Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2399 insertions, 0 deletions

diff --git a/drivers/infiniband/hw/mlx4/mad.c b/drivers/infiniband/hw/mlx4/mad.c
new file mode 100644
index 000000000..418b9312f
--- /dev/null
+++ b/drivers/infiniband/hw/mlx4/mad.c
@@ -0,0 +1,2399 @@
+/*
+ * Copyright (c) 2007 Cisco Systems, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ *     Redistribution and use in source and binary forms, with or
+ *     without modification, are permitted provided that the following
+ *     conditions are met:
+ *
+ *      - Redistributions of source code must retain the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer.
+ *
+ *      - Redistributions in binary form must reproduce the above
+ *        copyright notice, this list of conditions and the following
+ *        disclaimer in the documentation and/or other materials
+ *        provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include <rdma/ib_mad.h>
+#include <rdma/ib_smi.h>
+#include <rdma/ib_sa.h>
+#include <rdma/ib_cache.h>
+
+#include <linux/random.h>
+#include <linux/mlx4/cmd.h>
+#include <linux/gfp.h>
+#include <rdma/ib_pma.h>
+#include <linux/ip.h>
+#include <net/ipv6.h>
+
+#include <linux/mlx4/driver.h>
+#include "mlx4_ib.h"
+
+enum {
+	MLX4_IB_VENDOR_CLASS1 = 0x9,
+	MLX4_IB_VENDOR_CLASS2 = 0xa
+};
+
+#define MLX4_TUN_SEND_WRID_SHIFT 34
+#define MLX4_TUN_QPN_SHIFT 32
+#define MLX4_TUN_WRID_RECV (((u64) 1) << MLX4_TUN_SEND_WRID_SHIFT)
+#define MLX4_TUN_SET_WRID_QPN(a) (((u64) ((a) & 0x3)) << MLX4_TUN_QPN_SHIFT)
+
+#define MLX4_TUN_IS_RECV(a)  (((a) >>  MLX4_TUN_SEND_WRID_SHIFT) & 0x1)
+#define MLX4_TUN_WRID_QPN(a) (((a) >> MLX4_TUN_QPN_SHIFT) & 0x3)
+
+ /* Port mgmt change event handling */
+
+#define GET_BLK_PTR_FROM_EQE(eqe) be32_to_cpu(eqe->event.port_mgmt_change.params.tbl_change_info.block_ptr)
+#define GET_MASK_FROM_EQE(eqe) be32_to_cpu(eqe->event.port_mgmt_change.params.tbl_change_info.tbl_entries_mask)
+#define NUM_IDX_IN_PKEY_TBL_BLK 32
+#define GUID_TBL_ENTRY_SIZE 8	   /* size in bytes */
+#define GUID_TBL_BLK_NUM_ENTRIES 8
+#define GUID_TBL_BLK_SIZE (GUID_TBL_ENTRY_SIZE * GUID_TBL_BLK_NUM_ENTRIES)
+
+struct mlx4_mad_rcv_buf {
+	struct ib_grh grh;
+	u8 payload[256];
+} __packed;
+
+struct mlx4_mad_snd_buf {
+	u8 payload[256];
+} __packed;
+
+struct mlx4_tunnel_mad {
+	struct ib_grh grh;
+	struct mlx4_ib_tunnel_header hdr;
+	struct ib_mad mad;
+} __packed;
+
+struct mlx4_rcv_tunnel_mad {
+	struct mlx4_rcv_tunnel_hdr hdr;
+	struct ib_grh grh;
+	struct ib_mad mad;
+} __packed;
+
+static void handle_client_rereg_event(struct mlx4_ib_dev *dev, u8 port_num);
+static void handle_lid_change_event(struct mlx4_ib_dev *dev, u8 port_num);
+static void __propagate_pkey_ev(struct mlx4_ib_dev *dev, int port_num,
+				int block, u32 change_bitmap);
+
+__be64 mlx4_ib_gen_node_guid(void)
+{
+#define NODE_GUID_HI	((u64) (((u64)IB_OPENIB_OUI) << 40))
+	return cpu_to_be64(NODE_GUID_HI | prandom_u32());
+}
+
+__be64 mlx4_ib_get_new_demux_tid(struct mlx4_ib_demux_ctx *ctx)
+{
+	return cpu_to_be64(atomic_inc_return(&ctx->tid)) |
+		cpu_to_be64(0xff00000000000000LL);
+}
+
+int mlx4_MAD_IFC(struct mlx4_ib_dev *dev, int mad_ifc_flags,
+		 int port, const struct ib_wc *in_wc,
+		 const struct ib_grh *in_grh,
+		 const void *in_mad, void *response_mad)
+{
+	struct mlx4_cmd_mailbox *inmailbox, *outmailbox;
+	void *inbox;
+	int err;
+	u32 in_modifier = port;
+	u8 op_modifier = 0;
+
+	inmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
+	if (IS_ERR(inmailbox))
+		return PTR_ERR(inmailbox);
+	inbox = inmailbox->buf;
+
+	outmailbox = mlx4_alloc_cmd_mailbox(dev->dev);
+	if (IS_ERR(outmailbox)) {
+		mlx4_free_cmd_mailbox(dev->dev, inmailbox);
+		return PTR_ERR(outmailbox);
+	}
+
+	memcpy(inbox, in_mad, 256);
+
+	/*
+	 * Key check traps can't be generated unless we have in_wc to
+	 * tell us where to send the trap.
+	 */
+	if ((mad_ifc_flags & MLX4_MAD_IFC_IGNORE_MKEY) || !in_wc)
+		op_modifier |= 0x1;
+	if ((mad_ifc_flags & MLX4_MAD_IFC_IGNORE_BKEY) || !in_wc)
+		op_modifier |= 0x2;
+	if (mlx4_is_mfunc(dev->dev) &&
+	    (mad_ifc_flags & MLX4_MAD_IFC_NET_VIEW || in_wc))
+		op_modifier |= 0x8;
+
+	if (in_wc) {
+		struct {
+			__be32		my_qpn;
+			u32		reserved1;
+			__be32		rqpn;
+			u8		sl;
+			u8		g_path;
+			u16		reserved2[2];
+			__be16		pkey;
+			u32		reserved3[11];
+			u8		grh[40];
+		} *ext_info;
+
+		memset(inbox + 256, 0, 256);
+		ext_info = inbox + 256;
+
+		ext_info->my_qpn = cpu_to_be32(in_wc->qp->qp_num);
+		ext_info->rqpn   = cpu_to_be32(in_wc->src_qp);
+		ext_info->sl     = in_wc->sl << 4;
+		ext_info->g_path = in_wc->dlid_path_bits |
+			(in_wc->wc_flags & IB_WC_GRH ? 0x80 : 0);
+		ext_info->pkey   = cpu_to_be16(in_wc->pkey_index);
+
+		if (in_grh)
+			memcpy(ext_info->grh, in_grh, 40);
+
+		op_modifier |= 0x4;
+
+		in_modifier |= ib_lid_cpu16(in_wc->slid) << 16;
+	}
+
+	err = mlx4_cmd_box(dev->dev, inmailbox->dma, outmailbox->dma, in_modifier,
+			   mlx4_is_master(dev->dev) ? (op_modifier & ~0x8) : op_modifier,
+			   MLX4_CMD_MAD_IFC, MLX4_CMD_TIME_CLASS_C,
+			   (op_modifier & 0x8) ? MLX4_CMD_NATIVE : MLX4_CMD_WRAPPED);
+
+	if (!err)
+		memcpy(response_mad, outmailbox->buf, 256);
+
+	mlx4_free_cmd_mailbox(dev->dev, inmailbox);
+	mlx4_free_cmd_mailbox(dev->dev, outmailbox);
+
+	return err;
+}
+
+static void update_sm_ah(struct mlx4_ib_dev *dev, u8 port_num, u16 lid, u8 sl)
+{
+	struct ib_ah *new_ah;
+	struct rdma_ah_attr ah_attr;
+	unsigned long flags;
+
+	if (!dev->send_agent[port_num - 1][0])
+		return;
+
+	memset(&ah_attr, 0, sizeof ah_attr);
+	ah_attr.type = rdma_ah_find_type(&dev->ib_dev, port_num);
+	rdma_ah_set_dlid(&ah_attr, lid);
+	rdma_ah_set_sl(&ah_attr, sl);
+	rdma_ah_set_port_num(&ah_attr, port_num);
+
+	new_ah = rdma_create_ah(dev->send_agent[port_num - 1][0]->qp->pd,
+				&ah_attr);
+	if (IS_ERR(new_ah))
+		return;
+
+	spin_lock_irqsave(&dev->sm_lock, flags);
+	if (dev->sm_ah[port_num - 1])
+		rdma_destroy_ah(dev->sm_ah[port_num - 1]);
+	dev->sm_ah[port_num - 1] = new_ah;
+	spin_unlock_irqrestore(&dev->sm_lock, flags);
+}
+
+/*
+ * Snoop SM MADs for port info, GUID info, and  P_Key table sets, so we can
+ * synthesize LID change, Client-Rereg, GID change, and P_Key change events.
+ */
+static void smp_snoop(struct ib_device *ibdev, u8 port_num, const struct ib_mad *mad,
+		      u16 prev_lid)
+{
+	struct ib_port_info *pinfo;
+	u16 lid;
+	__be16 *base;
+	u32 bn, pkey_change_bitmap;
+	int i;
+
+
+	struct mlx4_ib_dev *dev = to_mdev(ibdev);
+	if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
+	     mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
+	    mad->mad_hdr.method == IB_MGMT_METHOD_SET)
+		switch (mad->mad_hdr.attr_id) {
+		case IB_SMP_ATTR_PORT_INFO:
+			if (dev->dev->caps.flags & MLX4_DEV_CAP_FLAG_PORT_MNG_CHG_EV)
+				return;
+			pinfo = (struct ib_port_info *) ((struct ib_smp *) mad)->data;
+			lid = be16_to_cpu(pinfo->lid);
+
+			update_sm_ah(dev, port_num,
+				     be16_to_cpu(pinfo->sm_lid),
+				     pinfo->neighbormtu_mastersmsl & 0xf);
+
+			if (pinfo->clientrereg_resv_subnetto & 0x80)
+				handle_client_rereg_event(dev, port_num);
+
+			if (prev_lid != lid)
+				handle_lid_change_event(dev, port_num);
+			break;
+
+		case IB_SMP_ATTR_PKEY_TABLE:
+			if (dev->dev->caps.flags & MLX4_DEV_CAP_FLAG_PORT_MNG_CHG_EV)
+				return;
+			if (!mlx4_is_mfunc(dev->dev)) {
+				mlx4_ib_dispatch_event(dev, port_num,
+						       IB_EVENT_PKEY_CHANGE);
+				break;
+			}
+
+			/* at this point, we are running in the master.
+			 * Slaves do not receive SMPs.
+			 */
+			bn  = be32_to_cpu(((struct ib_smp *)mad)->attr_mod) & 0xFFFF;
+			base = (__be16 *) &(((struct ib_smp *)mad)->data[0]);
+			pkey_change_bitmap = 0;
+			for (i = 0; i < 32; i++) {
+				pr_debug("PKEY[%d] = x%x\n",
+					 i + bn*32, be16_to_cpu(base[i]));
+				if (be16_to_cpu(base[i]) !=
+				    dev->pkeys.phys_pkey_cache[port_num - 1][i + bn*32]) {
+					pkey_change_bitmap |= (1 << i);
+					dev->pkeys.phys_pkey_cache[port_num - 1][i + bn*32] =
+						be16_to_cpu(base[i]);
+				}
+			}
+			pr_debug("PKEY Change event: port=%d, "
+				 "block=0x%x, change_bitmap=0x%x\n",
+				 port_num, bn, pkey_change_bitmap);
+
+			if (pkey_change_bitmap) {
+				mlx4_ib_dispatch_event(dev, port_num,
+						       IB_EVENT_PKEY_CHANGE);
+				if (!dev->sriov.is_going_down)
+					__propagate_pkey_ev(dev, port_num, bn,
+							    pkey_change_bitmap);
+			}
+			break;
+
+		case IB_SMP_ATTR_GUID_INFO:
+			if (dev->dev->caps.flags & MLX4_DEV_CAP_FLAG_PORT_MNG_CHG_EV)
+				return;
+			/* paravirtualized master's guid is guid 0 -- does not change */
+			if (!mlx4_is_master(dev->dev))
+				mlx4_ib_dispatch_event(dev, port_num,
+						       IB_EVENT_GID_CHANGE);
+			/*if master, notify relevant slaves*/
+			if (mlx4_is_master(dev->dev) &&
+			    !dev->sriov.is_going_down) {
+				bn = be32_to_cpu(((struct ib_smp *)mad)->attr_mod);
+				mlx4_ib_update_cache_on_guid_change(dev, bn, port_num,
+								    (u8 *)(&((struct ib_smp *)mad)->data));
+				mlx4_ib_notify_slaves_on_guid_change(dev, bn, port_num,
+								     (u8 *)(&((struct ib_smp *)mad)->data));
+			}
+			break;
+
+		case IB_SMP_ATTR_SL_TO_VL_TABLE:
+			/* cache sl to vl mapping changes for use in
+			 * filling QP1 LRH VL field when sending packets
+			 */
+			if (dev->dev->caps.flags & MLX4_DEV_CAP_FLAG_PORT_MNG_CHG_EV &&
+			    dev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_SL_TO_VL_CHANGE_EVENT)
+				return;
+			if (!mlx4_is_slave(dev->dev)) {
+				union sl2vl_tbl_to_u64 sl2vl64;
+				int jj;
+
+				for (jj = 0; jj < 8; jj++) {
+					sl2vl64.sl8[jj] = ((struct ib_smp *)mad)->data[jj];
+					pr_debug("port %u, sl2vl[%d] = %02x\n",
+						 port_num, jj, sl2vl64.sl8[jj]);
+				}
+				atomic64_set(&dev->sl2vl[port_num - 1], sl2vl64.sl64);
+			}
+			break;
+
+		default:
+			break;
+		}
+}
+
+static void __propagate_pkey_ev(struct mlx4_ib_dev *dev, int port_num,
+				int block, u32 change_bitmap)
+{
+	int i, ix, slave, err;
+	int have_event = 0;
+
+	for (slave = 0; slave < dev->dev->caps.sqp_demux; slave++) {
+		if (slave == mlx4_master_func_num(dev->dev))
+			continue;
+		if (!mlx4_is_slave_active(dev->dev, slave))
+			continue;
+
+		have_event = 0;
+		for (i = 0; i < 32; i++) {
+			if (!(change_bitmap & (1 << i)))
+				continue;
+			for (ix = 0;
+			     ix < dev->dev->caps.pkey_table_len[port_num]; ix++) {
+				if (dev->pkeys.virt2phys_pkey[slave][port_num - 1]
+				    [ix] == i + 32 * block) {
+					err = mlx4_gen_pkey_eqe(dev->dev, slave, port_num);
+					pr_debug("propagate_pkey_ev: slave %d,"
+						 " port %d, ix %d (%d)\n",
+						 slave, port_num, ix, err);
+					have_event = 1;
+					break;
+				}
+			}
+			if (have_event)
+				break;
+		}
+	}
+}
+
+static void node_desc_override(struct ib_device *dev,
+			       struct ib_mad *mad)
+{
+	unsigned long flags;
+
+	if ((mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
+	     mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
+	    mad->mad_hdr.method == IB_MGMT_METHOD_GET_RESP &&
+	    mad->mad_hdr.attr_id == IB_SMP_ATTR_NODE_DESC) {
+		spin_lock_irqsave(&to_mdev(dev)->sm_lock, flags);
+		memcpy(((struct ib_smp *) mad)->data, dev->node_desc,
+		       IB_DEVICE_NODE_DESC_MAX);
+		spin_unlock_irqrestore(&to_mdev(dev)->sm_lock, flags);
+	}
+}
+
+static void forward_trap(struct mlx4_ib_dev *dev, u8 port_num, const struct ib_mad *mad)
+{
+	int qpn = mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_SUBN_LID_ROUTED;
+	struct ib_mad_send_buf *send_buf;
+	struct ib_mad_agent *agent = dev->send_agent[port_num - 1][qpn];
+	int ret;
+	unsigned long flags;
+
+	if (agent) {
+		send_buf = ib_create_send_mad(agent, qpn, 0, 0, IB_MGMT_MAD_HDR,
+					      IB_MGMT_MAD_DATA, GFP_ATOMIC,
+					      IB_MGMT_BASE_VERSION);
+		if (IS_ERR(send_buf))
+			return;
+		/*
+		 * We rely here on the fact that MLX QPs don't use the
+		 * address handle after the send is posted (this is
+		 * wrong following the IB spec strictly, but we know
+		 * it's OK for our devices).
+		 */
+		spin_lock_irqsave(&dev->sm_lock, flags);
+		memcpy(send_buf->mad, mad, sizeof *mad);
+		if ((send_buf->ah = dev->sm_ah[port_num - 1]))
+			ret = ib_post_send_mad(send_buf, NULL);
+		else
+			ret = -EINVAL;
+		spin_unlock_irqrestore(&dev->sm_lock, flags);
+
+		if (ret)
+			ib_free_send_mad(send_buf);
+	}
+}
+
+static int mlx4_ib_demux_sa_handler(struct ib_device *ibdev, int port, int slave,
+							     struct ib_sa_mad *sa_mad)
+{
+	int ret = 0;
+
+	/* dispatch to different sa handlers */
+	switch (be16_to_cpu(sa_mad->mad_hdr.attr_id)) {
+	case IB_SA_ATTR_MC_MEMBER_REC:
+		ret = mlx4_ib_mcg_demux_handler(ibdev, port, slave, sa_mad);
+		break;
+	default:
+		break;
+	}
+	return ret;
+}
+
+int mlx4_ib_find_real_gid(struct ib_device *ibdev, u8 port, __be64 guid)
+{
+	struct mlx4_ib_dev *dev = to_mdev(ibdev);
+	int i;
+
+	for (i = 0; i < dev->dev->caps.sqp_demux; i++) {
+		if (dev->sriov.demux[port - 1].guid_cache[i] == guid)
+			return i;
+	}
+	return -1;
+}
+
+
+static int find_slave_port_pkey_ix(struct mlx4_ib_dev *dev, int slave,
+				   u8 port, u16 pkey, u16 *ix)
+{
+	int i, ret;
+	u8 unassigned_pkey_ix, pkey_ix, partial_ix = 0xFF;
+	u16 slot_pkey;
+
+	if (slave == mlx4_master_func_num(dev->dev))
+		return ib_find_cached_pkey(&dev->ib_dev, port, pkey, ix);
+
+	unassigned_pkey_ix = dev->dev->phys_caps.pkey_phys_table_len[port] - 1;
+
+	for (i = 0; i < dev->dev->caps.pkey_table_len[port]; i++) {
+		if (dev->pkeys.virt2phys_pkey[slave][port - 1][i] == unassigned_pkey_ix)
+			continue;
+
+		pkey_ix = dev->pkeys.virt2phys_pkey[slave][port - 1][i];
+
+		ret = ib_get_cached_pkey(&dev->ib_dev, port, pkey_ix, &slot_pkey);
+		if (ret)
+			continue;
+		if ((slot_pkey & 0x7FFF) == (pkey & 0x7FFF)) {
+			if (slot_pkey & 0x8000) {
+				*ix = (u16) pkey_ix;
+				return 0;
+			} else {
+				/* take first partial pkey index found */
+				if (partial_ix == 0xFF)
+					partial_ix = pkey_ix;
+			}
+		}
+	}
+
+	if (partial_ix < 0xFF) {
+		*ix = (u16) partial_ix;
+		return 0;
+	}
+
+	return -EINVAL;
+}
+
+static int get_gids_from_l3_hdr(struct ib_grh *grh, union ib_gid *sgid,
+				union ib_gid *dgid)
+{
+	int version = ib_get_rdma_header_version((const union rdma_network_hdr *)grh);
+	enum rdma_network_type net_type;
+
+	if (version == 4)
+		net_type = RDMA_NETWORK_IPV4;
+	else if (version == 6)
+		net_type = RDMA_NETWORK_IPV6;
+	else
+		return -EINVAL;
+
+	return ib_get_gids_from_rdma_hdr((union rdma_network_hdr *)grh, net_type,
+					 sgid, dgid);
+}
+
+int mlx4_ib_send_to_slave(struct mlx4_ib_dev *dev, int slave, u8 port,
+			  enum ib_qp_type dest_qpt, struct ib_wc *wc,
+			  struct ib_grh *grh, struct ib_mad *mad)
+{
+	struct ib_sge list;
+	struct ib_ud_wr wr;
+	const struct ib_send_wr *bad_wr;
+	struct mlx4_ib_demux_pv_ctx *tun_ctx;
+	struct mlx4_ib_demux_pv_qp *tun_qp;
+	struct mlx4_rcv_tunnel_mad *tun_mad;
+	struct rdma_ah_attr attr;
+	struct ib_ah *ah;
+	struct ib_qp *src_qp = NULL;
+	unsigned tun_tx_ix = 0;
+	int dqpn;
+	int ret = 0;
+	u16 tun_pkey_ix;
+	u16 cached_pkey;
+	u8 is_eth = dev->dev->caps.port_type[port] == MLX4_PORT_TYPE_ETH;
+
+	if (dest_qpt > IB_QPT_GSI)
+		return -EINVAL;
+
+	tun_ctx = dev->sriov.demux[port-1].tun[slave];
+
+	/* check if proxy qp created */
+	if (!tun_ctx || tun_ctx->state != DEMUX_PV_STATE_ACTIVE)
+		return -EAGAIN;
+
+	if (!dest_qpt)
+		tun_qp = &tun_ctx->qp[0];
+	else
+		tun_qp = &tun_ctx->qp[1];
+
+	/* compute P_Key index to put in tunnel header for slave */
+	if (dest_qpt) {
+		u16 pkey_ix;
+		ret = ib_get_cached_pkey(&dev->ib_dev, port, wc->pkey_index, &cached_pkey);
+		if (ret)
+			return -EINVAL;
+
+		ret = find_slave_port_pkey_ix(dev, slave, port, cached_pkey, &pkey_ix);
+		if (ret)
+			return -EINVAL;
+		tun_pkey_ix = pkey_ix;
+	} else
+		tun_pkey_ix = dev->pkeys.virt2phys_pkey[slave][port - 1][0];
+
+	dqpn = dev->dev->phys_caps.base_proxy_sqpn + 8 * slave + port + (dest_qpt * 2) - 1;
+
+	/* get tunnel tx data buf for slave */
+	src_qp = tun_qp->qp;
+
+	/* create ah. Just need an empty one with the port num for the post send.
+	 * The driver will set the force loopback bit in post_send */
+	memset(&attr, 0, sizeof attr);
+	attr.type = rdma_ah_find_type(&dev->ib_dev, port);
+
+	rdma_ah_set_port_num(&attr, port);
+	if (is_eth) {
+		union ib_gid sgid;
+		union ib_gid dgid;
+
+		if (get_gids_from_l3_hdr(grh, &sgid, &dgid))
+			return -EINVAL;
+		rdma_ah_set_grh(&attr, &dgid, 0, 0, 0, 0);
+	}
+	ah = rdma_create_ah(tun_ctx->pd, &attr);
+	if (IS_ERR(ah))
+		return -ENOMEM;
+
+	/* allocate tunnel tx buf after pass failure returns */
+	spin_lock(&tun_qp->tx_lock);
+	if (tun_qp->tx_ix_head - tun_qp->tx_ix_tail >=
+	    (MLX4_NUM_TUNNEL_BUFS - 1))
+		ret = -EAGAIN;
+	else
+		tun_tx_ix = (++tun_qp->tx_ix_head) & (MLX4_NUM_TUNNEL_BUFS - 1);
+	spin_unlock(&tun_qp->tx_lock);
+	if (ret)
+		goto end;
+
+	tun_mad = (struct mlx4_rcv_tunnel_mad *) (tun_qp->tx_ring[tun_tx_ix].buf.addr);
+	if (tun_qp->tx_ring[tun_tx_ix].ah)
+		rdma_destroy_ah(tun_qp->tx_ring[tun_tx_ix].ah);
+	tun_qp->tx_ring[tun_tx_ix].ah = ah;
+	ib_dma_sync_single_for_cpu(&dev->ib_dev,
+				   tun_qp->tx_ring[tun_tx_ix].buf.map,
+				   sizeof (struct mlx4_rcv_tunnel_mad),
+				   DMA_TO_DEVICE);
+
+	/* copy over to tunnel buffer */
+	if (grh)
+		memcpy(&tun_mad->grh, grh, sizeof *grh);
+	memcpy(&tun_mad->mad, mad, sizeof *mad);
+
+	/* adjust tunnel data */
+	tun_mad->hdr.pkey_index = cpu_to_be16(tun_pkey_ix);
+	tun_mad->hdr.flags_src_qp = cpu_to_be32(wc->src_qp & 0xFFFFFF);
+	tun_mad->hdr.g_ml_path = (grh && (wc->wc_flags & IB_WC_GRH)) ? 0x80 : 0;
+
+	if (is_eth) {
+		u16 vlan = 0;
+		if (mlx4_get_slave_default_vlan(dev->dev, port, slave, &vlan,
+						NULL)) {
+			/* VST mode */
+			if (vlan != wc->vlan_id)
+				/* Packet vlan is not the VST-assigned vlan.
+				 * Drop the packet.
+				 */
+				goto out;
+			 else
+				/* Remove the vlan tag before forwarding
+				 * the packet to the VF.
+				 */
+				vlan = 0xffff;
+		} else {
+			vlan = wc->vlan_id;
+		}
+
+		tun_mad->hdr.sl_vid = cpu_to_be16(vlan);
+		memcpy((char *)&tun_mad->hdr.mac_31_0, &(wc->smac[0]), 4);
+		memcpy((char *)&tun_mad->hdr.slid_mac_47_32, &(wc->smac[4]), 2);
+	} else {
+		tun_mad->hdr.sl_vid = cpu_to_be16(((u16)(wc->sl)) << 12);
+		tun_mad->hdr.slid_mac_47_32 = ib_lid_be16(wc->slid);
+	}
+
+	ib_dma_sync_single_for_device(&dev->ib_dev,
+				      tun_qp->tx_ring[tun_tx_ix].buf.map,
+				      sizeof (struct mlx4_rcv_tunnel_mad),
+				      DMA_TO_DEVICE);
+
+	list.addr = tun_qp->tx_ring[tun_tx_ix].buf.map;
+	list.length = sizeof (struct mlx4_rcv_tunnel_mad);
+	list.lkey = tun_ctx->pd->local_dma_lkey;
+
+	wr.ah = ah;
+	wr.port_num = port;
+	wr.remote_qkey = IB_QP_SET_QKEY;
+	wr.remote_qpn = dqpn;
+	wr.wr.next = NULL;
+	wr.wr.wr_id = ((u64) tun_tx_ix) | MLX4_TUN_SET_WRID_QPN(dest_qpt);
+	wr.wr.sg_list = &list;
+	wr.wr.num_sge = 1;
+	wr.wr.opcode = IB_WR_SEND;
+	wr.wr.send_flags = IB_SEND_SIGNALED;
+
+	ret = ib_post_send(src_qp, &wr.wr, &bad_wr);
+	if (!ret)
+		return 0;
+ out:
+	spin_lock(&tun_qp->tx_lock);
+	tun_qp->tx_ix_tail++;
+	spin_unlock(&tun_qp->tx_lock);
+	tun_qp->tx_ring[tun_tx_ix].ah = NULL;
+end:
+	rdma_destroy_ah(ah);
+	return ret;
+}
+
+static int mlx4_ib_demux_mad(struct ib_device *ibdev, u8 port,
+			struct ib_wc *wc, struct ib_grh *grh,
+			struct ib_mad *mad)
+{
+	struct mlx4_ib_dev *dev = to_mdev(ibdev);
+	int err, other_port;
+	int slave = -1;
+	u8 *slave_id;
+	int is_eth = 0;
+
+	if (rdma_port_get_link_layer(ibdev, port) == IB_LINK_LAYER_INFINIBAND)
+		is_eth = 0;
+	else
+		is_eth = 1;
+
+	if (is_eth) {
+		union ib_gid dgid;
+		union ib_gid sgid;
+
+		if (get_gids_from_l3_hdr(grh, &sgid, &dgid))
+			return -EINVAL;
+		if (!(wc->wc_flags & IB_WC_GRH)) {
+			mlx4_ib_warn(ibdev, "RoCE grh not present.\n");
+			return -EINVAL;
+		}
+		if (mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_CM) {
+			mlx4_ib_warn(ibdev, "RoCE mgmt class is not CM\n");
+			return -EINVAL;
+		}
+		err = mlx4_get_slave_from_roce_gid(dev->dev, port, dgid.raw, &slave);
+		if (err && mlx4_is_mf_bonded(dev->dev)) {
+			other_port = (port == 1) ? 2 : 1;
+			err = mlx4_get_slave_from_roce_gid(dev->dev, other_port, dgid.raw, &slave);
+			if (!err) {
+				port = other_port;
+				pr_debug("resolved slave %d from gid %pI6 wire port %d other %d\n",
+					 slave, grh->dgid.raw, port, other_port);
+			}
+		}
+		if (err) {
+			mlx4_ib_warn(ibdev, "failed matching grh\n");
+			return -ENOENT;
+		}
+		if (slave >= dev->dev->caps.sqp_demux) {
+			mlx4_ib_warn(ibdev, "slave id: %d is bigger than allowed:%d\n",
+				     slave, dev->dev->caps.sqp_demux);
+			return -ENOENT;
+		}
+
+		if (mlx4_ib_demux_cm_handler(ibdev, port, NULL, mad))
+			return 0;
+
+		err = mlx4_ib_send_to_slave(dev, slave, port, wc->qp->qp_type, wc, grh, mad);
+		if (err)
+			pr_debug("failed sending to slave %d via tunnel qp (%d)\n",
+				 slave, err);
+		return 0;
+	}
+
+	/* Initially assume that this mad is for us */
+	slave = mlx4_master_func_num(dev->dev);
+
+	/* See if the slave id is encoded in a response mad */
+	if (mad->mad_hdr.method & 0x80) {
+		slave_id = (u8 *) &mad->mad_hdr.tid;
+		slave = *slave_id;
+		if (slave != 255) /*255 indicates the dom0*/
+			*slave_id = 0; /* remap tid */
+	}
+
+	/* If a grh is present, we demux according to it */
+	if (wc->wc_flags & IB_WC_GRH) {
+		if (grh->dgid.global.interface_id ==
+			cpu_to_be64(IB_SA_WELL_KNOWN_GUID) &&
+		    grh->dgid.global.subnet_prefix == cpu_to_be64(
+			atomic64_read(&dev->sriov.demux[port - 1].subnet_prefix))) {
+			slave = 0;
+		} else {
+			slave = mlx4_ib_find_real_gid(ibdev, port,
+						      grh->dgid.global.interface_id);
+			if (slave < 0) {
+				mlx4_ib_warn(ibdev, "failed matching grh\n");
+				return -ENOENT;
+			}
+		}
+	}
+	/* Class-specific handling */
+	switch (mad->mad_hdr.mgmt_class) {
+	case IB_MGMT_CLASS_SUBN_LID_ROUTED:
+	case IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE:
+		/* 255 indicates the dom0 */
+		if (slave != 255 && slave != mlx4_master_func_num(dev->dev)) {
+			if (!mlx4_vf_smi_enabled(dev->dev, slave, port))
+				return -EPERM;
+			/* for a VF. drop unsolicited MADs */
+			if (!(mad->mad_hdr.method & IB_MGMT_METHOD_RESP)) {
+				mlx4_ib_warn(ibdev, "demux QP0. rejecting unsolicited mad for slave %d class 0x%x, method 0x%x\n",
+					     slave, mad->mad_hdr.mgmt_class,
+					     mad->mad_hdr.method);
+				return -EINVAL;
+			}
+		}
+		break;
+	case IB_MGMT_CLASS_SUBN_ADM:
+		if (mlx4_ib_demux_sa_handler(ibdev, port, slave,
+					     (struct ib_sa_mad *) mad))
+			return 0;
+		break;
+	case IB_MGMT_CLASS_CM:
+		if (mlx4_ib_demux_cm_handler(ibdev, port, &slave, mad))
+			return 0;
+		break;
+	case IB_MGMT_CLASS_DEVICE_MGMT:
+		if (mad->mad_hdr.method != IB_MGMT_METHOD_GET_RESP)
+			return 0;
+		break;
+	default:
+		/* Drop unsupported classes for slaves in tunnel mode */
+		if (slave != mlx4_master_func_num(dev->dev)) {
+			pr_debug("dropping unsupported ingress mad from class:%d "
+				 "for slave:%d\n", mad->mad_hdr.mgmt_class, slave);
+			return 0;
+		}
+	}
+	/*make sure that no slave==255 was not handled yet.*/
+	if (slave >= dev->dev->caps.sqp_demux) {
+		mlx4_ib_warn(ibdev, "slave id: %d is bigger than allowed:%d\n",
+			     slave, dev->dev->caps.sqp_demux);
+		return -ENOENT;
+	}
+
+	err = mlx4_ib_send_to_slave(dev, slave, port, wc->qp->qp_type, wc, grh, mad);
+	if (err)
+		pr_debug("failed sending to slave %d via tunnel qp (%d)\n",
+			 slave, err);
+	return 0;
+}
+
+static int ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
+			const struct ib_wc *in_wc, const struct ib_grh *in_grh,
+			const struct ib_mad *in_mad, struct ib_mad *out_mad)
+{
+	u16 slid, prev_lid = 0;
+	int err;
+	struct ib_port_attr pattr;
+
+	if (in_wc && in_wc->qp->qp_num) {
+		pr_debug("received MAD: slid:%d sqpn:%d "
+			"dlid_bits:%d dqpn:%d wc_flags:0x%x, cls %x, mtd %x, atr %x\n",
+			in_wc->slid, in_wc->src_qp,
+			in_wc->dlid_path_bits,
+			in_wc->qp->qp_num,
+			in_wc->wc_flags,
+			in_mad->mad_hdr.mgmt_class, in_mad->mad_hdr.method,
+			be16_to_cpu(in_mad->mad_hdr.attr_id));
+		if (in_wc->wc_flags & IB_WC_GRH) {
+			pr_debug("sgid_hi:0x%016llx sgid_lo:0x%016llx\n",
+				 be64_to_cpu(in_grh->sgid.global.subnet_prefix),
+				 be64_to_cpu(in_grh->sgid.global.interface_id));
+			pr_debug("dgid_hi:0x%016llx dgid_lo:0x%016llx\n",
+				 be64_to_cpu(in_grh->dgid.global.subnet_prefix),
+				 be64_to_cpu(in_grh->dgid.global.interface_id));
+		}
+	}
+
+	slid = in_wc ? ib_lid_cpu16(in_wc->slid) : be16_to_cpu(IB_LID_PERMISSIVE);
+
+	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP && slid == 0) {
+		forward_trap(to_mdev(ibdev), port_num, in_mad);
+		return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
+	}
+
+	if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
+	    in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) {
+		if (in_mad->mad_hdr.method   != IB_MGMT_METHOD_GET &&
+		    in_mad->mad_hdr.method   != IB_MGMT_METHOD_SET &&
+		    in_mad->mad_hdr.method   != IB_MGMT_METHOD_TRAP_REPRESS)
+			return IB_MAD_RESULT_SUCCESS;
+
+		/*
+		 * Don't process SMInfo queries -- the SMA can't handle them.
+		 */
+		if (in_mad->mad_hdr.attr_id == IB_SMP_ATTR_SM_INFO)
+			return IB_MAD_RESULT_SUCCESS;
+	} else if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT ||
+		   in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS1   ||
+		   in_mad->mad_hdr.mgmt_class == MLX4_IB_VENDOR_CLASS2   ||
+		   in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_CONG_MGMT) {
+		if (in_mad->mad_hdr.method  != IB_MGMT_METHOD_GET &&
+		    in_mad->mad_hdr.method  != IB_MGMT_METHOD_SET)
+			return IB_MAD_RESULT_SUCCESS;
+	} else
+		return IB_MAD_RESULT_SUCCESS;
+
+	if ((in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_LID_ROUTED ||
+	     in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE) &&
+	    in_mad->mad_hdr.method == IB_MGMT_METHOD_SET &&
+	    in_mad->mad_hdr.attr_id == IB_SMP_ATTR_PORT_INFO &&
+	    !ib_query_port(ibdev, port_num, &pattr))
+		prev_lid = ib_lid_cpu16(pattr.lid);
+
+	err = mlx4_MAD_IFC(to_mdev(ibdev),
+			   (mad_flags & IB_MAD_IGNORE_MKEY ? MLX4_MAD_IFC_IGNORE_MKEY : 0) |
+			   (mad_flags & IB_MAD_IGNORE_BKEY ? MLX4_MAD_IFC_IGNORE_BKEY : 0) |
+			   MLX4_MAD_IFC_NET_VIEW,
+			   port_num, in_wc, in_grh, in_mad, out_mad);
+	if (err)
+		return IB_MAD_RESULT_FAILURE;
+
+	if (!out_mad->mad_hdr.status) {
+		smp_snoop(ibdev, port_num, in_mad, prev_lid);
+		/* slaves get node desc from FW */
+		if (!mlx4_is_slave(to_mdev(ibdev)->dev))
+			node_desc_override(ibdev, out_mad);
+	}
+
+	/* set return bit in status of directed route responses */
+	if (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE)
+		out_mad->mad_hdr.status |= cpu_to_be16(1 << 15);
+
+	if (in_mad->mad_hdr.method == IB_MGMT_METHOD_TRAP_REPRESS)
+		/* no response for trap repress */
+		return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_CONSUMED;
+
+	return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
+}
+
+static void edit_counter(struct mlx4_counter *cnt, void *counters,
+			 __be16 attr_id)
+{
+	switch (attr_id) {
+	case IB_PMA_PORT_COUNTERS:
+	{
+		struct ib_pma_portcounters *pma_cnt =
+			(struct ib_pma_portcounters *)counters;
+
+		ASSIGN_32BIT_COUNTER(pma_cnt->port_xmit_data,
+				     (be64_to_cpu(cnt->tx_bytes) >> 2));
+		ASSIGN_32BIT_COUNTER(pma_cnt->port_rcv_data,
+				     (be64_to_cpu(cnt->rx_bytes) >> 2));
+		ASSIGN_32BIT_COUNTER(pma_cnt->port_xmit_packets,
+				     be64_to_cpu(cnt->tx_frames));
+		ASSIGN_32BIT_COUNTER(pma_cnt->port_rcv_packets,
+				     be64_to_cpu(cnt->rx_frames));
+		break;
+	}
+	case IB_PMA_PORT_COUNTERS_EXT:
+	{
+		struct ib_pma_portcounters_ext *pma_cnt_ext =
+			(struct ib_pma_portcounters_ext *)counters;
+
+		pma_cnt_ext->port_xmit_data =
+			cpu_to_be64(be64_to_cpu(cnt->tx_bytes) >> 2);
+		pma_cnt_ext->port_rcv_data =
+			cpu_to_be64(be64_to_cpu(cnt->rx_bytes) >> 2);
+		pma_cnt_ext->port_xmit_packets = cnt->tx_frames;
+		pma_cnt_ext->port_rcv_packets = cnt->rx_frames;
+		break;
+	}
+	}
+}
+
+static int iboe_process_mad_port_info(void *out_mad)
+{
+	struct ib_class_port_info cpi = {};
+
+	cpi.capability_mask = IB_PMA_CLASS_CAP_EXT_WIDTH;
+	memcpy(out_mad, &cpi, sizeof(cpi));
+	return IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
+}
+
+static int iboe_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
+			const struct ib_wc *in_wc, const struct ib_grh *in_grh,
+			const struct ib_mad *in_mad, struct ib_mad *out_mad)
+{
+	struct mlx4_counter counter_stats;
+	struct mlx4_ib_dev *dev = to_mdev(ibdev);
+	struct counter_index *tmp_counter;
+	int err = IB_MAD_RESULT_FAILURE, stats_avail = 0;
+
+	if (in_mad->mad_hdr.mgmt_class != IB_MGMT_CLASS_PERF_MGMT)
+		return -EINVAL;
+
+	if (in_mad->mad_hdr.attr_id == IB_PMA_CLASS_PORT_INFO)
+		return iboe_process_mad_port_info((void *)(out_mad->data + 40));
+
+	memset(&counter_stats, 0, sizeof(counter_stats));
+	mutex_lock(&dev->counters_table[port_num - 1].mutex);
+	list_for_each_entry(tmp_counter,
+			    &dev->counters_table[port_num - 1].counters_list,
+			    list) {
+		err = mlx4_get_counter_stats(dev->dev,
+					     tmp_counter->index,
+					     &counter_stats, 0);
+		if (err) {
+			err = IB_MAD_RESULT_FAILURE;
+			stats_avail = 0;
+			break;
+		}
+		stats_avail = 1;
+	}
+	mutex_unlock(&dev->counters_table[port_num - 1].mutex);
+	if (stats_avail) {
+		memset(out_mad->data, 0, sizeof out_mad->data);
+		switch (counter_stats.counter_mode & 0xf) {
+		case 0:
+			edit_counter(&counter_stats,
+				     (void *)(out_mad->data + 40),
+				     in_mad->mad_hdr.attr_id);
+			err = IB_MAD_RESULT_SUCCESS | IB_MAD_RESULT_REPLY;
+			break;
+		default:
+			err = IB_MAD_RESULT_FAILURE;
+		}
+	}
+
+	return err;
+}
+
+int mlx4_ib_process_mad(struct ib_device *ibdev, int mad_flags, u8 port_num,
+			const struct ib_wc *in_wc, const struct ib_grh *in_grh,
+			const struct ib_mad_hdr *in, size_t in_mad_size,
+			struct ib_mad_hdr *out, size_t *out_mad_size,
+			u16 *out_mad_pkey_index)
+{
+	struct mlx4_ib_dev *dev = to_mdev(ibdev);
+	const struct ib_mad *in_mad = (const struct ib_mad *)in;
+	struct ib_mad *out_mad = (struct ib_mad *)out;
+	enum rdma_link_layer link = rdma_port_get_link_layer(ibdev, port_num);
+
+	if (WARN_ON_ONCE(in_mad_size != sizeof(*in_mad) ||
+			 *out_mad_size != sizeof(*out_mad)))
+		return IB_MAD_RESULT_FAILURE;
+
+	/* iboe_process_mad() which uses the HCA flow-counters to implement IB PMA
+	 * queries, should be called only by VFs and for that specific purpose
+	 */
+	if (link == IB_LINK_LAYER_INFINIBAND) {
+		if (mlx4_is_slave(dev->dev) &&
+		    (in_mad->mad_hdr.mgmt_class == IB_MGMT_CLASS_PERF_MGMT &&
+		     (in_mad->mad_hdr.attr_id == IB_PMA_PORT_COUNTERS ||
+		      in_mad->mad_hdr.attr_id == IB_PMA_PORT_COUNTERS_EXT ||
+		      in_mad->mad_hdr.attr_id == IB_PMA_CLASS_PORT_INFO)))
+			return iboe_process_mad(ibdev, mad_flags, port_num, in_wc,
+						in_grh, in_mad, out_mad);
+
+		return ib_process_mad(ibdev, mad_flags, port_num, in_wc,
+				      in_grh, in_mad, out_mad);
+	}
+
+	if (link == IB_LINK_LAYER_ETHERNET)
+		return iboe_process_mad(ibdev, mad_flags, port_num, in_wc,
+					in_grh, in_mad, out_mad);
+
+	return -EINVAL;
+}
+
+static void send_handler(struct ib_mad_agent *agent,
+			 struct ib_mad_send_wc *mad_send_wc)
+{
+	if (mad_send_wc->send_buf->context[0])
+		rdma_destroy_ah(mad_send_wc->send_buf->context[0]);
+	ib_free_send_mad(mad_send_wc->send_buf);
+}
+
+int mlx4_ib_mad_init(struct mlx4_ib_dev *dev)
+{
+	struct ib_mad_agent *agent;
+	int p, q;
+	int ret;
+	enum rdma_link_layer ll;
+
+	for (p = 0; p < dev->num_ports; ++p) {
+		ll = rdma_port_get_link_layer(&dev->ib_dev, p + 1);
+		for (q = 0; q <= 1; ++q) {
+			if (ll == IB_LINK_LAYER_INFINIBAND) {
+				agent = ib_register_mad_agent(&dev->ib_dev, p + 1,
+							      q ? IB_QPT_GSI : IB_QPT_SMI,
+							      NULL, 0, send_handler,
+							      NULL, NULL, 0);
+				if (IS_ERR(agent)) {
+					ret = PTR_ERR(agent);
+					goto err;
+				}
+				dev->send_agent[p][q] = agent;
+			} else
+				dev->send_agent[p][q] = NULL;
+		}
+	}
+
+	return 0;
+
+err:
+	for (p = 0; p < dev->num_ports; ++p)
+		for (q = 0; q <= 1; ++q)
+			if (dev->send_agent[p][q])
+				ib_unregister_mad_agent(dev->send_agent[p][q]);
+
+	return ret;
+}
+
+void mlx4_ib_mad_cleanup(struct mlx4_ib_dev *dev)
+{
+	struct ib_mad_agent *agent;
+	int p, q;
+
+	for (p = 0; p < dev->num_ports; ++p) {
+		for (q = 0; q <= 1; ++q) {
+			agent = dev->send_agent[p][q];
+			if (agent) {
+				dev->send_agent[p][q] = NULL;
+				ib_unregister_mad_agent(agent);
+			}
+		}
+
+		if (dev->sm_ah[p])
+			rdma_destroy_ah(dev->sm_ah[p]);
+	}
+}
+
+static void handle_lid_change_event(struct mlx4_ib_dev *dev, u8 port_num)
+{
+	mlx4_ib_dispatch_event(dev, port_num, IB_EVENT_LID_CHANGE);
+
+	if (mlx4_is_master(dev->dev) && !dev->sriov.is_going_down)
+		mlx4_gen_slaves_port_mgt_ev(dev->dev, port_num,
+					    MLX4_EQ_PORT_INFO_LID_CHANGE_MASK);
+}
+
+static void handle_client_rereg_event(struct mlx4_ib_dev *dev, u8 port_num)
+{
+	/* re-configure the alias-guid and mcg's */
+	if (mlx4_is_master(dev->dev)) {
+		mlx4_ib_invalidate_all_guid_record(dev, port_num);
+
+		if (!dev->sriov.is_going_down) {
+			mlx4_ib_mcg_port_cleanup(&dev->sriov.demux[port_num - 1], 0);
+			mlx4_gen_slaves_port_mgt_ev(dev->dev, port_num,
+						    MLX4_EQ_PORT_INFO_CLIENT_REREG_MASK);
+		}
+	}
+
+	/* Update the sl to vl table from inside client rereg
+	 * only if in secure-host mode (snooping is not possible)
+	 * and the sl-to-vl change event is not generated by FW.
+	 */
+	if (!mlx4_is_slave(dev->dev) &&
+	    dev->dev->flags & MLX4_FLAG_SECURE_HOST &&
+	    !(dev->dev->caps.flags2 & MLX4_DEV_CAP_FLAG2_SL_TO_VL_CHANGE_EVENT)) {
+		if (mlx4_is_master(dev->dev))
+			/* already in work queue from mlx4_ib_event queueing
+			 * mlx4_handle_port_mgmt_change_event, which calls
+			 * this procedure. Therefore, call sl2vl_update directly.
+			 */
+			mlx4_ib_sl2vl_update(dev, port_num);
+		else
+			mlx4_sched_ib_sl2vl_update_work(dev, port_num);
+	}
+	mlx4_ib_dispatch_event(dev, port_num, IB_EVENT_CLIENT_REREGISTER);
+}
+
+static void propagate_pkey_ev(struct mlx4_ib_dev *dev, int port_num,
+			      struct mlx4_eqe *eqe)
+{
+	__propagate_pkey_ev(dev, port_num, GET_BLK_PTR_FROM_EQE(eqe),
+			    GET_MASK_FROM_EQE(eqe));
+}
+
+static void handle_slaves_guid_change(struct mlx4_ib_dev *dev, u8 port_num,
+				      u32 guid_tbl_blk_num, u32 change_bitmap)
+{
+	struct ib_smp *in_mad  = NULL;
+	struct ib_smp *out_mad  = NULL;
+	u16 i;
+
+	if (!mlx4_is_mfunc(dev->dev) || !mlx4_is_master(dev->dev))
+		return;
+
+	in_mad  = kmalloc(sizeof *in_mad, GFP_KERNEL);
+	out_mad = kmalloc(sizeof *out_mad, GFP_KERNEL);
+	if (!in_mad || !out_mad)
+		goto out;
+
+	guid_tbl_blk_num  *= 4;
+
+	for (i = 0; i < 4; i++) {
+		if (change_bitmap && (!((change_bitmap >> (8 * i)) & 0xff)))
+			continue;
+		memset(in_mad, 0, sizeof *in_mad);
+		memset(out_mad, 0, sizeof *out_mad);
+
+		in_mad->base_version  = 1;
+		in_mad->mgmt_class    = IB_MGMT_CLASS_SUBN_LID_ROUTED;
+		in_mad->class_version = 1;
+		in_mad->method        = IB_MGMT_METHOD_GET;
+		in_mad->attr_id       = IB_SMP_ATTR_GUID_INFO;
+		in_mad->attr_mod      = cpu_to_be32(guid_tbl_blk_num + i);
+
+		if (mlx4_MAD_IFC(dev,
+				 MLX4_MAD_IFC_IGNORE_KEYS | MLX4_MAD_IFC_NET_VIEW,
+				 port_num, NULL, NULL, in_mad, out_mad)) {
+			mlx4_ib_warn(&dev->ib_dev, "Failed in get GUID INFO MAD_IFC\n");
+			goto out;
+		}
+
+		mlx4_ib_update_cache_on_guid_change(dev, guid_tbl_blk_num + i,
+						    port_num,
+						    (u8 *)(&((struct ib_smp *)out_mad)->data));
+		mlx4_ib_notify_slaves_on_guid_change(dev, guid_tbl_blk_num + i,
+						     port_num,
+						     (u8 *)(&((struct ib_smp *)out_mad)->data));
+	}
+
+out:
+	kfree(in_mad);
+	kfree(out_mad);
+	return;
+}
+
+void handle_port_mgmt_change_event(struct work_struct *work)
+{
+	struct ib_event_work *ew = container_of(work, struct ib_event_work, work);
+	struct mlx4_ib_dev *dev = ew->ib_dev;
+	struct mlx4_eqe *eqe = &(ew->ib_eqe);
+	u8 port = eqe->event.port_mgmt_change.port;
+	u32 changed_attr;
+	u32 tbl_block;
+	u32 change_bitmap;
+
+	switch (eqe->subtype) {
+	case MLX4_DEV_PMC_SUBTYPE_PORT_INFO:
+		changed_attr = be32_to_cpu(eqe->event.port_mgmt_change.params.port_info.changed_attr);
+
+		/* Update the SM ah - This should be done before handling
+		   the other changed attributes so that MADs can be sent to the SM */
+		if (changed_attr & MSTR_SM_CHANGE_MASK) {
+			u16 lid = be16_to_cpu(eqe->event.port_mgmt_change.params.port_info.mstr_sm_lid);
+			u8 sl = eqe->event.port_mgmt_change.params.port_info.mstr_sm_sl & 0xf;
+			update_sm_ah(dev, port, lid, sl);
+		}
+
+		/* Check if it is a lid change event */
+		if (changed_attr & MLX4_EQ_PORT_INFO_LID_CHANGE_MASK)
+			handle_lid_change_event(dev, port);
+
+		/* Generate GUID changed event */
+		if (changed_attr & MLX4_EQ_PORT_INFO_GID_PFX_CHANGE_MASK) {
+			if (mlx4_is_master(dev->dev)) {
+				union ib_gid gid;
+				int err = 0;
+
+				if (!eqe->event.port_mgmt_change.params.port_info.gid_prefix)
+					err = __mlx4_ib_query_gid(&dev->ib_dev, port, 0, &gid, 1);
+				else
+					gid.global.subnet_prefix =
+						eqe->event.port_mgmt_change.params.port_info.gid_prefix;
+				if (err) {
+					pr_warn("Could not change QP1 subnet prefix for port %d: query_gid error (%d)\n",
+						port, err);
+				} else {
+					pr_debug("Changing QP1 subnet prefix for port %d. old=0x%llx. new=0x%llx\n",
+						 port,
+						 (u64)atomic64_read(&dev->sriov.demux[port - 1].subnet_prefix),
+						 be64_to_cpu(gid.global.subnet_prefix));
+					atomic64_set(&dev->sriov.demux[port - 1].subnet_prefix,
+						     be64_to_cpu(gid.global.subnet_prefix));
+				}
+			}
+			mlx4_ib_dispatch_event(dev, port, IB_EVENT_GID_CHANGE);
+			/*if master, notify all slaves*/
+			if (mlx4_is_master(dev->dev))
+				mlx4_gen_slaves_port_mgt_ev(dev->dev, port,
+							    MLX4_EQ_PORT_INFO_GID_PFX_CHANGE_MASK);
+		}
+
+		if (changed_attr & MLX4_EQ_PORT_INFO_CLIENT_REREG_MASK)
+			handle_client_rereg_event(dev, port);
+		break;
+
+	case MLX4_DEV_PMC_SUBTYPE_PKEY_TABLE:
+		mlx4_ib_dispatch_event(dev, port, IB_EVENT_PKEY_CHANGE);
+		if (mlx4_is_master(dev->dev) && !dev->sriov.is_going_down)
+			propagate_pkey_ev(dev, port, eqe);
+		break;
+	case MLX4_DEV_PMC_SUBTYPE_GUID_INFO:
+		/* paravirtualized master's guid is guid 0 -- does not change */
+		if (!mlx4_is_master(dev->dev))
+			mlx4_ib_dispatch_event(dev, port, IB_EVENT_GID_CHANGE);
+		/*if master, notify relevant slaves*/
+		else if (!dev->sriov.is_going_down) {
+			tbl_block = GET_BLK_PTR_FROM_EQE(eqe);
+			change_bitmap = GET_MASK_FROM_EQE(eqe);
+			handle_slaves_guid_change(dev, port, tbl_block, change_bitmap);
+		}
+		break;
+
+	case MLX4_DEV_PMC_SUBTYPE_SL_TO_VL_MAP:
+		/* cache sl to vl mapping changes for use in
+		 * filling QP1 LRH VL field when sending packets
+		 */
+		if (!mlx4_is_slave(dev->dev)) {
+			union sl2vl_tbl_to_u64 sl2vl64;
+			int jj;
+
+			for (jj = 0; jj < 8; jj++) {
+				sl2vl64.sl8[jj] =
+					eqe->event.port_mgmt_change.params.sl2vl_tbl_change_info.sl2vl_table[jj];
+				pr_debug("port %u, sl2vl[%d] = %02x\n",
+					 port, jj, sl2vl64.sl8[jj]);
+			}
+			atomic64_set(&dev->sl2vl[port - 1], sl2vl64.sl64);
+		}
+		break;
+	default:
+		pr_warn("Unsupported subtype 0x%x for "
+			"Port Management Change event\n", eqe->subtype);
+	}
+
+	kfree(ew);
+}
+
+void mlx4_ib_dispatch_event(struct mlx4_ib_dev *dev, u8 port_num,
+			    enum ib_event_type type)
+{
+	struct ib_event event;
+
+	event.device		= &dev->ib_dev;
+	event.element.port_num	= port_num;
+	event.event		= type;
+
+	ib_dispatch_event(&event);
+}
+
+static void mlx4_ib_tunnel_comp_handler(struct ib_cq *cq, void *arg)
+{
+	unsigned long flags;
+	struct mlx4_ib_demux_pv_ctx *ctx = cq->cq_context;
+	struct mlx4_ib_dev *dev = to_mdev(ctx->ib_dev);
+	spin_lock_irqsave(&dev->sriov.going_down_lock, flags);
+	if (!dev->sriov.is_going_down && ctx->state == DEMUX_PV_STATE_ACTIVE)
+		queue_work(ctx->wq, &ctx->work);
+	spin_unlock_irqrestore(&dev->sriov.going_down_lock, flags);
+}
+
+static void mlx4_ib_wire_comp_handler(struct ib_cq *cq, void *arg)
+{
+	unsigned long flags;
+	struct mlx4_ib_demux_pv_ctx *ctx = cq->cq_context;
+	struct mlx4_ib_dev *dev = to_mdev(ctx->ib_dev);
+
+	spin_lock_irqsave(&dev->sriov.going_down_lock, flags);
+	if (!dev->sriov.is_going_down && ctx->state == DEMUX_PV_STATE_ACTIVE)
+		queue_work(ctx->wi_wq, &ctx->work);
+	spin_unlock_irqrestore(&dev->sriov.going_down_lock, flags);
+}
+
+static int mlx4_ib_post_pv_qp_buf(struct mlx4_ib_demux_pv_ctx *ctx,
+				  struct mlx4_ib_demux_pv_qp *tun_qp,
+				  int index)
+{
+	struct ib_sge sg_list;
+	struct ib_recv_wr recv_wr;
+	const struct ib_recv_wr *bad_recv_wr;
+	int size;
+
+	size = (tun_qp->qp->qp_type == IB_QPT_UD) ?
+		sizeof (struct mlx4_tunnel_mad) : sizeof (struct mlx4_mad_rcv_buf);
+
+	sg_list.addr = tun_qp->ring[index].map;
+	sg_list.length = size;
+	sg_list.lkey = ctx->pd->local_dma_lkey;
+
+	recv_wr.next = NULL;
+	recv_wr.sg_list = &sg_list;
+	recv_wr.num_sge = 1;
+	recv_wr.wr_id = (u64) index | MLX4_TUN_WRID_RECV |
+		MLX4_TUN_SET_WRID_QPN(tun_qp->proxy_qpt);
+	ib_dma_sync_single_for_device(ctx->ib_dev, tun_qp->ring[index].map,
+				      size, DMA_FROM_DEVICE);
+	return ib_post_recv(tun_qp->qp, &recv_wr, &bad_recv_wr);
+}
+
+static int mlx4_ib_multiplex_sa_handler(struct ib_device *ibdev, int port,
+		int slave, struct ib_sa_mad *sa_mad)
+{
+	int ret = 0;
+
+	/* dispatch to different sa handlers */
+	switch (be16_to_cpu(sa_mad->mad_hdr.attr_id)) {
+	case IB_SA_ATTR_MC_MEMBER_REC:
+		ret = mlx4_ib_mcg_multiplex_handler(ibdev, port, slave, sa_mad);
+		break;
+	default:
+		break;
+	}
+	return ret;
+}
+
+static int is_proxy_qp0(struct mlx4_ib_dev *dev, int qpn, int slave)
+{
+	int proxy_start = dev->dev->phys_caps.base_proxy_sqpn + 8 * slave;
+
+	return (qpn >= proxy_start && qpn <= proxy_start + 1);
+}
+
+
+int mlx4_ib_send_to_wire(struct mlx4_ib_dev *dev, int slave, u8 port,
+			 enum ib_qp_type dest_qpt, u16 pkey_index,
+			 u32 remote_qpn, u32 qkey, struct rdma_ah_attr *attr,
+			 u8 *s_mac, u16 vlan_id, struct ib_mad *mad)
+{
+	struct ib_sge list;
+	struct ib_ud_wr wr;
+	const struct ib_send_wr *bad_wr;
+	struct mlx4_ib_demux_pv_ctx *sqp_ctx;
+	struct mlx4_ib_demux_pv_qp *sqp;
+	struct mlx4_mad_snd_buf *sqp_mad;
+	struct ib_ah *ah;
+	struct ib_qp *send_qp = NULL;
+	unsigned wire_tx_ix = 0;
+	int ret = 0;
+	u16 wire_pkey_ix;
+	int src_qpnum;
+
+	sqp_ctx = dev->sriov.sqps[port-1];
+
+	/* check if proxy qp created */
+	if (!sqp_ctx || sqp_ctx->state != DEMUX_PV_STATE_ACTIVE)
+		return -EAGAIN;
+
+	if (dest_qpt == IB_QPT_SMI) {
+		src_qpnum = 0;
+		sqp = &sqp_ctx->qp[0];
+		wire_pkey_ix = dev->pkeys.virt2phys_pkey[slave][port - 1][0];
+	} else {
+		src_qpnum = 1;
+		sqp = &sqp_ctx->qp[1];
+		wire_pkey_ix = dev->pkeys.virt2phys_pkey[slave][port - 1][pkey_index];
+	}
+
+	send_qp = sqp->qp;
+
+	/* create ah */
+	ah = mlx4_ib_create_ah_slave(sqp_ctx->pd, attr,
+				     rdma_ah_retrieve_grh(attr)->sgid_index,
+				     s_mac, vlan_id);
+	if (IS_ERR(ah))
+		return -ENOMEM;
+	spin_lock(&sqp->tx_lock);
+	if (sqp->tx_ix_head - sqp->tx_ix_tail >=
+	    (MLX4_NUM_TUNNEL_BUFS - 1))
+		ret = -EAGAIN;
+	else
+		wire_tx_ix = (++sqp->tx_ix_head) & (MLX4_NUM_TUNNEL_BUFS - 1);
+	spin_unlock(&sqp->tx_lock);
+	if (ret)
+		goto out;
+
+	sqp_mad = (struct mlx4_mad_snd_buf *) (sqp->tx_ring[wire_tx_ix].buf.addr);
+	if (sqp->tx_ring[wire_tx_ix].ah)
+		rdma_destroy_ah(sqp->tx_ring[wire_tx_ix].ah);
+	sqp->tx_ring[wire_tx_ix].ah = ah;
+	ib_dma_sync_single_for_cpu(&dev->ib_dev,
+				   sqp->tx_ring[wire_tx_ix].buf.map,
+				   sizeof (struct mlx4_mad_snd_buf),
+				   DMA_TO_DEVICE);
+
+	memcpy(&sqp_mad->payload, mad, sizeof *mad);
+
+	ib_dma_sync_single_for_device(&dev->ib_dev,
+				      sqp->tx_ring[wire_tx_ix].buf.map,
+				      sizeof (struct mlx4_mad_snd_buf),
+				      DMA_TO_DEVICE);
+
+	list.addr = sqp->tx_ring[wire_tx_ix].buf.map;
+	list.length = sizeof (struct mlx4_mad_snd_buf);
+	list.lkey = sqp_ctx->pd->local_dma_lkey;
+
+	wr.ah = ah;
+	wr.port_num = port;
+	wr.pkey_index = wire_pkey_ix;
+	wr.remote_qkey = qkey;
+	wr.remote_qpn = remote_qpn;
+	wr.wr.next = NULL;
+	wr.wr.wr_id = ((u64) wire_tx_ix) | MLX4_TUN_SET_WRID_QPN(src_qpnum);
+	wr.wr.sg_list = &list;
+	wr.wr.num_sge = 1;
+	wr.wr.opcode = IB_WR_SEND;
+	wr.wr.send_flags = IB_SEND_SIGNALED;
+
+	ret = ib_post_send(send_qp, &wr.wr, &bad_wr);
+	if (!ret)
+		return 0;
+
+	spin_lock(&sqp->tx_lock);
+	sqp->tx_ix_tail++;
+	spin_unlock(&sqp->tx_lock);
+	sqp->tx_ring[wire_tx_ix].ah = NULL;
+out:
+	mlx4_ib_destroy_ah(ah);
+	return ret;
+}
+
+static int get_slave_base_gid_ix(struct mlx4_ib_dev *dev, int slave, int port)
+{
+	if (rdma_port_get_link_layer(&dev->ib_dev, port) == IB_LINK_LAYER_INFINIBAND)
+		return slave;
+	return mlx4_get_base_gid_ix(dev->dev, slave, port);
+}
+
+static void fill_in_real_sgid_index(struct mlx4_ib_dev *dev, int slave, int port,
+				    struct rdma_ah_attr *ah_attr)
+{
+	struct ib_global_route *grh = rdma_ah_retrieve_grh(ah_attr);
+	if (rdma_port_get_link_layer(&dev->ib_dev, port) == IB_LINK_LAYER_INFINIBAND)
+		grh->sgid_index = slave;
+	else
+		grh->sgid_index += get_slave_base_gid_ix(dev, slave, port);
+}
+
+static void mlx4_ib_multiplex_mad(struct mlx4_ib_demux_pv_ctx *ctx, struct ib_wc *wc)
+{
+	struct mlx4_ib_dev *dev = to_mdev(ctx->ib_dev);
+	struct mlx4_ib_demux_pv_qp *tun_qp = &ctx->qp[MLX4_TUN_WRID_QPN(wc->wr_id)];
+	int wr_ix = wc->wr_id & (MLX4_NUM_TUNNEL_BUFS - 1);
+	struct mlx4_tunnel_mad *tunnel = tun_qp->ring[wr_ix].addr;
+	struct mlx4_ib_ah ah;
+	struct rdma_ah_attr ah_attr;
+	u8 *slave_id;
+	int slave;
+	int port;
+	u16 vlan_id;
+	u8 qos;
+	u8 *dmac;
+
+	/* Get slave that sent this packet */
+	if (wc->src_qp < dev->dev->phys_caps.base_proxy_sqpn ||
+	    wc->src_qp >= dev->dev->phys_caps.base_proxy_sqpn + 8 * MLX4_MFUNC_MAX ||
+	    (wc->src_qp & 0x1) != ctx->port - 1 ||
+	    wc->src_qp & 0x4) {
+		mlx4_ib_warn(ctx->ib_dev, "can't multiplex bad sqp:%d\n", wc->src_qp);
+		return;
+	}
+	slave = ((wc->src_qp & ~0x7) - dev->dev->phys_caps.base_proxy_sqpn) / 8;
+	if (slave != ctx->slave) {
+		mlx4_ib_warn(ctx->ib_dev, "can't multiplex bad sqp:%d: "
+			     "belongs to another slave\n", wc->src_qp);
+		return;
+	}
+
+	/* Map transaction ID */
+	ib_dma_sync_single_for_cpu(ctx->ib_dev, tun_qp->ring[wr_ix].map,
+				   sizeof (struct mlx4_tunnel_mad),
+				   DMA_FROM_DEVICE);
+	switch (tunnel->mad.mad_hdr.method) {
+	case IB_MGMT_METHOD_SET:
+	case IB_MGMT_METHOD_GET:
+	case IB_MGMT_METHOD_REPORT:
+	case IB_SA_METHOD_GET_TABLE:
+	case IB_SA_METHOD_DELETE:
+	case IB_SA_METHOD_GET_MULTI:
+	case IB_SA_METHOD_GET_TRACE_TBL:
+		slave_id = (u8 *) &tunnel->mad.mad_hdr.tid;
+		if (*slave_id) {
+			mlx4_ib_warn(ctx->ib_dev, "egress mad has non-null tid msb:%d "
+				     "class:%d slave:%d\n", *slave_id,
+				     tunnel->mad.mad_hdr.mgmt_class, slave);
+			return;
+		} else
+			*slave_id = slave;
+	default:
+		/* nothing */;
+	}
+
+	/* Class-specific handling */
+	switch (tunnel->mad.mad_hdr.mgmt_class) {
+	case IB_MGMT_CLASS_SUBN_LID_ROUTED:
+	case IB_MGMT_CLASS_SUBN_DIRECTED_ROUTE:
+		if (slave != mlx4_master_func_num(dev->dev) &&
+		    !mlx4_vf_smi_enabled(dev->dev, slave, ctx->port))
+			return;
+		break;
+	case IB_MGMT_CLASS_SUBN_ADM:
+		if (mlx4_ib_multiplex_sa_handler(ctx->ib_dev, ctx->port, slave,
+			      (struct ib_sa_mad *) &tunnel->mad))
+			return;
+		break;
+	case IB_MGMT_CLASS_CM:
+		if (mlx4_ib_multiplex_cm_handler(ctx->ib_dev, ctx->port, slave,
+			      (struct ib_mad *) &tunnel->mad))
+			return;
+		break;
+	case IB_MGMT_CLASS_DEVICE_MGMT:
+		if (tunnel->mad.mad_hdr.method != IB_MGMT_METHOD_GET &&
+		    tunnel->mad.mad_hdr.method != IB_MGMT_METHOD_SET)
+			return;
+		break;
+	default:
+		/* Drop unsupported classes for slaves in tunnel mode */
+		if (slave != mlx4_master_func_num(dev->dev)) {
+			mlx4_ib_warn(ctx->ib_dev, "dropping unsupported egress mad from class:%d "
+				     "for slave:%d\n", tunnel->mad.mad_hdr.mgmt_class, slave);
+			return;
+		}
+	}
+
+	/* We are using standard ib_core services to send the mad, so generate a
+	 * stadard address handle by decoding the tunnelled mlx4_ah fields */
+	memcpy(&ah.av, &tunnel->hdr.av, sizeof (struct mlx4_av));
+	ah.ibah.device = ctx->ib_dev;
+
+	port = be32_to_cpu(ah.av.ib.port_pd) >> 24;
+	port = mlx4_slave_convert_port(dev->dev, slave, port);
+	if (port < 0)
+		return;
+	ah.av.ib.port_pd = cpu_to_be32(port << 24 | (be32_to_cpu(ah.av.ib.port_pd) & 0xffffff));
+	ah.ibah.type = rdma_ah_find_type(&dev->ib_dev, port);
+
+	mlx4_ib_query_ah(&ah.ibah, &ah_attr);
+	if (rdma_ah_get_ah_flags(&ah_attr) & IB_AH_GRH)
+		fill_in_real_sgid_index(dev, slave, ctx->port, &ah_attr);
+	dmac = rdma_ah_retrieve_dmac(&ah_attr);
+	if (dmac)
+		memcpy(dmac, tunnel->hdr.mac, ETH_ALEN);
+	vlan_id = be16_to_cpu(tunnel->hdr.vlan);
+	/* if slave have default vlan use it */
+	if (mlx4_get_slave_default_vlan(dev->dev, ctx->port, slave,
+					&vlan_id, &qos))
+		rdma_ah_set_sl(&ah_attr, qos);
+
+	mlx4_ib_send_to_wire(dev, slave, ctx->port,
+			     is_proxy_qp0(dev, wc->src_qp, slave) ?
+			     IB_QPT_SMI : IB_QPT_GSI,
+			     be16_to_cpu(tunnel->hdr.pkey_index),
+			     be32_to_cpu(tunnel->hdr.remote_qpn),
+			     be32_to_cpu(tunnel->hdr.qkey),
+			     &ah_attr, wc->smac, vlan_id, &tunnel->mad);
+}
+
+static int mlx4_ib_alloc_pv_bufs(struct mlx4_ib_demux_pv_ctx *ctx,
+				 enum ib_qp_type qp_type, int is_tun)
+{
+	int i;
+	struct mlx4_ib_demux_pv_qp *tun_qp;
+	int rx_buf_size, tx_buf_size;
+
+	if (qp_type > IB_QPT_GSI)
+		return -EINVAL;
+
+	tun_qp = &ctx->qp[qp_type];
+
+	tun_qp->ring = kcalloc(MLX4_NUM_TUNNEL_BUFS,
+			       sizeof(struct mlx4_ib_buf),
+			       GFP_KERNEL);
+	if (!tun_qp->ring)
+		return -ENOMEM;
+
+	tun_qp->tx_ring = kcalloc(MLX4_NUM_TUNNEL_BUFS,
+				  sizeof (struct mlx4_ib_tun_tx_buf),
+				  GFP_KERNEL);
+	if (!tun_qp->tx_ring) {
+		kfree(tun_qp->ring);
+		tun_qp->ring = NULL;
+		return -ENOMEM;
+	}
+
+	if (is_tun) {
+		rx_buf_size = sizeof (struct mlx4_tunnel_mad);
+		tx_buf_size = sizeof (struct mlx4_rcv_tunnel_mad);
+	} else {
+		rx_buf_size = sizeof (struct mlx4_mad_rcv_buf);
+		tx_buf_size = sizeof (struct mlx4_mad_snd_buf);
+	}
+
+	for (i = 0; i < MLX4_NUM_TUNNEL_BUFS; i++) {
+		tun_qp->ring[i].addr = kmalloc(rx_buf_size, GFP_KERNEL);
+		if (!tun_qp->ring[i].addr)
+			goto err;
+		tun_qp->ring[i].map = ib_dma_map_single(ctx->ib_dev,
+							tun_qp->ring[i].addr,
+							rx_buf_size,
+							DMA_FROM_DEVICE);
+		if (ib_dma_mapping_error(ctx->ib_dev, tun_qp->ring[i].map)) {
+			kfree(tun_qp->ring[i].addr);
+			goto err;
+		}
+	}
+
+	for (i = 0; i < MLX4_NUM_TUNNEL_BUFS; i++) {
+		tun_qp->tx_ring[i].buf.addr =
+			kmalloc(tx_buf_size, GFP_KERNEL);
+		if (!tun_qp->tx_ring[i].buf.addr)
+			goto tx_err;
+		tun_qp->tx_ring[i].buf.map =
+			ib_dma_map_single(ctx->ib_dev,
+					  tun_qp->tx_ring[i].buf.addr,
+					  tx_buf_size,
+					  DMA_TO_DEVICE);
+		if (ib_dma_mapping_error(ctx->ib_dev,
+					 tun_qp->tx_ring[i].buf.map)) {
+			kfree(tun_qp->tx_ring[i].buf.addr);
+			goto tx_err;
+		}
+		tun_qp->tx_ring[i].ah = NULL;
+	}
+	spin_lock_init(&tun_qp->tx_lock);
+	tun_qp->tx_ix_head = 0;
+	tun_qp->tx_ix_tail = 0;
+	tun_qp->proxy_qpt = qp_type;
+
+	return 0;
+
+tx_err:
+	while (i > 0) {
+		--i;
+		ib_dma_unmap_single(ctx->ib_dev, tun_qp->tx_ring[i].buf.map,
+				    tx_buf_size, DMA_TO_DEVICE);
+		kfree(tun_qp->tx_ring[i].buf.addr);
+	}
+	i = MLX4_NUM_TUNNEL_BUFS;
+err:
+	while (i > 0) {
+		--i;
+		ib_dma_unmap_single(ctx->ib_dev, tun_qp->ring[i].map,
+				    rx_buf_size, DMA_FROM_DEVICE);
+		kfree(tun_qp->ring[i].addr);
+	}
+	kfree(tun_qp->tx_ring);
+	tun_qp->tx_ring = NULL;
+	kfree(tun_qp->ring);
+	tun_qp->ring = NULL;
+	return -ENOMEM;
+}
+
+static void mlx4_ib_free_pv_qp_bufs(struct mlx4_ib_demux_pv_ctx *ctx,
+				     enum ib_qp_type qp_type, int is_tun)
+{
+	int i;
+	struct mlx4_ib_demux_pv_qp *tun_qp;
+	int rx_buf_size, tx_buf_size;
+
+	if (qp_type > IB_QPT_GSI)
+		return;
+
+	tun_qp = &ctx->qp[qp_type];
+	if (is_tun) {
+		rx_buf_size = sizeof (struct mlx4_tunnel_mad);
+		tx_buf_size = sizeof (struct mlx4_rcv_tunnel_mad);
+	} else {
+		rx_buf_size = sizeof (struct mlx4_mad_rcv_buf);
+		tx_buf_size = sizeof (struct mlx4_mad_snd_buf);
+	}
+
+
+	for (i = 0; i < MLX4_NUM_TUNNEL_BUFS; i++) {
+		ib_dma_unmap_single(ctx->ib_dev, tun_qp->ring[i].map,
+				    rx_buf_size, DMA_FROM_DEVICE);
+		kfree(tun_qp->ring[i].addr);
+	}
+
+	for (i = 0; i < MLX4_NUM_TUNNEL_BUFS; i++) {
+		ib_dma_unmap_single(ctx->ib_dev, tun_qp->tx_ring[i].buf.map,
+				    tx_buf_size, DMA_TO_DEVICE);
+		kfree(tun_qp->tx_ring[i].buf.addr);
+		if (tun_qp->tx_ring[i].ah)
+			rdma_destroy_ah(tun_qp->tx_ring[i].ah);
+	}
+	kfree(tun_qp->tx_ring);
+	kfree(tun_qp->ring);
+}
+
+static void mlx4_ib_tunnel_comp_worker(struct work_struct *work)
+{
+	struct mlx4_ib_demux_pv_ctx *ctx;
+	struct mlx4_ib_demux_pv_qp *tun_qp;
+	struct ib_wc wc;
+	int ret;
+	ctx = container_of(work, struct mlx4_ib_demux_pv_ctx, work);
+	ib_req_notify_cq(ctx->cq, IB_CQ_NEXT_COMP);
+
+	while (ib_poll_cq(ctx->cq, 1, &wc) == 1) {
+		tun_qp = &ctx->qp[MLX4_TUN_WRID_QPN(wc.wr_id)];
+		if (wc.status == IB_WC_SUCCESS) {
+			switch (wc.opcode) {
+			case IB_WC_RECV:
+				mlx4_ib_multiplex_mad(ctx, &wc);
+				ret = mlx4_ib_post_pv_qp_buf(ctx, tun_qp,
+							     wc.wr_id &
+							     (MLX4_NUM_TUNNEL_BUFS - 1));
+				if (ret)
+					pr_err("Failed reposting tunnel "
+					       "buf:%lld\n", wc.wr_id);
+				break;
+			case IB_WC_SEND:
+				pr_debug("received tunnel send completion:"
+					 "wrid=0x%llx, status=0x%x\n",
+					 wc.wr_id, wc.status);
+				rdma_destroy_ah(tun_qp->tx_ring[wc.wr_id &
+					      (MLX4_NUM_TUNNEL_BUFS - 1)].ah);
+				tun_qp->tx_ring[wc.wr_id & (MLX4_NUM_TUNNEL_BUFS - 1)].ah
+					= NULL;
+				spin_lock(&tun_qp->tx_lock);
+				tun_qp->tx_ix_tail++;
+				spin_unlock(&tun_qp->tx_lock);
+
+				break;
+			default:
+				break;
+			}
+		} else  {
+			pr_debug("mlx4_ib: completion error in tunnel: %d."
+				 " status = %d, wrid = 0x%llx\n",
+				 ctx->slave, wc.status, wc.wr_id);
+			if (!MLX4_TUN_IS_RECV(wc.wr_id)) {
+				rdma_destroy_ah(tun_qp->tx_ring[wc.wr_id &
+					      (MLX4_NUM_TUNNEL_BUFS - 1)].ah);
+				tun_qp->tx_ring[wc.wr_id & (MLX4_NUM_TUNNEL_BUFS - 1)].ah
+					= NULL;
+				spin_lock(&tun_qp->tx_lock);
+				tun_qp->tx_ix_tail++;
+				spin_unlock(&tun_qp->tx_lock);
+			}
+		}
+	}
+}
+
+static void pv_qp_event_handler(struct ib_event *event, void *qp_context)
+{
+	struct mlx4_ib_demux_pv_ctx *sqp = qp_context;
+
+	/* It's worse than that! He's dead, Jim! */
+	pr_err("Fatal error (%d) on a MAD QP on port %d\n",
+	       event->event, sqp->port);
+}
+
+static int create_pv_sqp(struct mlx4_ib_demux_pv_ctx *ctx,
+			    enum ib_qp_type qp_type, int create_tun)
+{
+	int i, ret;
+	struct mlx4_ib_demux_pv_qp *tun_qp;
+	struct mlx4_ib_qp_tunnel_init_attr qp_init_attr;
+	struct ib_qp_attr attr;
+	int qp_attr_mask_INIT;
+
+	if (qp_type > IB_QPT_GSI)
+		return -EINVAL;
+
+	tun_qp = &ctx->qp[qp_type];
+
+	memset(&qp_init_attr, 0, sizeof qp_init_attr);
+	qp_init_attr.init_attr.send_cq = ctx->cq;
+	qp_init_attr.init_attr.recv_cq = ctx->cq;
+	qp_init_attr.init_attr.sq_sig_type = IB_SIGNAL_ALL_WR;
+	qp_init_attr.init_attr.cap.max_send_wr = MLX4_NUM_TUNNEL_BUFS;
+	qp_init_attr.init_attr.cap.max_recv_wr = MLX4_NUM_TUNNEL_BUFS;
+	qp_init_attr.init_attr.cap.max_send_sge = 1;
+	qp_init_attr.init_attr.cap.max_recv_sge = 1;
+	if (create_tun) {
+		qp_init_attr.init_attr.qp_type = IB_QPT_UD;
+		qp_init_attr.init_attr.create_flags = MLX4_IB_SRIOV_TUNNEL_QP;
+		qp_init_attr.port = ctx->port;
+		qp_init_attr.slave = ctx->slave;
+		qp_init_attr.proxy_qp_type = qp_type;
+		qp_attr_mask_INIT = IB_QP_STATE | IB_QP_PKEY_INDEX |
+			   IB_QP_QKEY | IB_QP_PORT;
+	} else {
+		qp_init_attr.init_attr.qp_type = qp_type;
+		qp_init_attr.init_attr.create_flags = MLX4_IB_SRIOV_SQP;
+		qp_attr_mask_INIT = IB_QP_STATE | IB_QP_PKEY_INDEX | IB_QP_QKEY;
+	}
+	qp_init_attr.init_attr.port_num = ctx->port;
+	qp_init_attr.init_attr.qp_context = ctx;
+	qp_init_attr.init_attr.event_handler = pv_qp_event_handler;
+	tun_qp->qp = ib_create_qp(ctx->pd, &qp_init_attr.init_attr);
+	if (IS_ERR(tun_qp->qp)) {
+		ret = PTR_ERR(tun_qp->qp);
+		tun_qp->qp = NULL;
+		pr_err("Couldn't create %s QP (%d)\n",
+		       create_tun ? "tunnel" : "special", ret);
+		return ret;
+	}
+
+	memset(&attr, 0, sizeof attr);
+	attr.qp_state = IB_QPS_INIT;
+	ret = 0;
+	if (create_tun)
+		ret = find_slave_port_pkey_ix(to_mdev(ctx->ib_dev), ctx->slave,
+					      ctx->port, IB_DEFAULT_PKEY_FULL,
+					      &attr.pkey_index);
+	if (ret || !create_tun)
+		attr.pkey_index =
+			to_mdev(ctx->ib_dev)->pkeys.virt2phys_pkey[ctx->slave][ctx->port - 1][0];
+	attr.qkey = IB_QP1_QKEY;
+	attr.port_num = ctx->port;
+	ret = ib_modify_qp(tun_qp->qp, &attr, qp_attr_mask_INIT);
+	if (ret) {
+		pr_err("Couldn't change %s qp state to INIT (%d)\n",
+		       create_tun ? "tunnel" : "special", ret);
+		goto err_qp;
+	}
+	attr.qp_state = IB_QPS_RTR;
+	ret = ib_modify_qp(tun_qp->qp, &attr, IB_QP_STATE);
+	if (ret) {
+		pr_err("Couldn't change %s qp state to RTR (%d)\n",
+		       create_tun ? "tunnel" : "special", ret);
+		goto err_qp;
+	}
+	attr.qp_state = IB_QPS_RTS;
+	attr.sq_psn = 0;
+	ret = ib_modify_qp(tun_qp->qp, &attr, IB_QP_STATE | IB_QP_SQ_PSN);
+	if (ret) {
+		pr_err("Couldn't change %s qp state to RTS (%d)\n",
+		       create_tun ? "tunnel" : "special", ret);
+		goto err_qp;
+	}
+
+	for (i = 0; i < MLX4_NUM_TUNNEL_BUFS; i++) {
+		ret = mlx4_ib_post_pv_qp_buf(ctx, tun_qp, i);
+		if (ret) {
+			pr_err(" mlx4_ib_post_pv_buf error"
+			       " (err = %d, i = %d)\n", ret, i);
+			goto err_qp;
+		}
+	}
+	return 0;
+
+err_qp:
+	ib_destroy_qp(tun_qp->qp);
+	tun_qp->qp = NULL;
+	return ret;
+}
+
+/*
+ * IB MAD completion callback for real SQPs
+ */
+static void mlx4_ib_sqp_comp_worker(struct work_struct *work)
+{
+	struct mlx4_ib_demux_pv_ctx *ctx;
+	struct mlx4_ib_demux_pv_qp *sqp;
+	struct ib_wc wc;
+	struct ib_grh *grh;
+	struct ib_mad *mad;
+
+	ctx = container_of(work, struct mlx4_ib_demux_pv_ctx, work);
+	ib_req_notify_cq(ctx->cq, IB_CQ_NEXT_COMP);
+
+	while (mlx4_ib_poll_cq(ctx->cq, 1, &wc) == 1) {
+		sqp = &ctx->qp[MLX4_TUN_WRID_QPN(wc.wr_id)];
+		if (wc.status == IB_WC_SUCCESS) {
+			switch (wc.opcode) {
+			case IB_WC_SEND:
+				rdma_destroy_ah(sqp->tx_ring[wc.wr_id &
+					      (MLX4_NUM_TUNNEL_BUFS - 1)].ah);
+				sqp->tx_ring[wc.wr_id & (MLX4_NUM_TUNNEL_BUFS - 1)].ah
+					= NULL;
+				spin_lock(&sqp->tx_lock);
+				sqp->tx_ix_tail++;
+				spin_unlock(&sqp->tx_lock);
+				break;
+			case IB_WC_RECV:
+				mad = (struct ib_mad *) &(((struct mlx4_mad_rcv_buf *)
+						(sqp->ring[wc.wr_id &
+						(MLX4_NUM_TUNNEL_BUFS - 1)].addr))->payload);
+				grh = &(((struct mlx4_mad_rcv_buf *)
+						(sqp->ring[wc.wr_id &
+						(MLX4_NUM_TUNNEL_BUFS - 1)].addr))->grh);
+				mlx4_ib_demux_mad(ctx->ib_dev, ctx->port, &wc, grh, mad);
+				if (mlx4_ib_post_pv_qp_buf(ctx, sqp, wc.wr_id &
+							   (MLX4_NUM_TUNNEL_BUFS - 1)))
+					pr_err("Failed reposting SQP "
+					       "buf:%lld\n", wc.wr_id);
+				break;
+			default:
+				break;
+			}
+		} else  {
+			pr_debug("mlx4_ib: completion error in tunnel: %d."
+				 " status = %d, wrid = 0x%llx\n",
+				 ctx->slave, wc.status, wc.wr_id);
+			if (!MLX4_TUN_IS_RECV(wc.wr_id)) {
+				rdma_destroy_ah(sqp->tx_ring[wc.wr_id &
+					      (MLX4_NUM_TUNNEL_BUFS - 1)].ah);
+				sqp->tx_ring[wc.wr_id & (MLX4_NUM_TUNNEL_BUFS - 1)].ah
+					= NULL;
+				spin_lock(&sqp->tx_lock);
+				sqp->tx_ix_tail++;
+				spin_unlock(&sqp->tx_lock);
+			}
+		}
+	}
+}
+
+static int alloc_pv_object(struct mlx4_ib_dev *dev, int slave, int port,
+			       struct mlx4_ib_demux_pv_ctx **ret_ctx)
+{
+	struct mlx4_ib_demux_pv_ctx *ctx;
+
+	*ret_ctx = NULL;
+	ctx = kzalloc(sizeof (struct mlx4_ib_demux_pv_ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	ctx->ib_dev = &dev->ib_dev;
+	ctx->port = port;
+	ctx->slave = slave;
+	*ret_ctx = ctx;
+	return 0;
+}
+
+static void free_pv_object(struct mlx4_ib_dev *dev, int slave, int port)
+{
+	if (dev->sriov.demux[port - 1].tun[slave]) {
+		kfree(dev->sriov.demux[port - 1].tun[slave]);
+		dev->sriov.demux[port - 1].tun[slave] = NULL;
+	}
+}
+
+static int create_pv_resources(struct ib_device *ibdev, int slave, int port,
+			       int create_tun, struct mlx4_ib_demux_pv_ctx *ctx)
+{
+	int ret, cq_size;
+	struct ib_cq_init_attr cq_attr = {};
+
+	if (ctx->state != DEMUX_PV_STATE_DOWN)
+		return -EEXIST;
+
+	ctx->state = DEMUX_PV_STATE_STARTING;
+	/* have QP0 only if link layer is IB */
+	if (rdma_port_get_link_layer(ibdev, ctx->port) ==
+	    IB_LINK_LAYER_INFINIBAND)
+		ctx->has_smi = 1;
+
+	if (ctx->has_smi) {
+		ret = mlx4_ib_alloc_pv_bufs(ctx, IB_QPT_SMI, create_tun);
+		if (ret) {
+			pr_err("Failed allocating qp0 tunnel bufs (%d)\n", ret);
+			goto err_out;
+		}
+	}
+
+	ret = mlx4_ib_alloc_pv_bufs(ctx, IB_QPT_GSI, create_tun);
+	if (ret) {
+		pr_err("Failed allocating qp1 tunnel bufs (%d)\n", ret);
+		goto err_out_qp0;
+	}
+
+	cq_size = 2 * MLX4_NUM_TUNNEL_BUFS;
+	if (ctx->has_smi)
+		cq_size *= 2;
+
+	cq_attr.cqe = cq_size;
+	ctx->cq = ib_create_cq(ctx->ib_dev,
+			       create_tun ? mlx4_ib_tunnel_comp_handler : mlx4_ib_wire_comp_handler,
+			       NULL, ctx, &cq_attr);
+	if (IS_ERR(ctx->cq)) {
+		ret = PTR_ERR(ctx->cq);
+		pr_err("Couldn't create tunnel CQ (%d)\n", ret);
+		goto err_buf;
+	}
+
+	ctx->pd = ib_alloc_pd(ctx->ib_dev, 0);
+	if (IS_ERR(ctx->pd)) {
+		ret = PTR_ERR(ctx->pd);
+		pr_err("Couldn't create tunnel PD (%d)\n", ret);
+		goto err_cq;
+	}
+
+	if (ctx->has_smi) {
+		ret = create_pv_sqp(ctx, IB_QPT_SMI, create_tun);
+		if (ret) {
+			pr_err("Couldn't create %s QP0 (%d)\n",
+			       create_tun ? "tunnel for" : "",  ret);
+			goto err_pd;
+		}
+	}
+
+	ret = create_pv_sqp(ctx, IB_QPT_GSI, create_tun);
+	if (ret) {
+		pr_err("Couldn't create %s QP1 (%d)\n",
+		       create_tun ? "tunnel for" : "",  ret);
+		goto err_qp0;
+	}
+
+	if (create_tun)
+		INIT_WORK(&ctx->work, mlx4_ib_tunnel_comp_worker);
+	else
+		INIT_WORK(&ctx->work, mlx4_ib_sqp_comp_worker);
+
+	ctx->wq = to_mdev(ibdev)->sriov.demux[port - 1].wq;
+	ctx->wi_wq = to_mdev(ibdev)->sriov.demux[port - 1].wi_wq;
+
+	ret = ib_req_notify_cq(ctx->cq, IB_CQ_NEXT_COMP);
+	if (ret) {
+		pr_err("Couldn't arm tunnel cq (%d)\n", ret);
+		goto err_wq;
+	}
+	ctx->state = DEMUX_PV_STATE_ACTIVE;
+	return 0;
+
+err_wq:
+	ctx->wq = NULL;
+	ib_destroy_qp(ctx->qp[1].qp);
+	ctx->qp[1].qp = NULL;
+
+
+err_qp0:
+	if (ctx->has_smi)
+		ib_destroy_qp(ctx->qp[0].qp);
+	ctx->qp[0].qp = NULL;
+
+err_pd:
+	ib_dealloc_pd(ctx->pd);
+	ctx->pd = NULL;
+
+err_cq:
+	ib_destroy_cq(ctx->cq);
+	ctx->cq = NULL;
+
+err_buf:
+	mlx4_ib_free_pv_qp_bufs(ctx, IB_QPT_GSI, create_tun);
+
+err_out_qp0:
+	if (ctx->has_smi)
+		mlx4_ib_free_pv_qp_bufs(ctx, IB_QPT_SMI, create_tun);
+err_out:
+	ctx->state = DEMUX_PV_STATE_DOWN;
+	return ret;
+}
+
+static void destroy_pv_resources(struct mlx4_ib_dev *dev, int slave, int port,
+				 struct mlx4_ib_demux_pv_ctx *ctx, int flush)
+{
+	if (!ctx)
+		return;
+	if (ctx->state > DEMUX_PV_STATE_DOWN) {
+		ctx->state = DEMUX_PV_STATE_DOWNING;
+		if (flush)
+			flush_workqueue(ctx->wq);
+		if (ctx->has_smi) {
+			ib_destroy_qp(ctx->qp[0].qp);
+			ctx->qp[0].qp = NULL;
+			mlx4_ib_free_pv_qp_bufs(ctx, IB_QPT_SMI, 1);
+		}
+		ib_destroy_qp(ctx->qp[1].qp);
+		ctx->qp[1].qp = NULL;
+		mlx4_ib_free_pv_qp_bufs(ctx, IB_QPT_GSI, 1);
+		ib_dealloc_pd(ctx->pd);
+		ctx->pd = NULL;
+		ib_destroy_cq(ctx->cq);
+		ctx->cq = NULL;
+		ctx->state = DEMUX_PV_STATE_DOWN;
+	}
+}
+
+static int mlx4_ib_tunnels_update(struct mlx4_ib_dev *dev, int slave,
+				  int port, int do_init)
+{
+	int ret = 0;
+
+	if (!do_init) {
+		clean_vf_mcast(&dev->sriov.demux[port - 1], slave);
+		/* for master, destroy real sqp resources */
+		if (slave == mlx4_master_func_num(dev->dev))
+			destroy_pv_resources(dev, slave, port,
+					     dev->sriov.sqps[port - 1], 1);
+		/* destroy the tunnel qp resources */
+		destroy_pv_resources(dev, slave, port,
+				     dev->sriov.demux[port - 1].tun[slave], 1);
+		return 0;
+	}
+
+	/* create the tunnel qp resources */
+	ret = create_pv_resources(&dev->ib_dev, slave, port, 1,
+				  dev->sriov.demux[port - 1].tun[slave]);
+
+	/* for master, create the real sqp resources */
+	if (!ret && slave == mlx4_master_func_num(dev->dev))
+		ret = create_pv_resources(&dev->ib_dev, slave, port, 0,
+					  dev->sriov.sqps[port - 1]);
+	return ret;
+}
+
+void mlx4_ib_tunnels_update_work(struct work_struct *work)
+{
+	struct mlx4_ib_demux_work *dmxw;
+
+	dmxw = container_of(work, struct mlx4_ib_demux_work, work);
+	mlx4_ib_tunnels_update(dmxw->dev, dmxw->slave, (int) dmxw->port,
+			       dmxw->do_init);
+	kfree(dmxw);
+	return;
+}
+
+static int mlx4_ib_alloc_demux_ctx(struct mlx4_ib_dev *dev,
+				       struct mlx4_ib_demux_ctx *ctx,
+				       int port)
+{
+	char name[12];
+	int ret = 0;
+	int i;
+
+	ctx->tun = kcalloc(dev->dev->caps.sqp_demux,
+			   sizeof (struct mlx4_ib_demux_pv_ctx *), GFP_KERNEL);
+	if (!ctx->tun)
+		return -ENOMEM;
+
+	ctx->dev = dev;
+	ctx->port = port;
+	ctx->ib_dev = &dev->ib_dev;
+
+	for (i = 0;
+	     i < min(dev->dev->caps.sqp_demux,
+	     (u16)(dev->dev->persist->num_vfs + 1));
+	     i++) {
+		struct mlx4_active_ports actv_ports =
+			mlx4_get_active_ports(dev->dev, i);
+
+		if (!test_bit(port - 1, actv_ports.ports))
+			continue;
+
+		ret = alloc_pv_object(dev, i, port, &ctx->tun[i]);
+		if (ret) {
+			ret = -ENOMEM;
+			goto err_mcg;
+		}
+	}
+
+	ret = mlx4_ib_mcg_port_init(ctx);
+	if (ret) {
+		pr_err("Failed initializing mcg para-virt (%d)\n", ret);
+		goto err_mcg;
+	}
+
+	snprintf(name, sizeof(name), "mlx4_ibt%d", port);
+	ctx->wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
+	if (!ctx->wq) {
+		pr_err("Failed to create tunnelling WQ for port %d\n", port);
+		ret = -ENOMEM;
+		goto err_wq;
+	}
+
+	snprintf(name, sizeof(name), "mlx4_ibwi%d", port);
+	ctx->wi_wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
+	if (!ctx->wi_wq) {
+		pr_err("Failed to create wire WQ for port %d\n", port);
+		ret = -ENOMEM;
+		goto err_wiwq;
+	}
+
+	snprintf(name, sizeof(name), "mlx4_ibud%d", port);
+	ctx->ud_wq = alloc_ordered_workqueue(name, WQ_MEM_RECLAIM);
+	if (!ctx->ud_wq) {
+		pr_err("Failed to create up/down WQ for port %d\n", port);
+		ret = -ENOMEM;
+		goto err_udwq;
+	}
+
+	return 0;
+
+err_udwq:
+	destroy_workqueue(ctx->wi_wq);
+	ctx->wi_wq = NULL;
+
+err_wiwq:
+	destroy_workqueue(ctx->wq);
+	ctx->wq = NULL;
+
+err_wq:
+	mlx4_ib_mcg_port_cleanup(ctx, 1);
+err_mcg:
+	for (i = 0; i < dev->dev->caps.sqp_demux; i++)
+		free_pv_object(dev, i, port);
+	kfree(ctx->tun);
+	ctx->tun = NULL;
+	return ret;
+}
+
+static void mlx4_ib_free_sqp_ctx(struct mlx4_ib_demux_pv_ctx *sqp_ctx)
+{
+	if (sqp_ctx->state > DEMUX_PV_STATE_DOWN) {
+		sqp_ctx->state = DEMUX_PV_STATE_DOWNING;
+		flush_workqueue(sqp_ctx->wq);
+		if (sqp_ctx->has_smi) {
+			ib_destroy_qp(sqp_ctx->qp[0].qp);
+			sqp_ctx->qp[0].qp = NULL;
+			mlx4_ib_free_pv_qp_bufs(sqp_ctx, IB_QPT_SMI, 0);
+		}
+		ib_destroy_qp(sqp_ctx->qp[1].qp);
+		sqp_ctx->qp[1].qp = NULL;
+		mlx4_ib_free_pv_qp_bufs(sqp_ctx, IB_QPT_GSI, 0);
+		ib_dealloc_pd(sqp_ctx->pd);
+		sqp_ctx->pd = NULL;
+		ib_destroy_cq(sqp_ctx->cq);
+		sqp_ctx->cq = NULL;
+		sqp_ctx->state = DEMUX_PV_STATE_DOWN;
+	}
+}
+
+static void mlx4_ib_free_demux_ctx(struct mlx4_ib_demux_ctx *ctx)
+{
+	int i;
+	if (ctx) {
+		struct mlx4_ib_dev *dev = to_mdev(ctx->ib_dev);
+		mlx4_ib_mcg_port_cleanup(ctx, 1);
+		for (i = 0; i < dev->dev->caps.sqp_demux; i++) {
+			if (!ctx->tun[i])
+				continue;
+			if (ctx->tun[i]->state > DEMUX_PV_STATE_DOWN)
+				ctx->tun[i]->state = DEMUX_PV_STATE_DOWNING;
+		}
+		flush_workqueue(ctx->wq);
+		flush_workqueue(ctx->wi_wq);
+		for (i = 0; i < dev->dev->caps.sqp_demux; i++) {
+			destroy_pv_resources(dev, i, ctx->port, ctx->tun[i], 0);
+			free_pv_object(dev, i, ctx->port);
+		}
+		kfree(ctx->tun);
+		destroy_workqueue(ctx->ud_wq);
+		destroy_workqueue(ctx->wi_wq);
+		destroy_workqueue(ctx->wq);
+	}
+}
+
+static void mlx4_ib_master_tunnels(struct mlx4_ib_dev *dev, int do_init)
+{
+	int i;
+
+	if (!mlx4_is_master(dev->dev))
+		return;
+	/* initialize or tear down tunnel QPs for the master */
+	for (i = 0; i < dev->dev->caps.num_ports; i++)
+		mlx4_ib_tunnels_update(dev, mlx4_master_func_num(dev->dev), i + 1, do_init);
+	return;
+}
+
+int mlx4_ib_init_sriov(struct mlx4_ib_dev *dev)
+{
+	int i = 0;
+	int err;
+
+	if (!mlx4_is_mfunc(dev->dev))
+		return 0;
+
+	dev->sriov.is_going_down = 0;
+	spin_lock_init(&dev->sriov.going_down_lock);
+	mlx4_ib_cm_paravirt_init(dev);
+
+	mlx4_ib_warn(&dev->ib_dev, "multi-function enabled\n");
+
+	if (mlx4_is_slave(dev->dev)) {
+		mlx4_ib_warn(&dev->ib_dev, "operating in qp1 tunnel mode\n");
+		return 0;
+	}
+
+	for (i = 0; i < dev->dev->caps.sqp_demux; i++) {
+		if (i == mlx4_master_func_num(dev->dev))
+			mlx4_put_slave_node_guid(dev->dev, i, dev->ib_dev.node_guid);
+		else
+			mlx4_put_slave_node_guid(dev->dev, i, mlx4_ib_gen_node_guid());
+	}
+
+	err = mlx4_ib_init_alias_guid_service(dev);
+	if (err) {
+		mlx4_ib_warn(&dev->ib_dev, "Failed init alias guid process.\n");
+		goto paravirt_err;
+	}
+	err = mlx4_ib_device_register_sysfs(dev);
+	if (err) {
+		mlx4_ib_warn(&dev->ib_dev, "Failed to register sysfs\n");
+		goto sysfs_err;
+	}
+
+	mlx4_ib_warn(&dev->ib_dev, "initializing demux service for %d qp1 clients\n",
+		     dev->dev->caps.sqp_demux);
+	for (i = 0; i < dev->num_ports; i++) {
+		union ib_gid gid;
+		err = __mlx4_ib_query_gid(&dev->ib_dev, i + 1, 0, &gid, 1);
+		if (err)
+			goto demux_err;
+		dev->sriov.demux[i].guid_cache[0] = gid.global.interface_id;
+		atomic64_set(&dev->sriov.demux[i].subnet_prefix,
+			     be64_to_cpu(gid.global.subnet_prefix));
+		err = alloc_pv_object(dev, mlx4_master_func_num(dev->dev), i + 1,
+				      &dev->sriov.sqps[i]);
+		if (err)
+			goto demux_err;
+		err = mlx4_ib_alloc_demux_ctx(dev, &dev->sriov.demux[i], i + 1);
+		if (err)
+			goto free_pv;
+	}
+	mlx4_ib_master_tunnels(dev, 1);
+	return 0;
+
+free_pv:
+	free_pv_object(dev, mlx4_master_func_num(dev->dev), i + 1);
+demux_err:
+	while (--i >= 0) {
+		free_pv_object(dev, mlx4_master_func_num(dev->dev), i + 1);
+		mlx4_ib_free_demux_ctx(&dev->sriov.demux[i]);
+	}
+	mlx4_ib_device_unregister_sysfs(dev);
+
+sysfs_err:
+	mlx4_ib_destroy_alias_guid_service(dev);
+
+paravirt_err:
+	mlx4_ib_cm_paravirt_clean(dev, -1);
+
+	return err;
+}
+
+void mlx4_ib_close_sriov(struct mlx4_ib_dev *dev)
+{
+	int i;
+	unsigned long flags;
+
+	if (!mlx4_is_mfunc(dev->dev))
+		return;
+
+	spin_lock_irqsave(&dev->sriov.going_down_lock, flags);
+	dev->sriov.is_going_down = 1;
+	spin_unlock_irqrestore(&dev->sriov.going_down_lock, flags);
+	if (mlx4_is_master(dev->dev)) {
+		for (i = 0; i < dev->num_ports; i++) {
+			flush_workqueue(dev->sriov.demux[i].ud_wq);
+			mlx4_ib_free_sqp_ctx(dev->sriov.sqps[i]);
+			kfree(dev->sriov.sqps[i]);
+			dev->sriov.sqps[i] = NULL;
+			mlx4_ib_free_demux_ctx(&dev->sriov.demux[i]);
+		}
+
+		mlx4_ib_cm_paravirt_clean(dev, -1);
+		mlx4_ib_destroy_alias_guid_service(dev);
+		mlx4_ib_device_unregister_sysfs(dev);
+	}
+}