forked from Minki/linux
0a6907588a
iser connection needs asynchronous cleanup completions which are triggered in ep_disconnect. As a result we are keeping the corresponding iscsi_endpoint structure hanging for no good reason. In order to avoid that, we seperate iser_conn from iscsi_endpoint storage space to have their destruction being independent. iscsi_endpoint will be destroyed at ep_disconnect stage, while the iser connection will wait for asynchronous completions to be released in an orderly fashion. Signed-off-by: Ariel Nahum <arieln@mellanox.com> Signed-off-by: Roi Dayan <roid@mellanox.com> Signed-off-by: Sagi Grimberg <sagig@mellanox.com> Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Roland Dreier <roland@purestorage.com>
855 lines
23 KiB
C
855 lines
23 KiB
C
/*
|
|
* 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.
|
|
* Copyright (c) 2013-2014 Mellanox Technologies. 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
|
|
*/
|
|
|
|
#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/cdev.h>
|
|
#include <linux/in.h>
|
|
#include <linux/net.h>
|
|
#include <linux/scatterlist.h>
|
|
#include <linux/delay.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/module.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 struct scsi_host_template iscsi_iser_sht;
|
|
static struct iscsi_transport iscsi_iser_transport;
|
|
static struct scsi_transport_template *iscsi_iser_scsi_transport;
|
|
|
|
static unsigned int iscsi_max_lun = 512;
|
|
module_param_named(max_lun, iscsi_max_lun, uint, S_IRUGO);
|
|
|
|
int iser_debug_level = 0;
|
|
bool iser_pi_enable = false;
|
|
int iser_pi_guard = 0;
|
|
|
|
MODULE_DESCRIPTION("iSER (iSCSI Extensions for RDMA) Datamover");
|
|
MODULE_LICENSE("Dual BSD/GPL");
|
|
MODULE_AUTHOR("Alex Nezhinsky, Dan Bar Dov, Or Gerlitz");
|
|
MODULE_VERSION(DRV_VER);
|
|
|
|
module_param_named(debug_level, iser_debug_level, int, 0644);
|
|
MODULE_PARM_DESC(debug_level, "Enable debug tracing if > 0 (default:disabled)");
|
|
|
|
module_param_named(pi_enable, iser_pi_enable, bool, 0644);
|
|
MODULE_PARM_DESC(pi_enable, "Enable T10-PI offload support (default:disabled)");
|
|
|
|
module_param_named(pi_guard, iser_pi_guard, int, 0644);
|
|
MODULE_PARM_DESC(pi_guard, "T10-PI guard_type, 0:CRC|1:IP_CSUM (default:CRC)");
|
|
|
|
static struct workqueue_struct *release_wq;
|
|
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;
|
|
int datalen;
|
|
int ahslen;
|
|
|
|
/* verify PDU length */
|
|
datalen = ntoh24(hdr->dlength);
|
|
if (datalen > rx_data_len || (datalen + 4) < rx_data_len) {
|
|
iser_err("wrong datalen %d (hdr), %d (IB)\n",
|
|
datalen, rx_data_len);
|
|
rc = ISCSI_ERR_DATALEN;
|
|
goto error;
|
|
}
|
|
|
|
if (datalen != rx_data_len)
|
|
iser_dbg("aligned datalen (%d) hdr, %d (IB)\n",
|
|
datalen, rx_data_len);
|
|
|
|
/* read AHS */
|
|
ahslen = hdr->hlength * 4;
|
|
|
|
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);
|
|
}
|
|
|
|
static int iscsi_iser_pdu_alloc(struct iscsi_task *task, uint8_t opcode)
|
|
{
|
|
struct iscsi_iser_task *iser_task = task->dd_data;
|
|
|
|
task->hdr = (struct iscsi_hdr *)&iser_task->desc.iscsi_header;
|
|
task->hdr_max = sizeof(iser_task->desc.iscsi_header);
|
|
return 0;
|
|
}
|
|
|
|
int iser_initialize_task_headers(struct iscsi_task *task,
|
|
struct iser_tx_desc *tx_desc)
|
|
{
|
|
struct iser_conn *ib_conn = task->conn->dd_data;
|
|
struct iser_device *device = ib_conn->device;
|
|
struct iscsi_iser_task *iser_task = task->dd_data;
|
|
u64 dma_addr;
|
|
|
|
dma_addr = ib_dma_map_single(device->ib_device, (void *)tx_desc,
|
|
ISER_HEADERS_LEN, DMA_TO_DEVICE);
|
|
if (ib_dma_mapping_error(device->ib_device, dma_addr))
|
|
return -ENOMEM;
|
|
|
|
tx_desc->dma_addr = dma_addr;
|
|
tx_desc->tx_sg[0].addr = tx_desc->dma_addr;
|
|
tx_desc->tx_sg[0].length = ISER_HEADERS_LEN;
|
|
tx_desc->tx_sg[0].lkey = device->mr->lkey;
|
|
|
|
iser_task->ib_conn = ib_conn;
|
|
return 0;
|
|
}
|
|
/**
|
|
* iscsi_iser_task_init - Initialize task
|
|
* @task: iscsi task
|
|
*
|
|
* Initialize the task for the scsi command or mgmt command.
|
|
*/
|
|
static int
|
|
iscsi_iser_task_init(struct iscsi_task *task)
|
|
{
|
|
struct iscsi_iser_task *iser_task = task->dd_data;
|
|
|
|
if (iser_initialize_task_headers(task, &iser_task->desc))
|
|
return -ENOMEM;
|
|
|
|
/* mgmt task */
|
|
if (!task->sc)
|
|
return 0;
|
|
|
|
iser_task->command_sent = 0;
|
|
iser_task_rdma_init(iser_task);
|
|
iser_task->sc = task->sc;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* iscsi_iser_mtask_xmit - xmit management(immediate) task
|
|
* @conn: iscsi connection
|
|
* @task: 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_task *task)
|
|
{
|
|
int error = 0;
|
|
|
|
iser_dbg("mtask xmit [cid %d itt 0x%x]\n", conn->id, task->itt);
|
|
|
|
error = iser_send_control(conn, task);
|
|
|
|
/* since iser xmits control with zero copy, tasks can not be recycled
|
|
* right after sending them.
|
|
* The recycling scheme is based on whether a response is expected
|
|
* - if yes, the task is recycled at iscsi_complete_pdu
|
|
* - if no, the task is recycled at iser_snd_completion
|
|
*/
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
iscsi_iser_task_xmit_unsol_data(struct iscsi_conn *conn,
|
|
struct iscsi_task *task)
|
|
{
|
|
struct iscsi_r2t_info *r2t = &task->unsol_r2t;
|
|
struct iscsi_data hdr;
|
|
int error = 0;
|
|
|
|
/* Send data-out PDUs while there's still unsolicited data to send */
|
|
while (iscsi_task_has_unsol_data(task)) {
|
|
iscsi_prep_data_out_pdu(task, r2t, &hdr);
|
|
iser_dbg("Sending data-out: itt 0x%x, data count %d\n",
|
|
hdr.itt, r2t->data_count);
|
|
|
|
/* the buffer description has been passed with the command */
|
|
/* Send the command */
|
|
error = iser_send_data_out(conn, task, &hdr);
|
|
if (error) {
|
|
r2t->datasn--;
|
|
goto iscsi_iser_task_xmit_unsol_data_exit;
|
|
}
|
|
r2t->sent += r2t->data_count;
|
|
iser_dbg("Need to send %d more as data-out PDUs\n",
|
|
r2t->data_length - r2t->sent);
|
|
}
|
|
|
|
iscsi_iser_task_xmit_unsol_data_exit:
|
|
return error;
|
|
}
|
|
|
|
static int
|
|
iscsi_iser_task_xmit(struct iscsi_task *task)
|
|
{
|
|
struct iscsi_conn *conn = task->conn;
|
|
struct iscsi_iser_task *iser_task = task->dd_data;
|
|
int error = 0;
|
|
|
|
if (!task->sc)
|
|
return iscsi_iser_mtask_xmit(conn, task);
|
|
|
|
if (task->sc->sc_data_direction == DMA_TO_DEVICE) {
|
|
BUG_ON(scsi_bufflen(task->sc) == 0);
|
|
|
|
iser_dbg("cmd [itt %x total %d imm %d unsol_data %d\n",
|
|
task->itt, scsi_bufflen(task->sc),
|
|
task->imm_count, task->unsol_r2t.data_length);
|
|
}
|
|
|
|
iser_dbg("ctask xmit [cid %d itt 0x%x]\n",
|
|
conn->id, task->itt);
|
|
|
|
/* Send the cmd PDU */
|
|
if (!iser_task->command_sent) {
|
|
error = iser_send_command(conn, task);
|
|
if (error)
|
|
goto iscsi_iser_task_xmit_exit;
|
|
iser_task->command_sent = 1;
|
|
}
|
|
|
|
/* Send unsolicited data-out PDU(s) if necessary */
|
|
if (iscsi_task_has_unsol_data(task))
|
|
error = iscsi_iser_task_xmit_unsol_data(conn, task);
|
|
|
|
iscsi_iser_task_xmit_exit:
|
|
return error;
|
|
}
|
|
|
|
static void iscsi_iser_cleanup_task(struct iscsi_task *task)
|
|
{
|
|
struct iscsi_iser_task *iser_task = task->dd_data;
|
|
struct iser_tx_desc *tx_desc = &iser_task->desc;
|
|
struct iser_conn *ib_conn = task->conn->dd_data;
|
|
struct iser_device *device = ib_conn->device;
|
|
|
|
ib_dma_unmap_single(device->ib_device,
|
|
tx_desc->dma_addr, ISER_HEADERS_LEN, DMA_TO_DEVICE);
|
|
|
|
/* mgmt tasks do not need special cleanup */
|
|
if (!task->sc)
|
|
return;
|
|
|
|
if (iser_task->status == ISER_TASK_STATUS_STARTED) {
|
|
iser_task->status = ISER_TASK_STATUS_COMPLETED;
|
|
iser_task_rdma_finalize(iser_task);
|
|
}
|
|
}
|
|
|
|
static u8 iscsi_iser_check_protection(struct iscsi_task *task, sector_t *sector)
|
|
{
|
|
struct iscsi_iser_task *iser_task = task->dd_data;
|
|
|
|
if (iser_task->dir[ISER_DIR_IN])
|
|
return iser_check_task_pi_status(iser_task, ISER_DIR_IN,
|
|
sector);
|
|
else
|
|
return iser_check_task_pi_status(iser_task, ISER_DIR_OUT,
|
|
sector);
|
|
}
|
|
|
|
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;
|
|
|
|
cls_conn = iscsi_conn_setup(cls_session, 0, 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 = ISER_RECV_DATA_SEG_LEN;
|
|
|
|
return cls_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_session *session;
|
|
struct iser_conn *ib_conn;
|
|
struct iscsi_endpoint *ep;
|
|
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 */
|
|
ep = iscsi_lookup_endpoint(transport_eph);
|
|
if (!ep) {
|
|
iser_err("can't bind eph %llx\n",
|
|
(unsigned long long)transport_eph);
|
|
return -EINVAL;
|
|
}
|
|
ib_conn = ep->dd_data;
|
|
|
|
session = conn->session;
|
|
if (iser_alloc_rx_descriptors(ib_conn, session))
|
|
return -ENOMEM;
|
|
|
|
/* binds the iSER connection retrieved from the previously
|
|
* connected ep_handle to the iSCSI layer connection. exchanges
|
|
* connection pointers */
|
|
iser_info("binding iscsi conn %p to ib_conn %p\n", conn, ib_conn);
|
|
|
|
conn->dd_data = ib_conn;
|
|
ib_conn->iscsi_conn = conn;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
iscsi_iser_conn_start(struct iscsi_cls_conn *cls_conn)
|
|
{
|
|
struct iscsi_conn *iscsi_conn;
|
|
struct iser_conn *ib_conn;
|
|
|
|
iscsi_conn = cls_conn->dd_data;
|
|
ib_conn = iscsi_conn->dd_data;
|
|
reinit_completion(&ib_conn->stop_completion);
|
|
|
|
return iscsi_conn_start(cls_conn);
|
|
}
|
|
|
|
static void
|
|
iscsi_iser_conn_stop(struct iscsi_cls_conn *cls_conn, int flag)
|
|
{
|
|
struct iscsi_conn *conn = cls_conn->dd_data;
|
|
struct iser_conn *ib_conn = conn->dd_data;
|
|
|
|
iser_dbg("stopping iscsi_conn: %p, ib_conn: %p\n", conn, ib_conn);
|
|
iscsi_conn_stop(cls_conn, flag);
|
|
|
|
/*
|
|
* Userspace may have goofed up and not bound the connection or
|
|
* might have only partially setup the connection.
|
|
*/
|
|
if (ib_conn) {
|
|
conn->dd_data = NULL;
|
|
complete(&ib_conn->stop_completion);
|
|
}
|
|
}
|
|
|
|
static void iscsi_iser_session_destroy(struct iscsi_cls_session *cls_session)
|
|
{
|
|
struct Scsi_Host *shost = iscsi_session_to_shost(cls_session);
|
|
|
|
iscsi_session_teardown(cls_session);
|
|
iscsi_host_remove(shost);
|
|
iscsi_host_free(shost);
|
|
}
|
|
|
|
static inline unsigned int
|
|
iser_dif_prot_caps(int prot_caps)
|
|
{
|
|
return ((prot_caps & IB_PROT_T10DIF_TYPE_1) ? SHOST_DIF_TYPE1_PROTECTION |
|
|
SHOST_DIX_TYPE1_PROTECTION : 0) |
|
|
((prot_caps & IB_PROT_T10DIF_TYPE_2) ? SHOST_DIF_TYPE2_PROTECTION |
|
|
SHOST_DIX_TYPE2_PROTECTION : 0) |
|
|
((prot_caps & IB_PROT_T10DIF_TYPE_3) ? SHOST_DIF_TYPE3_PROTECTION |
|
|
SHOST_DIX_TYPE3_PROTECTION : 0);
|
|
}
|
|
|
|
static struct iscsi_cls_session *
|
|
iscsi_iser_session_create(struct iscsi_endpoint *ep,
|
|
uint16_t cmds_max, uint16_t qdepth,
|
|
uint32_t initial_cmdsn)
|
|
{
|
|
struct iscsi_cls_session *cls_session;
|
|
struct iscsi_session *session;
|
|
struct Scsi_Host *shost;
|
|
struct iser_conn *ib_conn = NULL;
|
|
|
|
shost = iscsi_host_alloc(&iscsi_iser_sht, 0, 0);
|
|
if (!shost)
|
|
return NULL;
|
|
shost->transportt = iscsi_iser_scsi_transport;
|
|
shost->cmd_per_lun = qdepth;
|
|
shost->max_lun = iscsi_max_lun;
|
|
shost->max_id = 0;
|
|
shost->max_channel = 0;
|
|
shost->max_cmd_len = 16;
|
|
|
|
/*
|
|
* older userspace tools (before 2.0-870) did not pass us
|
|
* the leading conn's ep so this will be NULL;
|
|
*/
|
|
if (ep) {
|
|
ib_conn = ep->dd_data;
|
|
if (ib_conn->pi_support) {
|
|
u32 sig_caps = ib_conn->device->dev_attr.sig_prot_cap;
|
|
|
|
scsi_host_set_prot(shost, iser_dif_prot_caps(sig_caps));
|
|
if (iser_pi_guard)
|
|
scsi_host_set_guard(shost, SHOST_DIX_GUARD_IP);
|
|
else
|
|
scsi_host_set_guard(shost, SHOST_DIX_GUARD_CRC);
|
|
}
|
|
}
|
|
|
|
if (iscsi_host_add(shost,
|
|
ep ? ib_conn->device->ib_device->dma_device : NULL))
|
|
goto free_host;
|
|
|
|
if (cmds_max > ISER_DEF_XMIT_CMDS_MAX) {
|
|
iser_info("cmds_max changed from %u to %u\n",
|
|
cmds_max, ISER_DEF_XMIT_CMDS_MAX);
|
|
cmds_max = ISER_DEF_XMIT_CMDS_MAX;
|
|
}
|
|
|
|
cls_session = iscsi_session_setup(&iscsi_iser_transport, shost,
|
|
cmds_max, 0,
|
|
sizeof(struct iscsi_iser_task),
|
|
initial_cmdsn, 0);
|
|
if (!cls_session)
|
|
goto remove_host;
|
|
session = cls_session->dd_data;
|
|
|
|
shost->can_queue = session->scsi_cmds_max;
|
|
return cls_session;
|
|
|
|
remove_host:
|
|
iscsi_host_remove(shost);
|
|
free_host:
|
|
iscsi_host_free(shost);
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
iscsi_iser_set_param(struct iscsi_cls_conn *cls_conn,
|
|
enum iscsi_param param, char *buf, int buflen)
|
|
{
|
|
int value;
|
|
|
|
switch (param) {
|
|
case ISCSI_PARAM_MAX_RECV_DLENGTH:
|
|
/* TBD */
|
|
break;
|
|
case ISCSI_PARAM_HDRDGST_EN:
|
|
sscanf(buf, "%d", &value);
|
|
if (value) {
|
|
iser_err("DataDigest wasn't negotiated to None\n");
|
|
return -EPROTO;
|
|
}
|
|
break;
|
|
case ISCSI_PARAM_DATADGST_EN:
|
|
sscanf(buf, "%d", &value);
|
|
if (value) {
|
|
iser_err("DataDigest wasn't negotiated to None\n");
|
|
return -EPROTO;
|
|
}
|
|
break;
|
|
case ISCSI_PARAM_IFMARKER_EN:
|
|
sscanf(buf, "%d", &value);
|
|
if (value) {
|
|
iser_err("IFMarker wasn't negotiated to No\n");
|
|
return -EPROTO;
|
|
}
|
|
break;
|
|
case ISCSI_PARAM_OFMARKER_EN:
|
|
sscanf(buf, "%d", &value);
|
|
if (value) {
|
|
iser_err("OFMarker wasn't negotiated to No\n");
|
|
return -EPROTO;
|
|
}
|
|
break;
|
|
default:
|
|
return iscsi_set_param(cls_conn, param, buf, buflen);
|
|
}
|
|
|
|
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 = 4;
|
|
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;
|
|
strcpy(stats->custom[3].desc, "fmr_unalign_cnt");
|
|
stats->custom[3].value = conn->fmr_unalign_cnt;
|
|
}
|
|
|
|
static int iscsi_iser_get_ep_param(struct iscsi_endpoint *ep,
|
|
enum iscsi_param param, char *buf)
|
|
{
|
|
struct iser_conn *ib_conn = ep->dd_data;
|
|
int len;
|
|
|
|
switch (param) {
|
|
case ISCSI_PARAM_CONN_PORT:
|
|
case ISCSI_PARAM_CONN_ADDRESS:
|
|
if (!ib_conn || !ib_conn->cma_id)
|
|
return -ENOTCONN;
|
|
|
|
return iscsi_conn_get_addr_param((struct sockaddr_storage *)
|
|
&ib_conn->cma_id->route.addr.dst_addr,
|
|
param, buf);
|
|
break;
|
|
default:
|
|
return -ENOSYS;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static struct iscsi_endpoint *
|
|
iscsi_iser_ep_connect(struct Scsi_Host *shost, struct sockaddr *dst_addr,
|
|
int non_blocking)
|
|
{
|
|
int err;
|
|
struct iser_conn *ib_conn;
|
|
struct iscsi_endpoint *ep;
|
|
|
|
ep = iscsi_create_endpoint(0);
|
|
if (!ep)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
ib_conn = kzalloc(sizeof(*ib_conn), GFP_KERNEL);
|
|
if (!ib_conn) {
|
|
err = -ENOMEM;
|
|
goto failure;
|
|
}
|
|
|
|
ep->dd_data = ib_conn;
|
|
ib_conn->ep = ep;
|
|
iser_conn_init(ib_conn);
|
|
|
|
err = iser_connect(ib_conn, NULL, dst_addr, non_blocking);
|
|
if (err)
|
|
goto failure;
|
|
|
|
return ep;
|
|
failure:
|
|
iscsi_destroy_endpoint(ep);
|
|
return ERR_PTR(err);
|
|
}
|
|
|
|
static int
|
|
iscsi_iser_ep_poll(struct iscsi_endpoint *ep, int timeout_ms)
|
|
{
|
|
struct iser_conn *ib_conn;
|
|
int rc;
|
|
|
|
ib_conn = ep->dd_data;
|
|
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_info("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(struct iscsi_endpoint *ep)
|
|
{
|
|
struct iser_conn *ib_conn;
|
|
|
|
ib_conn = ep->dd_data;
|
|
iser_info("ep %p ib conn %p state %d\n", ep, ib_conn, ib_conn->state);
|
|
iser_conn_terminate(ib_conn);
|
|
|
|
/*
|
|
* if iser_conn and iscsi_conn are bound, we must wait iscsi_conn_stop
|
|
* call and ISER_CONN_DOWN state before freeing the iser resources.
|
|
* otherwise we are safe to free resources immediately.
|
|
*/
|
|
if (ib_conn->iscsi_conn) {
|
|
INIT_WORK(&ib_conn->release_work, iser_release_work);
|
|
queue_work(release_wq, &ib_conn->release_work);
|
|
} else {
|
|
iser_conn_release(ib_conn);
|
|
}
|
|
iscsi_destroy_endpoint(ep);
|
|
}
|
|
|
|
static umode_t iser_attr_is_visible(int param_type, int param)
|
|
{
|
|
switch (param_type) {
|
|
case ISCSI_HOST_PARAM:
|
|
switch (param) {
|
|
case ISCSI_HOST_PARAM_NETDEV_NAME:
|
|
case ISCSI_HOST_PARAM_HWADDRESS:
|
|
case ISCSI_HOST_PARAM_INITIATOR_NAME:
|
|
return S_IRUGO;
|
|
default:
|
|
return 0;
|
|
}
|
|
case ISCSI_PARAM:
|
|
switch (param) {
|
|
case ISCSI_PARAM_MAX_RECV_DLENGTH:
|
|
case ISCSI_PARAM_MAX_XMIT_DLENGTH:
|
|
case ISCSI_PARAM_HDRDGST_EN:
|
|
case ISCSI_PARAM_DATADGST_EN:
|
|
case ISCSI_PARAM_CONN_ADDRESS:
|
|
case ISCSI_PARAM_CONN_PORT:
|
|
case ISCSI_PARAM_EXP_STATSN:
|
|
case ISCSI_PARAM_PERSISTENT_ADDRESS:
|
|
case ISCSI_PARAM_PERSISTENT_PORT:
|
|
case ISCSI_PARAM_PING_TMO:
|
|
case ISCSI_PARAM_RECV_TMO:
|
|
case ISCSI_PARAM_INITIAL_R2T_EN:
|
|
case ISCSI_PARAM_MAX_R2T:
|
|
case ISCSI_PARAM_IMM_DATA_EN:
|
|
case ISCSI_PARAM_FIRST_BURST:
|
|
case ISCSI_PARAM_MAX_BURST:
|
|
case ISCSI_PARAM_PDU_INORDER_EN:
|
|
case ISCSI_PARAM_DATASEQ_INORDER_EN:
|
|
case ISCSI_PARAM_TARGET_NAME:
|
|
case ISCSI_PARAM_TPGT:
|
|
case ISCSI_PARAM_USERNAME:
|
|
case ISCSI_PARAM_PASSWORD:
|
|
case ISCSI_PARAM_USERNAME_IN:
|
|
case ISCSI_PARAM_PASSWORD_IN:
|
|
case ISCSI_PARAM_FAST_ABORT:
|
|
case ISCSI_PARAM_ABORT_TMO:
|
|
case ISCSI_PARAM_LU_RESET_TMO:
|
|
case ISCSI_PARAM_TGT_RESET_TMO:
|
|
case ISCSI_PARAM_IFACE_NAME:
|
|
case ISCSI_PARAM_INITIATOR_NAME:
|
|
case ISCSI_PARAM_DISCOVERY_SESS:
|
|
return S_IRUGO;
|
|
default:
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static struct scsi_host_template iscsi_iser_sht = {
|
|
.module = THIS_MODULE,
|
|
.name = "iSCSI Initiator over iSER",
|
|
.queuecommand = iscsi_queuecommand,
|
|
.change_queue_depth = iscsi_change_queue_depth,
|
|
.sg_tablesize = ISCSI_ISER_SG_TABLESIZE,
|
|
.max_sectors = 1024,
|
|
.cmd_per_lun = ISER_DEF_CMD_PER_LUN,
|
|
.eh_abort_handler = iscsi_eh_abort,
|
|
.eh_device_reset_handler= iscsi_eh_device_reset,
|
|
.eh_target_reset_handler = iscsi_eh_recover_target,
|
|
.target_alloc = iscsi_target_alloc,
|
|
.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 | CAP_TEXT_NEGO,
|
|
/* session management */
|
|
.create_session = iscsi_iser_session_create,
|
|
.destroy_session = iscsi_iser_session_destroy,
|
|
/* connection management */
|
|
.create_conn = iscsi_iser_conn_create,
|
|
.bind_conn = iscsi_iser_conn_bind,
|
|
.destroy_conn = iscsi_conn_teardown,
|
|
.attr_is_visible = iser_attr_is_visible,
|
|
.set_param = iscsi_iser_set_param,
|
|
.get_conn_param = iscsi_conn_get_param,
|
|
.get_ep_param = iscsi_iser_get_ep_param,
|
|
.get_session_param = iscsi_session_get_param,
|
|
.start_conn = iscsi_iser_conn_start,
|
|
.stop_conn = iscsi_iser_conn_stop,
|
|
/* iscsi host params */
|
|
.get_host_param = iscsi_host_get_param,
|
|
.set_host_param = iscsi_host_set_param,
|
|
/* IO */
|
|
.send_pdu = iscsi_conn_send_pdu,
|
|
.get_stats = iscsi_iser_conn_get_stats,
|
|
.init_task = iscsi_iser_task_init,
|
|
.xmit_task = iscsi_iser_task_xmit,
|
|
.cleanup_task = iscsi_iser_cleanup_task,
|
|
.alloc_pdu = iscsi_iser_pdu_alloc,
|
|
.check_protection = iscsi_iser_check_protection,
|
|
/* 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) {
|
|
iser_err("Invalid max_lun value of %u\n", iscsi_max_lun);
|
|
return -EINVAL;
|
|
}
|
|
|
|
memset(&ig, 0, sizeof(struct iser_global));
|
|
|
|
ig.desc_cache = kmem_cache_create("iser_descriptors",
|
|
sizeof(struct iser_tx_desc),
|
|
0, SLAB_HWCACHE_ALIGN,
|
|
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);
|
|
|
|
release_wq = alloc_workqueue("release workqueue", 0, 0);
|
|
if (!release_wq) {
|
|
iser_err("failed to allocate release workqueue\n");
|
|
return -ENOMEM;
|
|
}
|
|
|
|
iscsi_iser_scsi_transport = iscsi_register_transport(
|
|
&iscsi_iser_transport);
|
|
if (!iscsi_iser_scsi_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)
|
|
{
|
|
struct iser_conn *ib_conn, *n;
|
|
int connlist_empty;
|
|
|
|
iser_dbg("Removing iSER datamover...\n");
|
|
destroy_workqueue(release_wq);
|
|
|
|
mutex_lock(&ig.connlist_mutex);
|
|
connlist_empty = list_empty(&ig.connlist);
|
|
mutex_unlock(&ig.connlist_mutex);
|
|
|
|
if (!connlist_empty) {
|
|
iser_err("Error cleanup stage completed but we still have iser "
|
|
"connections, destroying them anyway.\n");
|
|
list_for_each_entry_safe(ib_conn, n, &ig.connlist, conn_list) {
|
|
iser_conn_release(ib_conn);
|
|
}
|
|
}
|
|
|
|
iscsi_unregister_transport(&iscsi_iser_transport);
|
|
kmem_cache_destroy(ig.desc_cache);
|
|
}
|
|
|
|
module_init(iser_init);
|
|
module_exit(iser_exit);
|