *netdev, int new_mtu)
 #else
 		adapter->rx_buffer_len = PAGE_SIZE / 2;
 #endif
+
+	/* if sr-iov is enabled we need to force buffer size to 1K or larger */
+	if (adapter->vfs_allocated_count &&
+	    (adapter->rx_buffer_len < IGB_RXBUFFER_1024))
+		adapter->rx_buffer_len = IGB_RXBUFFER_1024;
+
 	/* adjust allocation if LPE protects us, and we aren't using SBP */
 	if ((max_frame == ETH_FRAME_LEN + ETH_FCS_LEN) ||
 	     (max_frame == MAXIMUM_ETHERNET_VLAN_SIZE))
@@ -4462,8 +4560,6 @@ static void igb_vlan_rx_register(struct net_device *netdev,
 		rctl &= ~E1000_RCTL_CFIEN;
 		wr32(E1000_RCTL, rctl);
 		igb_update_mng_vlan(adapter);
-		wr32(E1000_RLPML,
-				adapter->max_frame_size + VLAN_TAG_SIZE);
 	} else {
 		/* disable VLAN tag insert/strip */
 		ctrl = rd32(E1000_CTRL);
@@ -4474,10 +4570,10 @@ static void igb_vlan_rx_register(struct net_device *netdev,
 			igb_vlan_rx_kill_vid(netdev, adapter->mng_vlan_id);
 			adapter->mng_vlan_id = IGB_MNG_VLAN_NONE;
 		}
-		wr32(E1000_RLPML,
-				adapter->max_frame_size);
 	}
 
+	igb_rlpml_set(adapter);
+
 	if (!test_bit(__IGB_DOWN, &adapter->state))
 		igb_irq_enable(adapter);
 }
@@ -4841,4 +4937,52 @@ static void igb_io_resume(struct pci_dev *pdev)
 	igb_get_hw_control(adapter);
 }
 
+static inline void igb_set_vmolr(struct e1000_hw *hw, int vfn)
+{
+	u32 reg_data;
+
+	reg_data = rd32(E1000_VMOLR(vfn));
+	reg_data |= E1000_VMOLR_BAM |	 /* Accept broadcast */
+	            E1000_VMOLR_ROPE |   /* Accept packets matched in UTA */
+	            E1000_VMOLR_ROMPE |  /* Accept packets matched in MTA */
+	            E1000_VMOLR_AUPE |   /* Accept untagged packets */
+	            E1000_VMOLR_STRVLAN; /* Strip vlan tags */
+	wr32(E1000_VMOLR(vfn), reg_data);
+}
+
+static inline void igb_set_vf_rlpml(struct igb_adapter *adapter, int size,
+                                    int vfn)
+{
+	struct e1000_hw *hw = &adapter->hw;
+	u32 vmolr;
+
+	vmolr = rd32(E1000_VMOLR(vfn));
+	vmolr &= ~E1000_VMOLR_RLPML_MASK;
+	vmolr |= size | E1000_VMOLR_LPE;
+	wr32(E1000_VMOLR(vfn), vmolr);
+}
+
+static inline void igb_set_rah_pool(struct e1000_hw *hw, int pool, int entry)
+{
+	u32 reg_data;
+
+	reg_data = rd32(E1000_RAH(entry));
+	reg_data &= ~E1000_RAH_POOL_MASK;
+	reg_data |= E1000_RAH_POOL_1 << pool;;
+	wr32(E1000_RAH(entry), reg_data);
+}
+
+static void igb_set_mc_list_pools(struct igb_adapter *adapter,
+				  int entry_count, u16 total_rar_filters)
+{
+	struct e1000_hw *hw = &adapter->hw;
+	int i = adapter->vfs_allocated_count + 1;
+
+	if ((i + entry_count) < total_rar_filters)
+		total_rar_filters = i + entry_count;
+
+	for (; i < total_rar_filters; i++)
+		igb_set_rah_pool(hw, adapter->vfs_allocated_count, i);
+}
+
 /* igb_main.c */