[ofa-general] [PATCH 5 of 5] mlx4: XRC implementation

Jack Morgenstein jackm at dev.mellanox.co.il
Tue Sep 18 10:27:36 PDT 2007


mlx4: Implements XRC support.

Signed-off-by: Jack Morgenstein <jackm at dev.mellanox.co.il>

Index: ofed_kernel/include/linux/mlx4/device.h
===================================================================
--- ofed_kernel.orig/include/linux/mlx4/device.h	2007-09-18 12:14:40.223721000 +0200
+++ ofed_kernel/include/linux/mlx4/device.h	2007-09-18 12:15:27.919989000 +0200
@@ -56,6 +56,7 @@ enum {
 	MLX4_DEV_CAP_FLAG_RC		= 1 <<  0,
 	MLX4_DEV_CAP_FLAG_UC		= 1 <<  1,
 	MLX4_DEV_CAP_FLAG_UD		= 1 <<  2,
+	MLX4_DEV_CAP_FLAG_XRC		= 1 <<  3,
 	MLX4_DEV_CAP_FLAG_SRQ		= 1 <<  6,
 	MLX4_DEV_CAP_FLAG_IPOIB_CSUM	= 1 <<  7,
 	MLX4_DEV_CAP_FLAG_BAD_PKEY_CNTR	= 1 <<  8,
@@ -176,6 +177,8 @@ struct mlx4_caps {
 	int			num_pds;
 	int			reserved_pds;
 	int			mtt_entry_sz;
+	int			reserved_xrcds;
+	int			max_xrcds;
 	u32			max_msg_sz;
 	u32			page_size_cap;
 	u32			flags;
@@ -313,6 +316,9 @@ void mlx4_buf_free(struct mlx4_dev *dev,
 int mlx4_pd_alloc(struct mlx4_dev *dev, u32 *pdn);
 void mlx4_pd_free(struct mlx4_dev *dev, u32 pdn);
 
+int mlx4_xrcd_alloc(struct mlx4_dev *dev, u32 *xrcdn);
+void mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn);
+
 int mlx4_uar_alloc(struct mlx4_dev *dev, struct mlx4_uar *uar);
 void mlx4_uar_free(struct mlx4_dev *dev, struct mlx4_uar *uar);
 
@@ -337,8 +343,8 @@ void mlx4_cq_free(struct mlx4_dev *dev, 
 int mlx4_qp_alloc(struct mlx4_dev *dev, int sqpn, struct mlx4_qp *qp);
 void mlx4_qp_free(struct mlx4_dev *dev, int is_sqp, struct mlx4_qp *qp);
 
-int mlx4_srq_alloc(struct mlx4_dev *dev, u32 pdn, struct mlx4_mtt *mtt,
-		   u64 db_rec, struct mlx4_srq *srq);
+int mlx4_srq_alloc(struct mlx4_dev *dev, u32 pdn, u32 cqn, u16 xrcd,
+		   struct mlx4_mtt *mtt, u64 db_rec, struct mlx4_srq *srq);
 void mlx4_srq_free(struct mlx4_dev *dev, struct mlx4_srq *srq);
 int mlx4_srq_arm(struct mlx4_dev *dev, struct mlx4_srq *srq, int limit_watermark);
 int mlx4_srq_query(struct mlx4_dev *dev, struct mlx4_srq *srq, int *limit_watermark);
Index: ofed_kernel/drivers/infiniband/hw/mlx4/main.c
===================================================================
--- ofed_kernel.orig/drivers/infiniband/hw/mlx4/main.c	2007-09-18 12:14:40.231717000 +0200
+++ ofed_kernel/drivers/infiniband/hw/mlx4/main.c	2007-09-18 12:15:27.927990000 +0200
@@ -104,6 +104,8 @@ static int mlx4_ib_query_device(struct i
 		props->device_cap_flags |= IB_DEVICE_IP_CSUM;
 	if (dev->dev->caps.max_gso_sz)
 		props->device_cap_flags |= IB_DEVICE_TCP_GSO;
+	if (dev->dev->caps.flags & MLX4_DEV_CAP_FLAG_XRC)
+		props->device_cap_flags |= IB_DEVICE_XRC;
 
 	props->vendor_id	   = be32_to_cpup((__be32 *) (out_mad->data + 36)) &
 		0xffffff;
@@ -447,6 +449,46 @@ static int mlx4_ib_mcg_detach(struct ib_
 				     &to_mqp(ibqp)->mqp, gid->raw);
 }
 
+static struct ib_xrcd *mlx4_ib_alloc_xrcd(struct ib_device *ibdev,
+					  struct ib_ucontext *context,
+					  struct ib_udata *udata)
+{
+	struct mlx4_ib_xrcd *xrcd;
+	struct mlx4_ib_dev *mdev = to_mdev(ibdev);
+	int err;
+
+	if (!(mdev->dev->caps.flags & MLX4_DEV_CAP_FLAG_XRC))
+		return ERR_PTR(-ENOSYS);
+
+	xrcd = kmalloc(sizeof *xrcd, GFP_KERNEL);
+	if (!xrcd)
+		return ERR_PTR(-ENOMEM);
+
+	err = mlx4_xrcd_alloc(mdev->dev, &xrcd->xrcdn);
+	if (err) {
+		kfree(xrcd);
+		return ERR_PTR(err);
+	}
+
+	if (context)
+		if (ib_copy_to_udata(udata, &xrcd->xrcdn, sizeof (__u32))) {
+			mlx4_xrcd_free(mdev->dev, xrcd->xrcdn);
+			kfree(xrcd);
+			return ERR_PTR(-EFAULT);
+		}
+
+	return &xrcd->ibxrcd;
+}
+
+static int mlx4_ib_dealloc_xrcd(struct ib_xrcd *xrcd)
+{
+	mlx4_xrcd_free(to_mdev(xrcd->device)->dev, to_mxrcd(xrcd)->xrcdn);
+	kfree(xrcd);
+
+	return 0;
+}
+
+
 static int init_node_data(struct mlx4_ib_dev *dev)
 {
 	struct ib_smp *in_mad  = NULL;
@@ -630,6 +672,16 @@ static void *mlx4_ib_add(struct mlx4_dev
 	ibdev->ib_dev.map_phys_fmr	= mlx4_ib_map_phys_fmr;
 	ibdev->ib_dev.unmap_fmr		= mlx4_ib_unmap_fmr;
 	ibdev->ib_dev.dealloc_fmr	= mlx4_ib_fmr_dealloc;
+	if (dev->caps.flags & MLX4_DEV_CAP_FLAG_XRC) {
+		ibdev->ib_dev.create_xrc_srq = mlx4_ib_create_xrc_srq;
+		ibdev->ib_dev.alloc_xrcd = mlx4_ib_alloc_xrcd;
+		ibdev->ib_dev.dealloc_xrcd = mlx4_ib_dealloc_xrcd;
+		ibdev->ib_dev.uverbs_cmd_mask |=
+			(1ull << IB_USER_VERBS_CMD_CREATE_XRC_SRQ)	|
+			(1ull << IB_USER_VERBS_CMD_OPEN_XRC_DOMAIN)	|
+			(1ull << IB_USER_VERBS_CMD_CLOSE_XRC_DOMAIN);
+	}
+
 
 	if (ibdev->dev->caps.flags & MLX4_DEV_CAP_FLAG_IPOIB_CSUM)
 		ibdev->ib_dev.flags |= IB_DEVICE_IP_CSUM;
Index: ofed_kernel/drivers/infiniband/hw/mlx4/mlx4_ib.h
===================================================================
--- ofed_kernel.orig/drivers/infiniband/hw/mlx4/mlx4_ib.h	2007-09-18 12:14:40.233722000 +0200
+++ ofed_kernel/drivers/infiniband/hw/mlx4/mlx4_ib.h	2007-09-18 12:15:27.931990000 +0200
@@ -73,6 +73,11 @@ struct mlx4_ib_pd {
 	u32			pdn;
 };
 
+struct mlx4_ib_xrcd {
+	struct ib_xrcd	ibxrcd;
+	u32		xrcdn;
+};
+
 struct mlx4_ib_cq_buf {
 	struct mlx4_buf		buf;
 	struct mlx4_mtt		mtt;
@@ -127,6 +132,7 @@ struct mlx4_ib_qp {
 	struct mlx4_mtt		mtt;
 	int			buf_size;
 	struct mutex		mutex;
+	u16			xrcdn;
 	u8			port;
 	u8			alt_port;
 	u8			atomic_rd_en;
@@ -189,6 +195,11 @@ static inline struct mlx4_ib_pd *to_mpd(
 	return container_of(ibpd, struct mlx4_ib_pd, ibpd);
 }
 
+static inline struct mlx4_ib_xrcd *to_mxrcd(struct ib_xrcd *ibxrcd)
+{
+	return container_of(ibxrcd, struct mlx4_ib_xrcd, ibxrcd);
+}
+
 static inline struct mlx4_ib_cq *to_mcq(struct ib_cq *ibcq)
 {
 	return container_of(ibcq, struct mlx4_ib_cq, ibcq);
@@ -264,6 +275,11 @@ int mlx4_ib_destroy_ah(struct ib_ah *ah)
 struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
 				  struct ib_srq_init_attr *init_attr,
 				  struct ib_udata *udata);
+struct ib_srq *mlx4_ib_create_xrc_srq(struct ib_pd *pd,
+				      struct ib_cq *xrc_cq,
+				      struct ib_xrcd *xrcd,
+				      struct ib_srq_init_attr *init_attr,
+				      struct ib_udata *udata);
 int mlx4_ib_modify_srq(struct ib_srq *ibsrq, struct ib_srq_attr *attr,
 		       enum ib_srq_attr_mask attr_mask, struct ib_udata *udata);
 int mlx4_ib_query_srq(struct ib_srq *srq, struct ib_srq_attr *srq_attr);
Index: ofed_kernel/drivers/net/mlx4/xrcd.c
===================================================================
--- /dev/null	1970-01-01 00:00:00.000000000 +0000
+++ ofed_kernel/drivers/net/mlx4/xrcd.c	2007-09-18 12:15:27.936991000 +0200
@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2006, 2007 Cisco Systems, Inc.  All rights reserved.
+ * Copyright (c) 2007 Mellanox Technologies. 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 <linux/init.h>
+#include <linux/errno.h>
+
+#include "mlx4.h"
+
+int mlx4_xrcd_alloc(struct mlx4_dev *dev, u32 *xrcdn)
+{
+	struct mlx4_priv *priv = mlx4_priv(dev);
+
+	*xrcdn = mlx4_bitmap_alloc(&priv->xrcd_bitmap);
+	if (*xrcdn == -1)
+		return -ENOMEM;
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(mlx4_xrcd_alloc);
+
+void mlx4_xrcd_free(struct mlx4_dev *dev, u32 xrcdn)
+{
+	mlx4_bitmap_free(&mlx4_priv(dev)->xrcd_bitmap, xrcdn);
+}
+EXPORT_SYMBOL_GPL(mlx4_xrcd_free);
+
+int __devinit mlx4_init_xrcd_table(struct mlx4_dev *dev)
+{
+	struct mlx4_priv *priv = mlx4_priv(dev);
+
+	return mlx4_bitmap_init(&priv->xrcd_bitmap, (1 << 16),
+				(1 << 16) - 1, dev->caps.reserved_xrcds + 1);
+}
+
+void mlx4_cleanup_xrcd_table(struct mlx4_dev *dev)
+{
+	mlx4_bitmap_cleanup(&mlx4_priv(dev)->xrcd_bitmap);
+}
+
+
Index: ofed_kernel/drivers/net/mlx4/mlx4.h
===================================================================
--- ofed_kernel.orig/drivers/net/mlx4/mlx4.h	2007-09-18 12:14:40.244721000 +0200
+++ ofed_kernel/drivers/net/mlx4/mlx4.h	2007-09-18 12:15:27.939990000 +0200
@@ -260,6 +260,7 @@ struct mlx4_priv {
 	struct mlx4_cmd		cmd;
 
 	struct mlx4_bitmap	pd_bitmap;
+	struct mlx4_bitmap	xrcd_bitmap;
 	struct mlx4_uar_table	uar_table;
 	struct mlx4_mr_table	mr_table;
 	struct mlx4_cq_table	cq_table;
@@ -289,6 +290,7 @@ void mlx4_bitmap_cleanup(struct mlx4_bit
 int mlx4_reset(struct mlx4_dev *dev);
 
 int mlx4_init_pd_table(struct mlx4_dev *dev);
+int mlx4_init_xrcd_table(struct mlx4_dev *dev);
 int mlx4_init_uar_table(struct mlx4_dev *dev);
 int mlx4_init_mr_table(struct mlx4_dev *dev);
 int mlx4_init_eq_table(struct mlx4_dev *dev);
@@ -305,6 +307,7 @@ void mlx4_cleanup_cq_table(struct mlx4_d
 void mlx4_cleanup_qp_table(struct mlx4_dev *dev);
 void mlx4_cleanup_srq_table(struct mlx4_dev *dev);
 void mlx4_cleanup_mcg_table(struct mlx4_dev *dev);
+void mlx4_cleanup_xrcd_table(struct mlx4_dev *dev);
 
 void mlx4_start_catas_poll(struct mlx4_dev *dev);
 void mlx4_stop_catas_poll(struct mlx4_dev *dev);
Index: ofed_kernel/drivers/net/mlx4/main.c
===================================================================
--- ofed_kernel.orig/drivers/net/mlx4/main.c	2007-09-18 12:14:40.247718000 +0200
+++ ofed_kernel/drivers/net/mlx4/main.c	2007-09-18 12:15:27.945990000 +0200
@@ -160,6 +160,10 @@ static int __devinit mlx4_dev_cap(struct
 	dev->caps.flags		     = dev_cap->flags;
 	dev->caps.stat_rate_support  = dev_cap->stat_rate_support;
 	dev->caps.max_gso_sz	     = dev_cap->max_gso_sz;
+	dev->caps.reserved_xrcds     = (dev->caps.flags & MLX4_DEV_CAP_FLAG_XRC) ?
+		dev_cap->reserved_xrcds : 0;
+	dev->caps.max_xrcds	     = (dev->caps.flags & MLX4_DEV_CAP_FLAG_XRC) ?
+		dev_cap->max_xrcds : 0;
 
 	return 0;
 }
@@ -589,11 +593,18 @@ static int __devinit mlx4_setup_hca(stru
 		goto err_kar_unmap;
 	}
 
+	err = mlx4_init_xrcd_table(dev);
+	if (err) {
+		mlx4_err(dev, "Failed to initialize "
+			 "extended reliably connected domain table, aborting.\n");
+		goto err_pd_table_free;
+	}
+
 	err = mlx4_init_mr_table(dev);
 	if (err) {
 		mlx4_err(dev, "Failed to initialize "
 			 "memory region table, aborting.\n");
-		goto err_pd_table_free;
+		goto err_xrcd_table_free;
 	}
 
 	err = mlx4_init_eq_table(dev);
@@ -670,6 +681,9 @@ err_eq_table_free:
 err_mr_table_free:
 	mlx4_cleanup_mr_table(dev);
 
+err_xrcd_table_free:
+	mlx4_cleanup_xrcd_table(dev);
+
 err_pd_table_free:
 	mlx4_cleanup_pd_table(dev);
 
@@ -851,6 +865,7 @@ err_cleanup:
 	mlx4_cmd_use_polling(dev);
 	mlx4_cleanup_eq_table(dev);
 	mlx4_cleanup_mr_table(dev);
+	mlx4_cleanup_xrcd_table(dev);
 	mlx4_cleanup_pd_table(dev);
 	mlx4_cleanup_uar_table(dev);
 
@@ -897,6 +912,7 @@ static void __devexit mlx4_remove_one(st
 		mlx4_cmd_use_polling(dev);
 		mlx4_cleanup_eq_table(dev);
 		mlx4_cleanup_mr_table(dev);
+		mlx4_cleanup_xrcd_table(dev);
 		mlx4_cleanup_pd_table(dev);
 
 		iounmap(priv->kar);
Index: ofed_kernel/drivers/net/mlx4/srq.c
===================================================================
--- ofed_kernel.orig/drivers/net/mlx4/srq.c	2007-09-18 12:14:40.249721000 +0200
+++ ofed_kernel/drivers/net/mlx4/srq.c	2007-09-18 12:15:27.949990000 +0200
@@ -40,20 +40,20 @@
 struct mlx4_srq_context {
 	__be32			state_logsize_srqn;
 	u8			logstride;
-	u8			reserved1[3];
-	u8			pg_offset;
-	u8			reserved2[3];
-	u32			reserved3;
+	u8			reserved1;
+	__be16			xrc_domain;
+	__be32			pg_offset_cqn;
+	u32			reserved2;
 	u8			log_page_size;
-	u8			reserved4[2];
+	u8			reserved3[2];
 	u8			mtt_base_addr_h;
 	__be32			mtt_base_addr_l;
 	__be32			pd;
 	__be16			limit_watermark;
 	__be16			wqe_cnt;
-	u16			reserved5;
+	u16			reserved4;
 	__be16			wqe_counter;
-	u32			reserved6;
+	u32			reserved5;
 	__be64			db_rec_addr;
 };
 
@@ -109,8 +109,8 @@ static int mlx4_QUERY_SRQ(struct mlx4_de
 			    MLX4_CMD_TIME_CLASS_A);
 }
 
-int mlx4_srq_alloc(struct mlx4_dev *dev, u32 pdn, struct mlx4_mtt *mtt,
-		   u64 db_rec, struct mlx4_srq *srq)
+int mlx4_srq_alloc(struct mlx4_dev *dev, u32 pdn, u32 cqn, u16 xrcd,
+		   struct mlx4_mtt *mtt, u64 db_rec, struct mlx4_srq *srq)
 {
 	struct mlx4_srq_table *srq_table = &mlx4_priv(dev)->srq_table;
 	struct mlx4_cmd_mailbox *mailbox;
@@ -148,6 +148,8 @@ int mlx4_srq_alloc(struct mlx4_dev *dev,
 	srq_context->state_logsize_srqn = cpu_to_be32((ilog2(srq->max) << 24) |
 						      srq->srqn);
 	srq_context->logstride          = srq->wqe_shift - 4;
+	srq_context->xrc_domain		= cpu_to_be16(xrcd);
+	srq_context->pg_offset_cqn	= cpu_to_be32(cqn & 0xffffff);
 	srq_context->log_page_size      = mtt->page_shift - MLX4_ICM_PAGE_SHIFT;
 
 	mtt_addr = mlx4_mtt_addr(dev, mtt);
Index: ofed_kernel/drivers/net/mlx4/fw.c
===================================================================
--- ofed_kernel.orig/drivers/net/mlx4/fw.c	2007-09-18 12:14:40.252717000 +0200
+++ ofed_kernel/drivers/net/mlx4/fw.c	2007-09-18 12:15:27.954992000 +0200
@@ -160,6 +160,8 @@ int mlx4_QUERY_DEV_CAP(struct mlx4_dev *
 #define QUERY_DEV_CAP_MAX_MCG_OFFSET		0x63
 #define QUERY_DEV_CAP_RSVD_PD_OFFSET		0x64
 #define QUERY_DEV_CAP_MAX_PD_OFFSET		0x65
+#define QUERY_DEV_CAP_RSVD_XRC_OFFSET		0x66
+#define QUERY_DEV_CAP_MAX_XRC_OFFSET		0x67
 #define QUERY_DEV_CAP_RDMARC_ENTRY_SZ_OFFSET	0x80
 #define QUERY_DEV_CAP_QPC_ENTRY_SZ_OFFSET	0x82
 #define QUERY_DEV_CAP_AUX_ENTRY_SZ_OFFSET	0x84
@@ -270,6 +272,11 @@ int mlx4_QUERY_DEV_CAP(struct mlx4_dev *
 	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_PD_OFFSET);
 	dev_cap->max_pds = 1 << (field & 0x3f);
 
+	MLX4_GET(field, outbox, QUERY_DEV_CAP_RSVD_XRC_OFFSET);
+	dev_cap->reserved_xrcds = field >> 4;
+	MLX4_GET(field, outbox, QUERY_DEV_CAP_MAX_XRC_OFFSET);
+	dev_cap->max_xrcds = 1 << (field & 0x1f);
+
 	MLX4_GET(size, outbox, QUERY_DEV_CAP_RDMARC_ENTRY_SZ_OFFSET);
 	dev_cap->rdmarc_entry_sz = size;
 	MLX4_GET(size, outbox, QUERY_DEV_CAP_QPC_ENTRY_SZ_OFFSET);
Index: ofed_kernel/drivers/net/mlx4/fw.h
===================================================================
--- ofed_kernel.orig/drivers/net/mlx4/fw.h	2007-09-18 12:14:40.254721000 +0200
+++ ofed_kernel/drivers/net/mlx4/fw.h	2007-09-18 12:15:27.958990000 +0200
@@ -82,6 +82,8 @@ struct mlx4_dev_cap {
 	int max_mcgs;
 	int reserved_pds;
 	int max_pds;
+	int reserved_xrcds;
+	int max_xrcds;
 	int qpc_entry_sz;
 	int rdmarc_entry_sz;
 	int altc_entry_sz;
Index: ofed_kernel/drivers/infiniband/hw/mlx4/qp.c
===================================================================
--- ofed_kernel.orig/drivers/infiniband/hw/mlx4/qp.c	2007-09-18 12:14:40.236718000 +0200
+++ ofed_kernel/drivers/infiniband/hw/mlx4/qp.c	2007-09-18 12:18:47.788826000 +0200
@@ -410,6 +410,9 @@ static int create_qp_common(struct mlx4_
 	if (err)
 		goto err_wrid;
 
+	if (init_attr->qp_type == IB_QPT_XRC)
+		qp->mqp.qpn |= (1 << 23);
+
 	/*
 	 * Hardware wants QPN written in big-endian order (after
 	 * shifting) for send doorbell.  Precompute this value to save
@@ -547,6 +550,9 @@ struct ib_qp *mlx4_ib_create_qp(struct i
 	int err;
 
 	switch (init_attr->qp_type) {
+	case IB_QPT_XRC:
+		if (!(dev->dev->caps.flags & MLX4_DEV_CAP_FLAG_XRC))
+			return ERR_PTR(-ENOSYS);
 	case IB_QPT_RC:
 	case IB_QPT_UC:
 	case IB_QPT_UD:
@@ -561,6 +567,11 @@ struct ib_qp *mlx4_ib_create_qp(struct i
 			return ERR_PTR(err);
 		}
 
+		if (init_attr->qp_type == IB_QPT_XRC)
+			qp->xrcdn = to_mxrcd(init_attr->xrc_domain)->xrcdn;
+		else
+			qp->xrcdn = 0;
+
 		qp->ibqp.qp_num = qp->mqp.qpn;
 
 		break;
@@ -625,6 +636,7 @@ static int to_mlx4_st(enum ib_qp_type ty
 	case IB_QPT_RC:		return MLX4_QP_ST_RC;
 	case IB_QPT_UC:		return MLX4_QP_ST_UC;
 	case IB_QPT_UD:		return MLX4_QP_ST_UD;
+	case IB_QPT_XRC:	return MLX4_QP_ST_XRC;
 	case IB_QPT_SMI:
 	case IB_QPT_GSI:	return MLX4_QP_ST_MLX;
 	default:		return -1;
@@ -772,8 +784,11 @@ static int __mlx4_ib_modify_qp(struct ib
 		context->sq_size_stride = ilog2(qp->sq.wqe_cnt) << 3;
 	context->sq_size_stride |= qp->sq.wqe_shift - 4;
 
-	if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT)
+	if (cur_state == IB_QPS_RESET && new_state == IB_QPS_INIT) {
 		context->sq_size_stride |= !!qp->sq_no_prefetch << 7;
+		if (ibqp->qp_type == IB_QPT_XRC)
+			context->xrcd = cpu_to_be32((u32) qp->xrcdn);
+	}
 
 	if (qp->ibqp.uobject)
 		context->usr_page = cpu_to_be32(to_mucontext(ibqp->uobject->context)->uar.index);
Index: ofed_kernel/drivers/infiniband/hw/mlx4/srq.c
===================================================================
--- ofed_kernel.orig/drivers/infiniband/hw/mlx4/srq.c	2007-09-18 12:14:40.240718000 +0200
+++ ofed_kernel/drivers/infiniband/hw/mlx4/srq.c	2007-09-18 12:15:27.970990000 +0200
@@ -72,13 +72,17 @@ static void mlx4_ib_srq_event(struct mlx
 	}
 }
 
-struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
-				  struct ib_srq_init_attr *init_attr,
-				  struct ib_udata *udata)
+struct ib_srq *mlx4_ib_create_xrc_srq(struct ib_pd *pd,
+				      struct ib_cq *xrc_cq,
+				      struct ib_xrcd *xrcd,
+				      struct ib_srq_init_attr *init_attr,
+				      struct ib_udata *udata)
 {
 	struct mlx4_ib_dev *dev = to_mdev(pd->device);
 	struct mlx4_ib_srq *srq;
 	struct mlx4_wqe_srq_next_seg *next;
+	u32	cqn;
+	u16	xrcdn;
 	int desc_size;
 	int buf_size;
 	int err;
@@ -172,7 +176,11 @@ struct ib_srq *mlx4_ib_create_srq(struct
 		}
 	}
 
-	err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, &srq->mtt,
+	cqn = xrc_cq ? (u32) (to_mcq(xrc_cq)->mcq.cqn) : 0;
+	xrcdn = xrcd ? (u16) (to_mxrcd(xrcd)->xrcdn) :
+		(u16) dev->dev->caps.reserved_xrcds;
+
+	err = mlx4_srq_alloc(dev->dev, to_mpd(pd)->pdn, cqn, xrcdn, &srq->mtt,
 			     srq->db.dma, &srq->msrq);
 	if (err)
 		goto err_wrid;
@@ -240,6 +248,13 @@ int mlx4_ib_modify_srq(struct ib_srq *ib
 	return 0;
 }
 
+struct ib_srq *mlx4_ib_create_srq(struct ib_pd *pd,
+				  struct ib_srq_init_attr *init_attr,
+				  struct ib_udata *udata)
+{
+	return mlx4_ib_create_xrc_srq(pd, NULL, NULL, init_attr, udata);
+}
+
 int mlx4_ib_query_srq(struct ib_srq *ibsrq, struct ib_srq_attr *srq_attr)
 {
 	struct mlx4_ib_dev *dev = to_mdev(ibsrq->device);
Index: ofed_kernel/include/linux/mlx4/qp.h
===================================================================
--- ofed_kernel.orig/include/linux/mlx4/qp.h	2007-09-18 12:14:40.227721000 +0200
+++ ofed_kernel/include/linux/mlx4/qp.h	2007-09-18 12:15:27.973990000 +0200
@@ -74,6 +74,7 @@ enum {
 	MLX4_QP_ST_UC				= 0x1,
 	MLX4_QP_ST_RD				= 0x2,
 	MLX4_QP_ST_UD				= 0x3,
+	MLX4_QP_ST_XRC				= 0x6,
 	MLX4_QP_ST_MLX				= 0x7
 };
 
@@ -136,7 +137,7 @@ struct mlx4_qp_context {
 	__be32			ssn;
 	__be32			params2;
 	__be32			rnr_nextrecvpsn;
-	__be32			srcd;
+	__be32			xrcd;
 	__be32			cqn_recv;
 	__be64			db_rec_addr;
 	__be32			qkey;
Index: ofed_kernel/drivers/net/mlx4/Makefile
===================================================================
--- ofed_kernel.orig/drivers/net/mlx4/Makefile	2007-09-18 12:14:40.257717000 +0200
+++ ofed_kernel/drivers/net/mlx4/Makefile	2007-09-18 12:15:27.976991000 +0200
@@ -1,4 +1,4 @@
 obj-$(CONFIG_MLX4_CORE)		+= mlx4_core.o
 
 mlx4_core-y :=	alloc.o catas.o cmd.o cq.o eq.o fw.o icm.o intf.o main.o mcg.o \
-		mr.o pd.o profile.o qp.o reset.o srq.o
+		mr.o pd.o profile.o qp.o reset.o srq.o xrcd.o
Index: ofed_kernel/drivers/net/mlx4/qp.c
===================================================================
--- ofed_kernel.orig/drivers/net/mlx4/qp.c	2007-09-18 12:14:40.000000000 +0200
+++ ofed_kernel/drivers/net/mlx4/qp.c	2007-09-18 12:20:43.390650000 +0200
@@ -263,10 +263,12 @@ int __devinit mlx4_init_qp_table(struct 
 	 * We reserve 2 extra QPs per port for the special QPs.  The
 	 * block of special QPs must be aligned to a multiple of 8, so
 	 * round up.
+	 * We also reserve the MSB of the 24-bit QP number to indicate
+	 * an XRC qp.
 	 */
 	dev->caps.sqp_start = ALIGN(dev->caps.reserved_qps, 8);
 	err = mlx4_bitmap_init(&qp_table->bitmap, dev->caps.num_qps,
-			       (1 << 24) - 1, dev->caps.sqp_start + 8);
+			       (1 << 23) - 1, dev->caps.sqp_start + 8);
 	if (err)
 		return err;
 


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