summaryrefslogtreecommitdiff
path: root/drivers/infiniband
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/Kconfig2
-rw-r--r--drivers/infiniband/Makefile1
-rw-r--r--drivers/infiniband/core/uverbs_cmd.c2
-rw-r--r--drivers/infiniband/core/uverbs_main.c6
-rw-r--r--drivers/infiniband/ulp/iser/Kconfig11
-rw-r--r--drivers/infiniband/ulp/iser/Makefile4
-rw-r--r--drivers/infiniband/ulp/iser/iscsi_iser.c790
-rw-r--r--drivers/infiniband/ulp/iser/iscsi_iser.h354
-rw-r--r--drivers/infiniband/ulp/iser/iser_initiator.c738
-rw-r--r--drivers/infiniband/ulp/iser/iser_memory.c401
-rw-r--r--drivers/infiniband/ulp/iser/iser_verbs.c827
11 files changed, 3129 insertions, 7 deletions
diff --git a/drivers/infiniband/Kconfig b/drivers/infiniband/Kconfig
index ba2d6505e9a4..69a53d476b5b 100644
--- a/drivers/infiniband/Kconfig
+++ b/drivers/infiniband/Kconfig
@@ -41,4 +41,6 @@ source "drivers/infiniband/ulp/ipoib/Kconfig"
source "drivers/infiniband/ulp/srp/Kconfig"
+source "drivers/infiniband/ulp/iser/Kconfig"
+
endmenu
diff --git a/drivers/infiniband/Makefile b/drivers/infiniband/Makefile
index eea27322a22d..c7ff58c1d0e5 100644
--- a/drivers/infiniband/Makefile
+++ b/drivers/infiniband/Makefile
@@ -3,3 +3,4 @@ obj-$(CONFIG_INFINIBAND_MTHCA) += hw/mthca/
obj-$(CONFIG_IPATH_CORE) += hw/ipath/
obj-$(CONFIG_INFINIBAND_IPOIB) += ulp/ipoib/
obj-$(CONFIG_INFINIBAND_SRP) += ulp/srp/
+obj-$(CONFIG_INFINIBAND_ISER) += ulp/iser/
diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c
index 76bf61e9b552..a908a7bdcd7f 100644
--- a/drivers/infiniband/core/uverbs_cmd.c
+++ b/drivers/infiniband/core/uverbs_cmd.c
@@ -1530,7 +1530,6 @@ ssize_t ib_uverbs_post_send(struct ib_uverbs_file *file,
out_put:
put_qp_read(qp);
-out:
while (wr) {
if (is_ud && wr->wr.ud.ah)
put_ah_read(wr->wr.ud.ah);
@@ -1539,6 +1538,7 @@ out:
wr = next;
}
+out:
kfree(user_wr);
return ret ? ret : in_len;
diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c
index e57d3c50f75f..e725cccc7cde 100644
--- a/drivers/infiniband/core/uverbs_main.c
+++ b/drivers/infiniband/core/uverbs_main.c
@@ -188,7 +188,6 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
ib_destroy_ah(ah);
- list_del(&uobj->list);
kfree(uobj);
}
@@ -200,7 +199,6 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
ib_uverbs_detach_umcast(qp, uqp);
ib_destroy_qp(qp);
- list_del(&uobj->list);
ib_uverbs_release_uevent(file, &uqp->uevent);
kfree(uqp);
}
@@ -213,7 +211,6 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
ib_destroy_cq(cq);
- list_del(&uobj->list);
ib_uverbs_release_ucq(file, ev_file, ucq);
kfree(ucq);
}
@@ -225,7 +222,6 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
ib_destroy_srq(srq);
- list_del(&uobj->list);
ib_uverbs_release_uevent(file, uevent);
kfree(uevent);
}
@@ -243,7 +239,6 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
memobj = container_of(uobj, struct ib_umem_object, uobject);
ib_umem_release_on_close(mrdev, &memobj->umem);
- list_del(&uobj->list);
kfree(memobj);
}
@@ -252,7 +247,6 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
ib_dealloc_pd(pd);
- list_del(&uobj->list);
kfree(uobj);
}
diff --git a/drivers/infiniband/ulp/iser/Kconfig b/drivers/infiniband/ulp/iser/Kconfig
new file mode 100644
index 000000000000..fead87d1eff9
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/Kconfig
@@ -0,0 +1,11 @@
+config INFINIBAND_ISER
+ tristate "ISCSI RDMA Protocol"
+ depends on INFINIBAND && SCSI
+ select SCSI_ISCSI_ATTRS
+ ---help---
+ Support for the ISCSI RDMA Protocol over InfiniBand. This
+ allows you to access storage devices that speak ISER/ISCSI
+ over InfiniBand.
+
+ The ISER protocol is defined by IETF.
+ See <http://www.ietf.org/>.
diff --git a/drivers/infiniband/ulp/iser/Makefile b/drivers/infiniband/ulp/iser/Makefile
new file mode 100644
index 000000000000..fe6cd15f2317
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/Makefile
@@ -0,0 +1,4 @@
+obj-$(CONFIG_INFINIBAND_ISER) += ib_iser.o
+
+ib_iser-y := iser_verbs.o iser_initiator.o iser_memory.o \
+ iscsi_iser.o
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.c b/drivers/infiniband/ulp/iser/iscsi_iser.c
new file mode 100644
index 000000000000..4c3f2de2a06e
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.c
@@ -0,0 +1,790 @@
+/*
+ * iSCSI Initiator over iSER Data-Path
+ *
+ * Copyright (C) 2004 Dmitry Yusupov
+ * Copyright (C) 2004 Alex Aizman
+ * Copyright (C) 2005 Mike Christie
+ * Copyright (c) 2005, 2006 Voltaire, Inc. All rights reserved.
+ * maintained by openib-general@openib.org
+ *
+ * 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.
+ *
+ * Credits:
+ * Christoph Hellwig
+ * FUJITA Tomonori
+ * Arne Redlich
+ * Zhenyu Wang
+ * Modified by:
+ * Erez Zilber
+ *
+ *
+ * $Id: iscsi_iser.c 6965 2006-05-07 11:36:20Z ogerlitz $
+ */
+
+#include <linux/types.h>
+#include <linux/list.h>
+#include <linux/hardirq.h>
+#include <linux/kfifo.h>
+#include <linux/blkdev.h>
+#include <linux/init.h>
+#include <linux/ioctl.h>
+#include <linux/devfs_fs_kernel.h>
+#include <linux/cdev.h>
+#include <linux/in.h>
+#include <linux/net.h>
+#include <linux/scatterlist.h>
+#include <linux/delay.h>
+
+#include <net/sock.h>
+
+#include <asm/uaccess.h>
+
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_device.h>
+#include <scsi/scsi_eh.h>
+#include <scsi/scsi_tcq.h>
+#include <scsi/scsi_host.h>
+#include <scsi/scsi.h>
+#include <scsi/scsi_transport_iscsi.h>
+
+#include "iscsi_iser.h"
+
+static unsigned int iscsi_max_lun = 512;
+module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
+
+int iser_debug_level = 0;
+
+MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover "
+ "v" DRV_VER " (" DRV_DATE ")");
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
+
+module_param_named(debug_level, iser_debug_level, int, 0644);
+MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
+
+struct iser_global ig;
+
+void
+iscsi_iser_recv(struct iscsi_conn *conn,
+ struct iscsi_hdr *hdr, char *rx_data, int rx_data_len)
+{
+ int rc = 0;
+ uint32_t ret_itt;
+ int datalen;
+ int ahslen;
+
+ /* verify PDU length */
+ datalen = ntoh24(hdr->dlength);
+ if (datalen != rx_data_len) {
+ printk(KERN_ERR "iscsi_iser: datalen %d (hdr) != %d (IB) \n",
+ datalen, rx_data_len);
+ rc = ISCSI_ERR_DATALEN;
+ goto error;
+ }
+
+ /* read AHS */
+ ahslen = hdr->hlength * 4;
+
+ /* verify itt (itt encoding: age+cid+itt) */
+ rc = iscsi_verify_itt(conn, hdr, &ret_itt);
+
+ if (!rc)
+ rc = iscsi_complete_pdu(conn, hdr, rx_data, rx_data_len);
+
+ if (rc && rc != ISCSI_ERR_NO_SCSI_CMD)
+ goto error;
+
+ return;
+error:
+ iscsi_conn_failure(conn, rc);
+}
+
+
+/**
+ * iscsi_iser_cmd_init - Initialize iSCSI SCSI_READ or SCSI_WRITE commands
+ *
+ **/
+static void
+iscsi_iser_cmd_init(struct iscsi_cmd_task *ctask)
+{
+ struct iscsi_iser_conn *iser_conn = ctask->conn->dd_data;
+ struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
+ struct scsi_cmnd *sc = ctask->sc;
+
+ iser_ctask->command_sent = 0;
+ iser_ctask->iser_conn = iser_conn;
+
+ if (sc->sc_data_direction == DMA_TO_DEVICE) {
+ BUG_ON(ctask->total_length == 0);
+ /* bytes to be sent via RDMA operations */
+ iser_ctask->rdma_data_count = ctask->total_length -
+ ctask->imm_count -
+ ctask->unsol_count;
+
+ debug_scsi("cmd [itt %x total %d imm %d unsol_data %d "
+ "rdma_data %d]\n",
+ ctask->itt, ctask->total_length, ctask->imm_count,
+ ctask->unsol_count, iser_ctask->rdma_data_count);
+ } else
+ /* bytes to be sent via RDMA operations */
+ iser_ctask->rdma_data_count = ctask->total_length;
+
+ iser_ctask_rdma_init(iser_ctask);
+}
+
+/**
+ * iscsi_mtask_xmit - xmit management(immediate) task
+ * @conn: iscsi connection
+ * @mtask: task management task
+ *
+ * Notes:
+ * The function can return -EAGAIN in which case caller must
+ * call it again later, or recover. '0' return code means successful
+ * xmit.
+ *
+ **/
+static int
+iscsi_iser_mtask_xmit(struct iscsi_conn *conn,
+ struct iscsi_mgmt_task *mtask)
+{
+ int error = 0;
+
+ debug_scsi("mtask deq [cid %d itt 0x%x]\n", conn->id, mtask->itt);
+
+ error = iser_send_control(conn, mtask);
+
+ /* since iser xmits control with zero copy, mtasks can not be recycled
+ * right after sending them.
+ * The recycling scheme is based on whether a response is expected
+ * - if yes, the mtask is recycled at iscsi_complete_pdu
+ * - if no, the mtask is recycled at iser_snd_completion
+ */
+ if (error && error != -EAGAIN)
+ iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+
+ return error;
+}
+
+static int
+iscsi_iser_ctask_xmit_unsol_data(struct iscsi_conn *conn,
+ struct iscsi_cmd_task *ctask)
+{
+ struct iscsi_data hdr;
+ int error = 0;
+ struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
+
+ /* Send data-out PDUs while there's still unsolicited data to send */
+ while (ctask->unsol_count > 0) {
+ iscsi_prep_unsolicit_data_pdu(ctask, &hdr,
+ iser_ctask->rdma_data_count);
+
+ debug_scsi("Sending data-out: itt 0x%x, data count %d\n",
+ hdr.itt, ctask->data_count);
+
+ /* the buffer description has been passed with the command */
+ /* Send the command */
+ error = iser_send_data_out(conn, ctask, &hdr);
+ if (error) {
+ ctask->unsol_datasn--;
+ goto iscsi_iser_ctask_xmit_unsol_data_exit;
+ }
+ ctask->unsol_count -= ctask->data_count;
+ debug_scsi("Need to send %d more as data-out PDUs\n",
+ ctask->unsol_count);
+ }
+
+iscsi_iser_ctask_xmit_unsol_data_exit:
+ return error;
+}
+
+static int
+iscsi_iser_ctask_xmit(struct iscsi_conn *conn,
+ struct iscsi_cmd_task *ctask)
+{
+ struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
+ int error = 0;
+
+ debug_scsi("ctask deq [cid %d itt 0x%x]\n",
+ conn->id, ctask->itt);
+
+ /*
+ * serialize with TMF AbortTask
+ */
+ if (ctask->mtask)
+ return error;
+
+ /* Send the cmd PDU */
+ if (!iser_ctask->command_sent) {
+ error = iser_send_command(conn, ctask);
+ if (error)
+ goto iscsi_iser_ctask_xmit_exit;
+ iser_ctask->command_sent = 1;
+ }
+
+ /* Send unsolicited data-out PDU(s) if necessary */
+ if (ctask->unsol_count)
+ error = iscsi_iser_ctask_xmit_unsol_data(conn, ctask);
+
+ iscsi_iser_ctask_xmit_exit:
+ if (error && error != -EAGAIN)
+ iscsi_conn_failure(conn, ISCSI_ERR_CONN_FAILED);
+ return error;
+}
+
+static void
+iscsi_iser_cleanup_ctask(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
+{
+ struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
+
+ if (iser_ctask->status == ISER_TASK_STATUS_STARTED) {
+ iser_ctask->status = ISER_TASK_STATUS_COMPLETED;
+ iser_ctask_rdma_finalize(iser_ctask);
+ }
+}
+
+static struct iser_conn *
+iscsi_iser_ib_conn_lookup(__u64 ep_handle)
+{
+ struct iser_conn *ib_conn;
+ struct iser_conn *uib_conn = (struct iser_conn *)(unsigned long)ep_handle;
+
+ mutex_lock(&ig.connlist_mutex);
+ list_for_each_entry(ib_conn, &ig.connlist, conn_list) {
+ if (ib_conn == uib_conn) {
+ mutex_unlock(&ig.connlist_mutex);
+ return ib_conn;
+ }
+ }
+ mutex_unlock(&ig.connlist_mutex);
+ iser_err("no conn exists for eph %llx\n",(unsigned long long)ep_handle);
+ return NULL;
+}
+
+static struct iscsi_cls_conn *
+iscsi_iser_conn_create(struct iscsi_cls_session *cls_session, uint32_t conn_idx)
+{
+ struct iscsi_conn *conn;
+ struct iscsi_cls_conn *cls_conn;
+ struct iscsi_iser_conn *iser_conn;
+
+ cls_conn = iscsi_conn_setup(cls_session, conn_idx);
+ if (!cls_conn)
+ return NULL;
+ conn = cls_conn->dd_data;
+
+ /*
+ * due to issues with the login code re iser sematics
+ * this not set in iscsi_conn_setup - FIXME
+ */
+ conn->max_recv_dlength = 128;
+
+ iser_conn = kzalloc(sizeof(*iser_conn), GFP_KERNEL);
+ if (!iser_conn)
+ goto conn_alloc_fail;
+
+ /* currently this is the only field which need to be initiated */
+ rwlock_init(&iser_conn->lock);
+
+ conn->dd_data = iser_conn;
+ iser_conn->iscsi_conn = conn;
+
+ return cls_conn;
+
+conn_alloc_fail:
+ iscsi_conn_teardown(cls_conn);
+ return NULL;
+}
+
+static void
+iscsi_iser_conn_destroy(struct iscsi_cls_conn *cls_conn)
+{
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_iser_conn *iser_conn = conn->dd_data;
+
+ iscsi_conn_teardown(cls_conn);
+ kfree(iser_conn);
+}
+
+static int
+iscsi_iser_conn_bind(struct iscsi_cls_session *cls_session,
+ struct iscsi_cls_conn *cls_conn, uint64_t transport_eph,
+ int is_leading)
+{
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_iser_conn *iser_conn;
+ struct iser_conn *ib_conn;
+ int error;
+
+ error = iscsi_conn_bind(cls_session, cls_conn, is_leading);
+ if (error)
+ return error;
+
+ /* the transport ep handle comes from user space so it must be
+ * verified against the global ib connections list */
+ ib_conn = iscsi_iser_ib_conn_lookup(transport_eph);
+ if (!ib_conn) {
+ iser_err("can't bind eph %llx\n",
+ (unsigned long long)transport_eph);
+ return -EINVAL;
+ }
+ /* binds the iSER connection retrieved from the previously
+ * connected ep_handle to the iSCSI layer connection. exchanges
+ * connection pointers */
+ iser_err("binding iscsi conn %p to iser_conn %p\n",conn,ib_conn);
+ iser_conn = conn->dd_data;
+ ib_conn->iser_conn = iser_conn;
+ iser_conn->ib_conn = ib_conn;
+
+ conn->recv_lock = &iser_conn->lock;
+
+ return 0;
+}
+
+static int
+iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
+{
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ int err;
+
+ err = iscsi_conn_start(cls_conn);
+ if (err)
+ return err;
+
+ return iser_conn_set_full_featured_mode(conn);
+}
+
+static void
+iscsi_iser_conn_terminate(struct iscsi_conn *conn)
+{
+ struct iscsi_iser_conn *iser_conn = conn->dd_data;
+ struct iser_conn *ib_conn = iser_conn->ib_conn;
+
+ BUG_ON(!ib_conn);
+ /* starts conn teardown process, waits until all previously *
+ * posted buffers get flushed, deallocates all conn resources */
+ iser_conn_terminate(ib_conn);
+ iser_conn->ib_conn = NULL;
+ conn->recv_lock = NULL;
+}
+
+
+static struct iscsi_transport iscsi_iser_transport;
+
+static struct iscsi_cls_session *
+iscsi_iser_session_create(struct iscsi_transport *iscsit,
+ struct scsi_transport_template *scsit,
+ uint32_t initial_cmdsn, uint32_t *hostno)
+{
+ struct iscsi_cls_session *cls_session;
+ struct iscsi_session *session;
+ int i;
+ uint32_t hn;
+ struct iscsi_cmd_task *ctask;
+ struct iscsi_mgmt_task *mtask;
+ struct iscsi_iser_cmd_task *iser_ctask;
+ struct iser_desc *desc;
+
+ cls_session = iscsi_session_setup(iscsit, scsit,
+ sizeof(struct iscsi_iser_cmd_task),
+ sizeof(struct iser_desc),
+ initial_cmdsn, &hn);
+ if (!cls_session)
+ return NULL;
+
+ *hostno = hn;
+ session = class_to_transport_session(cls_session);
+
+ /* libiscsi setup itts, data and pool so just set desc fields */
+ for (i = 0; i < session->cmds_max; i++) {
+ ctask = session->cmds[i];
+ iser_ctask = ctask->dd_data;
+ ctask->hdr = (struct iscsi_cmd *)&iser_ctask->desc.iscsi_header;
+ }
+
+ for (i = 0; i < session->mgmtpool_max; i++) {
+ mtask = session->mgmt_cmds[i];
+ desc = mtask->dd_data;
+ mtask->hdr = &desc->iscsi_header;
+ desc->data = mtask->data;
+ }
+
+ return cls_session;
+}
+
+static int
+iscsi_iser_conn_set_param(struct iscsi_cls_conn *cls_conn,
+ enum iscsi_param param, uint32_t value)
+{
+ struct iscsi_conn *conn = cls_conn->dd_data;
+ struct iscsi_session *session = conn->session;
+
+ spin_lock_bh(&session->lock);
+ if (conn->c_stage != ISCSI_CONN_INITIAL_STAGE &&
+ conn->stop_stage != STOP_CONN_RECOVER) {
+ printk(KERN_ERR "iscsi_iser: can not change parameter [%d]\n",
+ param);
+ spin_unlock_bh(&session->lock);
+ return 0;
+ }
+ spin_unlock_bh(&session->lock);
+
+ switch (param) {
+ case ISCSI_PARAM_MAX_RECV_DLENGTH:
+ /* TBD */
+ break;
+ case ISCSI_PARAM_MAX_XMIT_DLENGTH:
+ conn->max_xmit_dlength = value;
+ break;
+ case ISCSI_PARAM_HDRDGST_EN:
+ if (value) {
+ printk(KERN_ERR "DataDigest wasn't negotiated to None");
+ return -EPROTO;
+ }
+ break;
+ case ISCSI_PARAM_DATADGST_EN:
+ if (value) {
+ printk(KERN_ERR "DataDigest wasn't negotiated to None");
+ return -EPROTO;
+ }
+ break;
+ case ISCSI_PARAM_INITIAL_R2T_EN:
+ session->initial_r2t_en = value;
+ break;
+ case ISCSI_PARAM_IMM_DATA_EN:
+ session->imm_data_en = value;
+ break;
+ case ISCSI_PARAM_FIRST_BURST:
+ session->first_burst = value;
+ break;
+ case ISCSI_PARAM_MAX_BURST:
+ session->max_burst = value;
+ break;
+ case ISCSI_PARAM_PDU_INORDER_EN:
+ session->pdu_inorder_en = value;
+ break;
+ case ISCSI_PARAM_DATASEQ_INORDER_EN:
+ session->dataseq_inorder_en = value;
+ break;
+ case ISCSI_PARAM_ERL:
+ session->erl = value;
+ break;
+ case ISCSI_PARAM_IFMARKER_EN:
+ if (value) {
+ printk(KERN_ERR "IFMarker wasn't negotiated to No");
+ return -EPROTO;
+ }
+ break;
+ case ISCSI_PARAM_OFMARKER_EN:
+ if (value) {
+ printk(KERN_ERR "OFMarker wasn't negotiated to No");
+ return -EPROTO;
+ }
+ break;
+ default:
+ break;
+ }
+
+ return 0;
+}
+
+static int
+iscsi_iser_session_get_param(struct iscsi_cls_session *cls_session,
+ enum iscsi_param param, uint32_t *value)
+{
+ struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
+ struct iscsi_session *session = iscsi_hostdata(shost->hostdata);
+
+ switch (param) {
+ case ISCSI_PARAM_INITIAL_R2T_EN:
+ *value = session->initial_r2t_en;
+ break;
+ case ISCSI_PARAM_MAX_R2T:
+ *value = session->max_r2t;
+ break;
+ case ISCSI_PARAM_IMM_DATA_EN:
+ *value = session->imm_data_en;
+ break;
+ case ISCSI_PARAM_FIRST_BURST:
+ *value = session->first_burst;
+ break;
+ case ISCSI_PARAM_MAX_BURST:
+ *value = session->max_burst;
+ break;
+ case ISCSI_PARAM_PDU_INORDER_EN:
+ *value = session->pdu_inorder_en;
+ break;
+ case ISCSI_PARAM_DATASEQ_INORDER_EN:
+ *value = session->dataseq_inorder_en;
+ break;
+ case ISCSI_PARAM_ERL:
+ *value = session->erl;
+ break;
+ case ISCSI_PARAM_IFMARKER_EN:
+ *value = 0;
+ break;
+ case ISCSI_PARAM_OFMARKER_EN:
+ *value = 0;
+ break;
+ default:
+ return ISCSI_ERR_PARAM_NOT_FOUND;
+ }
+
+ return 0;
+}
+
+static int
+iscsi_iser_conn_get_param(struct iscsi_cls_conn *cls_conn,
+ enum iscsi_param param, uint32_t *value)
+{
+ struct iscsi_conn *conn = cls_conn->dd_data;
+
+ switch(param) {
+ case ISCSI_PARAM_MAX_RECV_DLENGTH:
+ *value = conn->max_recv_dlength;
+ break;
+ case ISCSI_PARAM_MAX_XMIT_DLENGTH:
+ *value = conn->max_xmit_dlength;
+ break;
+ case ISCSI_PARAM_HDRDGST_EN:
+ *value = 0;
+ break;
+ case ISCSI_PARAM_DATADGST_EN:
+ *value = 0;
+ break;
+ /*case ISCSI_PARAM_TARGET_RECV_DLENGTH:
+ *value = conn->target_recv_dlength;
+ break;
+ case ISCSI_PARAM_INITIATOR_RECV_DLENGTH:
+ *value = conn->initiator_recv_dlength;
+ break;*/
+ default:
+ return ISCSI_ERR_PARAM_NOT_FOUND;
+ }
+
+ return 0;
+}
+
+
+static void
+iscsi_iser_conn_get_stats(struct iscsi_cls_conn *cls_conn, struct iscsi_stats *stats)
+{
+ struct iscsi_conn *conn = cls_conn->dd_data;
+
+ stats->txdata_octets = conn->txdata_octets;
+ stats->rxdata_octets = conn->rxdata_octets;
+ stats->scsicmd_pdus = conn->scsicmd_pdus_cnt;
+ stats->dataout_pdus = conn->dataout_pdus_cnt;
+ stats->scsirsp_pdus = conn->scsirsp_pdus_cnt;
+ stats->datain_pdus = conn->datain_pdus_cnt; /* always 0 */
+ stats->r2t_pdus = conn->r2t_pdus_cnt; /* always 0 */
+ stats->tmfcmd_pdus = conn->tmfcmd_pdus_cnt;
+ stats->tmfrsp_pdus = conn->tmfrsp_pdus_cnt;
+ stats->custom_length = 3;
+ strcpy(stats->custom[0].desc, "qp_tx_queue_full");
+ stats->custom[0].value = 0; /* TB iser_conn->qp_tx_queue_full; */
+ strcpy(stats->custom[1].desc, "fmr_map_not_avail");
+ stats->custom[1].value = 0; /* TB iser_conn->fmr_map_not_avail */;
+ strcpy(stats->custom[2].desc, "eh_abort_cnt");
+ stats->custom[2].value = conn->eh_abort_cnt;
+}
+
+static int
+iscsi_iser_ep_connect(struct sockaddr *dst_addr, int non_blocking,
+ __u64 *ep_handle)
+{
+ int err;
+ struct iser_conn *ib_conn;
+
+ err = iser_conn_init(&ib_conn);
+ if (err)
+ goto out;
+
+ err = iser_connect(ib_conn, NULL, (struct sockaddr_in *)dst_addr, non_blocking);
+ if (!err)
+ *ep_handle = (__u64)(unsigned long)ib_conn;
+
+out:
+ return err;
+}
+
+static int
+iscsi_iser_ep_poll(__u64 ep_handle, int timeout_ms)
+{
+ struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle);
+ int rc;
+
+ if (!ib_conn)
+ return -EINVAL;
+
+ rc = wait_event_interruptible_timeout(ib_conn->wait,
+ ib_conn->state == ISER_CONN_UP,
+ msecs_to_jiffies(timeout_ms));
+
+ /* if conn establishment failed, return error code to iscsi */
+ if (!rc &&
+ (ib_conn->state == ISER_CONN_TERMINATING ||
+ ib_conn->state == ISER_CONN_DOWN))
+ rc = -1;
+
+ iser_err("ib conn %p rc = %d\n", ib_conn, rc);
+
+ if (rc > 0)
+ return 1; /* success, this is the equivalent of POLLOUT */
+ else if (!rc)
+ return 0; /* timeout */
+ else
+ return rc; /* signal */
+}
+
+static void
+iscsi_iser_ep_disconnect(__u64 ep_handle)
+{
+ struct iser_conn *ib_conn = iscsi_iser_ib_conn_lookup(ep_handle);
+
+ if (!ib_conn)
+ return;
+
+ iser_err("ib conn %p state %d\n",ib_conn, ib_conn->state);
+
+ iser_conn_terminate(ib_conn);
+}
+
+static struct scsi_host_template iscsi_iser_sht = {
+ .name = "iSCSI Initiator over iSER, v." DRV_VER,
+ .queuecommand = iscsi_queuecommand,
+ .can_queue = ISCSI_XMIT_CMDS_MAX - 1,
+ .sg_tablesize = ISCSI_ISER_SG_TABLESIZE,
+ .cmd_per_lun = ISCSI_MAX_CMD_PER_LUN,
+ .eh_abort_handler = iscsi_eh_abort,
+ .eh_host_reset_handler = iscsi_eh_host_reset,
+ .use_clustering = DISABLE_CLUSTERING,
+ .proc_name = "iscsi_iser",
+ .this_id = -1,
+};
+
+static struct iscsi_transport iscsi_iser_transport = {
+ .owner = THIS_MODULE,
+ .name = "iser",
+ .caps = CAP_RECOVERY_L0 | CAP_MULTI_R2T,
+ .param_mask = ISCSI_MAX_RECV_DLENGTH |
+ ISCSI_MAX_XMIT_DLENGTH |
+ ISCSI_HDRDGST_EN |
+ ISCSI_DATADGST_EN |
+ ISCSI_INITIAL_R2T_EN |
+ ISCSI_MAX_R2T |
+ ISCSI_IMM_DATA_EN |
+ ISCSI_FIRST_BURST |
+ ISCSI_MAX_BURST |
+ ISCSI_PDU_INORDER_EN |
+ ISCSI_DATASEQ_INORDER_EN,
+ .host_template = &iscsi_iser_sht,
+ .conndata_size = sizeof(struct iscsi_conn),
+ .max_lun = ISCSI_ISER_MAX_LUN,
+ .max_cmd_len = ISCSI_ISER_MAX_CMD_LEN,
+ /* session management */
+ .create_session = iscsi_iser_session_create,
+ .destroy_session = iscsi_session_teardown,
+ /* connection management */
+ .create_conn = iscsi_iser_conn_create,
+ .bind_conn = iscsi_iser_conn_bind,
+ .destroy_conn = iscsi_iser_conn_destroy,
+ .set_param = iscsi_iser_conn_set_param,
+ .get_conn_param = iscsi_iser_conn_get_param,
+ .get_session_param = iscsi_iser_session_get_param,
+ .start_conn = iscsi_iser_conn_start,
+ .stop_conn = iscsi_conn_stop,
+ /* these are called as part of conn recovery */
+ .suspend_conn_recv = NULL, /* FIXME is/how this relvant to iser? */
+ .terminate_conn = iscsi_iser_conn_terminate,
+ /* IO */
+ .send_pdu = iscsi_conn_send_pdu,
+ .get_stats = iscsi_iser_conn_get_stats,
+ .init_cmd_task = iscsi_iser_cmd_init,
+ .xmit_cmd_task = iscsi_iser_ctask_xmit,
+ .xmit_mgmt_task = iscsi_iser_mtask_xmit,
+ .cleanup_cmd_task = iscsi_iser_cleanup_ctask,
+ /* recovery */
+ .session_recovery_timedout = iscsi_session_recovery_timedout,
+
+ .ep_connect = iscsi_iser_ep_connect,
+ .ep_poll = iscsi_iser_ep_poll,
+ .ep_disconnect = iscsi_iser_ep_disconnect
+};
+
+static int __init iser_init(void)
+{
+ int err;
+
+ iser_dbg("Starting iSER datamover...\n");
+
+ if (iscsi_max_lun < 1) {
+ printk(KERN_ERR "Invalid max_lun value of %u\n", iscsi_max_lun);
+ return -EINVAL;
+ }
+
+ iscsi_iser_transport.max_lun = iscsi_max_lun;
+
+ memset(&ig, 0, sizeof(struct iser_global));
+
+ ig.desc_cache = kmem_cache_create("iser_descriptors",
+ sizeof (struct iser_desc),
+ 0, SLAB_HWCACHE_ALIGN,
+ NULL, NULL);
+ if (ig.desc_cache == NULL)
+ return -ENOMEM;
+
+ /* device init is called only after the first addr resolution */
+ mutex_init(&ig.device_list_mutex);
+ INIT_LIST_HEAD(&ig.device_list);
+ mutex_init(&ig.connlist_mutex);
+ INIT_LIST_HEAD(&ig.connlist);
+
+ if (!iscsi_register_transport(&iscsi_iser_transport)) {
+ iser_err("iscsi_register_transport failed\n");
+ err = -EINVAL;
+ goto register_transport_failure;
+ }
+
+ return 0;
+
+register_transport_failure:
+ kmem_cache_destroy(ig.desc_cache);
+
+ return err;
+}
+
+static void __exit iser_exit(void)
+{
+ iser_dbg("Removing iSER datamover...\n");
+ iscsi_unregister_transport(&iscsi_iser_transport);
+ kmem_cache_destroy(ig.desc_cache);
+}
+
+module_init(iser_init);
+module_exit(iser_exit);
diff --git a/drivers/infiniband/ulp/iser/iscsi_iser.h b/drivers/infiniband/ulp/iser/iscsi_iser.h
new file mode 100644
index 000000000000..3350ba690cfe
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iscsi_iser.h
@@ -0,0 +1,354 @@
+/*
+ * iSER transport for the Open iSCSI Initiator & iSER transport internals
+ *
+ * Copyright (C) 2004 Dmitry Yusupov
+ * Copyright (C) 2004 Alex Aizman
+ * Copyright (C) 2005 Mike Christie
+ * based on code maintained by open-iscsi@googlegroups.com
+ *
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2005, 2006 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: iscsi_iser.h 7051 2006-05-10 12:29:11Z ogerlitz $
+ */
+#ifndef __ISCSI_ISER_H__
+#define __ISCSI_ISER_H__
+
+#include <linux/types.h>
+#include <linux/net.h>
+#include <scsi/libiscsi.h>
+#include <scsi/scsi_transport_iscsi.h>
+
+#include <linux/wait.h>
+#include <linux/sched.h>
+#include <linux/list.h>
+#include <linux/slab.h>
+#include <linux/dma-mapping.h>
+#include <linux/mutex.h>
+#include <linux/mempool.h>
+#include <linux/uio.h>
+
+#include <linux/socket.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+
+#include <rdma/ib_verbs.h>
+#include <rdma/ib_fmr_pool.h>
+#include <rdma/rdma_cm.h>
+
+#define DRV_NAME "iser"
+#define PFX DRV_NAME ": "
+#define DRV_VER "0.1"
+#define DRV_DATE "May 7th, 2006"
+
+#define iser_dbg(fmt, arg...) \
+ do { \
+ if (iser_debug_level > 0) \
+ printk(KERN_DEBUG PFX "%s:" fmt,\
+ __func__ , ## arg); \
+ } while (0)
+
+#define iser_err(fmt, arg...) \
+ do { \
+ printk(KERN_ERR PFX "%s:" fmt, \
+ __func__ , ## arg); \
+ } while (0)
+
+ /* support upto 512KB in one RDMA */
+#define ISCSI_ISER_SG_TABLESIZE (0x80000 >> PAGE_SHIFT)
+#define ISCSI_ISER_MAX_LUN 256
+#define ISCSI_ISER_MAX_CMD_LEN 16
+
+/* QP settings */
+/* Maximal bounds on received asynchronous PDUs */
+#define ISER_MAX_RX_MISC_PDUS 4 /* NOOP_IN(2) , ASYNC_EVENT(2) */
+
+#define ISER_MAX_TX_MISC_PDUS 6 /* NOOP_OUT(2), TEXT(1), *
+ * SCSI_TMFUNC(2), LOGOUT(1) */
+
+#define ISER_QP_MAX_RECV_DTOS (ISCSI_XMIT_CMDS_MAX + \
+ ISER_MAX_RX_MISC_PDUS + \
+ ISER_MAX_TX_MISC_PDUS)
+
+/* the max TX (send) WR supported by the iSER QP is defined by *
+ * max_send_wr = T * (1 + D) + C ; D is how many inflight dataouts we expect *
+ * to have at max for SCSI command. The tx posting & completion handling code *
+ * supports -EAGAIN scheme where tx is suspended till the QP has room for more *
+ * send WR. D=8 comes from 64K/8K */
+
+#define ISER_INFLIGHT_DATAOUTS 8
+
+#define ISER_QP_MAX_REQ_DTOS (ISCSI_XMIT_CMDS_MAX * \
+ (1 + ISER_INFLIGHT_DATAOUTS) + \
+ ISER_MAX_TX_MISC_PDUS + \
+ ISER_MAX_RX_MISC_PDUS)
+
+#define ISER_VER 0x10
+#define ISER_WSV 0x08
+#define ISER_RSV 0x04
+
+struct iser_hdr {
+ u8 flags;
+ u8 rsvd[3];
+ __be32 write_stag; /* write rkey */
+ __be64 write_va;
+ __be32 read_stag; /* read rkey */
+ __be64 read_va;
+} __attribute__((packed));
+
+
+/* Length of an object name string */
+#define ISER_OBJECT_NAME_SIZE 64
+
+enum iser_ib_conn_state {
+ ISER_CONN_INIT, /* descriptor allocd, no conn */
+ ISER_CONN_PENDING, /* in the process of being established */
+ ISER_CONN_UP, /* up and running */
+ ISER_CONN_TERMINATING, /* in the process of being terminated */
+ ISER_CONN_DOWN, /* shut down */
+ ISER_CONN_STATES_NUM
+};
+
+enum iser_task_status {
+ ISER_TASK_STATUS_INIT = 0,
+ ISER_TASK_STATUS_STARTED,
+ ISER_TASK_STATUS_COMPLETED
+};
+
+enum iser_data_dir {
+ ISER_DIR_IN = 0, /* to initiator */
+ ISER_DIR_OUT, /* from initiator */
+ ISER_DIRS_NUM
+};
+
+struct iser_data_buf {
+ void *buf; /* pointer to the sg list */
+ unsigned int size; /* num entries of this sg */
+ unsigned long data_len; /* total data len */
+ unsigned int dma_nents; /* returned by dma_map_sg */
+ char *copy_buf; /* allocated copy buf for SGs unaligned *
+ * for rdma which are copied */
+ struct scatterlist sg_single; /* SG-ified clone of a non SG SC or *
+ * unaligned SG */
+ };
+
+/* fwd declarations */
+struct iser_device;
+struct iscsi_iser_conn;
+struct iscsi_iser_cmd_task;
+
+struct iser_mem_reg {
+ u32 lkey;
+ u32 rkey;
+ u64 va;
+ u64 len;
+ void *mem_h;
+};
+
+struct iser_regd_buf {
+ struct iser_mem_reg reg; /* memory registration info */
+ void *virt_addr;
+ struct iser_device *device; /* device->device for dma_unmap */
+ dma_addr_t dma_addr; /* if non zero, addr for dma_unmap */
+ enum dma_data_direction direction; /* direction for dma_unmap */
+ unsigned int data_size;
+ atomic_t ref_count; /* refcount, freed when dec to 0 */
+};
+
+#define MAX_REGD_BUF_VECTOR_LEN 2
+
+struct iser_dto {
+ struct iscsi_iser_cmd_task *ctask;
+ struct iscsi_iser_conn *conn;
+ int notify_enable;
+
+ /* vector of registered buffers */
+ unsigned int regd_vector_len;
+ struct iser_regd_buf *regd[MAX_REGD_BUF_VECTOR_LEN];
+
+ /* offset into the registered buffer may be specified */
+ unsigned int offset[MAX_REGD_BUF_VECTOR_LEN];
+
+ /* a smaller size may be specified, if 0, then full size is used */
+ unsigned int used_sz[MAX_REGD_BUF_VECTOR_LEN];
+};
+
+enum iser_desc_type {
+ ISCSI_RX,
+ ISCSI_TX_CONTROL ,
+ ISCSI_TX_SCSI_COMMAND,
+ ISCSI_TX_DATAOUT
+};
+
+struct iser_desc {
+ struct iser_hdr iser_header;
+ struct iscsi_hdr iscsi_header;
+ struct iser_regd_buf hdr_regd_buf;
+ void *data; /* used by RX & TX_CONTROL */
+ struct iser_regd_buf data_regd_buf; /* used by RX & TX_CONTROL */
+ enum iser_desc_type type;
+ struct iser_dto dto;
+};
+
+struct iser_device {
+ struct ib_device *ib_device;
+ struct ib_pd *pd;
+ struct ib_cq *cq;
+ struct ib_mr *mr;
+ struct tasklet_struct cq_tasklet;
+ struct list_head ig_list; /* entry in ig devices list */
+ int refcount;
+};
+
+struct iser_conn {
+ struct iscsi_iser_conn *iser_conn; /* iser conn for upcalls */
+ enum iser_ib_conn_state state; /* rdma connection state */
+ spinlock_t lock; /* used for state changes */
+ struct iser_device *device; /* device context */
+ struct rdma_cm_id *cma_id; /* CMA ID */
+ struct ib_qp *qp; /* QP */
+ struct ib_fmr_pool *fmr_pool; /* pool of IB FMRs */
+ int disc_evt_flag; /* disconn event delivered */
+ wait_queue_head_t wait; /* waitq for conn/disconn */
+ atomic_t post_recv_buf_count; /* posted rx count */
+ atomic_t post_send_buf_count; /* posted tx count */
+ struct work_struct comperror_work; /* conn term sleepable ctx*/
+ char name[ISER_OBJECT_NAME_SIZE];
+ struct iser_page_vec *page_vec; /* represents SG to fmr maps*
+ * maps serialized as tx is*/
+ struct list_head conn_list; /* entry in ig conn list */
+};
+
+struct iscsi_iser_conn {
+ struct iscsi_conn *iscsi_conn;/* ptr to iscsi conn */
+ struct iser_conn *ib_conn; /* iSER IB conn */
+
+ rwlock_t lock;
+};
+
+struct iscsi_iser_cmd_task {
+ struct iser_desc desc;
+ struct iscsi_iser_conn *iser_conn;
+ int rdma_data_count;/* RDMA bytes */
+ enum iser_task_status status;
+ int command_sent; /* set if command sent */
+ int dir[ISER_DIRS_NUM]; /* set if dir use*/
+ struct iser_regd_buf rdma_regd[ISER_DIRS_NUM];/* regd rdma buf */
+ struct iser_data_buf data[ISER_DIRS_NUM]; /* orig. data des*/
+ struct iser_data_buf data_copy[ISER_DIRS_NUM];/* contig. copy */
+};
+
+struct iser_page_vec {
+ u64 *pages;
+ int length;
+ int offset;
+ int data_size;
+};
+
+struct iser_global {
+ struct mutex device_list_mutex;/* */
+ struct list_head device_list; /* all iSER devices */
+ struct mutex connlist_mutex;
+ struct list_head connlist; /* all iSER IB connections */
+
+ kmem_cache_t *desc_cache;
+};
+
+extern struct iser_global ig;
+extern int iser_debug_level;
+
+/* allocate connection resources needed for rdma functionality */
+int iser_conn_set_full_featured_mode(struct iscsi_conn *conn);
+
+int iser_send_control(struct iscsi_conn *conn,
+ struct iscsi_mgmt_task *mtask);
+
+int iser_send_command(struct iscsi_conn *conn,
+ struct iscsi_cmd_task *ctask);
+
+int iser_send_data_out(struct iscsi_conn *conn,
+ struct iscsi_cmd_task *ctask,
+ struct iscsi_data *hdr);
+
+void iscsi_iser_recv(struct iscsi_conn *conn,
+ struct iscsi_hdr *hdr,
+ char *rx_data,
+ int rx_data_len);
+
+int iser_conn_init(struct iser_conn **ib_conn);
+
+void iser_conn_terminate(struct iser_conn *ib_conn);
+
+void iser_conn_release(struct iser_conn *ib_conn);
+
+void iser_rcv_completion(struct iser_desc *desc,
+ unsigned long dto_xfer_len);
+
+void iser_snd_completion(struct iser_desc *desc);
+
+void iser_ctask_rdma_init(struct iscsi_iser_cmd_task *ctask);
+
+void iser_ctask_rdma_finalize(struct iscsi_iser_cmd_task *ctask);
+
+void iser_dto_buffs_release(struct iser_dto *dto);
+
+int iser_regd_buff_release(struct iser_regd_buf *regd_buf);
+
+void iser_reg_single(struct iser_device *device,
+ struct iser_regd_buf *regd_buf,
+ enum dma_data_direction direction);
+
+int iser_start_rdma_unaligned_sg(struct iscsi_iser_cmd_task *ctask,
+ enum iser_data_dir cmd_dir);
+
+void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_cmd_task *ctask,
+ enum iser_data_dir cmd_dir);
+
+int iser_reg_rdma_mem(struct iscsi_iser_cmd_task *ctask,
+ enum iser_data_dir cmd_dir);
+
+int iser_connect(struct iser_conn *ib_conn,
+ struct sockaddr_in *src_addr,
+ struct sockaddr_in *dst_addr,
+ int non_blocking);
+
+int iser_reg_page_vec(struct iser_conn *ib_conn,
+ struct iser_page_vec *page_vec,
+ struct iser_mem_reg *mem_reg);
+
+void iser_unreg_mem(struct iser_mem_reg *mem_reg);
+
+int iser_post_recv(struct iser_desc *rx_desc);
+int iser_post_send(struct iser_desc *tx_desc);
+
+int iser_conn_state_comp(struct iser_conn *ib_conn,
+ enum iser_ib_conn_state comp);
+#endif
diff --git a/drivers/infiniband/ulp/iser/iser_initiator.c b/drivers/infiniband/ulp/iser/iser_initiator.c
new file mode 100644
index 000000000000..ccf56f6f7236
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iser_initiator.c
@@ -0,0 +1,738 @@
+/*
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * $Id: iser_initiator.c 6964 2006-05-07 11:11:43Z ogerlitz $
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <asm/io.h>
+#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
+#include <linux/kfifo.h>
+#include <scsi/scsi_cmnd.h>
+#include <scsi/scsi_host.h>
+
+#include "iscsi_iser.h"
+
+/* Constant PDU lengths calculations */
+#define ISER_TOTAL_HEADERS_LEN (sizeof (struct iser_hdr) + \
+ sizeof (struct iscsi_hdr))
+
+/* iser_dto_add_regd_buff - increments the reference count for *
+ * the registered buffer & adds it to the DTO object */
+static void iser_dto_add_regd_buff(struct iser_dto *dto,
+ struct iser_regd_buf *regd_buf,
+ unsigned long use_offset,
+ unsigned long use_size)
+{
+ int add_idx;
+
+ atomic_inc(&regd_buf->ref_count);
+
+ add_idx = dto->regd_vector_len;
+ dto->regd[add_idx] = regd_buf;
+ dto->used_sz[add_idx] = use_size;
+ dto->offset[add_idx] = use_offset;
+
+ dto->regd_vector_len++;
+}
+
+static int iser_dma_map_task_data(struct iscsi_iser_cmd_task *iser_ctask,
+ struct iser_data_buf *data,
+ enum iser_data_dir iser_dir,
+ enum dma_data_direction dma_dir)
+{
+ struct device *dma_device;
+
+ iser_ctask->dir[iser_dir] = 1;
+ dma_device = iser_ctask->iser_conn->ib_conn->device->ib_device->dma_device;
+
+ data->dma_nents = dma_map_sg(dma_device, data->buf, data->size, dma_dir);
+ if (data->dma_nents == 0) {
+ iser_err("dma_map_sg failed!!!\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+static void iser_dma_unmap_task_data(struct iscsi_iser_cmd_task *iser_ctask)
+{
+ struct device *dma_device;
+ struct iser_data_buf *data;
+
+ dma_device = iser_ctask->iser_conn->ib_conn->device->ib_device->dma_device;
+
+ if (iser_ctask->dir[ISER_DIR_IN]) {
+ data = &iser_ctask->data[ISER_DIR_IN];
+ dma_unmap_sg(dma_device, data->buf, data->size, DMA_FROM_DEVICE);
+ }
+
+ if (iser_ctask->dir[ISER_DIR_OUT]) {
+ data = &iser_ctask->data[ISER_DIR_OUT];
+ dma_unmap_sg(dma_device, data->buf, data->size, DMA_TO_DEVICE);
+ }
+}
+
+/* Register user buffer memory and initialize passive rdma
+ * dto descriptor. Total data size is stored in
+ * iser_ctask->data[ISER_DIR_IN].data_len
+ */
+static int iser_prepare_read_cmd(struct iscsi_cmd_task *ctask,
+ unsigned int edtl)
+
+{
+ struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
+ struct iser_regd_buf *regd_buf;
+ int err;
+ struct iser_hdr *hdr = &iser_ctask->desc.iser_header;
+ struct iser_data_buf *buf_in = &iser_ctask->data[ISER_DIR_IN];
+
+ err = iser_dma_map_task_data(iser_ctask,
+ buf_in,
+ ISER_DIR_IN,
+ DMA_FROM_DEVICE);
+ if (err)
+ return err;
+
+ if (edtl > iser_ctask->data[ISER_DIR_IN].data_len) {
+ iser_err("Total data length: %ld, less than EDTL: "
+ "%d, in READ cmd BHS itt: %d, conn: 0x%p\n",
+ iser_ctask->data[ISER_DIR_IN].data_len, edtl,
+ ctask->itt, iser_ctask->iser_conn);
+ return -EINVAL;
+ }
+
+ err = iser_reg_rdma_mem(iser_ctask,ISER_DIR_IN);
+ if (err) {
+ iser_err("Failed to set up Data-IN RDMA\n");
+ return err;
+ }
+ regd_buf = &iser_ctask->rdma_regd[ISER_DIR_IN];
+
+ hdr->flags |= ISER_RSV;
+ hdr->read_stag = cpu_to_be32(regd_buf->reg.rkey);
+ hdr->read_va = cpu_to_be64(regd_buf->reg.va);
+
+ iser_dbg("Cmd itt:%d READ tags RKEY:%#.4X VA:%#llX\n",
+ ctask->itt, regd_buf->reg.rkey,
+ (unsigned long long)regd_buf->reg.va);
+
+ return 0;
+}
+
+/* Register user buffer memory and initialize passive rdma
+ * dto descriptor. Total data size is stored in
+ * ctask->data[ISER_DIR_OUT].data_len
+ */
+static int
+iser_prepare_write_cmd(struct iscsi_cmd_task *ctask,
+ unsigned int imm_sz,
+ unsigned int unsol_sz,
+ unsigned int edtl)
+{
+ struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
+ struct iser_regd_buf *regd_buf;
+ int err;
+ struct iser_dto *send_dto = &iser_ctask->desc.dto;
+ struct iser_hdr *hdr = &iser_ctask->desc.iser_header;
+ struct iser_data_buf *buf_out = &iser_ctask->data[ISER_DIR_OUT];
+
+ err = iser_dma_map_task_data(iser_ctask,
+ buf_out,
+ ISER_DIR_OUT,
+ DMA_TO_DEVICE);
+ if (err)
+ return err;
+
+ if (edtl > iser_ctask->data[ISER_DIR_OUT].data_len) {
+ iser_err("Total data length: %ld, less than EDTL: %d, "
+ "in WRITE cmd BHS itt: %d, conn: 0x%p\n",
+ iser_ctask->data[ISER_DIR_OUT].data_len,
+ edtl, ctask->itt, ctask->conn);
+ return -EINVAL;
+ }
+
+ err = iser_reg_rdma_mem(iser_ctask,ISER_DIR_OUT);
+ if (err != 0) {
+ iser_err("Failed to register write cmd RDMA mem\n");
+ return err;
+ }
+
+ regd_buf = &iser_ctask->rdma_regd[ISER_DIR_OUT];
+
+ if (unsol_sz < edtl) {
+ hdr->flags |= ISER_WSV;
+ hdr->write_stag = cpu_to_be32(regd_buf->reg.rkey);
+ hdr->write_va = cpu_to_be64(regd_buf->reg.va + unsol_sz);
+
+ iser_dbg("Cmd itt:%d, WRITE tags, RKEY:%#.4X "
+ "VA:%#llX + unsol:%d\n",
+ ctask->itt, regd_buf->reg.rkey,
+ (unsigned long long)regd_buf->reg.va, unsol_sz);
+ }
+
+ if (imm_sz > 0) {
+ iser_dbg("Cmd itt:%d, WRITE, adding imm.data sz: %d\n",
+ ctask->itt, imm_sz);
+ iser_dto_add_regd_buff(send_dto,
+ regd_buf,
+ 0,
+ imm_sz);
+ }
+
+ return 0;
+}
+
+/**
+ * iser_post_receive_control - allocates, initializes and posts receive DTO.
+ */
+static int iser_post_receive_control(struct iscsi_conn *conn)
+{
+ struct iscsi_iser_conn *iser_conn = conn->dd_data;
+ struct iser_desc *rx_desc;
+ struct iser_regd_buf *regd_hdr;
+ struct iser_regd_buf *regd_data;
+ struct iser_dto *recv_dto = NULL;
+ struct iser_device *device = iser_conn->ib_conn->device;
+ int rx_data_size, err = 0;
+
+ rx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO);
+ if (rx_desc == NULL) {
+ iser_err("Failed to alloc desc for post recv\n");
+ return -ENOMEM;
+ }
+ rx_desc->type = ISCSI_RX;
+
+ /* for the login sequence we must support rx of upto 8K; login is done
+ * after conn create/bind (connect) and conn stop/bind (reconnect),
+ * what's common for both schemes is that the connection is not started
+ */
+ if (conn->c_stage != ISCSI_CONN_STARTED)
+ rx_data_size = DEFAULT_MAX_RECV_DATA_SEGMENT_LENGTH;
+ else /* FIXME till user space sets conn->max_recv_dlength correctly */
+ rx_data_size = 128;
+
+ rx_desc->data = kmalloc(rx_data_size, GFP_NOIO);
+ if (rx_desc->data == NULL) {
+ iser_err("Failed to alloc data buf for post recv\n");
+ err = -ENOMEM;
+ goto post_rx_kmalloc_failure;
+ }
+
+ recv_dto = &rx_desc->dto;
+ recv_dto->conn = iser_conn;
+ recv_dto->regd_vector_len = 0;
+
+ regd_hdr = &rx_desc->hdr_regd_buf;
+ memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
+ regd_hdr->device = device;
+ regd_hdr->virt_addr = rx_desc; /* == &rx_desc->iser_header */
+ regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN;
+
+ iser_reg_single(device, regd_hdr, DMA_FROM_DEVICE);
+
+ iser_dto_add_regd_buff(recv_dto, regd_hdr, 0, 0);
+
+ regd_data = &rx_desc->data_regd_buf;
+ memset(regd_data, 0, sizeof(struct iser_regd_buf));
+ regd_data->device = device;
+ regd_data->virt_addr = rx_desc->data;
+ regd_data->data_size = rx_data_size;
+
+ iser_reg_single(device, regd_data, DMA_FROM_DEVICE);
+
+ iser_dto_add_regd_buff(recv_dto, regd_data, 0, 0);
+
+ err = iser_post_recv(rx_desc);
+ if (!err)
+ return 0;
+
+ /* iser_post_recv failed */
+ iser_dto_buffs_release(recv_dto);
+ kfree(rx_desc->data);
+post_rx_kmalloc_failure:
+ kmem_cache_free(ig.desc_cache, rx_desc);
+ return err;
+}
+
+/* creates a new tx descriptor and adds header regd buffer */
+static void iser_create_send_desc(struct iscsi_iser_conn *iser_conn,
+ struct iser_desc *tx_desc)
+{
+ struct iser_regd_buf *regd_hdr = &tx_desc->hdr_regd_buf;
+ struct iser_dto *send_dto = &tx_desc->dto;
+
+ memset(regd_hdr, 0, sizeof(struct iser_regd_buf));
+ regd_hdr->device = iser_conn->ib_conn->device;
+ regd_hdr->virt_addr = tx_desc; /* == &tx_desc->iser_header */
+ regd_hdr->data_size = ISER_TOTAL_HEADERS_LEN;
+
+ send_dto->conn = iser_conn;
+ send_dto->notify_enable = 1;
+ send_dto->regd_vector_len = 0;
+
+ memset(&tx_desc->iser_header, 0, sizeof(struct iser_hdr));
+ tx_desc->iser_header.flags = ISER_VER;
+
+ iser_dto_add_regd_buff(send_dto, regd_hdr, 0, 0);
+}
+
+/**
+ * iser_conn_set_full_featured_mode - (iSER API)
+ */
+int iser_conn_set_full_featured_mode(struct iscsi_conn *conn)
+{
+ struct iscsi_iser_conn *iser_conn = conn->dd_data;
+
+ int i;
+ /* no need to keep it in a var, we are after login so if this should
+ * be negotiated, by now the result should be available here */
+ int initial_post_recv_bufs_num = ISER_MAX_RX_MISC_PDUS;
+
+ iser_dbg("Initially post: %d\n", initial_post_recv_bufs_num);
+
+ /* Check that there is no posted recv or send buffers left - */
+ /* they must be consumed during the login phase */
+ BUG_ON(atomic_read(&iser_conn->ib_conn->post_recv_buf_count) != 0);
+ BUG_ON(atomic_read(&iser_conn->ib_conn->post_send_buf_count) != 0);
+
+ /* Initial post receive buffers */
+ for (i = 0; i < initial_post_recv_bufs_num; i++) {
+ if (iser_post_receive_control(conn) != 0) {
+ iser_err("Failed to post recv bufs at:%d conn:0x%p\n",
+ i, conn);
+ return -ENOMEM;
+ }
+ }
+ iser_dbg("Posted %d post recv bufs, conn:0x%p\n", i, conn);
+ return 0;
+}
+
+static int
+iser_check_xmit(struct iscsi_conn *conn, void *task)
+{
+ int rc = 0;
+ struct iscsi_iser_conn *iser_conn = conn->dd_data;
+
+ write_lock_bh(conn->recv_lock);
+ if (atomic_read(&iser_conn->ib_conn->post_send_buf_count) ==
+ ISER_QP_MAX_REQ_DTOS) {
+ iser_dbg("%ld can't xmit task %p, suspending tx\n",jiffies,task);
+ set_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
+ rc = -EAGAIN;
+ }
+ write_unlock_bh(conn->recv_lock);
+ return rc;
+}
+
+
+/**
+ * iser_send_command - send command PDU
+ */
+int iser_send_command(struct iscsi_conn *conn,
+ struct iscsi_cmd_task *ctask)
+{
+ struct iscsi_iser_conn *iser_conn = conn->dd_data;
+ struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
+ struct iser_dto *send_dto = NULL;
+ unsigned long edtl;
+ int err = 0;
+ struct iser_data_buf *data_buf;
+
+ struct iscsi_cmd *hdr = ctask->hdr;
+ struct scsi_cmnd *sc = ctask->sc;
+
+ if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
+ iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
+ return -EPERM;
+ }
+ if (iser_check_xmit(conn, ctask))
+ return -EAGAIN;
+
+ edtl = ntohl(hdr->data_length);
+
+ /* build the tx desc regd header and add it to the tx desc dto */
+ iser_ctask->desc.type = ISCSI_TX_SCSI_COMMAND;
+ send_dto = &iser_ctask->desc.dto;
+ send_dto->ctask = iser_ctask;
+ iser_create_send_desc(iser_conn, &iser_ctask->desc);
+
+ if (hdr->flags & ISCSI_FLAG_CMD_READ)
+ data_buf = &iser_ctask->data[ISER_DIR_IN];
+ else
+ data_buf = &iser_ctask->data[ISER_DIR_OUT];
+
+ if (sc->use_sg) { /* using a scatter list */
+ data_buf->buf = sc->request_buffer;
+ data_buf->size = sc->use_sg;
+ } else if (sc->request_bufflen) {
+ /* using a single buffer - convert it into one entry SG */
+ sg_init_one(&data_buf->sg_single,
+ sc->request_buffer, sc->request_bufflen);
+ data_buf->buf = &data_buf->sg_single;
+ data_buf->size = 1;
+ }
+
+ data_buf->data_len = sc->request_bufflen;
+
+ if (hdr->flags & ISCSI_FLAG_CMD_READ) {
+ err = iser_prepare_read_cmd(ctask, edtl);
+ if (err)
+ goto send_command_error;
+ }
+ if (hdr->flags & ISCSI_FLAG_CMD_WRITE) {
+ err = iser_prepare_write_cmd(ctask,
+ ctask->imm_count,
+ ctask->imm_count +
+ ctask->unsol_count,
+ edtl);
+ if (err)
+ goto send_command_error;
+ }
+
+ iser_reg_single(iser_conn->ib_conn->device,
+ send_dto->regd[0], DMA_TO_DEVICE);
+
+ if (iser_post_receive_control(conn) != 0) {
+ iser_err("post_recv failed!\n");
+ err = -ENOMEM;
+ goto send_command_error;
+ }
+
+ iser_ctask->status = ISER_TASK_STATUS_STARTED;
+
+ err = iser_post_send(&iser_ctask->desc);
+ if (!err)
+ return 0;
+
+send_command_error:
+ iser_dto_buffs_release(send_dto);
+ iser_err("conn %p failed ctask->itt %d err %d\n",conn, ctask->itt, err);
+ return err;
+}
+
+/**
+ * iser_send_data_out - send data out PDU
+ */
+int iser_send_data_out(struct iscsi_conn *conn,
+ struct iscsi_cmd_task *ctask,
+ struct iscsi_data *hdr)
+{
+ struct iscsi_iser_conn *iser_conn = conn->dd_data;
+ struct iscsi_iser_cmd_task *iser_ctask = ctask->dd_data;
+ struct iser_desc *tx_desc = NULL;
+ struct iser_dto *send_dto = NULL;
+ unsigned long buf_offset;
+ unsigned long data_seg_len;
+ unsigned int itt;
+ int err = 0;
+
+ if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
+ iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
+ return -EPERM;
+ }
+
+ if (iser_check_xmit(conn, ctask))
+ return -EAGAIN;
+
+ itt = ntohl(hdr->itt);
+ data_seg_len = ntoh24(hdr->dlength);
+ buf_offset = ntohl(hdr->offset);
+
+ iser_dbg("%s itt %d dseg_len %d offset %d\n",
+ __func__,(int)itt,(int)data_seg_len,(int)buf_offset);
+
+ tx_desc = kmem_cache_alloc(ig.desc_cache, GFP_NOIO);
+ if (tx_desc == NULL) {
+ iser_err("Failed to alloc desc for post dataout\n");
+ return -ENOMEM;
+ }
+
+ tx_desc->type = ISCSI_TX_DATAOUT;
+ memcpy(&tx_desc->iscsi_header, hdr, sizeof(struct iscsi_hdr));
+
+ /* build the tx desc regd header and add it to the tx desc dto */
+ send_dto = &tx_desc->dto;
+ send_dto->ctask = iser_ctask;
+ iser_create_send_desc(iser_conn, tx_desc);
+
+ iser_reg_single(iser_conn->ib_conn->device,
+ send_dto->regd[0], DMA_TO_DEVICE);
+
+ /* all data was registered for RDMA, we can use the lkey */
+ iser_dto_add_regd_buff(send_dto,
+ &iser_ctask->rdma_regd[ISER_DIR_OUT],
+ buf_offset,
+ data_seg_len);
+
+ if (buf_offset + data_seg_len > iser_ctask->data[ISER_DIR_OUT].data_len) {
+ iser_err("Offset:%ld & DSL:%ld in Data-Out "
+ "inconsistent with total len:%ld, itt:%d\n",
+ buf_offset, data_seg_len,
+ iser_ctask->data[ISER_DIR_OUT].data_len, itt);
+ err = -EINVAL;
+ goto send_data_out_error;
+ }
+ iser_dbg("data-out itt: %d, offset: %ld, sz: %ld\n",
+ itt, buf_offset, data_seg_len);
+
+
+ err = iser_post_send(tx_desc);
+ if (!err)
+ return 0;
+
+send_data_out_error:
+ iser_dto_buffs_release(send_dto);
+ kmem_cache_free(ig.desc_cache, tx_desc);
+ iser_err("conn %p failed err %d\n",conn, err);
+ return err;
+}
+
+int iser_send_control(struct iscsi_conn *conn,
+ struct iscsi_mgmt_task *mtask)
+{
+ struct iscsi_iser_conn *iser_conn = conn->dd_data;
+ struct iser_desc *mdesc = mtask->dd_data;
+ struct iser_dto *send_dto = NULL;
+ unsigned int itt;
+ unsigned long data_seg_len;
+ int err = 0;
+ unsigned char opcode;
+ struct iser_regd_buf *regd_buf;
+ struct iser_device *device;
+
+ if (!iser_conn_state_comp(iser_conn->ib_conn, ISER_CONN_UP)) {
+ iser_err("Failed to send, conn: 0x%p is not up\n", iser_conn->ib_conn);
+ return -EPERM;
+ }
+
+ if (iser_check_xmit(conn,mtask))
+ return -EAGAIN;
+
+ /* build the tx desc regd header and add it to the tx desc dto */
+ mdesc->type = ISCSI_TX_CONTROL;
+ send_dto = &mdesc->dto;
+ send_dto->ctask = NULL;
+ iser_create_send_desc(iser_conn, mdesc);
+
+ device = iser_conn->ib_conn->device;
+
+ iser_reg_single(device, send_dto->regd[0], DMA_TO_DEVICE);
+
+ itt = ntohl(mtask->hdr->itt);
+ opcode = mtask->hdr->opcode & ISCSI_OPCODE_MASK;
+ data_seg_len = ntoh24(mtask->hdr->dlength);
+
+ if (data_seg_len > 0) {
+ regd_buf = &mdesc->data_regd_buf;
+ memset(regd_buf, 0, sizeof(struct iser_regd_buf));
+ regd_buf->device = device;
+ regd_buf->virt_addr = mtask->data;
+ regd_buf->data_size = mtask->data_count;
+ iser_reg_single(device, regd_buf,
+ DMA_TO_DEVICE);
+ iser_dto_add_regd_buff(send_dto, regd_buf,
+ 0,
+ data_seg_len);
+ }
+
+ if (iser_post_receive_control(conn) != 0) {
+ iser_err("post_rcv_buff failed!\n");
+ err = -ENOMEM;
+ goto send_control_error;
+ }
+
+ err = iser_post_send(mdesc);
+ if (!err)
+ return 0;
+
+send_control_error:
+ iser_dto_buffs_release(send_dto);
+ iser_err("conn %p failed err %d\n",conn, err);
+ return err;
+}
+
+/**
+ * iser_rcv_dto_completion - recv DTO completion
+ */
+void iser_rcv_completion(struct iser_desc *rx_desc,
+ unsigned long dto_xfer_len)
+{
+ struct iser_dto *dto = &rx_desc->dto;
+ struct iscsi_iser_conn *conn = dto->conn;
+ struct iscsi_session *session = conn->iscsi_conn->session;
+ struct iscsi_cmd_task *ctask;
+ struct iscsi_iser_cmd_task *iser_ctask;
+ struct iscsi_hdr *hdr;
+ char *rx_data = NULL;
+ int rx_data_len = 0;
+ unsigned int itt;
+ unsigned char opcode;
+
+ hdr = &rx_desc->iscsi_header;
+
+ iser_dbg("op 0x%x itt 0x%x\n", hdr->opcode,hdr->itt);
+
+ if (dto_xfer_len > ISER_TOTAL_HEADERS_LEN) { /* we have data */
+ rx_data_len = dto_xfer_len - ISER_TOTAL_HEADERS_LEN;
+ rx_data = dto->regd[1]->virt_addr;
+ rx_data += dto->offset[1];
+ }
+
+ opcode = hdr->opcode & ISCSI_OPCODE_MASK;
+
+ if (opcode == ISCSI_OP_SCSI_CMD_RSP) {
+ itt = hdr->itt & ISCSI_ITT_MASK; /* mask out cid and age bits */
+ if (!(itt < session->cmds_max))
+ iser_err("itt can't be matched to task!!!"
+ "conn %p opcode %d cmds_max %d itt %d\n",
+ conn->iscsi_conn,opcode,session->cmds_max,itt);
+ /* use the mapping given with the cmds array indexed by itt */
+ ctask = (struct iscsi_cmd_task *)session->cmds[itt];
+ iser_ctask = ctask->dd_data;
+ iser_dbg("itt %d ctask %p\n",itt,ctask);
+ iser_ctask->status = ISER_TASK_STATUS_COMPLETED;
+ iser_ctask_rdma_finalize(iser_ctask);
+ }
+
+ iser_dto_buffs_release(dto);
+
+ iscsi_iser_recv(conn->iscsi_conn, hdr, rx_data, rx_data_len);
+
+ kfree(rx_desc->data);
+ kmem_cache_free(ig.desc_cache, rx_desc);
+
+ /* decrementing conn->post_recv_buf_count only --after-- freeing the *
+ * task eliminates the need to worry on tasks which are completed in *
+ * parallel to the execution of iser_conn_term. So the code that waits *
+ * for the posted rx bufs refcount to become zero handles everything */
+ atomic_dec(&conn->ib_conn->post_recv_buf_count);
+}
+
+void iser_snd_completion(struct iser_desc *tx_desc)
+{
+ struct iser_dto *dto = &tx_desc->dto;
+ struct iscsi_iser_conn *iser_conn = dto->conn;
+ struct iscsi_conn *conn = iser_conn->iscsi_conn;
+ struct iscsi_mgmt_task *mtask;
+
+ iser_dbg("Initiator, Data sent dto=0x%p\n", dto);
+
+ iser_dto_buffs_release(dto);
+
+ if (tx_desc->type == ISCSI_TX_DATAOUT)
+ kmem_cache_free(ig.desc_cache, tx_desc);
+
+ atomic_dec(&iser_conn->ib_conn->post_send_buf_count);
+
+ write_lock(conn->recv_lock);
+ if (conn->suspend_tx) {
+ iser_dbg("%ld resuming tx\n",jiffies);
+ clear_bit(ISCSI_SUSPEND_BIT, &conn->suspend_tx);
+ scsi_queue_work(conn->session->host, &conn->xmitwork);
+ }
+ write_unlock(conn->recv_lock);
+
+ if (tx_desc->type == ISCSI_TX_CONTROL) {
+ /* this arithmetic is legal by libiscsi dd_data allocation */
+ mtask = (void *) ((long)(void *)tx_desc -
+ sizeof(struct iscsi_mgmt_task));
+ if (mtask->hdr->itt == cpu_to_be32(ISCSI_RESERVED_TAG)) {
+ struct iscsi_session *session = conn->session;
+
+ spin_lock(&conn->session->lock);
+ list_del(&mtask->running);
+ __kfifo_put(session->mgmtpool.queue, (void*)&mtask,
+ sizeof(void*));
+ spin_unlock(&session->lock);
+ }
+ }
+}
+
+void iser_ctask_rdma_init(struct iscsi_iser_cmd_task *iser_ctask)
+
+{
+ iser_ctask->status = ISER_TASK_STATUS_INIT;
+
+ iser_ctask->dir[ISER_DIR_IN] = 0;
+ iser_ctask->dir[ISER_DIR_OUT] = 0;
+
+ iser_ctask->data[ISER_DIR_IN].data_len = 0;
+ iser_ctask->data[ISER_DIR_OUT].data_len = 0;
+
+ memset(&iser_ctask->rdma_regd[ISER_DIR_IN], 0,
+ sizeof(struct iser_regd_buf));
+ memset(&iser_ctask->rdma_regd[ISER_DIR_OUT], 0,
+ sizeof(struct iser_regd_buf));
+}
+
+void iser_ctask_rdma_finalize(struct iscsi_iser_cmd_task *iser_ctask)
+{
+ int deferred;
+
+ /* if we were reading, copy back to unaligned sglist,
+ * anyway dma_unmap and free the copy
+ */
+ if (iser_ctask->data_copy[ISER_DIR_IN].copy_buf != NULL)
+ iser_finalize_rdma_unaligned_sg(iser_ctask, ISER_DIR_IN);
+ if (iser_ctask->data_copy[ISER_DIR_OUT].copy_buf != NULL)
+ iser_finalize_rdma_unaligned_sg(iser_ctask, ISER_DIR_OUT);
+
+ if (iser_ctask->dir[ISER_DIR_IN]) {
+ deferred = iser_regd_buff_release
+ (&iser_ctask->rdma_regd[ISER_DIR_IN]);
+ if (deferred) {
+ iser_err("References remain for BUF-IN rdma reg\n");
+ BUG();
+ }
+ }
+
+ if (iser_ctask->dir[ISER_DIR_OUT]) {
+ deferred = iser_regd_buff_release
+ (&iser_ctask->rdma_regd[ISER_DIR_OUT]);
+ if (deferred) {
+ iser_err("References remain for BUF-OUT rdma reg\n");
+ BUG();
+ }
+ }
+
+ iser_dma_unmap_task_data(iser_ctask);
+}
+
+void iser_dto_buffs_release(struct iser_dto *dto)
+{
+ int i;
+
+ for (i = 0; i < dto->regd_vector_len; i++)
+ iser_regd_buff_release(dto->regd[i]);
+}
+
diff --git a/drivers/infiniband/ulp/iser/iser_memory.c b/drivers/infiniband/ulp/iser/iser_memory.c
new file mode 100644
index 000000000000..31950a522a1c
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iser_memory.c
@@ -0,0 +1,401 @@
+/*
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses. You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * OpenIB.org BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or
+ * without modification, are permitted provided that the following
+ * conditions are met:
+ *
+ * - Redistributions of source code must retain the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer.
+ *
+ * - Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following
+ * disclaimer in the documentation and/or other materials
+ * provided with the distribution.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ *
+ * $Id: iser_memory.c 6964 2006-05-07 11:11:43Z ogerlitz $
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mm.h>
+#include <asm/io.h>
+#include <asm/scatterlist.h>
+#include <linux/scatterlist.h>
+
+#include "iscsi_iser.h"
+
+#define ISER_KMALLOC_THRESHOLD 0x20000 /* 128K - kmalloc limit */
+/**
+ * Decrements the reference count for the
+ * registered buffer & releases it
+ *
+ * returns 0 if released, 1 if deferred
+ */
+int iser_regd_buff_release(struct iser_regd_buf *regd_buf)
+{
+ struct device *dma_device;
+
+ if ((atomic_read(&regd_buf->ref_count) == 0) ||
+ atomic_dec_and_test(&regd_buf->ref_count)) {
+ /* if we used the dma mr, unreg is just NOP */
+ if (regd_buf->reg.rkey != 0)
+ iser_unreg_mem(&regd_buf->reg);
+
+ if (regd_buf->dma_addr) {
+ dma_device = regd_buf->device->ib_device->dma_device;
+ dma_unmap_single(dma_device,
+ regd_buf->dma_addr,
+ regd_buf->data_size,
+ regd_buf->direction);
+ }
+ /* else this regd buf is associated with task which we */
+ /* dma_unmap_single/sg later */
+ return 0;
+ } else {
+ iser_dbg("Release deferred, regd.buff: 0x%p\n", regd_buf);
+ return 1;
+ }
+}
+
+/**
+ * iser_reg_single - fills registered buffer descriptor with
+ * registration information
+ */
+void iser_reg_single(struct iser_device *device,
+ struct iser_regd_buf *regd_buf,
+ enum dma_data_direction direction)
+{
+ dma_addr_t dma_addr;
+
+ dma_addr = dma_map_single(device->ib_device->dma_device,
+ regd_buf->virt_addr,
+ regd_buf->data_size, direction);
+ BUG_ON(dma_mapping_error(dma_addr));
+
+ regd_buf->reg.lkey = device->mr->lkey;
+ regd_buf->reg.rkey = 0; /* indicate there's no need to unreg */
+ regd_buf->reg.len = regd_buf->data_size;
+ regd_buf->reg.va = dma_addr;
+
+ regd_buf->dma_addr = dma_addr;
+ regd_buf->direction = direction;
+}
+
+/**
+ * iser_start_rdma_unaligned_sg
+ */
+int iser_start_rdma_unaligned_sg(struct iscsi_iser_cmd_task *iser_ctask,
+ enum iser_data_dir cmd_dir)
+{
+ int dma_nents;
+ struct device *dma_device;
+ char *mem = NULL;
+ struct iser_data_buf *data = &iser_ctask->data[cmd_dir];
+ unsigned long cmd_data_len = data->data_len;
+
+ if (cmd_data_len > ISER_KMALLOC_THRESHOLD)
+ mem = (void *)__get_free_pages(GFP_NOIO,
+ long_log2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT);
+ else
+ mem = kmalloc(cmd_data_len, GFP_NOIO);
+
+ if (mem == NULL) {
+ iser_err("Failed to allocate mem size %d %d for copying sglist\n",
+ data->size,(int)cmd_data_len);
+ return -ENOMEM;
+ }
+
+ if (cmd_dir == ISER_DIR_OUT) {
+ /* copy the unaligned sg the buffer which is used for RDMA */
+ struct scatterlist *sg = (struct scatterlist *)data->buf;
+ int i;
+ char *p, *from;
+
+ for (p = mem, i = 0; i < data->size; i++) {
+ from = kmap_atomic(sg[i].page, KM_USER0);
+ memcpy(p,
+ from + sg[i].offset,
+ sg[i].length);
+ kunmap_atomic(from, KM_USER0);
+ p += sg[i].length;
+ }
+ }
+
+ sg_init_one(&iser_ctask->data_copy[cmd_dir].sg_single, mem, cmd_data_len);
+ iser_ctask->data_copy[cmd_dir].buf =
+ &iser_ctask->data_copy[cmd_dir].sg_single;
+ iser_ctask->data_copy[cmd_dir].size = 1;
+
+ iser_ctask->data_copy[cmd_dir].copy_buf = mem;
+
+ dma_device = iser_ctask->iser_conn->ib_conn->device->ib_device->dma_device;
+
+ if (cmd_dir == ISER_DIR_OUT)
+ dma_nents = dma_map_sg(dma_device,
+ &iser_ctask->data_copy[cmd_dir].sg_single,
+ 1, DMA_TO_DEVICE);
+ else
+ dma_nents = dma_map_sg(dma_device,
+ &iser_ctask->data_copy[cmd_dir].sg_single,
+ 1, DMA_FROM_DEVICE);
+
+ BUG_ON(dma_nents == 0);
+
+ iser_ctask->data_copy[cmd_dir].dma_nents = dma_nents;
+ return 0;
+}
+
+/**
+ * iser_finalize_rdma_unaligned_sg
+ */
+void iser_finalize_rdma_unaligned_sg(struct iscsi_iser_cmd_task *iser_ctask,
+ enum iser_data_dir cmd_dir)
+{
+ struct device *dma_device;
+ struct iser_data_buf *mem_copy;
+ unsigned long cmd_data_len;
+
+ dma_device = iser_ctask->iser_conn->ib_conn->device->ib_device->dma_device;
+ mem_copy = &iser_ctask->data_copy[cmd_dir];
+
+ if (cmd_dir == ISER_DIR_OUT)
+ dma_unmap_sg(dma_device, &mem_copy->sg_single, 1,
+ DMA_TO_DEVICE);
+ else
+ dma_unmap_sg(dma_device, &mem_copy->sg_single, 1,
+ DMA_FROM_DEVICE);
+
+ if (cmd_dir == ISER_DIR_IN) {
+ char *mem;
+ struct scatterlist *sg;
+ unsigned char *p, *to;
+ unsigned int sg_size;
+ int i;
+
+ /* copy back read RDMA to unaligned sg */
+ mem = mem_copy->copy_buf;
+
+ sg = (struct scatterlist *)iser_ctask->data[ISER_DIR_IN].buf;
+ sg_size = iser_ctask->data[ISER_DIR_IN].size;
+
+ for (p = mem, i = 0; i < sg_size; i++){
+ to = kmap_atomic(sg[i].page, KM_SOFTIRQ0);
+ memcpy(to + sg[i].offset,
+ p,
+ sg[i].length);
+ kunmap_atomic(to, KM_SOFTIRQ0);
+ p += sg[i].length;
+ }
+ }
+
+ cmd_data_len = iser_ctask->data[cmd_dir].data_len;
+
+ if (cmd_data_len > ISER_KMALLOC_THRESHOLD)
+ free_pages((unsigned long)mem_copy->copy_buf,
+ long_log2(roundup_pow_of_two(cmd_data_len)) - PAGE_SHIFT);
+ else
+ kfree(mem_copy->copy_buf);
+
+ mem_copy->copy_buf = NULL;
+}
+
+/**
+ * iser_sg_to_page_vec - Translates scatterlist entries to physical addresses
+ * and returns the length of resulting physical address array (may be less than
+ * the original due to possible compaction).
+ *
+ * we build a "page vec" under the assumption that the SG meets the RDMA
+ * alignment requirements. Other then the first and last SG elements, all
+ * the "internal" elements can be compacted into a list whose elements are
+ * dma addresses of physical pages. The code supports also the weird case
+ * where --few fragments of the same page-- are present in the SG as
+ * consecutive elements. Also, it handles one entry SG.
+ */
+static int iser_sg_to_page_vec(struct iser_data_buf *data,
+ struct iser_page_vec *page_vec)
+{
+ struct scatterlist *sg = (struct scatterlist *)data->buf;
+ dma_addr_t first_addr, last_addr, page;
+ int start_aligned, end_aligned;
+ unsigned int cur_page = 0;
+ unsigned long total_sz = 0;
+ int i;
+
+ /* compute the offset of first element */
+ page_vec->offset = (u64) sg[0].offset;
+
+ for (i = 0; i < data->dma_nents; i++) {
+ total_sz += sg_dma_len(&sg[i]);
+
+ first_addr = sg_dma_address(&sg[i]);
+ last_addr = first_addr + sg_dma_len(&sg[i]);
+
+ start_aligned = !(first_addr & ~PAGE_MASK);
+ end_aligned = !(last_addr & ~PAGE_MASK);
+
+ /* continue to collect page fragments till aligned or SG ends */
+ while (!end_aligned && (i + 1 < data->dma_nents)) {
+ i++;
+ total_sz += sg_dma_len(&sg[i]);
+ last_addr = sg_dma_address(&sg[i]) + sg_dma_len(&sg[i]);
+ end_aligned = !(last_addr & ~PAGE_MASK);
+ }
+
+ first_addr = first_addr & PAGE_MASK;
+
+ for (page = first_addr; page < last_addr; page += PAGE_SIZE)
+ page_vec->pages[cur_page++] = page;
+
+ }
+ page_vec->data_size = total_sz;
+ iser_dbg("page_vec->data_size:%d cur_page %d\n", page_vec->data_size,cur_page);
+ return cur_page;
+}
+
+#define MASK_4K ((1UL << 12) - 1) /* 0xFFF */
+#define IS_4K_ALIGNED(addr) ((((unsigned long)addr) & MASK_4K) == 0)
+
+/**
+ * iser_data_buf_aligned_len - Tries to determine the maximal correctly aligned
+ * for RDMA sub-list of a scatter-gather list of memory buffers, and returns
+ * the number of entries which are aligned correctly. Supports the case where
+ * consecutive SG elements are actually fragments of the same physcial page.
+ */
+static unsigned int iser_data_buf_aligned_len(struct iser_data_buf *data)
+{
+ struct scatterlist *sg;
+ dma_addr_t end_addr, next_addr;
+ int i, cnt;
+ unsigned int ret_len = 0;
+
+ sg = (struct scatterlist *)data->buf;
+
+ for (cnt = 0, i = 0; i < data->dma_nents; i++, cnt++) {
+ /* iser_dbg("Checking sg iobuf [%d]: phys=0x%08lX "
+ "offset: %ld sz: %ld\n", i,
+ (unsigned long)page_to_phys(sg[i].page),
+ (unsigned long)sg[i].offset,
+ (unsigned long)sg[i].length); */
+ end_addr = sg_dma_address(&sg[i]) +
+ sg_dma_len(&sg[i]);
+ /* iser_dbg("Checking sg iobuf end address "
+ "0x%08lX\n", end_addr); */
+ if (i + 1 < data->dma_nents) {
+ next_addr = sg_dma_address(&sg[i+1]);
+ /* are i, i+1 fragments of the same page? */
+ if (end_addr == next_addr)
+ continue;
+ else if (!IS_4K_ALIGNED(end_addr)) {
+ ret_len = cnt + 1;
+ break;
+ }
+ }
+ }
+ if (i == data->dma_nents)
+ ret_len = cnt; /* loop ended */
+ iser_dbg("Found %d aligned entries out of %d in sg:0x%p\n",
+ ret_len, data->dma_nents, data);
+ return ret_len;
+}
+
+static void iser_data_buf_dump(struct iser_data_buf *data)
+{
+ struct scatterlist *sg = (struct scatterlist *)data->buf;
+ int i;
+
+ for (i = 0; i < data->size; i++)
+ iser_err("sg[%d] dma_addr:0x%lX page:0x%p "
+ "off:%d sz:%d dma_len:%d\n",
+ i, (unsigned long)sg_dma_address(&sg[i]),
+ sg[i].page, sg[i].offset,
+ sg[i].length,sg_dma_len(&sg[i]));
+}
+
+static void iser_dump_page_vec(struct iser_page_vec *page_vec)
+{
+ int i;
+
+ iser_err("page vec length %d data size %d\n",
+ page_vec->length, page_vec->data_size);
+ for (i = 0; i < page_vec->length; i++)
+ iser_err("%d %lx\n",i,(unsigned long)page_vec->pages[i]);
+}
+
+static void iser_page_vec_build(struct iser_data_buf *data,
+ struct iser_page_vec *page_vec)
+{
+ int page_vec_len = 0;
+
+ page_vec->length = 0;
+ page_vec->offset = 0;
+
+ iser_dbg("Translating sg sz: %d\n", data->dma_nents);
+ page_vec_len = iser_sg_to_page_vec(data,page_vec);
+ iser_dbg("sg len %d page_vec_len %d\n", data->dma_nents,page_vec_len);
+
+ page_vec->length = page_vec_len;
+
+ if (page_vec_len * PAGE_SIZE < page_vec->data_size) {
+ iser_err("page_vec too short to hold this SG\n");
+ iser_data_buf_dump(data);
+ iser_dump_page_vec(page_vec);
+ BUG();
+ }
+}
+
+/**
+ * iser_reg_rdma_mem - Registers memory intended for RDMA,
+ * obtaining rkey and va
+ *
+ * returns 0 on success, errno code on failure
+ */
+int iser_reg_rdma_mem(struct iscsi_iser_cmd_task *iser_ctask,
+ enum iser_data_dir cmd_dir)
+{
+ struct iser_conn *ib_conn = iser_ctask->iser_conn->ib_conn;
+ struct iser_data_buf *mem = &iser_ctask->data[cmd_dir];
+ struct iser_regd_buf *regd_buf;
+ int aligned_len;
+ int err;
+
+ regd_buf = &iser_ctask->rdma_regd[cmd_dir];
+
+ aligned_len = iser_data_buf_aligned_len(mem);
+ if (aligned_len != mem->size) {
+ iser_err("rdma alignment violation %d/%d aligned\n",
+ aligned_len, mem->size);
+ iser_data_buf_dump(mem);
+ /* allocate copy buf, if we are writing, copy the */
+ /* unaligned scatterlist, dma map the copy */
+ if (iser_start_rdma_unaligned_sg(iser_ctask, cmd_dir) != 0)
+ return -ENOMEM;
+ mem = &iser_ctask->data_copy[cmd_dir];
+ }
+
+ iser_page_vec_build(mem, ib_conn->page_vec);
+ err = iser_reg_page_vec(ib_conn, ib_conn->page_vec, &regd_buf->reg);
+ if (err)
+ return err;
+
+ /* take a reference on this regd buf such that it will not be released *
+ * (eg in send dto completion) before we get the scsi response */
+ atomic_inc(&regd_buf->ref_count);
+ return 0;
+}
diff --git a/drivers/infiniband/ulp/iser/iser_verbs.c b/drivers/infiniband/ulp/iser/iser_verbs.c
new file mode 100644
index 000000000000..ff117bbf81b4
--- /dev/null
+++ b/drivers/infiniband/ulp/iser/iser_verbs.c
@@ -0,0 +1,827 @@
+/*
+ * Copyright (c) 2004, 2005, 2006 Voltaire, Inc. All rights reserved.
+ * Copyright (c) 2005, 2006 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: iser_verbs.c 7051 2006-05-10 12:29:11Z ogerlitz $
+ */
+#include <asm/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/smp_lock.h>
+#include <linux/delay.h>
+#include <linux/version.h>
+
+#include "iscsi_iser.h"
+
+#define ISCSI_ISER_MAX_CONN 8
+#define ISER_MAX_CQ_LEN ((ISER_QP_MAX_RECV_DTOS + \
+ ISER_QP_MAX_REQ_DTOS) * \
+ ISCSI_ISER_MAX_CONN)
+
+static void iser_cq_tasklet_fn(unsigned long data);
+static void iser_cq_callback(struct ib_cq *cq, void *cq_context);
+static void iser_comp_error_worker(void *data);
+
+static void iser_cq_event_callback(struct ib_event *cause, void *context)
+{
+ iser_err("got cq event %d \n", cause->event);
+}
+
+static void iser_qp_event_callback(struct ib_event *cause, void *context)
+{
+ iser_err("got qp event %d\n",cause->event);
+}
+
+/**
+ * iser_create_device_ib_res - creates Protection Domain (PD), Completion
+ * Queue (CQ), DMA Memory Region (DMA MR) with the device associated with
+ * the adapator.
+ *
+ * returns 0 on success, -1 on failure
+ */
+static int iser_create_device_ib_res(struct iser_device *device)
+{
+ device->pd = ib_alloc_pd(device->ib_device);
+ if (IS_ERR(device->pd))
+ goto pd_err;
+
+ device->cq = ib_create_cq(device->ib_device,
+ iser_cq_callback,
+ iser_cq_event_callback,
+ (void *)device,
+ ISER_MAX_CQ_LEN);
+ if (IS_ERR(device->cq))
+ goto cq_err;
+
+ if (ib_req_notify_cq(device->cq, IB_CQ_NEXT_COMP))
+ goto cq_arm_err;
+
+ tasklet_init(&device->cq_tasklet,
+ iser_cq_tasklet_fn,
+ (unsigned long)device);
+
+ device->mr = ib_get_dma_mr(device->pd,
+ IB_ACCESS_LOCAL_WRITE);
+ if (IS_ERR(device->mr))
+ goto dma_mr_err;
+
+ return 0;
+
+dma_mr_err:
+ tasklet_kill(&device->cq_tasklet);
+cq_arm_err:
+ ib_destroy_cq(device->cq);
+cq_err:
+ ib_dealloc_pd(device->pd);
+pd_err:
+ iser_err("failed to allocate an IB resource\n");
+ return -1;
+}
+
+/**
+ * iser_free_device_ib_res - destory/dealloc/dereg the DMA MR,
+ * CQ and PD created with the device associated with the adapator.
+ */
+static void iser_free_device_ib_res(struct iser_device *device)
+{
+ BUG_ON(device->mr == NULL);
+
+ tasklet_kill(&device->cq_tasklet);
+
+ (void)ib_dereg_mr(device->mr);
+ (void)ib_destroy_cq(device->cq);
+ (void)ib_dealloc_pd(device->pd);
+
+ device->mr = NULL;
+ device->cq = NULL;
+ device->pd = NULL;
+}
+
+/**
+ * iser_create_ib_conn_res - Creates FMR pool and Queue-Pair (QP)
+ *
+ * returns 0 on success, -1 on failure
+ */
+static int iser_create_ib_conn_res(struct iser_conn *ib_conn)
+{
+ struct iser_device *device;
+ struct ib_qp_init_attr init_attr;
+ int ret;
+ struct ib_fmr_pool_param params;
+
+ BUG_ON(ib_conn->device == NULL);
+
+ device = ib_conn->device;
+
+ ib_conn->page_vec = kmalloc(sizeof(struct iser_page_vec) +
+ (sizeof(u64) * (ISCSI_ISER_SG_TABLESIZE +1)),
+ GFP_KERNEL);
+ if (!ib_conn->page_vec) {
+ ret = -ENOMEM;
+ goto alloc_err;
+ }
+ ib_conn->page_vec->pages = (u64 *) (ib_conn->page_vec + 1);
+
+ params.page_shift = PAGE_SHIFT;
+ /* when the first/last SG element are not start/end *
+ * page aligned, the map whould be of N+1 pages */
+ params.max_pages_per_fmr = ISCSI_ISER_SG_TABLESIZE + 1;
+ /* make the pool size twice the max number of SCSI commands *
+ * the ML is expected to queue, watermark for unmap at 50% */
+ params.pool_size = ISCSI_XMIT_CMDS_MAX * 2;
+ params.dirty_watermark = ISCSI_XMIT_CMDS_MAX;
+ params.cache = 0;
+ params.flush_function = NULL;
+ params.access = (IB_ACCESS_LOCAL_WRITE |
+ IB_ACCESS_REMOTE_WRITE |
+ IB_ACCESS_REMOTE_READ);
+
+ ib_conn->fmr_pool = ib_create_fmr_pool(device->pd, &params);
+ if (IS_ERR(ib_conn->fmr_pool)) {
+ ret = PTR_ERR(ib_conn->fmr_pool);
+ goto fmr_pool_err;
+ }
+
+ memset(&init_attr, 0, sizeof init_attr);
+
+ init_attr.event_handler = iser_qp_event_callback;
+ init_attr.qp_context = (void *)ib_conn;
+ init_attr.send_cq = device->cq;
+ init_attr.recv_cq = device->cq;
+ init_attr.cap.max_send_wr = ISER_QP_MAX_REQ_DTOS;
+ init_attr.cap.max_recv_wr = ISER_QP_MAX_RECV_DTOS;
+ init_attr.cap.max_send_sge = MAX_REGD_BUF_VECTOR_LEN;
+ init_attr.cap.max_recv_sge = 2;
+ init_attr.sq_sig_type = IB_SIGNAL_REQ_WR;
+ init_attr.qp_type = IB_QPT_RC;
+
+ ret = rdma_create_qp(ib_conn->cma_id, device->pd, &init_attr);
+ if (ret)
+ goto qp_err;
+
+ ib_conn->qp = ib_conn->cma_id->qp;
+ iser_err("setting conn %p cma_id %p: fmr_pool %p qp %p\n",
+ ib_conn, ib_conn->cma_id,
+ ib_conn->fmr_pool, ib_conn->cma_id->qp);
+ return ret;
+
+qp_err:
+ (void)ib_destroy_fmr_pool(ib_conn->fmr_pool);
+fmr_pool_err:
+ kfree(ib_conn->page_vec);
+alloc_err:
+ iser_err("unable to alloc mem or create resource, err %d\n", ret);
+ return ret;
+}
+
+/**
+ * releases the FMR pool, QP and CMA ID objects, returns 0 on success,
+ * -1 on failure
+ */
+static int iser_free_ib_conn_res(struct iser_conn *ib_conn)
+{
+ BUG_ON(ib_conn == NULL);
+
+ iser_err("freeing conn %p cma_id %p fmr pool %p qp %p\n",
+ ib_conn, ib_conn->cma_id,
+ ib_conn->fmr_pool, ib_conn->qp);
+
+ /* qp is created only once both addr & route are resolved */
+ if (ib_conn->fmr_pool != NULL)
+ ib_destroy_fmr_pool(ib_conn->fmr_pool);
+
+ if (ib_conn->qp != NULL)
+ rdma_destroy_qp(ib_conn->cma_id);
+
+ if (ib_conn->cma_id != NULL)
+ rdma_destroy_id(ib_conn->cma_id);
+
+ ib_conn->fmr_pool = NULL;
+ ib_conn->qp = NULL;
+ ib_conn->cma_id = NULL;
+ kfree(ib_conn->page_vec);
+
+ return 0;
+}
+
+/**
+ * based on the resolved device node GUID see if there already allocated
+ * device for this device. If there's no such, create one.
+ */
+static
+struct iser_device *iser_device_find_by_ib_device(struct rdma_cm_id *cma_id)
+{
+ struct list_head *p_list;
+ struct iser_device *device = NULL;
+
+ mutex_lock(&ig.device_list_mutex);
+
+ p_list = ig.device_list.next;
+ while (p_list != &ig.device_list) {
+ device = list_entry(p_list, struct iser_device, ig_list);
+ /* find if there's a match using the node GUID */
+ if (device->ib_device->node_guid == cma_id->device->node_guid)
+ break;
+ }
+
+ if (device == NULL) {
+ device = kzalloc(sizeof *device, GFP_KERNEL);
+ if (device == NULL)
+ goto out;
+ /* assign this device to the device */
+ device->ib_device = cma_id->device;
+ /* init the device and link it into ig device list */
+ if (iser_create_device_ib_res(device)) {
+ kfree(device);
+ device = NULL;
+ goto out;
+ }
+ list_add(&device->ig_list, &ig.device_list);
+ }
+out:
+ BUG_ON(device == NULL);
+ device->refcount++;
+ mutex_unlock(&ig.device_list_mutex);
+ return device;
+}
+
+/* if there's no demand for this device, release it */
+static void iser_device_try_release(struct iser_device *device)
+{
+ mutex_lock(&ig.device_list_mutex);
+ device->refcount--;
+ iser_err("device %p refcount %d\n",device,device->refcount);
+ if (!device->refcount) {
+ iser_free_device_ib_res(device);
+ list_del(&device->ig_list);
+ kfree(device);
+ }
+ mutex_unlock(&ig.device_list_mutex);
+}
+
+int iser_conn_state_comp(struct iser_conn *ib_conn,
+ enum iser_ib_conn_state comp)
+{
+ int ret;
+
+ spin_lock_bh(&ib_conn->lock);
+ ret = (ib_conn->state == comp);
+ spin_unlock_bh(&ib_conn->lock);
+ return ret;
+}
+
+static int iser_conn_state_comp_exch(struct iser_conn *ib_conn,
+ enum iser_ib_conn_state comp,
+ enum iser_ib_conn_state exch)
+{
+ int ret;
+
+ spin_lock_bh(&ib_conn->lock);
+ if ((ret = (ib_conn->state == comp)))
+ ib_conn->state = exch;
+ spin_unlock_bh(&ib_conn->lock);
+ return ret;
+}
+
+/**
+ * triggers start of the disconnect procedures and wait for them to be done
+ */
+void iser_conn_terminate(struct iser_conn *ib_conn)
+{
+ int err = 0;
+
+ /* change the ib conn state only if the conn is UP, however always call
+ * rdma_disconnect since this is the only way to cause the CMA to change
+ * the QP state to ERROR
+ */
+
+ iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP, ISER_CONN_TERMINATING);
+ err = rdma_disconnect(ib_conn->cma_id);
+ if (err)
+ iser_err("Failed to disconnect, conn: 0x%p err %d\n",
+ ib_conn,err);
+
+ wait_event_interruptible(ib_conn->wait,
+ ib_conn->state == ISER_CONN_DOWN);
+
+ iser_conn_release(ib_conn);
+}
+
+static void iser_connect_error(struct rdma_cm_id *cma_id)
+{
+ struct iser_conn *ib_conn;
+ ib_conn = (struct iser_conn *)cma_id->context;
+
+ ib_conn->state = ISER_CONN_DOWN;
+ wake_up_interruptible(&ib_conn->wait);
+}
+
+static void iser_addr_handler(struct rdma_cm_id *cma_id)
+{
+ struct iser_device *device;
+ struct iser_conn *ib_conn;
+ int ret;
+
+ device = iser_device_find_by_ib_device(cma_id);
+ ib_conn = (struct iser_conn *)cma_id->context;
+ ib_conn->device = device;
+
+ ret = rdma_resolve_route(cma_id, 1000);
+ if (ret) {
+ iser_err("resolve route failed: %d\n", ret);
+ iser_connect_error(cma_id);
+ }
+ return;
+}
+
+static void iser_route_handler(struct rdma_cm_id *cma_id)
+{
+ struct rdma_conn_param conn_param;
+ int ret;
+
+ ret = iser_create_ib_conn_res((struct iser_conn *)cma_id->context);
+ if (ret)
+ goto failure;
+
+ iser_dbg("path.mtu is %d setting it to %d\n",
+ cma_id->route.path_rec->mtu, IB_MTU_1024);
+
+ /* we must set the MTU to 1024 as this is what the target is assuming */
+ if (cma_id->route.path_rec->mtu > IB_MTU_1024)
+ cma_id->route.path_rec->mtu = IB_MTU_1024;
+
+ memset(&conn_param, 0, sizeof conn_param);
+ conn_param.responder_resources = 4;
+ conn_param.initiator_depth = 1;
+ conn_param.retry_count = 7;
+ conn_param.rnr_retry_count = 6;
+
+ ret = rdma_connect(cma_id, &conn_param);
+ if (ret) {
+ iser_err("failure connecting: %d\n", ret);
+ goto failure;
+ }
+
+ return;
+failure:
+ iser_connect_error(cma_id);
+}
+
+static void iser_connected_handler(struct rdma_cm_id *cma_id)
+{
+ struct iser_conn *ib_conn;
+
+ ib_conn = (struct iser_conn *)cma_id->context;
+ ib_conn->state = ISER_CONN_UP;
+ wake_up_interruptible(&ib_conn->wait);
+}
+
+static void iser_disconnected_handler(struct rdma_cm_id *cma_id)
+{
+ struct iser_conn *ib_conn;
+
+ ib_conn = (struct iser_conn *)cma_id->context;
+ ib_conn->disc_evt_flag = 1;
+
+ /* getting here when the state is UP means that the conn is being *
+ * terminated asynchronously from the iSCSI layer's perspective. */
+ if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
+ ISER_CONN_TERMINATING))
+ iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
+ ISCSI_ERR_CONN_FAILED);
+
+ /* Complete the termination process if no posts are pending */
+ if ((atomic_read(&ib_conn->post_recv_buf_count) == 0) &&
+ (atomic_read(&ib_conn->post_send_buf_count) == 0)) {
+ ib_conn->state = ISER_CONN_DOWN;
+ wake_up_interruptible(&ib_conn->wait);
+ }
+}
+
+static int iser_cma_handler(struct rdma_cm_id *cma_id, struct rdma_cm_event *event)
+{
+ int ret = 0;
+
+ iser_err("event %d conn %p id %p\n",event->event,cma_id->context,cma_id);
+
+ switch (event->event) {
+ case RDMA_CM_EVENT_ADDR_RESOLVED:
+ iser_addr_handler(cma_id);
+ break;
+ case RDMA_CM_EVENT_ROUTE_RESOLVED:
+ iser_route_handler(cma_id);
+ break;
+ case RDMA_CM_EVENT_ESTABLISHED:
+ iser_connected_handler(cma_id);
+ break;
+ case RDMA_CM_EVENT_ADDR_ERROR:
+ case RDMA_CM_EVENT_ROUTE_ERROR:
+ case RDMA_CM_EVENT_CONNECT_ERROR:
+ case RDMA_CM_EVENT_UNREACHABLE:
+ case RDMA_CM_EVENT_REJECTED:
+ iser_err("event: %d, error: %d\n", event->event, event->status);
+ iser_connect_error(cma_id);
+ break;
+ case RDMA_CM_EVENT_DISCONNECTED:
+ iser_disconnected_handler(cma_id);
+ break;
+ case RDMA_CM_EVENT_DEVICE_REMOVAL:
+ BUG();
+ break;
+ case RDMA_CM_EVENT_CONNECT_RESPONSE:
+ BUG();
+ break;
+ case RDMA_CM_EVENT_CONNECT_REQUEST:
+ default:
+ break;
+ }
+ return ret;
+}
+
+int iser_conn_init(struct iser_conn **ibconn)
+{
+ struct iser_conn *ib_conn;
+
+ ib_conn = kzalloc(sizeof *ib_conn, GFP_KERNEL);
+ if (!ib_conn) {
+ iser_err("can't alloc memory for struct iser_conn\n");
+ return -ENOMEM;
+ }
+ ib_conn->state = ISER_CONN_INIT;
+ init_waitqueue_head(&ib_conn->wait);
+ atomic_set(&ib_conn->post_recv_buf_count, 0);
+ atomic_set(&ib_conn->post_send_buf_count, 0);
+ INIT_WORK(&ib_conn->comperror_work, iser_comp_error_worker,
+ ib_conn);
+ INIT_LIST_HEAD(&ib_conn->conn_list);
+ spin_lock_init(&ib_conn->lock);
+
+ *ibconn = ib_conn;
+ return 0;
+}
+
+ /**
+ * starts the process of connecting to the target
+ * sleeps untill the connection is established or rejected
+ */
+int iser_connect(struct iser_conn *ib_conn,
+ struct sockaddr_in *src_addr,
+ struct sockaddr_in *dst_addr,
+ int non_blocking)
+{
+ struct sockaddr *src, *dst;
+ int err = 0;
+
+ sprintf(ib_conn->name,"%d.%d.%d.%d:%d",
+ NIPQUAD(dst_addr->sin_addr.s_addr), dst_addr->sin_port);
+
+ /* the device is known only --after-- address resolution */
+ ib_conn->device = NULL;
+
+ iser_err("connecting to: %d.%d.%d.%d, port 0x%x\n",
+ NIPQUAD(dst_addr->sin_addr), dst_addr->sin_port);
+
+ ib_conn->state = ISER_CONN_PENDING;
+
+ ib_conn->cma_id = rdma_create_id(iser_cma_handler,
+ (void *)ib_conn,
+ RDMA_PS_TCP);
+ if (IS_ERR(ib_conn->cma_id)) {
+ err = PTR_ERR(ib_conn->cma_id);
+ iser_err("rdma_create_id failed: %d\n", err);
+ goto id_failure;
+ }
+
+ src = (struct sockaddr *)src_addr;
+ dst = (struct sockaddr *)dst_addr;
+ err = rdma_resolve_addr(ib_conn->cma_id, src, dst, 1000);
+ if (err) {
+ iser_err("rdma_resolve_addr failed: %d\n", err);
+ goto addr_failure;
+ }
+
+ if (!non_blocking) {
+ wait_event_interruptible(ib_conn->wait,
+ (ib_conn->state != ISER_CONN_PENDING));
+
+ if (ib_conn->state != ISER_CONN_UP) {
+ err = -EIO;
+ goto connect_failure;
+ }
+ }
+
+ mutex_lock(&ig.connlist_mutex);
+ list_add(&ib_conn->conn_list, &ig.connlist);
+ mutex_unlock(&ig.connlist_mutex);
+ return 0;
+
+id_failure:
+ ib_conn->cma_id = NULL;
+addr_failure:
+ ib_conn->state = ISER_CONN_DOWN;
+connect_failure:
+ iser_conn_release(ib_conn);
+ return err;
+}
+
+/**
+ * Frees all conn objects and deallocs conn descriptor
+ */
+void iser_conn_release(struct iser_conn *ib_conn)
+{
+ struct iser_device *device = ib_conn->device;
+
+ BUG_ON(ib_conn->state != ISER_CONN_DOWN);
+
+ mutex_lock(&ig.connlist_mutex);
+ list_del(&ib_conn->conn_list);
+ mutex_unlock(&ig.connlist_mutex);
+
+ iser_free_ib_conn_res(ib_conn);
+ ib_conn->device = NULL;
+ /* on EVENT_ADDR_ERROR there's no device yet for this conn */
+ if (device != NULL)
+ iser_device_try_release(device);
+ kfree(ib_conn);
+}
+
+
+/**
+ * iser_reg_page_vec - Register physical memory
+ *
+ * returns: 0 on success, errno code on failure
+ */
+int iser_reg_page_vec(struct iser_conn *ib_conn,
+ struct iser_page_vec *page_vec,
+ struct iser_mem_reg *mem_reg)
+{
+ struct ib_pool_fmr *mem;
+ u64 io_addr;
+ u64 *page_list;
+ int status;
+
+ page_list = page_vec->pages;
+ io_addr = page_list[0];
+
+ mem = ib_fmr_pool_map_phys(ib_conn->fmr_pool,
+ page_list,
+ page_vec->length,
+ &io_addr);
+
+ if (IS_ERR(mem)) {
+ status = (int)PTR_ERR(mem);
+ iser_err("ib_fmr_pool_map_phys failed: %d\n", status);
+ return status;
+ }
+
+ mem_reg->lkey = mem->fmr->lkey;
+ mem_reg->rkey = mem->fmr->rkey;
+ mem_reg->len = page_vec->length * PAGE_SIZE;
+ mem_reg->va = io_addr;
+ mem_reg->mem_h = (void *)mem;
+
+ mem_reg->va += page_vec->offset;
+ mem_reg->len = page_vec->data_size;
+
+ iser_dbg("PHYSICAL Mem.register, [PHYS p_array: 0x%p, sz: %d, "
+ "entry[0]: (0x%08lx,%ld)] -> "
+ "[lkey: 0x%08X mem_h: 0x%p va: 0x%08lX sz: %ld]\n",
+ page_vec, page_vec->length,
+ (unsigned long)page_vec->pages[0],
+ (unsigned long)page_vec->data_size,
+ (unsigned int)mem_reg->lkey, mem_reg->mem_h,
+ (unsigned long)mem_reg->va, (unsigned long)mem_reg->len);
+ return 0;
+}
+
+/**
+ * Unregister (previosuly registered) memory.
+ */
+void iser_unreg_mem(struct iser_mem_reg *reg)
+{
+ int ret;
+
+ iser_dbg("PHYSICAL Mem.Unregister mem_h %p\n",reg->mem_h);
+
+ ret = ib_fmr_pool_unmap((struct ib_pool_fmr *)reg->mem_h);
+ if (ret)
+ iser_err("ib_fmr_pool_unmap failed %d\n", ret);
+
+ reg->mem_h = NULL;
+}
+
+/**
+ * iser_dto_to_iov - builds IOV from a dto descriptor
+ */
+static void iser_dto_to_iov(struct iser_dto *dto, struct ib_sge *iov, int iov_len)
+{
+ int i;
+ struct ib_sge *sge;
+ struct iser_regd_buf *regd_buf;
+
+ if (dto->regd_vector_len > iov_len) {
+ iser_err("iov size %d too small for posting dto of len %d\n",
+ iov_len, dto->regd_vector_len);
+ BUG();
+ }
+
+ for (i = 0; i < dto->regd_vector_len; i++) {
+ sge = &iov[i];
+ regd_buf = dto->regd[i];
+
+ sge->addr = regd_buf->reg.va;
+ sge->length = regd_buf->reg.len;
+ sge->lkey = regd_buf->reg.lkey;
+
+ if (dto->used_sz[i] > 0) /* Adjust size */
+ sge->length = dto->used_sz[i];
+
+ /* offset and length should not exceed the regd buf length */
+ if (sge->length + dto->offset[i] > regd_buf->reg.len) {
+ iser_err("Used len:%ld + offset:%d, exceed reg.buf.len:"
+ "%ld in dto:0x%p [%d], va:0x%08lX\n",
+ (unsigned long)sge->length, dto->offset[i],
+ (unsigned long)regd_buf->reg.len, dto, i,
+ (unsigned long)sge->addr);
+ BUG();
+ }
+
+ sge->addr += dto->offset[i]; /* Adjust offset */
+ }
+}
+
+/**
+ * iser_post_recv - Posts a receive buffer.
+ *
+ * returns 0 on success, -1 on failure
+ */
+int iser_post_recv(struct iser_desc *rx_desc)
+{
+ int ib_ret, ret_val = 0;
+ struct ib_recv_wr recv_wr, *recv_wr_failed;
+ struct ib_sge iov[2];
+ struct iser_conn *ib_conn;
+ struct iser_dto *recv_dto = &rx_desc->dto;
+
+ /* Retrieve conn */
+ ib_conn = recv_dto->conn->ib_conn;
+
+ iser_dto_to_iov(recv_dto, iov, 2);
+
+ recv_wr.next = NULL;
+ recv_wr.sg_list = iov;
+ recv_wr.num_sge = recv_dto->regd_vector_len;
+ recv_wr.wr_id = (unsigned long)rx_desc;
+
+ atomic_inc(&ib_conn->post_recv_buf_count);
+ ib_ret = ib_post_recv(ib_conn->qp, &recv_wr, &recv_wr_failed);
+ if (ib_ret) {
+ iser_err("ib_post_recv failed ret=%d\n", ib_ret);
+ atomic_dec(&ib_conn->post_recv_buf_count);
+ ret_val = -1;
+ }
+
+ return ret_val;
+}
+
+/**
+ * iser_start_send - Initiate a Send DTO operation
+ *
+ * returns 0 on success, -1 on failure
+ */
+int iser_post_send(struct iser_desc *tx_desc)
+{
+ int ib_ret, ret_val = 0;
+ struct ib_send_wr send_wr, *send_wr_failed;
+ struct ib_sge iov[MAX_REGD_BUF_VECTOR_LEN];
+ struct iser_conn *ib_conn;
+ struct iser_dto *dto = &tx_desc->dto;
+
+ ib_conn = dto->conn->ib_conn;
+
+ iser_dto_to_iov(dto, iov, MAX_REGD_BUF_VECTOR_LEN);
+
+ send_wr.next = NULL;
+ send_wr.wr_id = (unsigned long)tx_desc;
+ send_wr.sg_list = iov;
+ send_wr.num_sge = dto->regd_vector_len;
+ send_wr.opcode = IB_WR_SEND;
+ send_wr.send_flags = dto->notify_enable ? IB_SEND_SIGNALED : 0;
+
+ atomic_inc(&ib_conn->post_send_buf_count);
+
+ ib_ret = ib_post_send(ib_conn->qp, &send_wr, &send_wr_failed);
+ if (ib_ret) {
+ iser_err("Failed to start SEND DTO, dto: 0x%p, IOV len: %d\n",
+ dto, dto->regd_vector_len);
+ iser_err("ib_post_send failed, ret:%d\n", ib_ret);
+ atomic_dec(&ib_conn->post_send_buf_count);
+ ret_val = -1;
+ }
+
+ return ret_val;
+}
+
+static void iser_comp_error_worker(void *data)
+{
+ struct iser_conn *ib_conn = data;
+
+ /* getting here when the state is UP means that the conn is being *
+ * terminated asynchronously from the iSCSI layer's perspective. */
+ if (iser_conn_state_comp_exch(ib_conn, ISER_CONN_UP,
+ ISER_CONN_TERMINATING))
+ iscsi_conn_failure(ib_conn->iser_conn->iscsi_conn,
+ ISCSI_ERR_CONN_FAILED);
+
+ /* complete the termination process if disconnect event was delivered *
+ * note there are no more non completed posts to the QP */
+ if (ib_conn->disc_evt_flag) {
+ ib_conn->state = ISER_CONN_DOWN;
+ wake_up_interruptible(&ib_conn->wait);
+ }
+}
+
+static void iser_handle_comp_error(struct iser_desc *desc)
+{
+ struct iser_dto *dto = &desc->dto;
+ struct iser_conn *ib_conn = dto->conn->ib_conn;
+
+ iser_dto_buffs_release(dto);
+
+ if (desc->type == ISCSI_RX) {
+ kfree(desc->data);
+ kmem_cache_free(ig.desc_cache, desc);
+ atomic_dec(&ib_conn->post_recv_buf_count);
+ } else { /* type is TX control/command/dataout */
+ if (desc->type == ISCSI_TX_DATAOUT)
+ kmem_cache_free(ig.desc_cache, desc);
+ atomic_dec(&ib_conn->post_send_buf_count);
+ }
+
+ if (atomic_read(&ib_conn->post_recv_buf_count) == 0 &&
+ atomic_read(&ib_conn->post_send_buf_count) == 0)
+ schedule_work(&ib_conn->comperror_work);
+}
+
+static void iser_cq_tasklet_fn(unsigned long data)
+{
+ struct iser_device *device = (struct iser_device *)data;
+ struct ib_cq *cq = device->cq;
+ struct ib_wc wc;
+ struct iser_desc *desc;
+ unsigned long xfer_len;
+
+ while (ib_poll_cq(cq, 1, &wc) == 1) {
+ desc = (struct iser_desc *) (unsigned long) wc.wr_id;
+ BUG_ON(desc == NULL);
+
+ if (wc.status == IB_WC_SUCCESS) {
+ if (desc->type == ISCSI_RX) {
+ xfer_len = (unsigned long)wc.byte_len;
+ iser_rcv_completion(desc, xfer_len);
+ } else /* type == ISCSI_TX_CONTROL/SCSI_CMD/DOUT */
+ iser_snd_completion(desc);
+ } else {
+ iser_err("comp w. error op %d status %d\n",desc->type,wc.status);
+ iser_handle_comp_error(desc);
+ }
+ }
+ /* #warning "it is assumed here that arming CQ only once its empty" *
+ * " would not cause interrupts to be missed" */
+ ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
+}
+
+static void iser_cq_callback(struct ib_cq *cq, void *cq_context)
+{
+ struct iser_device *device = (struct iser_device *)cq_context;
+
+ tasklet_schedule(&device->cq_tasklet);
+}
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-02 21:20:59 +0300