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 <[email protected]>
---
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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