[openib-general] [PATCH v1/RFC] IB: Add SCSI RDMA Protocol (SRP) initiator

Troy Benjegerdes hozer at hozed.org
Tue Sep 13 14:42:27 PDT 2005


Is there anyplace I can find an SRP target for Linux? What is available?
(Ideally, I'd like one for 2.6.1[3,4] )

On Tue, Sep 13, 2005 at 11:14:55AM -0700, Roland Dreier wrote:
> Sorry to interrupt the SAS arguments, but...
> 
> Here's the latest version of the InfiniBand SRP initiator.  I think
> it's ready for merging; I implemented error handling, which was the
> main thing pointed out from the generally positive reviews of my
> previous posting.  I've done a decent amount of testing without seeing
> any problems, and John Kingman has also tested against his SRP target.
> 
> Since this is a completely new driver and can't break anything,
> assuming the code looks good, does it seem OK to merge for 2.6.14?
> 
> Thanks,
>   Roland
> 
> 
> Add an InfiniBand SCSI RDMA Protocol (SRP) initiator.  This lets us
> talk to InfiniBand SRP targets (storage devices).
> 
> Signed-off-by: Roland Dreier <rolandd at cisco.com>
> 
> ---
> 
>  drivers/infiniband/Kconfig          |    2 
>  drivers/infiniband/Makefile         |    1 
>  drivers/infiniband/ulp/srp/Kbuild   |    3 
>  drivers/infiniband/ulp/srp/Kconfig  |   11 
>  drivers/infiniband/ulp/srp/ib_srp.c | 1637 +++++++++++++++++++++++++++++++++++
>  drivers/infiniband/ulp/srp/ib_srp.h |  324 +++++++
>  6 files changed, 1978 insertions(+), 0 deletions(-)
> 
> 891de9c3d67dc4afc2e5c941bba96613bca81ae1
> diff --git a/drivers/infiniband/Kconfig b/drivers/infiniband/Kconfig
> --- a/drivers/infiniband/Kconfig
> +++ b/drivers/infiniband/Kconfig
> @@ -33,4 +33,6 @@ source "drivers/infiniband/hw/mthca/Kcon
>  
>  source "drivers/infiniband/ulp/ipoib/Kconfig"
>  
> +source "drivers/infiniband/ulp/srp/Kconfig"
> +
>  endmenu
> diff --git a/drivers/infiniband/Makefile b/drivers/infiniband/Makefile
> --- a/drivers/infiniband/Makefile
> +++ b/drivers/infiniband/Makefile
> @@ -1,3 +1,4 @@
>  obj-$(CONFIG_INFINIBAND)		+= core/
>  obj-$(CONFIG_INFINIBAND_MTHCA)		+= hw/mthca/
>  obj-$(CONFIG_INFINIBAND_IPOIB)		+= ulp/ipoib/
> +obj-$(CONFIG_INFINIBAND_SRP)		+= ulp/srp/
> diff --git a/drivers/infiniband/ulp/srp/Kbuild b/drivers/infiniband/ulp/srp/Kbuild
> new file mode 100644
> --- /dev/null
> +++ b/drivers/infiniband/ulp/srp/Kbuild
> @@ -0,0 +1,3 @@
> +EXTRA_CFLAGS += -Idrivers/infiniband/include
> +
> +obj-$(CONFIG_INFINIBAND_SRP)			+= ib_srp.o
> diff --git a/drivers/infiniband/ulp/srp/Kconfig b/drivers/infiniband/ulp/srp/Kconfig
> new file mode 100644
> --- /dev/null
> +++ b/drivers/infiniband/ulp/srp/Kconfig
> @@ -0,0 +1,11 @@
> +config INFINIBAND_SRP
> +	tristate "InfiniBand SCSI RDMA Protocol"
> +	depends on INFINIBAND && SCSI
> +	---help---
> +	  Support for the SCSI RDMA Protocol over InfiniBand.  This
> +	  allows you to access storage devices that speak SRP over
> +	  InfiniBand.
> +
> +	  The SRP protocol is defined by the INCITS T10 technical
> +	  committee.  See <http://www.t10.org/>.
> +
> diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
> new file mode 100644
> --- /dev/null
> +++ b/drivers/infiniband/ulp/srp/ib_srp.c
> @@ -0,0 +1,1637 @@
> +/*
> + * Copyright (c) 2005 Cisco Systems.  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.
> + *
> + * $Id: ib_srp.c 3395 2005-09-13 05:10:39Z roland $
> + */
> +
> +#include <linux/version.h>
> +#include <linux/module.h>
> +#include <linux/init.h>
> +#include <linux/slab.h>
> +#include <linux/err.h>
> +#include <linux/string.h>
> +#include <linux/parser.h>
> +
> +#include <asm/atomic.h>
> +
> +#include <scsi/scsi.h>
> +#include <scsi/scsi_device.h>
> +#include <scsi/scsi_dbg.h>
> +
> +#include <rdma/ib_cache.h>
> +
> +#include "ib_srp.h"
> +
> +#define DRV_NAME	"ib_srp"
> +#define PFX		DRV_NAME ": "
> +#define DRV_VERSION	"0.01"
> +#define DRV_RELDATE	"January 11, 2005"
> +
> +MODULE_AUTHOR("Roland Dreier");
> +MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol driver");
> +MODULE_LICENSE("Dual BSD/GPL");
> +
> +static int topspin_workarounds = 1;
> +
> +module_param(topspin_workarounds, int, 0444);
> +MODULE_PARM_DESC(topspin_workarounds,
> +		 "Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
> +
> +static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
> +
> +static void srp_add_one(struct ib_device *device);
> +static void srp_remove_one(struct ib_device *device);
> +static void srp_completion(struct ib_cq *cq, void *target_ptr);
> +static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
> +
> +static struct ib_client srp_client = {
> +	.name   = "srp",
> +	.add    = srp_add_one,
> +	.remove = srp_remove_one
> +};
> +
> +static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
> +{
> +	return (struct srp_target_port *) host->hostdata;
> +}
> +
> +static const char *srp_target_info(struct Scsi_Host *host)
> +{
> +	return host_to_target(host)->target_name;
> +}
> +
> +static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
> +				   unsigned int __nocast gfp_mask,
> +				   enum dma_data_direction direction)
> +{
> +	struct srp_iu *iu;
> +
> +	iu = kmalloc(sizeof *iu, gfp_mask);
> +	if (!iu)
> +		goto out;
> +
> +	iu->buf = kzalloc(size, gfp_mask);
> +	if (!iu->buf)
> +		goto out_free_iu;
> +
> +	iu->dma = dma_map_single(host->dev->dma_device, iu->buf, size, direction);
> +	if (dma_mapping_error(iu->dma))
> +		goto out_free_buf;
> +
> +	iu->size      = size;
> +	iu->direction = direction;
> +
> +	return iu;
> +
> +out_free_buf:
> +	kfree(iu->buf);
> +out_free_iu:
> +	kfree(iu);
> +out:
> +	return NULL;
> +}
> +
> +static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
> +{
> +	if (!iu)
> +		return;
> +
> +	dma_unmap_single(host->dev->dma_device, iu->dma, iu->size, iu->direction);
> +	kfree(iu->buf);
> +	kfree(iu);
> +}
> +
> +static void srp_qp_event(struct ib_event *event, void *context)
> +{
> +	printk(KERN_ERR PFX "QP event %d\n", event->event);
> +}
> +
> +static int srp_init_qp(struct srp_target_port *target,
> +		       struct ib_qp *qp)
> +{
> +	struct ib_qp_attr *attr;
> +	int ret;
> +
> +	attr = kmalloc(sizeof *attr, GFP_KERNEL);
> +	if (!attr)
> +		return -ENOMEM;
> +
> +	ret = ib_find_cached_pkey(target->srp_host->dev,
> +				  target->srp_host->port,
> +				  be16_to_cpu(target->path.pkey),
> +				  &attr->pkey_index);
> +	if (ret)
> +		return ret;
> +
> +	attr->qp_state        = IB_QPS_INIT;
> +	attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
> +				    IB_ACCESS_REMOTE_WRITE);
> +	attr->port_num        = target->srp_host->port;
> +
> +	return ib_modify_qp(qp, attr,
> +			    IB_QP_STATE		|
> +			    IB_QP_PKEY_INDEX	|
> +			    IB_QP_ACCESS_FLAGS	|
> +			    IB_QP_PORT);
> +}
> +
> +static struct ib_qp *srp_create_qp(struct srp_target_port *target,
> +				   struct ib_qp_init_attr *init_attr)
> +{
> +	struct ib_qp *qp;
> +	int ret;
> +
> +	qp = ib_create_qp(target->srp_host->pd, init_attr);
> +	if (IS_ERR(qp))
> +		return qp;
> +
> +	ret = srp_init_qp(target, qp);
> +	if (ret) {
> +		ib_destroy_qp(qp);
> +		qp = ERR_PTR(ret);
> +	}
> +
> +	return qp;
> +}
> +
> +static void srp_path_rec_completion(int status,
> +				    struct ib_sa_path_rec *pathrec,
> +				    void *target_ptr)
> +{
> +	struct srp_target_port *target = target_ptr;
> +	struct srp_host        *host   = target->srp_host;
> +	struct ib_qp_init_attr *init_attr = NULL;
> +
> +	if (status) {
> +		printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
> +		target->status = status;
> +		goto out;
> +	}
> +
> +	target->path = *pathrec;
> +
> +	/*
> +	 * We may be getting a path for the second time because we
> +	 * were redirected to a different port.  In that case, there's
> +	 * no reason to create our CQ and QP again.
> +	 */
> +	if (target->cq) {
> +		target->status = 0;
> +		goto out;
> +	}
> +
> +	init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
> +	if (!init_attr) {
> +		target->status = -ENOMEM;
> +		goto out;
> +	}
> +
> +	target->cq = ib_create_cq(host->dev, srp_completion,
> +				  NULL, target, SRP_CQ_SIZE);
> +	if (IS_ERR(target->cq)) {
> +		target->status = PTR_ERR(target->cq);
> +		goto out_free;
> +	}
> +
> +	ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
> +
> +	init_attr->event_handler       = srp_qp_event;
> +	init_attr->cap.max_send_wr     = SRP_SQ_SIZE;
> +	init_attr->cap.max_recv_wr     = SRP_RQ_SIZE;
> +	init_attr->cap.max_recv_sge    = 1;
> +	init_attr->cap.max_send_sge    = 1;
> +	init_attr->sq_sig_type         = IB_SIGNAL_ALL_WR;
> +	init_attr->qp_type             = IB_QPT_RC;
> +	init_attr->send_cq             = target->cq;
> +	init_attr->recv_cq             = target->cq;
> +
> +	target->qp = srp_create_qp(target, init_attr);
> +	if (IS_ERR(target->qp)) {
> +		target->status = PTR_ERR(target->qp);
> +		ib_destroy_cq(target->cq);
> +		goto out_free;
> +	}
> +
> +	target->status = 0;
> +
> +out_free:
> +	kfree(init_attr);
> +
> +out:
> +	complete(&target->done);
> +}
> +
> +static int srp_lookup_path(struct srp_target_port *target)
> +{
> +	target->path.numb_path = 1;
> +
> +	init_completion(&target->done);
> +
> +	target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev,
> +						   target->srp_host->port,
> +						   &target->path,
> +						   IB_SA_PATH_REC_DGID		|
> +						   IB_SA_PATH_REC_SGID		|
> +						   IB_SA_PATH_REC_NUMB_PATH	|
> +						   IB_SA_PATH_REC_PKEY,
> +						   SRP_PATH_REC_TIMEOUT_MS,
> +						   GFP_KERNEL,
> +						   srp_path_rec_completion,
> +						   target, &target->path_query);
> +	if (target->path_query_id < 0)
> +		return target->path_query_id;
> +
> +	wait_for_completion(&target->done);
> +
> +	if (target->status < 0)
> +		printk(KERN_WARNING PFX "Path record query failed\n");
> +
> +	return target->status;
> +}
> +
> +static int srp_send_req(struct srp_target_port *target)
> +{
> +	struct {
> +		struct ib_cm_req_param param;
> +		struct srp_login_req   priv;
> +	} *req = NULL;
> +	int status;
> +
> +	req = kzalloc(sizeof *req, GFP_KERNEL);
> +	if (!req)
> +		return -ENOMEM;
> +
> +	req->param.primary_path 	      = &target->path;
> +	req->param.alternate_path 	      = NULL;
> +	req->param.service_id 		      = target->service_id;
> +	req->param.qp_num 		      = target->qp->qp_num;
> +	req->param.qp_type 		      = target->qp->qp_type;
> +	req->param.starting_psn 	      = 0; /* XXX */
> +	req->param.private_data 	      = &req->priv;
> +	req->param.private_data_len 	      = sizeof req->priv;
> +	req->param.responder_resources	      = 4;
> +	req->param.remote_cm_response_timeout = 20;
> +	req->param.flow_control 	      = 1;
> +	req->param.local_cm_response_timeout  = 20;
> +	req->param.retry_count 		      = 7;
> +	req->param.rnr_retry_count 	      = 7;
> +	req->param.max_cm_retries 	      = 15;
> +
> +	req->priv.opcode     	= SRP_LOGIN_REQ;
> +	req->priv.tag        	= 0;
> +	req->priv.req_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
> +	req->priv.req_buf_fmt 	= cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
> +					      SRP_BUF_FORMAT_INDIRECT);
> +	memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
> +	/*
> +	 * Topspin/Cisco SRP targets will reject our login unless we
> +	 * zero out the first 8 bytes of our initiator port ID.  The
> +	 * second 8 bytes must be our local node GUID, but we always
> +	 * use that anyway.
> +	 */
> +	if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
> +		printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
> +		       "activated for target GUID %016llx\n",
> +		       (unsigned long long) be64_to_cpu(target->ioc_guid));
> +		memset(req->priv.initiator_port_id, 0, 8);
> +	}
> +	memcpy(req->priv.target_port_id,     &target->id_ext, 8);
> +	memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
> +
> +	status = ib_send_cm_req(target->cm_id, &req->param);
> +	if (status) {
> +		ib_destroy_qp(target->qp);
> +		ib_destroy_cq(target->cq);
> +	}
> +
> +	return status;
> +}
> +
> +static void srp_disconnect_target(struct srp_target_port *target)
> +{
> +	/* XXX should send SRP_I_LOGOUT request */
> +
> +	init_completion(&target->done);
> +	ib_send_cm_dreq(target->cm_id, NULL, 0);
> +	wait_for_completion(&target->done);
> +}
> +
> +static void srp_free_target_ib(struct srp_target_port *target)
> +{
> +	int i;
> +
> +	ib_destroy_qp(target->qp);
> +	ib_destroy_cq(target->cq);
> +
> +	for (i = 0; i < SRP_RQ_SIZE; ++i)
> +		srp_free_iu(target->srp_host, target->rx_ring[i]);
> +	for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
> +		srp_free_iu(target->srp_host, target->tx_ring[i]);
> +}
> +
> +static void srp_remove_work(void *target_ptr)
> +{
> +	struct srp_target_port *target = target_ptr;
> +
> +	spin_lock_irq(target->scsi_host->host_lock);
> +	if (target->state != SRP_TARGET_DEAD) {
> +		spin_unlock_irq(target->scsi_host->host_lock);
> +		scsi_host_put(target->scsi_host);
> +		return;
> +	}
> +	target->state = SRP_TARGET_REMOVED;
> +	spin_unlock_irq(target->scsi_host->host_lock);
> +
> +	down(&target->srp_host->target_mutex);
> +	list_del(&target->list);
> +	up(&target->srp_host->target_mutex);
> +
> +	scsi_remove_host(target->scsi_host);
> +	ib_destroy_cm_id(target->cm_id);
> +	srp_free_target_ib(target);
> +	scsi_host_put(target->scsi_host);
> +	/* And another put to really free the target port... */
> +	scsi_host_put(target->scsi_host);
> +}
> +
> +static int srp_connect_target(struct srp_target_port *target)
> +{
> +	int ret;
> +
> +	while (1) {
> +		init_completion(&target->done);
> +		ret = srp_send_req(target);
> +		if (ret)
> +			return ret;
> +		wait_for_completion(&target->done);
> +
> +		/*
> +		 * The CM event handling code will set status to
> +		 * SRP_PORT_REDIRECT if we get a port redirect REJ
> +		 * back, or SRP_DLID_REDIRECT if we get a lid/qp
> +		 * redirect REJ back.
> +		 */
> +		switch (target->status) {
> +		case 0:
> +			return 0;
> +
> +		case SRP_PORT_REDIRECT:
> +			ret = srp_lookup_path(target);
> +			if (ret)
> +				return ret;
> +			break;
> +
> +		case SRP_DLID_REDIRECT:
> +			break;
> +
> +		default:
> +			return target->status;
> +		}
> +	}
> +}
> +
> +static int srp_reconnect_target(struct srp_target_port *target)
> +{
> +	struct ib_qp_attr qp_attr;
> +	struct srp_request *req;
> +	struct ib_wc wc;
> +	u32 remote_cm_qpn;
> +	int ret;
> +	int i;
> +
> +	spin_lock_irq(target->scsi_host->host_lock);
> +	if (target->state != SRP_TARGET_LIVE) {
> +		spin_unlock_irq(target->scsi_host->host_lock);
> +		return -EAGAIN;
> +	}
> +	target->state = SRP_TARGET_CONNECTING;
> +	spin_unlock_irq(target->scsi_host->host_lock);
> +
> +	remote_cm_qpn = target->cm_id->remote_cm_qpn;
> +
> +	srp_disconnect_target(target);
> +
> +	target->cm_id = ib_create_cm_id(srp_cm_handler, target);
> +	if (IS_ERR(target->cm_id)) {
> +		ret = PTR_ERR(target->cm_id);
> +		target->cm_id = NULL;
> +		goto err;
> +	}
> +
> +	target->cm_id->remote_cm_qpn = remote_cm_qpn;
> +
> +	qp_attr.qp_state = IB_QPS_RESET;
> +	ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
> +	if (ret)
> +		goto err;
> +
> +	ret = srp_init_qp(target, target->qp);
> +	if (ret)
> +		goto err;
> +
> +	while (ib_poll_cq(target->cq, 1, &wc) > 0)
> +		; /* nothing */
> +
> +	list_for_each_entry(req, &target->req_queue, list) {
> +		req->scmnd->result = DID_RESET << 16;
> +		req->scmnd->scsi_done(req->scmnd);
> +	}
> +
> +	target->rx_head	 = 0;
> +	target->rx_tail	 = 0;
> +	target->tx_head	 = 0;
> +	target->tx_tail  = 0;
> +	target->req_head = 0;
> +	for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
> +		target->req_ring[i].next = i + 1;
> +	target->req_ring[SRP_SQ_SIZE - 1].next = -1;
> +	INIT_LIST_HEAD(&target->req_queue);
> +
> +	ret = srp_connect_target(target);
> +	if (ret)
> +		goto err;
> +
> +	spin_lock_irq(target->scsi_host->host_lock);
> +	if (target->state == SRP_TARGET_CONNECTING) {
> +		ret = 0;
> +		target->state = SRP_TARGET_LIVE;
> +	} else
> +		ret = -EAGAIN;
> +	spin_unlock_irq(target->scsi_host->host_lock);
> +
> +	return ret;
> +
> +err:
> +	printk(KERN_ERR PFX "reconnect failed, removing target port.\n");
> +
> +	/*
> +	 * We couldn't reconnect, so kill our target port off.
> +	 * However, we have to defer the real removal because we might
> +	 * be in the context of the SCSI error handler now, which
> +	 * would deadlock if we call scsi_remove_host().
> +	 */
> +	spin_lock_irq(target->scsi_host->host_lock);
> +	if (target->state == SRP_TARGET_CONNECTING) {
> +		target->state = SRP_TARGET_DEAD;
> +		INIT_WORK(&target->work, srp_remove_work, target);
> +		schedule_work(&target->work);
> +	}
> +	spin_unlock_irq(target->scsi_host->host_lock);
> +
> +	return ret;
> +}
> +
> +static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
> +			struct srp_iu *iu)
> +{
> +	struct srp_cmd *cmd = iu->buf;
> +	int len;
> +	u8 fmt;
> +
> +	if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
> +		return sizeof (struct srp_cmd);
> +
> +	if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
> +	    scmnd->sc_data_direction != DMA_TO_DEVICE) {
> +		printk(KERN_WARNING PFX "Unhandled data direction %d\n",
> +		       scmnd->sc_data_direction);
> +		return -EINVAL;
> +	}
> +
> +	if (scmnd->use_sg) {
> +		struct scatterlist *scat = scmnd->request_buffer;
> +		int n;
> +		int i;
> +
> +		n = dma_map_sg(target->srp_host->dev->dma_device,
> +			       scat, scmnd->use_sg, scmnd->sc_data_direction);
> +
> +		if (n == 1) {
> +			struct srp_direct_buf *buf = (void *) cmd->add_data;
> +
> +			fmt = SRP_DATA_DESC_DIRECT;
> +
> +			buf->va  = cpu_to_be64(sg_dma_address(scat));
> +			buf->key = cpu_to_be32(target->srp_host->mr->rkey);
> +			buf->len = cpu_to_be32(sg_dma_len(scat));
> +
> +			len = sizeof (struct srp_cmd) +
> +				sizeof (struct srp_direct_buf);
> +		} else {
> +			struct srp_indirect_buf *buf = (void *) cmd->add_data;
> +			u32 datalen = 0;
> +
> +			fmt = SRP_DATA_DESC_INDIRECT;
> +
> +			if (scmnd->sc_data_direction == DMA_TO_DEVICE)
> +				cmd->data_out_desc_cnt = n;
> +			else
> +				cmd->data_in_desc_cnt = n;
> +
> +			buf->table_desc.va  = cpu_to_be64(iu->dma +
> +							  sizeof *cmd +
> +							  sizeof *buf);
> +			buf->table_desc.key =
> +				cpu_to_be32(target->srp_host->mr->rkey);
> +			buf->table_desc.len =
> +				cpu_to_be32(n * sizeof (struct srp_direct_buf));
> +
> +			for (i = 0; i < n; ++i) {
> +				buf->desc_list[i].va  = cpu_to_be64(sg_dma_address(&scat[i]));
> +				buf->desc_list[i].key =
> +					cpu_to_be32(target->srp_host->mr->rkey);
> +				buf->desc_list[i].len = cpu_to_be32(sg_dma_len(&scat[i]));
> +
> +				datalen += sg_dma_len(&scat[i]);
> +			}
> +
> +			buf->len = cpu_to_be32(datalen);
> +
> +			len = sizeof (struct srp_cmd) +
> +				sizeof (struct srp_indirect_buf) +
> +				n * sizeof (struct srp_direct_buf);
> +		}
> +	} else {
> +		struct srp_direct_buf *buf = (void *) cmd->add_data;
> +		dma_addr_t dma;
> +
> +		dma = dma_map_single(target->srp_host->dev->dma_device,
> +				     scmnd->request_buffer, scmnd->request_bufflen,
> +				     scmnd->sc_data_direction);
> +		if (dma_mapping_error(dma)) {
> +			printk(KERN_WARNING PFX "unable to map %p/%d (dir %d)\n",
> +			       scmnd->request_buffer, (int) scmnd->request_bufflen,
> +			       scmnd->sc_data_direction);
> +			return -EINVAL;
> +		}
> +
> +		buf->va  = cpu_to_be64(dma);
> +		buf->key = cpu_to_be32(target->srp_host->mr->rkey);
> +		buf->len = cpu_to_be32(scmnd->request_bufflen);
> +
> +		fmt = SRP_DATA_DESC_DIRECT;
> +
> +		len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
> +	}
> +
> +	if (scmnd->sc_data_direction == DMA_TO_DEVICE)
> +		cmd->buf_fmt = fmt << 4;
> +	else
> +		cmd->buf_fmt = fmt;
> +
> +
> +	return len;
> +}
> +
> +static void srp_unmap_data(struct scsi_cmnd *scmnd,
> +			   struct srp_target_port *target,
> +			   struct srp_cmd *cmd)
> +{
> +	if (!scmnd->request_buffer ||
> +	    (scmnd->sc_data_direction != DMA_TO_DEVICE &&
> +	     scmnd->sc_data_direction != DMA_FROM_DEVICE))
> +	    return;
> +
> +	if (scmnd->use_sg)
> +		dma_unmap_sg(target->srp_host->dev->dma_device,
> +			     (struct scatterlist *) scmnd->request_buffer,
> +			     scmnd->use_sg, scmnd->sc_data_direction);
> +	else
> +		dma_unmap_single(target->srp_host->dev->dma_device,
> +				 be64_to_cpu(((struct srp_direct_buf *) cmd->add_data)->va),
> +				 scmnd->request_bufflen,
> +				 scmnd->sc_data_direction);
> +}
> +
> +static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
> +{
> +	struct srp_request *req;
> +	struct scsi_cmnd *scmnd;
> +	struct srp_iu *iu;
> +	unsigned long flags;
> +	s32 delta;
> +
> +	delta = (s32) be32_to_cpu(rsp->req_lim_delta);
> +
> +	spin_lock_irqsave(target->scsi_host->host_lock, flags);
> +
> +	target->req_lim += delta;
> +
> +	req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
> +
> +	if (rsp->tag & SRP_TAG_TSK_MGMT) {
> +		if (be32_to_cpu(rsp->resp_data_len) < 4)
> +			req->tsk_status = -1;
> +		else
> +			req->tsk_status = rsp->data[3];
> +		complete(&req->done);
> +	} else {
> +		iu 	      = req->cmd;
> +		scmnd 	      = req->scmnd;
> +		scmnd->result = rsp->status;
> +
> +		if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
> +			memcpy(scmnd->sense_buffer, rsp->data +
> +			       be32_to_cpu(rsp->resp_data_len),
> +			       min_t(int, be32_to_cpu(rsp->sense_data_len),
> +				     SCSI_SENSE_BUFFERSIZE));
> +		}
> +
> +		if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
> +			scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
> +		else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
> +			scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
> +
> +		srp_unmap_data(scmnd, target, iu->buf);
> +
> +		if (!req->tsk_mgmt) {
> +			req->scmnd = NULL;
> +			scmnd->host_scribble = (void *) -1L;
> +			scmnd->scsi_done(scmnd);
> +
> +			list_del(&req->list);
> +			req->next = target->req_head;
> +			target->req_head = rsp->tag & ~SRP_TAG_TSK_MGMT;
> +		} else
> +			req->cmd_done = 1;
> +	}
> +
> +	spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
> +}
> +
> +static void srp_reconnect_work(void *target_ptr)
> +{
> +	struct srp_target_port *target = target_ptr;
> +
> +	srp_reconnect_target(target);
> +}
> +
> +static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
> +{
> +	struct srp_iu *iu;
> +	u8 opcode;
> +
> +	iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
> +
> +	dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
> +				target->max_ti_iu_len, DMA_FROM_DEVICE);
> +
> +	opcode = *(u8 *) iu->buf;
> +
> +	if (0) {
> +		int i;
> +
> +		printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
> +
> +		for (i = 0; i < wc->byte_len; ++i) {
> +			if (i % 8 == 0)
> +				printk(KERN_ERR "  [%02x] ", i);
> +			printk(" %02x", ((u8 *) iu->buf)[i]);
> +			if ((i + 1) % 8 == 0)
> +				printk("\n");
> +		}
> +
> +		if (wc->byte_len % 8)
> +			printk("\n");
> +	}
> +
> +	switch (opcode) {
> +	case SRP_RSP:
> +		srp_process_rsp(target, iu->buf);
> +		break;
> +
> +	case SRP_T_LOGOUT:
> +		/* XXX Handle target logout */
> +		printk(KERN_WARNING PFX "Got target logout request\n");
> +		break;
> +
> +	default:
> +		printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
> +		break;
> +	}
> +
> +	dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
> +				   target->max_ti_iu_len, DMA_FROM_DEVICE);
> +
> +	++target->rx_tail;
> +}
> +
> +static void srp_completion(struct ib_cq *cq, void *target_ptr)
> +{
> +	struct srp_target_port *target = target_ptr;
> +	struct ib_wc wc;
> +	unsigned long flags;
> +
> +	ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
> +	while (ib_poll_cq(cq, 1, &wc) > 0) {
> +		if (wc.status) {
> +			printk(KERN_ERR PFX "failed %s status %d\n",
> +			       wc.wr_id & SRP_OP_RECV ? "receive" : "send",
> +			       wc.status);
> +			spin_lock_irqsave(target->scsi_host->host_lock, flags);
> +			if (target->state == SRP_TARGET_LIVE)
> +				schedule_work(&target->work);
> +			spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
> +			break;
> +		}
> +
> +		if (wc.wr_id & SRP_OP_RECV)
> +			srp_handle_recv(target, &wc);
> +		else
> +			++target->tx_tail;
> +	}
> +}
> +
> +static int __srp_post_recv(struct srp_target_port *target,
> +			   unsigned int __nocast gfp_mask)
> +{
> +	struct srp_iu *iu;
> +	struct ib_sge list;
> +	struct ib_recv_wr wr, *bad_wr;
> +	unsigned int next;
> +	int ret;
> +
> +	next 	 = target->rx_head & (SRP_RQ_SIZE - 1);
> +	wr.wr_id = next | SRP_OP_RECV;
> +	iu 	 = target->rx_ring[next];
> +
> +	list.addr   = iu->dma;
> +	list.length = iu->size;
> +	list.lkey   = target->srp_host->mr->lkey;
> +
> +	wr.next     = NULL;
> +	wr.sg_list  = &list;
> +	wr.num_sge  = 1;
> +
> +	ret = ib_post_recv(target->qp, &wr, &bad_wr);
> +	if (!ret)
> +		++target->rx_head;
> +
> +	return ret;
> +}
> +
> +static int srp_post_recv(struct srp_target_port *target,
> +			 unsigned int __nocast gfp_mask)
> +{
> +	unsigned long flags;
> +	int ret;
> +
> +	spin_lock_irqsave(target->scsi_host->host_lock, flags);
> +	ret = __srp_post_recv(target, gfp_mask);
> +	spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
> +
> +	return ret;
> +}
> +
> +/*
> + * Must be called with target->scsi_host->host_lock held to protect
> + * req_lim and tx_head.
> + */
> +static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
> +{
> +	if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
> +		return NULL;
> +
> +	return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
> +}
> +
> +/*
> + * Must be called with target->scsi_host->host_lock held to protect
> + * req_lim and tx_head.
> + */
> +static int __srp_post_send(struct srp_target_port *target,
> +			   struct srp_iu *iu, int len)
> +{
> +	struct ib_sge list;
> +	struct ib_send_wr wr, *bad_wr;
> +	int ret = 0;
> +
> +	if (target->req_lim < 1) {
> +		printk(KERN_ERR PFX "Target has req_lim %d\n", target->req_lim);
> +		return -EAGAIN;
> +	}
> +
> +	list.addr   = iu->dma;
> +	list.length = len;
> +	list.lkey   = target->srp_host->mr->lkey;
> +
> +	wr.next       = NULL;
> +	wr.wr_id      = target->tx_head & SRP_SQ_SIZE;
> +	wr.sg_list    = &list;
> +	wr.num_sge    = 1;
> +	wr.opcode     = IB_WR_SEND;
> +	wr.send_flags = IB_SEND_SIGNALED;
> +
> +	ret = ib_post_send(target->qp, &wr, &bad_wr);
> +
> +	if (!ret) {
> +		++target->tx_head;
> +		--target->req_lim;
> +	}
> +
> +	return ret;
> +}
> +
> +static int srp_queuecommand(struct scsi_cmnd *scmnd,
> +			    void (*done)(struct scsi_cmnd *))
> +{
> +	struct srp_target_port *target = host_to_target(scmnd->device->host);
> +	struct srp_request *req;
> +	struct srp_iu *iu;
> +	struct srp_cmd *cmd;
> +	long req_index;
> +	int len;
> +
> +	if (target->state == SRP_TARGET_CONNECTING)
> +		goto err;
> +
> +	if (target->state == SRP_TARGET_DEAD ||
> +	    target->state == SRP_TARGET_REMOVED) {
> +		scmnd->result = DID_BAD_TARGET << 16;
> +		done(scmnd);
> +		return 0;
> +	}
> +
> +	iu = __srp_get_tx_iu(target);
> +	if (!iu)
> +		goto err;
> +
> +	dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
> +				SRP_MAX_IU_LEN, DMA_TO_DEVICE);
> +
> +	req_index = target->req_head;
> +
> +	scmnd->scsi_done     = done;
> +	scmnd->result        = 0;
> +	scmnd->host_scribble = (void *) req_index;
> +
> +	cmd = iu->buf;
> +	memset(cmd, 0, sizeof *cmd);
> +
> +	cmd->opcode = SRP_CMD;
> +	cmd->lun    = cpu_to_be64((u64) scmnd->device->lun << 48);
> +	cmd->tag    = req_index;
> +	memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
> +
> +	req = &target->req_ring[req_index];
> +
> +	req->scmnd    = scmnd;
> +	req->cmd      = iu;
> +	req->cmd_done = 0;
> +	req->tsk_mgmt = NULL;
> +
> +	len = srp_map_data(scmnd, target, iu);
> +	if (len < 0) {
> +		printk(KERN_ERR PFX "Failed to map data\n");
> +		goto err;
> +	}
> +
> +	if (__srp_post_recv(target, GFP_ATOMIC)) {
> +		printk(KERN_ERR PFX "Recv failed\n");
> +		goto err_unmap;
> +	}
> +
> +	dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
> +				   SRP_MAX_IU_LEN, DMA_TO_DEVICE);
> +
> +	if (__srp_post_send(target, iu, len)) {
> +		printk(KERN_ERR PFX "Send failed\n");
> +		goto err_unmap;
> +	}
> +
> +	target->req_head = req->next;
> +	list_add_tail(&req->list, &target->req_queue);
> +
> +	return 0;
> +
> +err_unmap:
> +	srp_unmap_data(scmnd, target, cmd);
> +
> +err:
> +	return SCSI_MLQUEUE_HOST_BUSY;
> +}
> +
> +static int srp_alloc_iu_bufs(struct srp_target_port *target)
> +{
> +	int i;
> +
> +	for (i = 0; i < SRP_RQ_SIZE; ++i) {
> +		target->rx_ring[i] = srp_alloc_iu(target->srp_host,
> +						  target->max_ti_iu_len,
> +						  GFP_KERNEL, DMA_FROM_DEVICE);
> +		if (!target->rx_ring[i])
> +			goto err;
> +	}
> +
> +	for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
> +		target->tx_ring[i] = srp_alloc_iu(target->srp_host,
> +						  SRP_MAX_IU_LEN,
> +						  GFP_KERNEL, DMA_TO_DEVICE);
> +		if (!target->tx_ring[i])
> +			goto err;
> +	}
> +
> +	return 0;
> +
> +err:
> +	for (i = 0; i < SRP_RQ_SIZE; ++i) {
> +		srp_free_iu(target->srp_host, target->rx_ring[i]);
> +		target->rx_ring[i] = NULL;
> +	}
> +
> +	for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
> +		srp_free_iu(target->srp_host, target->tx_ring[i]);
> +		target->tx_ring[i] = NULL;
> +	}
> +
> +	return -ENOMEM;
> +}
> +
> +static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
> +{
> +	struct srp_target_port *target = cm_id->context;
> +	struct ib_class_port_info *cpi;
> +	struct ib_qp_attr *qp_attr = NULL;
> +	int attr_mask = 0;
> +	int comp = 0;
> +	int ret = 0;
> +
> +	switch (event->event) {
> +	case IB_CM_REQ_ERROR:
> +		printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
> +		comp = 1;
> +		target->status = -ECONNRESET;
> +		break;
> +
> +	case IB_CM_REP_RECEIVED:
> +		comp = 1;
> +
> +		{
> +			struct srp_login_rsp *rsp = event->private_data;
> +
> +			/* XXX check that opcode is SRP RSP */
> +
> +			target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
> +			target->req_lim       = be32_to_cpu(rsp->req_lim_delta);
> +
> +			target->scsi_host->can_queue = min(target->req_lim,
> +							   target->scsi_host->can_queue);
> +		}
> +
> +		target->status = srp_alloc_iu_bufs(target);
> +		if (target->status)
> +			break;
> +
> +		qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
> +		if (!qp_attr) {
> +			target->status = -ENOMEM;
> +			break;
> +		}
> +
> +		qp_attr->qp_state = IB_QPS_RTR;
> +		target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
> +		if (target->status)
> +			break;
> +
> +		qp_attr->rq_psn = 0; /* XXX */
> +		attr_mask |= IB_QP_RQ_PSN;
> +
> +		target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
> +		if (target->status)
> +			break;
> +
> +		target->status = srp_post_recv(target, GFP_KERNEL);
> +		if (target->status)
> +			break;
> +
> +		qp_attr->qp_state = IB_QPS_RTS;
> +		target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
> +		if (target->status)
> +			break;
> +
> +		target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
> +		if (target->status)
> +			break;
> +
> +		target->status = ib_send_cm_rtu(cm_id, NULL, 0);
> +		if (target->status)
> +			break;
> +
> +		break;
> +
> +	case IB_CM_REJ_RECEIVED:
> +		printk(KERN_DEBUG PFX "REJ received\n");
> +		comp = 1;
> +
> +		if (event->param.rej_rcvd.reason == IB_CM_REJ_PORT_CM_REDIRECT) {
> +			cpi = event->param.rej_rcvd.ari;
> +			target->path.dlid = cpi->redirect_lid;
> +			target->path.pkey = cpi->redirect_pkey;
> +			cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
> +			memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
> +
> +			target->status = target->path.dlid ?
> +				SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
> +		} else if (topspin_workarounds &&
> +			   !memcmp(&target->ioc_guid, topspin_oui, 3) &&
> +			   event->param.rej_rcvd.reason == IB_CM_REJ_PORT_REDIRECT) {
> +			/*
> +			 * Topspin/Cisco SRP gateways incorrectly send
> +			 * reject reason code 25 when they mean 24
> +			 * (port redirect).
> +			 */
> +			memcpy(target->path.dgid.raw,
> +			       event->param.rej_rcvd.ari, 16);
> +
> +			printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
> +			       (unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
> +			       (unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
> +
> +			target->status = SRP_PORT_REDIRECT;
> +		} else {
> +			printk(KERN_WARNING "  REJ reason 0x%x\n",
> +			       event->param.rej_rcvd.reason);
> +			target->status = -ECONNRESET;
> +			ret = 1;
> +		}
> +
> +		break;
> +
> +	case IB_CM_MRA_RECEIVED:
> +		printk(KERN_ERR PFX "MRA received\n");
> +		break;
> +
> +	case IB_CM_DREP_RECEIVED:
> +		break;
> +
> +	case IB_CM_TIMEWAIT_EXIT:
> +		printk(KERN_ERR PFX "connection closed\n");
> +
> +		comp = 1;
> +		ret  = 1;
> +		target->status = 0;
> +		break;
> +
> +	default:
> +		printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
> +		break;
> +	}
> +
> +	if (comp)
> +		complete(&target->done);
> +
> +	kfree(qp_attr);
> +
> +	return ret;
> +}
> +
> +static int srp_send_tsk_mgmt(struct scsi_cmnd *scmnd, u8 func)
> +{
> +	struct srp_target_port *target = host_to_target(scmnd->device->host);
> +	struct srp_request *req;
> +	struct srp_iu *iu;
> +	struct srp_tsk_mgmt *tsk_mgmt;
> +	int req_index;
> +	int ret = FAILED;
> +
> +	spin_lock_irq(target->scsi_host->host_lock);
> +
> +	if (scmnd->host_scribble == (void *) -1L)
> +		goto out;
> +
> +	req_index = (long) scmnd->host_scribble;
> +
> +	req = &target->req_ring[req_index];
> +	init_completion(&req->done);
> +
> +	iu = __srp_get_tx_iu(target);
> +	if (!iu)
> +		goto out;
> +
> +	tsk_mgmt = iu->buf;
> +	memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
> +
> +	tsk_mgmt->opcode 	= SRP_TSK_MGMT;
> +	tsk_mgmt->lun 		= cpu_to_be64((u64) scmnd->device->lun << 48);
> +	tsk_mgmt->tag 		= req_index | SRP_TAG_TSK_MGMT;
> +	tsk_mgmt->tsk_mgmt_func = func;
> +	tsk_mgmt->task_tag 	= req_index;
> +
> +	if (__srp_post_send(target, iu, sizeof tsk_mgmt))
> +		goto out;
> +
> +	req->tsk_mgmt = iu;
> +
> +	spin_unlock_irq(target->scsi_host->host_lock);
> +	if (!wait_for_completion_timeout(&req->done,
> +					 msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
> +		return FAILED;
> +	spin_lock_irq(target->scsi_host->host_lock);
> +
> +	if (req->cmd_done) {
> +		list_del(&req->list);
> +		req->next = target->req_head;
> +		target->req_head = req_index;
> +
> +		scmnd->scsi_done(scmnd);
> +	} else if (!req->tsk_status) {
> +		scmnd->result = DID_ABORT << 16;
> +		ret = SUCCESS;
> +	}
> +
> +out:
> +	spin_unlock_irq(target->scsi_host->host_lock);
> +	return ret;
> +}
> +
> +static int srp_abort(struct scsi_cmnd *scmnd)
> +{
> +	printk(KERN_ERR "SRP abort called\n");
> +
> +	return srp_send_tsk_mgmt(scmnd, SRP_TSK_ABORT_TASK);
> +}
> +
> +static int srp_reset_device(struct scsi_cmnd *scmnd)
> +{
> +	printk(KERN_ERR "SRP reset_device called\n");
> +
> +	return srp_send_tsk_mgmt(scmnd, SRP_TSK_LUN_RESET);
> +}
> +
> +static int srp_reset_host(struct scsi_cmnd *scmnd)
> +{
> +	struct srp_target_port *target = host_to_target(scmnd->device->host);
> +	int ret = FAILED;
> +
> +	printk(KERN_ERR PFX "SRP reset_host called\n");
> +
> +	if (!srp_reconnect_target(target))
> +		ret = SUCCESS;
> +
> +	return ret;
> +}
> +
> +static struct scsi_host_template srp_template = {
> +	.module				= THIS_MODULE,
> +	.name				= DRV_NAME,
> +	.info				= srp_target_info,
> +	.queuecommand			= srp_queuecommand,
> +	.eh_abort_handler		= srp_abort,
> +	.eh_device_reset_handler	= srp_reset_device,
> +	.eh_host_reset_handler		= srp_reset_host,
> +	.can_queue			= SRP_SQ_SIZE,
> +	.this_id			= -1,
> +	.sg_tablesize			= SRP_MAX_INDIRECT,
> +	.cmd_per_lun			= SRP_SQ_SIZE,
> +	.use_clustering			= ENABLE_CLUSTERING
> +};
> +
> +static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
> +{
> +	sprintf(target->target_name, "SRP.T10:%016llX",
> +		 (unsigned long long) be64_to_cpu(target->id_ext));
> +
> +	if (scsi_add_host(target->scsi_host, host->dev->dma_device))
> +		return -ENODEV;
> +
> +	down(&host->target_mutex);
> +	list_add_tail(&target->list, &host->target_list);
> +	up(&host->target_mutex);
> +
> +	target->state = SRP_TARGET_LIVE;
> +
> +	/* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
> +	scsi_scan_target(&target->scsi_host->shost_gendev,
> +			 0, target->scsi_id, ~0, 0);
> +
> +	return 0;
> +}
> +
> +static void srp_release_class_dev(struct class_device *class_dev)
> +{
> +	struct srp_host *host =
> +		container_of(class_dev, struct srp_host, class_dev);
> +
> +	complete(&host->released);
> +}
> +
> +static struct class srp_class = {
> +	.name    = "infiniband_srp",
> +	.release = srp_release_class_dev
> +};
> +
> +/*
> + * Target ports are added by writing
> + *
> + *     id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
> + *     pkey=<P_Key>,service_id=<service ID>
> + *
> + * to the add_target sysfs attribute.
> + */
> +enum {
> +	SRP_OPT_ERR		= 0,
> +	SRP_OPT_ID_EXT		= 1 << 0,
> +	SRP_OPT_IOC_GUID	= 1 << 1,
> +	SRP_OPT_DGID		= 1 << 2,
> +	SRP_OPT_PKEY		= 1 << 3,
> +	SRP_OPT_SERVICE_ID	= 1 << 4,
> +	SRP_OPT_MAX_SECT	= 1 << 5,
> +	SRP_OPT_ALL		= (SRP_OPT_ID_EXT	|
> +				   SRP_OPT_IOC_GUID	|
> +				   SRP_OPT_DGID		|
> +				   SRP_OPT_PKEY		|
> +				   SRP_OPT_SERVICE_ID),
> +};
> +
> +static match_table_t srp_opt_tokens = {
> +	{ SRP_OPT_ID_EXT,	"id_ext=%s" 	},
> +	{ SRP_OPT_IOC_GUID,	"ioc_guid=%s" 	},
> +	{ SRP_OPT_DGID,		"dgid=%s" 	},
> +	{ SRP_OPT_PKEY,		"pkey=%x" 	},
> +	{ SRP_OPT_SERVICE_ID,	"service_id=%s" },
> +	{ SRP_OPT_MAX_SECT,     "max_sect=%d" 	},
> +	{ SRP_OPT_ERR,		NULL 		}
> +};
> +
> +static int srp_parse_options(const char *buf, struct srp_target_port *target)
> +{
> +	char *options;
> +	char *p;
> +	char dgid[3];
> +	substring_t args[MAX_OPT_ARGS];
> +	int opt_mask = 0;
> +	int token;
> +	int ret = -EINVAL;
> +	int i;
> +
> +	options = kstrdup(buf, GFP_KERNEL);
> +	if (!options)
> +		return -ENOMEM;
> +
> +	while ((p = strsep(&options, ",")) != NULL) {
> +		if (!*p)
> +			continue;
> +
> +		token = match_token(p, srp_opt_tokens, args);
> +		opt_mask |= token;
> +
> +		switch (token) {
> +		case SRP_OPT_ID_EXT:
> +			p = match_strdup(args);
> +			target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
> +			kfree(p);
> +			break;
> +
> +		case SRP_OPT_IOC_GUID:
> +			p = match_strdup(args);
> +			target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
> +			kfree(p);
> +			break;
> +
> +		case SRP_OPT_DGID:
> +			p = match_strdup(args);
> +			if (strlen(p) != 32)
> +				goto out;
> +
> +			for (i = 0; i < 16; ++i) {
> +				strlcpy(dgid, p + i * 2, 3);
> +				target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
> +			}
> +			break;
> +
> +		case SRP_OPT_PKEY:
> +			if (match_hex(args, &token))
> +				goto out;
> +			target->path.pkey = cpu_to_be16(token);
> +			break;
> +
> +		case SRP_OPT_SERVICE_ID:
> +			p = match_strdup(args);
> +			target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
> +			kfree(p);
> +			break;
> +
> +		case SRP_OPT_MAX_SECT:
> +			if (match_int(args, &token))
> +				goto out;
> +			target->scsi_host->max_sectors = token;
> +			break;
> +
> +		default:
> +			goto out;
> +		}
> +	}
> +
> +	if (opt_mask == SRP_OPT_ALL)
> +		ret = 0;
> +
> +out:
> +	kfree(options);
> +	return ret;
> +}
> +
> +static ssize_t srp_create_target(struct class_device *class_dev,
> +				 const char *buf, size_t count)
> +{
> +	struct srp_host *host =
> +		container_of(class_dev, struct srp_host, class_dev);
> +	struct Scsi_Host *target_host;
> +	struct srp_target_port *target;
> +	int ret;
> +	int i;
> +
> +	target_host = scsi_host_alloc(&srp_template,
> +				      sizeof (struct srp_target_port));
> +	if (!target_host)
> +		return -ENOMEM;
> +
> +	target = host_to_target(target_host);
> +	memset(target, 0, sizeof *target);
> +
> +	target->scsi_host  = target_host;
> +	target->srp_host   = host;
> +
> +	INIT_WORK(&target->work, srp_reconnect_work, target);
> +
> +	for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
> +		target->req_ring[i].next = i + 1;
> +	target->req_ring[SRP_SQ_SIZE - 1].next = -1;
> +	INIT_LIST_HEAD(&target->req_queue);
> +
> +	ret = srp_parse_options(buf, target);
> +	if (ret)
> +		goto err;
> +
> +	target->cm_id = ib_create_cm_id(srp_cm_handler, target);
> +	if (IS_ERR(target->cm_id)) {
> +		ret = PTR_ERR(target->cm_id);
> +		goto err;
> +	}
> +
> +	ib_get_cached_gid(host->dev, host->port, 0, &target->path.sgid);
> +
> +	printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
> +	       "service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
> +	       (unsigned long long) be64_to_cpu(target->id_ext),
> +	       (unsigned long long) be64_to_cpu(target->ioc_guid),
> +	       be16_to_cpu(target->path.pkey),
> +	       (unsigned long long) be64_to_cpu(target->service_id),
> +	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
> +	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
> +	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
> +	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
> +	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
> +	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
> +	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
> +	       (int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
> +
> +	ret = srp_lookup_path(target);
> +	if (ret) {
> +		ib_destroy_cm_id(target->cm_id);
> +		goto err;
> +	}
> +
> +	ret = srp_connect_target(target);
> +	if (ret) {
> +		printk(KERN_ERR PFX "Connection failed\n");
> +		goto err;
> +	}
> +
> +	ret = srp_add_target(host, target);
> +	if (ret)
> +		goto err_disconnect;
> +
> +	return count;
> +
> +err_disconnect:
> +	init_completion(&target->done);
> +	ib_send_cm_dreq(target->cm_id, NULL, 0);
> +	wait_for_completion(&target->done);
> +
> +	ib_destroy_qp(target->qp);
> +	ib_destroy_cq(target->cq);
> +
> +err:
> +	for (i = 0; i < SRP_RQ_SIZE; ++i)
> +		srp_free_iu(target->srp_host, target->rx_ring[i]);
> +	for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
> +		srp_free_iu(target->srp_host, target->tx_ring[i]);
> +
> +	scsi_host_put(target_host);
> +
> +	return ret;
> +}
> +
> +static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
> +
> +static struct srp_host *srp_add_port(struct ib_device *device,
> +				     __be64 node_guid, u8 port)
> +{
> +	struct srp_host *host;
> +
> +	host = kzalloc(sizeof *host, GFP_KERNEL);
> +	if (!host)
> +		return NULL;
> +
> +	INIT_LIST_HEAD(&host->target_list);
> +	init_MUTEX(&host->target_mutex);
> +	init_completion(&host->released);
> +	host->dev  = device;
> +	host->port = port;
> +
> +	host->initiator_port_id[7] = port;
> +	memcpy(host->initiator_port_id + 8, &node_guid, 8);
> +
> +	host->pd   = ib_alloc_pd(device);
> +	if (IS_ERR(host->pd))
> +		goto err_free;
> +
> +	host->mr   = ib_get_dma_mr(host->pd,
> +				   IB_ACCESS_LOCAL_WRITE |
> +				   IB_ACCESS_REMOTE_READ |
> +				   IB_ACCESS_REMOTE_WRITE);
> +	if (IS_ERR(host->mr))
> +		goto err_pd;
> +
> +	host->class_dev.class = &srp_class;
> +	host->class_dev.dev   = device->dma_device;
> +	snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
> +		 device->name, port);
> +
> +	if (class_device_register(&host->class_dev))
> +		goto err_mr;
> +	if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
> +		goto err_class;
> +	/* XXX ibdev / port files as well */
> +
> +	return host;
> +
> +err_class:
> +	class_device_unregister(&host->class_dev);
> +
> +err_mr:
> +	ib_dereg_mr(host->mr);
> +
> +err_pd:
> +	ib_dealloc_pd(host->pd);
> +
> +err_free:
> +	kfree(host);
> +
> +	return NULL;
> +}
> +
> +static void srp_add_one(struct ib_device *device)
> +{
> +	struct list_head *dev_list;
> +	struct srp_host *host;
> +	struct ib_device_attr *dev_attr;
> +	int s, e, p;
> +
> +	dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
> +	if (!dev_attr)
> +		return;
> +
> +	if (ib_query_device(device, dev_attr)) {
> +		printk(KERN_WARNING PFX "Couldn't query node GUID for %s.\n",
> +		       device->name);
> +		goto out;
> +	}
> +
> +	dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
> +	if (!dev_list)
> +		goto out;
> +
> +	INIT_LIST_HEAD(dev_list);
> +
> +	if (device->node_type == IB_NODE_SWITCH) {
> +		s = 0;
> +		e = 0;
> +	} else {
> +		s = 1;
> +		e = device->phys_port_cnt;
> +	}
> +
> +	for (p = s; p <= e; ++p) {
> +		host = srp_add_port(device, dev_attr->node_guid, p);
> +		if (host)
> +			list_add_tail(&host->list, dev_list);
> +	}
> +
> +	ib_set_client_data(device, &srp_client, dev_list);
> +
> +out:
> +	kfree(dev_attr);
> +}
> +
> +static void srp_remove_one(struct ib_device *device)
> +{
> +	struct list_head *dev_list;
> +	struct srp_host *host, *tmp_host;
> +	LIST_HEAD(target_list);
> +	struct srp_target_port *target, *tmp_target;
> +	unsigned long flags;
> +
> +	dev_list = ib_get_client_data(device, &srp_client);
> +
> +	list_for_each_entry_safe(host, tmp_host, dev_list, list) {
> +		class_device_unregister(&host->class_dev);
> +		/*
> +		 * Wait for the sysfs entry to go away, so that no new
> +		 * target ports can be created.
> +		 */
> +		wait_for_completion(&host->released);
> +
> +		/*
> +		 * Mark all target ports as removed, so we stop queueing
> +		 * commands and don't try to reconnect.
> +		 */
> +		down(&host->target_mutex);
> +		list_for_each_entry_safe(target, tmp_target,
> +					 &host->target_list, list) {
> +			spin_lock_irqsave(target->scsi_host->host_lock, flags);
> +			if (target->state != SRP_TARGET_REMOVED)
> +				target->state = SRP_TARGET_REMOVED;
> +			spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
> +		}
> +		up(&host->target_mutex);
> +
> +		/*
> +		 * Wait for any reconnection tasks that may have
> +		 * started before we marked our target ports as
> +		 * removed, and any target port removal tasks.
> +		 */
> +		flush_scheduled_work();
> +
> +		list_for_each_entry_safe(target, tmp_target,
> +					 &host->target_list, list) {
> +			scsi_remove_host(target->scsi_host);
> +			srp_disconnect_target(target);
> +			srp_free_target_ib(target);
> +			scsi_host_put(target->scsi_host);
> +		}
> +
> +		ib_dereg_mr(host->mr);
> +		ib_dealloc_pd(host->pd);
> +		kfree(host);
> +	}
> +
> +	kfree(dev_list);
> +}
> +
> +static int __init srp_init_module(void)
> +{
> +	int ret;
> +
> +	ret = class_register(&srp_class);
> +	if (ret) {
> +		printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
> +		return ret;
> +	}
> +
> +	ret = ib_register_client(&srp_client);
> +	if (ret) {
> +		printk(KERN_ERR PFX "couldn't register IB client\n");
> +		class_unregister(&srp_class);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +static void __exit srp_cleanup_module(void)
> +{
> +	ib_unregister_client(&srp_client);
> +	class_unregister(&srp_class);
> +}
> +
> +module_init(srp_init_module);
> +module_exit(srp_cleanup_module);
> diff --git a/drivers/infiniband/ulp/srp/ib_srp.h b/drivers/infiniband/ulp/srp/ib_srp.h
> new file mode 100644
> --- /dev/null
> +++ b/drivers/infiniband/ulp/srp/ib_srp.h
> @@ -0,0 +1,324 @@
> +/*
> + * Copyright (c) 2005 Cisco Systems.  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.
> + *
> + * $Id: ib_srp.h 3394 2005-09-13 05:04:31Z roland $
> + */
> +
> +#ifndef IB_SRP_H
> +#define IB_SRP_H
> +
> +#include <linux/types.h>
> +#include <linux/list.h>
> +
> +#include <asm/semaphore.h>
> +
> +#include <scsi/scsi_host.h>
> +#include <scsi/scsi_cmnd.h>
> +
> +#include <rdma/ib_verbs.h>
> +#include <rdma/ib_sa.h>
> +#include <rdma/ib_cm.h>
> +
> +enum {
> +	SRP_PATH_REC_TIMEOUT_MS	= 1000,
> +	SRP_ABORT_TIMEOUT_MS	= 5000,
> +
> +	SRP_PORT_REDIRECT	= 1,
> +	SRP_DLID_REDIRECT	= 2,
> +
> +	SRP_MAX_IU_LEN		= 256,
> +
> +	SRP_RQ_SHIFT    	= 6,
> +	SRP_RQ_SIZE		= 1 << SRP_RQ_SHIFT,
> +	SRP_SQ_SIZE		= SRP_RQ_SIZE - 1,
> +	SRP_CQ_SIZE		= SRP_SQ_SIZE + SRP_RQ_SIZE,
> +
> +	SRP_TAG_TSK_MGMT	= 1 << (SRP_RQ_SHIFT + 1)
> +};
> +
> +#define SRP_OP_RECV		(1 << 31)
> +#define SRP_MAX_INDIRECT	((SRP_MAX_IU_LEN -			\
> +				  sizeof (struct srp_cmd) -		\
> +				  sizeof (struct srp_indirect_buf)) / 16)
> +
> +enum srp_target_state {
> +	SRP_TARGET_LIVE,
> +	SRP_TARGET_CONNECTING,
> +	SRP_TARGET_DEAD,
> +	SRP_TARGET_REMOVED
> +};
> +
> +struct srp_host {
> +	u8			initiator_port_id[16];
> +	struct ib_device       *dev;
> +	u8                      port;
> +	struct ib_pd	       *pd;
> +	struct ib_mr	       *mr;
> +	struct class_device	class_dev;
> +	struct list_head	target_list;
> +	struct semaphore        target_mutex;
> +	struct completion	released;
> +	struct list_head	list;
> +};
> +
> +struct srp_request {
> +	struct list_head	list;
> +	struct scsi_cmnd       *scmnd;
> +	struct srp_iu	       *cmd;
> +	struct srp_iu	       *tsk_mgmt;
> +	struct completion	done;
> +	short			next;
> +	u8			cmd_done;
> +	u8			tsk_status;
> +};
> +
> +struct srp_target_port {
> +	__be64			id_ext;
> +	__be64			ioc_guid;
> +	__be64			service_id;
> +	struct srp_host	       *srp_host;
> +	struct Scsi_Host       *scsi_host;
> +	char			target_name[32];
> +	unsigned int		scsi_id;
> +
> +	struct ib_sa_path_rec	path;
> +	struct ib_sa_query     *path_query;
> +	int			path_query_id;
> +
> +	struct ib_cm_id	       *cm_id;
> +	struct ib_cq	       *cq;
> +	struct ib_qp	       *qp;
> +
> +	int			max_ti_iu_len;
> +	s32			req_lim;
> +
> +	unsigned		rx_head;
> +	unsigned		rx_tail;
> +	struct srp_iu	       *rx_ring[SRP_RQ_SIZE];
> +
> +	unsigned		tx_head;
> +	unsigned		tx_tail;
> +	struct srp_iu	       *tx_ring[SRP_SQ_SIZE + 1];
> +
> +	int			req_head;
> +	struct list_head	req_queue;
> +	struct srp_request	req_ring[SRP_SQ_SIZE];
> +
> +	struct work_struct	work;
> +
> +	struct list_head	list;
> +	struct completion	done;
> +	int			status;
> +	enum srp_target_state	state;
> +};
> +
> +struct srp_iu {
> +	dma_addr_t		dma;
> +	void		       *buf;
> +	size_t			size;
> +	enum dma_data_direction	direction;
> +};
> +
> +/*
> + * SRP protocol definitions
> + */
> +
> +enum {
> +	SRP_LOGIN_REQ	= 0x00,
> +	SRP_TSK_MGMT	= 0x01,
> +	SRP_CMD		= 0x02,
> +	SRP_I_LOGOUT	= 0x03,
> +	SRP_LOGIN_RSP	= 0xc0,
> +	SRP_RSP		= 0xc1,
> +	SRP_LOGIN_REJ	= 0xc2,
> +	SRP_T_LOGOUT	= 0x80,
> +	SRP_CRED_REQ	= 0x81,
> +	SRP_AER_REQ	= 0x82,
> +	SRP_CRED_RSP	= 0x41,
> +	SRP_AER_RSP	= 0x42
> +};
> +
> +enum {
> +	SRP_BUF_FORMAT_DIRECT	= 1 << 1,
> +	SRP_BUF_FORMAT_INDIRECT	= 1 << 2
> +};
> +
> +enum {
> +	SRP_NO_DATA_DESC	= 0,
> +	SRP_DATA_DESC_DIRECT	= 1,
> +	SRP_DATA_DESC_INDIRECT	= 2
> +};
> +
> +enum {
> +	SRP_TSK_ABORT_TASK	= 0x01,
> +	SRP_TSK_ABORT_TASK_SET	= 0x02,
> +	SRP_TSK_CLEAR_TASK_SET	= 0x04,
> +	SRP_TSK_LUN_RESET	= 0x08,
> +	SRP_TSK_CLEAR_ACA	= 0x40
> +};
> +
> +struct srp_direct_buf {
> +	__be64	va;
> +	__be32	key;
> +	__be32  len;
> +};
> +
> +/*
> + * We need the packed attribute because the SRP spec puts the list of
> + * descriptors at an offset of 20, which is not aligned to the size
> + * of struct srp_direct_buf.
> + */
> +struct srp_indirect_buf {
> +	struct srp_direct_buf	table_desc;
> +	__be32			len;
> +	struct srp_direct_buf	desc_list[0] __attribute__((packed));
> +};
> +
> +enum {
> +	SRP_MULTICHAN_SINGLE = 0,
> +	SRP_MULTICHAN_MULTI  = 1
> +};
> +
> +struct srp_login_req {
> +	u8	opcode;
> +	u8	reserved1[7];
> +	u64	tag;
> +	__be32	req_it_iu_len;
> +	u8	reserved2[4];
> +	__be16	req_buf_fmt;
> +	u8	req_flags;
> +	u8	reserved3[5];
> +	u8	initiator_port_id[16];
> +	u8	target_port_id[16];
> +};
> +
> +struct srp_login_rsp {
> +	u8	opcode;
> +	u8	reserved1[3];
> +	__be32	req_lim_delta;
> +	u64	tag;
> +	__be32	max_it_iu_len;
> +	__be32	max_ti_iu_len;
> +	__be16	buf_fmt;
> +	u8	rsp_flags;
> +	u8	reserved2[25];
> +};
> +
> +struct srp_login_rej {
> +	u8	opcode;
> +	u8	reserved1[3];
> +	__be32	reason;
> +	u64	tag;
> +	u8	reserved2[8];
> +	__be16	buf_fmt;
> +	u8	reserved3[6];
> +};
> +
> +struct srp_i_logout {
> +	u8	opcode;
> +	u8	reserved[7];
> +	u64	tag;
> +};
> +
> +struct srp_t_logout {
> +	u8	opcode;
> +	u8	sol_not;
> +	u8	reserved[2];
> +	__be32	reason;
> +	u64	tag;
> +};
> +
> +/*
> + * We need the packed attribute because the SRP spec only aligns the
> + * 8-byte LUN field to 4 bytes.
> + */
> +struct srp_tsk_mgmt {
> +	u8	opcode;
> +	u8	sol_not;
> +	u8	reserved1[6];
> +	u64	tag;
> +	u8	reserved2[4];
> +	__be64	lun __attribute__((packed));
> +	u8	reserved3[2];
> +	u8	tsk_mgmt_func;
> +	u8	reserved4;
> +	u64	task_tag;
> +	u8	reserved5[8];
> +};
> +
> +/*
> + * We need the packed attribute because the SRP spec only aligns the
> + * 8-byte LUN field to 4 bytes.
> + */
> +struct srp_cmd {
> +	u8	opcode;
> +	u8	sol_not;
> +	u8	reserved1[3];
> +	u8	buf_fmt;
> +	u8	data_out_desc_cnt;
> +	u8	data_in_desc_cnt;
> +	u64	tag;
> +	u8	reserved2[4];
> +	__be64	lun __attribute__((packed));
> +	u8	reserved3;
> +	u8	task_attr;
> +	u8	reserved4;
> +	u8	add_cdb_len;
> +	u8	cdb[16];
> +	u8	add_data[0];
> +};
> +
> +enum {
> +	SRP_RSP_FLAG_RSPVALID = 1 << 0,
> +	SRP_RSP_FLAG_SNSVALID = 1 << 1,
> +	SRP_RSP_FLAG_DOOVER   = 1 << 2,
> +	SRP_RSP_FLAG_DOUNDER  = 1 << 3,
> +	SRP_RSP_FLAG_DIOVER   = 1 << 4,
> +	SRP_RSP_FLAG_DIUNDER  = 1 << 5
> +};
> +
> +struct srp_rsp {
> +	u8	opcode;
> +	u8	sol_not;
> +	u8	reserved1[2];
> +	__be32	req_lim_delta;
> +	u64	tag;
> +	u8	reserved2[2];
> +	u8	flags;
> +	u8	status;
> +	__be32	data_out_res_cnt;
> +	__be32	data_in_res_cnt;
> +	__be32	sense_data_len;
> +	__be32	resp_data_len;
> +	u8	data[0];
> +};
> +
> +#endif /* IB_SRP_H */
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-- 
--------------------------------------------------------------------------
Troy Benjegerdes                'da hozer'                hozer at hozed.org  

Somone asked me why I work on this free (http://www.fsf.org/philosophy/)
software stuff and not get a real job. Charles Shultz had the best answer:

"Why do musicians compose symphonies and poets write poems? They do it
because life wouldn't have any meaning for them if they didn't. That's why
I draw cartoons. It's my life." -- Charles Shultz



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