ixgbe: Add SR-IOV specific features

This module and header file add functions to support SR-IOV features of the
82599 10Gbe controller.

Signed-off-by: Greg Rose <gregory.v.rose@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 336 insertions, 0 deletions

diff --git a/drivers/net/ixgbe/ixgbe_sriov.c b/drivers/net/ixgbe/ixgbe_sriov.c
new file mode 100644
index 00000000000..74bca74d57c
--- /dev/null
+++ b/drivers/net/ixgbe/ixgbe_sriov.c
@@ -0,0 +1,336 @@
+/*******************************************************************************
+
+  Intel 10 Gigabit PCI Express Linux driver
+  Copyright(c) 1999 - 2009 Intel Corporation.
+
+  This program is free software; you can redistribute it and/or modify it
+  under the terms and conditions of the GNU General Public License,
+  version 2, as published by the Free Software Foundation.
+
+  This program is distributed in the hope it will be useful, but WITHOUT
+  ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+  more details.
+
+  You should have received a copy of the GNU General Public License along with
+  this program; if not, write to the Free Software Foundation, Inc.,
+  51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
+
+  The full GNU General Public License is included in this distribution in
+  the file called "COPYING".
+
+  Contact Information:
+  e1000-devel Mailing List <e1000-devel@lists.sourceforge.net>
+  Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
+
+*******************************************************************************/
+
+
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/netdevice.h>
+#include <linux/vmalloc.h>
+#include <linux/string.h>
+#include <linux/in.h>
+#include <linux/ip.h>
+#include <linux/tcp.h>
+#include <linux/ipv6.h>
+#ifdef NETIF_F_HW_VLAN_TX
+#include <linux/if_vlan.h>
+#endif
+
+#include "ixgbe.h"
+
+#include "ixgbe_sriov.h"
+
+int ixgbe_set_vf_multicasts(struct ixgbe_adapter *adapter,
+			    int entries, u16 *hash_list, u32 vf)
+{
+	struct vf_data_storage *vfinfo = &adapter->vfinfo[vf];
+	int i;
+
+	/* only so many hash values supported */
+	entries = min(entries, IXGBE_MAX_VF_MC_ENTRIES);
+
+	/*
+	 * salt away the number of multi cast addresses assigned
+	 * to this VF for later use to restore when the PF multi cast
+	 * list changes
+	 */
+	vfinfo->num_vf_mc_hashes = entries;
+
+	/*
+	 * VFs are limited to using the MTA hash table for their multicast
+	 * addresses
+	 */
+	for (i = 0; i < entries; i++) {
+		vfinfo->vf_mc_hashes[i] = hash_list[i];;
+	}
+
+	/* Flush and reset the mta with the new values */
+	ixgbe_set_rx_mode(adapter->netdev);
+
+	return 0;
+}
+
+void ixgbe_restore_vf_multicasts(struct ixgbe_adapter *adapter)
+{
+	struct ixgbe_hw *hw = &adapter->hw;
+	struct vf_data_storage *vfinfo;
+	int i, j;
+	u32 vector_bit;
+	u32 vector_reg;
+	u32 mta_reg;
+
+	for (i = 0; i < adapter->num_vfs; i++) {
+		vfinfo = &adapter->vfinfo[i];
+		for (j = 0; j < vfinfo->num_vf_mc_hashes; j++) {
+			hw->addr_ctrl.mta_in_use++;
+			vector_reg = (vfinfo->vf_mc_hashes[j] >> 5) & 0x7F;
+			vector_bit = vfinfo->vf_mc_hashes[j] & 0x1F;
+			mta_reg = IXGBE_READ_REG(hw, IXGBE_MTA(vector_reg));
+			mta_reg |= (1 << vector_bit);
+			IXGBE_WRITE_REG(hw, IXGBE_MTA(vector_reg), mta_reg);
+		}
+	}
+}
+
+int ixgbe_set_vf_vlan(struct ixgbe_adapter *adapter, int add, int vid, u32 vf)
+{
+	u32 ctrl;
+
+	/* Check if global VLAN already set, if not set it */
+	ctrl = IXGBE_READ_REG(&adapter->hw, IXGBE_VLNCTRL);
+	if (!(ctrl & IXGBE_VLNCTRL_VFE)) {
+		/* enable VLAN tag insert/strip */
+		ctrl |= IXGBE_VLNCTRL_VFE;
+		ctrl &= ~IXGBE_VLNCTRL_CFIEN;
+		IXGBE_WRITE_REG(&adapter->hw, IXGBE_VLNCTRL, ctrl);
+	}
+
+	return adapter->hw.mac.ops.set_vfta(&adapter->hw, vid, vf, (bool)add);
+}
+
+
+void ixgbe_set_vmolr(struct ixgbe_hw *hw, u32 vf)
+{
+	u32 vmolr = IXGBE_READ_REG(hw, IXGBE_VMOLR(vf));
+	vmolr |= (IXGBE_VMOLR_AUPE |
+		  IXGBE_VMOLR_ROMPE |
+		  IXGBE_VMOLR_ROPE |
+		  IXGBE_VMOLR_BAM);
+	IXGBE_WRITE_REG(hw, IXGBE_VMOLR(vf), vmolr);
+}
+
+inline void ixgbe_vf_reset_event(struct ixgbe_adapter *adapter, u32 vf)
+{
+	struct ixgbe_hw *hw = &adapter->hw;
+
+	/* reset offloads to defaults */
+	ixgbe_set_vmolr(hw, vf);
+
+
+	/* reset multicast table array for vf */
+	adapter->vfinfo[vf].num_vf_mc_hashes = 0;
+
+	/* Flush and reset the mta with the new values */
+	ixgbe_set_rx_mode(adapter->netdev);
+
+	if (adapter->vfinfo[vf].rar > 0) {
+		adapter->hw.mac.ops.clear_rar(&adapter->hw,
+		                              adapter->vfinfo[vf].rar);
+		adapter->vfinfo[vf].rar = -1;
+	}
+}
+
+int ixgbe_set_vf_mac(struct ixgbe_adapter *adapter,
+                          int vf, unsigned char *mac_addr)
+{
+	struct ixgbe_hw *hw = &adapter->hw;
+
+	adapter->vfinfo[vf].rar = hw->mac.ops.set_rar(hw, vf + 1, mac_addr,
+	                                              vf, IXGBE_RAH_AV);
+	if (adapter->vfinfo[vf].rar < 0) {
+		DPRINTK(DRV, ERR, "Could not set MAC Filter for VF %d\n", vf);
+		return -1;
+	}
+
+	memcpy(adapter->vfinfo[vf].vf_mac_addresses, mac_addr, 6);
+
+	return 0;
+}
+
+int ixgbe_vf_configuration(struct pci_dev *pdev, unsigned int event_mask)
+{
+	unsigned char vf_mac_addr[6];
+	struct net_device *netdev = pci_get_drvdata(pdev);
+	struct ixgbe_adapter *adapter = netdev_priv(netdev);
+	unsigned int vfn = (event_mask & 0x3f);
+
+	bool enable = ((event_mask & 0x10000000U) != 0);
+
+	if (enable) {
+		random_ether_addr(vf_mac_addr);
+		DPRINTK(PROBE, INFO, "IOV: VF %d is enabled "
+		       "mac %02X:%02X:%02X:%02X:%02X:%02X\n",
+		       vfn,
+		       vf_mac_addr[0], vf_mac_addr[1], vf_mac_addr[2],
+		       vf_mac_addr[3], vf_mac_addr[4], vf_mac_addr[5]);
+		/*
+		 * Store away the VF "permananet" MAC address, it will ask
+		 * for it later.
+		 */
+		memcpy(adapter->vfinfo[vfn].vf_mac_addresses, vf_mac_addr, 6);
+	}
+
+	return 0;
+}
+
+inline void ixgbe_vf_reset_msg(struct ixgbe_adapter *adapter, u32 vf)
+{
+	struct ixgbe_hw *hw = &adapter->hw;
+	u32 reg;
+	u32 reg_offset, vf_shift;
+
+	vf_shift = vf % 32;
+	reg_offset = vf / 32;
+
+	/* enable transmit and receive for vf */
+	reg = IXGBE_READ_REG(hw, IXGBE_VFTE(reg_offset));
+	reg |= (reg | (1 << vf_shift));
+	IXGBE_WRITE_REG(hw, IXGBE_VFTE(reg_offset), reg);
+
+	reg = IXGBE_READ_REG(hw, IXGBE_VFRE(reg_offset));
+	reg |= (reg | (1 << vf_shift));
+	IXGBE_WRITE_REG(hw, IXGBE_VFRE(reg_offset), reg);
+
+	ixgbe_vf_reset_event(adapter, vf);
+}
+
+static int ixgbe_rcv_msg_from_vf(struct ixgbe_adapter *adapter, u32 vf)
+{
+	u32 mbx_size = IXGBE_VFMAILBOX_SIZE;
+	u32 msgbuf[mbx_size];
+	struct ixgbe_hw *hw = &adapter->hw;
+	s32 retval;
+	int entries;
+	u16 *hash_list;
+	int add, vid;
+
+	retval = ixgbe_read_mbx(hw, msgbuf, mbx_size, vf);
+
+	if (retval)
+		printk(KERN_ERR "Error receiving message from VF\n");
+
+	/* this is a message we already processed, do nothing */
+	if (msgbuf[0] & (IXGBE_VT_MSGTYPE_ACK | IXGBE_VT_MSGTYPE_NACK))
+		return retval;
+
+	/*
+	 * until the vf completes a virtual function reset it should not be
+	 * allowed to start any configuration.
+	 */
+
+	if (msgbuf[0] == IXGBE_VF_RESET) {
+		unsigned char *vf_mac = adapter->vfinfo[vf].vf_mac_addresses;
+		u8 *addr = (u8 *)(&msgbuf[1]);
+		DPRINTK(PROBE, INFO, "VF Reset msg received from vf %d\n", vf);
+		adapter->vfinfo[vf].clear_to_send = false;
+		ixgbe_vf_reset_msg(adapter, vf);
+		adapter->vfinfo[vf].clear_to_send = true;
+
+		/* reply to reset with ack and vf mac address */
+		msgbuf[0] = IXGBE_VF_RESET | IXGBE_VT_MSGTYPE_ACK;
+		memcpy(addr, vf_mac, IXGBE_ETH_LENGTH_OF_ADDRESS);
+		/*
+		 * Piggyback the multicast filter type so VF can compute the
+		 * correct vectors
+		 */
+		msgbuf[3] = hw->mac.mc_filter_type;
+		ixgbe_write_mbx(hw, msgbuf, IXGBE_VF_PERMADDR_MSG_LEN, vf);
+
+		return retval;
+	}
+
+	if (!adapter->vfinfo[vf].clear_to_send) {
+		msgbuf[0] |= IXGBE_VT_MSGTYPE_NACK;
+		ixgbe_write_mbx(hw, msgbuf, 1, vf);
+		return retval;
+	}
+
+	switch ((msgbuf[0] & 0xFFFF)) {
+	case IXGBE_VF_SET_MAC_ADDR:
+		{
+			u8 *new_mac = ((u8 *)(&msgbuf[1]));
+			if (is_valid_ether_addr(new_mac))
+				ixgbe_set_vf_mac(adapter, vf, new_mac);
+			else
+				retval = -1;
+		}
+		break;
+	case IXGBE_VF_SET_MULTICAST:
+		entries = (msgbuf[0] & IXGBE_VT_MSGINFO_MASK)
+		          >> IXGBE_VT_MSGINFO_SHIFT;
+		hash_list = (u16 *)&msgbuf[1];
+		retval = ixgbe_set_vf_multicasts(adapter, entries,
+		                                 hash_list, vf);
+		break;
+	case IXGBE_VF_SET_LPE:
+		WARN_ON((msgbuf[0] & 0xFFFF) == IXGBE_VF_SET_LPE);
+		break;
+	case IXGBE_VF_SET_VLAN:
+		add = (msgbuf[0] & IXGBE_VT_MSGINFO_MASK)
+		      >> IXGBE_VT_MSGINFO_SHIFT;
+		vid = (msgbuf[1] & IXGBE_VLVF_VLANID_MASK);
+		retval = ixgbe_set_vf_vlan(adapter, add, vid, vf);
+		break;
+	default:
+		DPRINTK(DRV, ERR, "Unhandled Msg %8.8x\n", msgbuf[0]);
+		retval = IXGBE_ERR_MBX;
+		break;
+	}
+
+	/* notify the VF of the results of what it sent us */
+	if (retval)
+		msgbuf[0] |= IXGBE_VT_MSGTYPE_NACK;
+	else
+		msgbuf[0] |= IXGBE_VT_MSGTYPE_ACK;
+
+	msgbuf[0] |= IXGBE_VT_MSGTYPE_CTS;
+
+	ixgbe_write_mbx(hw, msgbuf, 1, vf);
+
+	return retval;
+}
+
+static void ixgbe_rcv_ack_from_vf(struct ixgbe_adapter *adapter, u32 vf)
+{
+	struct ixgbe_hw *hw = &adapter->hw;
+	u32 msg = IXGBE_VT_MSGTYPE_NACK;
+
+	/* if device isn't clear to send it shouldn't be reading either */
+	if (!adapter->vfinfo[vf].clear_to_send)
+		ixgbe_write_mbx(hw, &msg, 1, vf);
+}
+
+void ixgbe_msg_task(struct ixgbe_adapter *adapter)
+{
+	struct ixgbe_hw *hw = &adapter->hw;
+	u32 vf;
+
+	for (vf = 0; vf < adapter->num_vfs; vf++) {
+		/* process any reset requests */
+		if (!ixgbe_check_for_rst(hw, vf))
+			ixgbe_vf_reset_event(adapter, vf);
+
+		/* process any messages pending */
+		if (!ixgbe_check_for_msg(hw, vf))
+			ixgbe_rcv_msg_from_vf(adapter, vf);
+
+		/* process any acks */
+		if (!ixgbe_check_for_ack(hw, vf))
+			ixgbe_rcv_ack_from_vf(adapter, vf);
+	}
+}
+