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2d71d64481b975460fc825db978ce660a6e667fd
scst/srpt/src/ib_srpt.c
Bart Van Assche 2d71d64481 ib_srpt: Remove a superfluous test 
git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@4212 d57e44dd-8a1f-0410-8b47-8ef2f437770f
2012-04-14 13:04:11 +00:00

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/*
* Copyright (c) 2006 - 2009 Mellanox Technology Inc. All rights reserved.
* Copyright (C) 2008 - 2011 Bart Van Assche <bvanassche@acm.org>.
* Copyright (C) 2008 Vladislav Bolkhovitin <vst@vlnb.net>
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/ctype.h>
#include <linux/kthread.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <asm/atomic.h>
#if defined(CONFIG_SCST_PROC)
#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
#include <linux/proc_fs.h>
#include <linux/seq_file.h>
#endif
#endif
#include "ib_srpt.h"
#define LOG_PREFIX "ib_srpt" /* Prefix for SCST tracing macros. */
#if defined(INSIDE_KERNEL_TREE)
#include <scst/scst_debug.h>
#else
#include "scst_debug.h"
#endif
/* Name of this kernel module. */
#define DRV_NAME "ib_srpt"
#define DRV_VERSION "3.0.0-pre"
#define DRV_RELDATE "(not yet released)"
#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
/* Flags to be used in SCST debug tracing statements. */
#define DEFAULT_SRPT_TRACE_FLAGS (TRACE_OUT_OF_MEM | TRACE_MINOR \
| TRACE_MGMT | TRACE_SPECIAL)
/* Name of the entry that will be created under /proc/scsi_tgt/ib_srpt. */
#define SRPT_PROC_TRACE_LEVEL_NAME "trace_level"
#endif
#define SRPT_ID_STRING "SCST SRP target"
MODULE_AUTHOR("Vu Pham and Bart Van Assche");
MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol target "
"v" DRV_VERSION " (" DRV_RELDATE ")");
MODULE_LICENSE("Dual BSD/GPL");
/*
* Global Variables
*/
static u64 srpt_service_guid;
/* List of srpt_device structures. */
static atomic_t srpt_device_count;
#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
static unsigned long trace_flag = DEFAULT_SRPT_TRACE_FLAGS;
module_param(trace_flag, long, 0644);
MODULE_PARM_DESC(trace_flag, "SCST trace flags.");
#endif
static unsigned srp_max_rdma_size = DEFAULT_MAX_RDMA_SIZE;
module_param(srp_max_rdma_size, int, 0644);
MODULE_PARM_DESC(srp_max_rdma_size,
"Maximum size of SRP RDMA transfers for new connections.");
static unsigned srp_max_req_size = DEFAULT_MAX_REQ_SIZE;
module_param(srp_max_req_size, int, 0444);
MODULE_PARM_DESC(srp_max_req_size,
"Maximum size of SRP request messages in bytes.");
static unsigned int srp_max_rsp_size = DEFAULT_MAX_RSP_SIZE;
module_param(srp_max_rsp_size, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(srp_max_rsp_size,
"Maximum size of SRP response messages in bytes.");
static int srpt_srq_size = DEFAULT_SRPT_SRQ_SIZE;
module_param(srpt_srq_size, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(srpt_srq_size,
"Shared receive queue (SRQ) size.");
static int srpt_sq_size = DEF_SRPT_SQ_SIZE;
module_param(srpt_sq_size, int, 0444);
MODULE_PARM_DESC(srpt_sq_size,
"Per-channel send queue (SQ) size.");
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 31) \
|| defined(RHEL_MAJOR) && RHEL_MAJOR -0 <= 5
static int use_port_guid_in_session_name;
#else
static bool use_port_guid_in_session_name;
#endif
module_param(use_port_guid_in_session_name, bool, 0444);
MODULE_PARM_DESC(use_port_guid_in_session_name,
"Use target port ID in the session name such that"
" redundant paths between multiport systems can be masked.");
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 31) \
|| defined(RHEL_MAJOR) && RHEL_MAJOR -0 <= 5
static int use_node_guid_in_target_name;
#else
static bool use_node_guid_in_target_name;
#endif
module_param(use_node_guid_in_target_name, bool, 0444);
MODULE_PARM_DESC(use_node_guid_in_target_name,
"Use target node GUIDs of HCAs as SCST target names.");
static int srpt_get_u64_x(char *buffer, struct kernel_param *kp)
{
return sprintf(buffer, "0x%016llx", *(u64 *)kp->arg);
}
module_param_call(srpt_service_guid, NULL, srpt_get_u64_x, &srpt_service_guid,
0444);
MODULE_PARM_DESC(srpt_service_guid,
"Using this value for ioc_guid, id_ext, and cm_listen_id"
" instead of using the node_guid of the first HCA.");
static struct ib_client srpt_client;
static void srpt_unregister_mad_agent(struct srpt_device *sdev);
#ifdef CONFIG_SCST_PROC
static void srpt_unregister_procfs_entry(struct scst_tgt_template *tgt);
#endif /*CONFIG_SCST_PROC*/
static void srpt_unmap_sg_to_ib_sge(struct srpt_rdma_ch *ch,
struct srpt_send_ioctx *ioctx);
static void srpt_drain_channel(struct ib_cm_id *cm_id);
static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch);
static enum rdma_ch_state srpt_set_ch_state_to_disc(struct srpt_rdma_ch *ch)
{
unsigned long flags;
enum rdma_ch_state prev;
bool changed = false;
spin_lock_irqsave(&ch->spinlock, flags);
prev = ch->state;
switch (prev) {
case CH_CONNECTING:
case CH_LIVE:
ch->state = CH_DISCONNECTING;
wake_up_process(ch->thread);
changed = true;
break;
default:
break;
}
spin_unlock_irqrestore(&ch->spinlock, flags);
return prev;
}
static bool srpt_set_ch_state_to_draining(struct srpt_rdma_ch *ch)
{
unsigned long flags;
bool changed = false;
spin_lock_irqsave(&ch->spinlock, flags);
switch (ch->state) {
case CH_CONNECTING:
case CH_LIVE:
case CH_DISCONNECTING:
ch->state = CH_DRAINING;
wake_up_process(ch->thread);
changed = true;
break;
default:
break;
}
spin_unlock_irqrestore(&ch->spinlock, flags);
return changed;
}
/**
* srpt_test_and_set_ch_state() - Test and set the channel state.
*
* Returns true if and only if the channel state has been set to the new state.
*/
static bool srpt_test_and_set_ch_state(struct srpt_rdma_ch *ch,
enum rdma_ch_state old,
enum rdma_ch_state new)
{
unsigned long flags;
bool changed = false;
spin_lock_irqsave(&ch->spinlock, flags);
if (ch->state == old) {
ch->state = new;
wake_up_process(ch->thread);
changed = true;
}
spin_unlock_irqrestore(&ch->spinlock, flags);
return changed;
}
/**
* srpt_adjust_req_lim() - Adjust ch->req_lim and ch->req_lim_delta atomically.
*
* Returns the new value of ch->req_lim.
*/
static int srpt_adjust_req_lim(struct srpt_rdma_ch *ch, int req_lim_change,
int req_lim_delta_change)
{
int req_lim;
unsigned long flags;
spin_lock_irqsave(&ch->spinlock, flags);
ch->req_lim += req_lim_change;
req_lim = ch->req_lim;
ch->req_lim_delta += req_lim_delta_change;
spin_unlock_irqrestore(&ch->spinlock, flags);
return req_lim;
}
/**
* srpt_inc_req_lim() - Increase ch->req_lim and decrease ch->req_lim_delta.
*
* Returns one more than the previous value of ch->req_lim_delta.
*/
static int srpt_inc_req_lim(struct srpt_rdma_ch *ch)
{
int req_lim_delta;
unsigned long flags;
spin_lock_irqsave(&ch->spinlock, flags);
req_lim_delta = ch->req_lim_delta + 1;
ch->req_lim += req_lim_delta;
ch->req_lim_delta = 0;
spin_unlock_irqrestore(&ch->spinlock, flags);
return req_lim_delta;
}
/**
* srpt_undo_inc_req_lim() - Undo the effect of srpt_inc_req_lim.
*/
static int srpt_undo_inc_req_lim(struct srpt_rdma_ch *ch, int req_lim_delta)
{
return srpt_adjust_req_lim(ch, -req_lim_delta, req_lim_delta - 1);
}
/**
* srpt_event_handler() - Asynchronous IB event callback function.
*
* Callback function called by the InfiniBand core when an asynchronous IB
* event occurs. This callback may occur in interrupt context. See also
* section 11.5.2, Set Asynchronous Event Handler in the InfiniBand
* Architecture Specification.
*/
static void srpt_event_handler(struct ib_event_handler *handler,
struct ib_event *event)
{
struct srpt_device *sdev;
struct srpt_port *sport;
u8 port_num;
TRACE_ENTRY();
sdev = ib_get_client_data(event->device, &srpt_client);
if (!sdev || sdev->device != event->device)
return;
TRACE_DBG("ASYNC event= %d on device= %s",
event->event, sdev->device->name);
switch (event->event) {
case IB_EVENT_PORT_ERR:
port_num = event->element.port_num - 1;
if (port_num < sdev->device->phys_port_cnt) {
sport = &sdev->port[port_num];
sport->lid = 0;
sport->sm_lid = 0;
} else {
WARN(true, "event %d: port_num %d out of range 1..%d\n",
event->event, port_num + 1,
sdev->device->phys_port_cnt);
}
break;
case IB_EVENT_PORT_ACTIVE:
case IB_EVENT_LID_CHANGE:
case IB_EVENT_PKEY_CHANGE:
case IB_EVENT_SM_CHANGE:
case IB_EVENT_CLIENT_REREGISTER:
/* Refresh port data asynchronously. */
port_num = event->element.port_num - 1;
if (port_num < sdev->device->phys_port_cnt) {
sport = &sdev->port[port_num];
if (!sport->lid && !sport->sm_lid)
schedule_work(&sport->work);
} else {
WARN(true, "event %d: port_num %d out of range 1..%d\n",
event->event, port_num + 1,
sdev->device->phys_port_cnt);
}
break;
default:
PRINT_ERROR("received unrecognized IB event %d", event->event);
break;
}
TRACE_EXIT();
}
/**
* srpt_srq_event() - IB SRQ event callback function.
*/
static void srpt_srq_event(struct ib_event *event, void *ctx)
{
TRACE_DBG("SRQ event %d", event->event);
}
static const char *get_ch_state_name(enum rdma_ch_state s)
{
switch (s) {
case CH_CONNECTING:
return "connecting";
case CH_LIVE:
return "live";
case CH_DISCONNECTING:
return "disconnecting";
case CH_DRAINING:
return "draining";
}
return "???";
}
/**
* srpt_qp_event() - IB QP event callback function.
*/
static void srpt_qp_event(struct ib_event *event, struct srpt_rdma_ch *ch)
{
unsigned long flags;
TRACE_DBG("QP event %d on cm_id=%p sess_name=%s state=%s",
event->event, ch->cm_id, ch->sess_name,
get_ch_state_name(ch->state));
switch (event->event) {
case IB_EVENT_COMM_EST:
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20) || defined(BACKPORT_LINUX_WORKQUEUE_TO_2_6_19)
ib_cm_notify(ch->cm_id, event->event);
#else
/* Vanilla 2.6.19 kernel (or before) without OFED. */
PRINT_ERROR("how to perform ib_cm_notify() on a"
" vanilla 2.6.18 kernel ???");
#endif
break;
case IB_EVENT_QP_LAST_WQE_REACHED:
TRACE_DBG("%s, state %s: received Last WQE event.",
ch->sess_name, get_ch_state_name(ch->state));
BUG_ON(!ch->thread);
spin_lock_irqsave(&ch->spinlock, flags);
ch->last_wqe_received = true;
wake_up_process(ch->thread);
spin_unlock_irqrestore(&ch->spinlock, flags);
break;
default:
PRINT_ERROR("received unrecognized IB QP event %d",
event->event);
break;
}
}
/**
* srpt_set_ioc() - Helper function for initializing an IOUnitInfo structure.
*
* @slot: one-based slot number.
* @value: four-bit value.
*
* Copies the lowest four bits of value in element slot of the array of four
* bit elements called c_list (controller list). The index slot is one-based.
*/
static void srpt_set_ioc(u8 *c_list, u32 slot, u8 value)
{
u16 id;
u8 tmp;
id = (slot - 1) / 2;
if (slot & 0x1) {
tmp = c_list[id] & 0xf;
c_list[id] = (value << 4) | tmp;
} else {
tmp = c_list[id] & 0xf0;
c_list[id] = (value & 0xf) | tmp;
}
}
/**
* srpt_get_class_port_info() - Copy ClassPortInfo to a management datagram.
*
* See also section 16.3.3.1 ClassPortInfo in the InfiniBand Architecture
* Specification.
*/
static void srpt_get_class_port_info(struct ib_dm_mad *mad)
{
struct ib_class_port_info *cif;
cif = (struct ib_class_port_info *)mad->data;
memset(cif, 0, sizeof *cif);
cif->base_version = 1;
cif->class_version = 1;
cif->resp_time_value = 20;
mad->mad_hdr.status = 0;
}
/**
* srpt_get_iou() - Write IOUnitInfo to a management datagram.
*
* See also section 16.3.3.3 IOUnitInfo in the InfiniBand Architecture
* Specification. See also section B.7, table B.6 in the SRP r16a document.
*/
static void srpt_get_iou(struct ib_dm_mad *mad)
{
struct ib_dm_iou_info *ioui;
u8 slot;
int i;
ioui = (struct ib_dm_iou_info *)mad->data;
ioui->change_id = cpu_to_be16(1);
ioui->max_controllers = 16;
/* set present for slot 1 and empty for the rest */
srpt_set_ioc(ioui->controller_list, 1, 1);
for (i = 1, slot = 2; i < 16; i++, slot++)
srpt_set_ioc(ioui->controller_list, slot, 0);
mad->mad_hdr.status = 0;
}
/**
* srpt_get_ioc() - Write IOControllerprofile to a management datagram.
*
* See also section 16.3.3.4 IOControllerProfile in the InfiniBand
* Architecture Specification. See also section B.7, table B.7 in the SRP
* r16a document.
*/
static void srpt_get_ioc(struct srpt_device *sdev, u32 slot,
struct ib_dm_mad *mad)
{
struct ib_dm_ioc_profile *iocp;
iocp = (struct ib_dm_ioc_profile *)mad->data;
if (!slot || slot > 16) {
mad->mad_hdr.status = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
return;
}
if (slot > 2) {
mad->mad_hdr.status = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
return;
}
memset(iocp, 0, sizeof *iocp);
strcpy(iocp->id_string, SRPT_ID_STRING);
iocp->guid = cpu_to_be64(srpt_service_guid);
iocp->vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id);
iocp->device_id = cpu_to_be32(sdev->dev_attr.vendor_part_id);
iocp->device_version = cpu_to_be16(sdev->dev_attr.hw_ver);
iocp->subsys_vendor_id = cpu_to_be32(sdev->dev_attr.vendor_id);
iocp->subsys_device_id = 0x0;
iocp->io_class = cpu_to_be16(SRP_REV16A_IB_IO_CLASS);
iocp->io_subclass = cpu_to_be16(SRP_IO_SUBCLASS);
iocp->protocol = cpu_to_be16(SRP_PROTOCOL);
iocp->protocol_version = cpu_to_be16(SRP_PROTOCOL_VERSION);
iocp->send_queue_depth = cpu_to_be16(sdev->srq_size);
iocp->rdma_read_depth = 4;
iocp->send_size = cpu_to_be32(srp_max_req_size);
iocp->rdma_size = cpu_to_be32(min(max(srp_max_rdma_size, 256U),
1U << 24));
iocp->num_svc_entries = 1;
iocp->op_cap_mask = SRP_SEND_TO_IOC | SRP_SEND_FROM_IOC |
SRP_RDMA_READ_FROM_IOC | SRP_RDMA_WRITE_FROM_IOC;
mad->mad_hdr.status = 0;
}
/**
* srpt_get_svc_entries() - Write ServiceEntries to a management datagram.
*
* See also section 16.3.3.5 ServiceEntries in the InfiniBand Architecture
* Specification. See also section B.7, table B.8 in the SRP r16a document.
*/
static void srpt_get_svc_entries(u64 ioc_guid,
u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad)
{
struct ib_dm_svc_entries *svc_entries;
WARN_ON(!ioc_guid);
if (!slot || slot > 16) {
mad->mad_hdr.status = cpu_to_be16(DM_MAD_STATUS_INVALID_FIELD);
return;
}
if (slot > 2 || lo > hi || hi > 1) {
mad->mad_hdr.status = cpu_to_be16(DM_MAD_STATUS_NO_IOC);
return;
}
svc_entries = (struct ib_dm_svc_entries *)mad->data;
memset(svc_entries, 0, sizeof *svc_entries);
svc_entries->service_entries[0].id = cpu_to_be64(ioc_guid);
snprintf(svc_entries->service_entries[0].name,
sizeof(svc_entries->service_entries[0].name),
"%s%016llx",
SRP_SERVICE_NAME_PREFIX,
ioc_guid);
mad->mad_hdr.status = 0;
}
/**
* srpt_mgmt_method_get() - Process a received management datagram.
* @sp: source port through which the MAD has been received.
* @rq_mad: received MAD.
* @rsp_mad: response MAD.
*/
static void srpt_mgmt_method_get(struct srpt_port *sp, struct ib_mad *rq_mad,
struct ib_dm_mad *rsp_mad)
{
u16 attr_id;
u32 slot;
u8 hi, lo;
attr_id = be16_to_cpu(rq_mad->mad_hdr.attr_id);
switch (attr_id) {
case DM_ATTR_CLASS_PORT_INFO:
srpt_get_class_port_info(rsp_mad);
break;
case DM_ATTR_IOU_INFO:
srpt_get_iou(rsp_mad);
break;
case DM_ATTR_IOC_PROFILE:
slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
srpt_get_ioc(sp->sdev, slot, rsp_mad);
break;
case DM_ATTR_SVC_ENTRIES:
slot = be32_to_cpu(rq_mad->mad_hdr.attr_mod);
hi = (u8) ((slot >> 8) & 0xff);
lo = (u8) (slot & 0xff);
slot = (u16) ((slot >> 16) & 0xffff);
srpt_get_svc_entries(srpt_service_guid,
slot, hi, lo, rsp_mad);
break;
default:
rsp_mad->mad_hdr.status =
cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
break;
}
}
/**
* srpt_mad_send_handler() - Post MAD-send callback function.
*/
static void srpt_mad_send_handler(struct ib_mad_agent *mad_agent,
struct ib_mad_send_wc *mad_wc)
{
ib_destroy_ah(mad_wc->send_buf->ah);
ib_free_send_mad(mad_wc->send_buf);
}
/**
* srpt_mad_recv_handler() - MAD reception callback function.
*/
static void srpt_mad_recv_handler(struct ib_mad_agent *mad_agent,
struct ib_mad_recv_wc *mad_wc)
{
struct srpt_port *sport = (struct srpt_port *)mad_agent->context;
struct ib_ah *ah;
struct ib_mad_send_buf *rsp;
struct ib_dm_mad *dm_mad;
if (!mad_wc || !mad_wc->recv_buf.mad)
return;
ah = ib_create_ah_from_wc(mad_agent->qp->pd, mad_wc->wc,
mad_wc->recv_buf.grh, mad_agent->port_num);
if (IS_ERR(ah))
goto err;
BUILD_BUG_ON(offsetof(struct ib_dm_mad, data) != IB_MGMT_DEVICE_HDR);
rsp = ib_create_send_mad(mad_agent, mad_wc->wc->src_qp,
mad_wc->wc->pkey_index, 0,
IB_MGMT_DEVICE_HDR, IB_MGMT_DEVICE_DATA,
GFP_KERNEL);
if (IS_ERR(rsp))
goto err_rsp;
rsp->ah = ah;
dm_mad = rsp->mad;
memcpy(dm_mad, mad_wc->recv_buf.mad, sizeof *dm_mad);
dm_mad->mad_hdr.method = IB_MGMT_METHOD_GET_RESP;
dm_mad->mad_hdr.status = 0;
switch (mad_wc->recv_buf.mad->mad_hdr.method) {
case IB_MGMT_METHOD_GET:
srpt_mgmt_method_get(sport, mad_wc->recv_buf.mad, dm_mad);
break;
case IB_MGMT_METHOD_SET:
dm_mad->mad_hdr.status =
cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
break;
default:
dm_mad->mad_hdr.status =
cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD);
break;
}
if (!ib_post_send_mad(rsp, NULL)) {
ib_free_recv_mad(mad_wc);
/* will destroy_ah & free_send_mad in send completion */
return;
}
ib_free_send_mad(rsp);
err_rsp:
ib_destroy_ah(ah);
err:
ib_free_recv_mad(mad_wc);
}
/**
* srpt_refresh_port() - Configure a HCA port.
*
* Enable InfiniBand management datagram processing, update the cached sm_lid,
* lid and gid values, and register a callback function for processing MADs
* on the specified port.
*
* Note: It is safe to call this function more than once for the same port.
*/
static int srpt_refresh_port(struct srpt_port *sport)
{
struct ib_mad_reg_req reg_req;
struct ib_port_modify port_modify;
struct ib_port_attr port_attr;
int ret;
TRACE_ENTRY();
memset(&port_modify, 0, sizeof port_modify);
port_modify.set_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
port_modify.clr_port_cap_mask = 0;
ret = ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
if (ret)
goto err_mod_port;
ret = ib_query_port(sport->sdev->device, sport->port, &port_attr);
if (ret)
goto err_query_port;
sport->sm_lid = port_attr.sm_lid;
sport->lid = port_attr.lid;
ret = ib_query_gid(sport->sdev->device, sport->port, 0, &sport->gid);
if (ret)
goto err_query_port;
if (!sport->mad_agent) {
memset(&reg_req, 0, sizeof reg_req);
reg_req.mgmt_class = IB_MGMT_CLASS_DEVICE_MGMT;
reg_req.mgmt_class_version = IB_MGMT_BASE_VERSION;
set_bit(IB_MGMT_METHOD_GET, reg_req.method_mask);
set_bit(IB_MGMT_METHOD_SET, reg_req.method_mask);
sport->mad_agent = ib_register_mad_agent(sport->sdev->device,
sport->port,
IB_QPT_GSI,
&reg_req, 0,
srpt_mad_send_handler,
srpt_mad_recv_handler,
sport);
if (IS_ERR(sport->mad_agent)) {
ret = PTR_ERR(sport->mad_agent);
sport->mad_agent = NULL;
goto err_query_port;
}
}
TRACE_EXIT_RES(0);
return 0;
err_query_port:
port_modify.set_port_cap_mask = 0;
port_modify.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP;
ib_modify_port(sport->sdev->device, sport->port, 0, &port_modify);
err_mod_port:
TRACE_EXIT_RES(ret);
return ret;
}
/**
* srpt_unregister_mad_agent() - Unregister MAD callback functions.
*
* Note: It is safe to call this function more than once for the same device.
*/
static void srpt_unregister_mad_agent(struct srpt_device *sdev)
{
struct ib_port_modify port_modify = {
.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP,
};
struct srpt_port *sport;
int i;
for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
sport = &sdev->port[i - 1];
WARN_ON(sport->port != i);
if (ib_modify_port(sdev->device, i, 0, &port_modify) < 0)
PRINT_ERROR("disabling MAD processing failed.");
if (sport->mad_agent) {
ib_unregister_mad_agent(sport->mad_agent);
sport->mad_agent = NULL;
}
}
}
/**
* srpt_alloc_ioctx() - Allocate an SRPT I/O context structure.
*/
static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev,
int ioctx_size, int dma_size,
enum dma_data_direction dir)
{
struct srpt_ioctx *ioctx;
ioctx = kmalloc(ioctx_size, GFP_KERNEL);
if (!ioctx)
goto err;
ioctx->buf = kmalloc(dma_size, GFP_KERNEL);
if (!ioctx->buf)
goto err_free_ioctx;
ioctx->dma = ib_dma_map_single(sdev->device, ioctx->buf, dma_size, dir);
if (ib_dma_mapping_error(sdev->device, ioctx->dma))
goto err_free_buf;
return ioctx;
err_free_buf:
kfree(ioctx->buf);
err_free_ioctx:
kfree(ioctx);
err:
return NULL;
}
/**
* srpt_free_ioctx() - Free an SRPT I/O context structure.
*/
static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx,
int dma_size, enum dma_data_direction dir)
{
if (!ioctx)
return;
ib_dma_unmap_single(sdev->device, ioctx->dma, dma_size, dir);
kfree(ioctx->buf);
kfree(ioctx);
}
/**
* srpt_alloc_ioctx_ring() - Allocate a ring of SRPT I/O context structures.
* @sdev: Device to allocate the I/O context ring for.
* @ring_size: Number of elements in the I/O context ring.
* @ioctx_size: I/O context size.
* @dma_size: DMA buffer size.
* @dir: DMA data direction.
*/
static struct srpt_ioctx **srpt_alloc_ioctx_ring(struct srpt_device *sdev,
int ring_size, int ioctx_size,
int dma_size, enum dma_data_direction dir)
{
struct srpt_ioctx **ring;
int i;
TRACE_ENTRY();
WARN_ON(ioctx_size != sizeof(struct srpt_recv_ioctx) &&
ioctx_size != sizeof(struct srpt_send_ioctx));
ring = kmalloc(ring_size * sizeof(ring[0]), GFP_KERNEL);
if (!ring)
goto out;
for (i = 0; i < ring_size; ++i) {
ring[i] = srpt_alloc_ioctx(sdev, ioctx_size, dma_size, dir);
if (!ring[i])
goto err;
ring[i]->index = i;
}
goto out;
err:
while (--i >= 0)
srpt_free_ioctx(sdev, ring[i], dma_size, dir);
kfree(ring);
ring = NULL;
out:
TRACE_EXIT_HRES(ring);
return ring;
}
/**
* srpt_free_ioctx_ring() - Free the ring of SRPT I/O context structures.
*/
static void srpt_free_ioctx_ring(struct srpt_ioctx **ioctx_ring,
struct srpt_device *sdev, int ring_size,
int dma_size, enum dma_data_direction dir)
{
int i;
for (i = 0; i < ring_size; ++i)
srpt_free_ioctx(sdev, ioctx_ring[i], dma_size, dir);
kfree(ioctx_ring);
}
/**
* srpt_set_cmd_state() - Set the state of a SCSI command.
* @new: New state.
*
* Does not modify the state of aborted commands. Returns the previous command
* state.
*/
static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,
enum srpt_command_state new)
{
enum srpt_command_state previous;
BUG_ON(!ioctx);
spin_lock(&ioctx->spinlock);
previous = ioctx->state;
if (previous != SRPT_STATE_DONE)
ioctx->state = new;
spin_unlock(&ioctx->spinlock);
return previous;
}
/**
* srpt_test_and_set_cmd_state() - Test and set the state of a command.
*
* Returns true if and only if the previous command state was equal to 'old'.
*/
static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,
enum srpt_command_state old,
enum srpt_command_state new)
{
enum srpt_command_state previous;
WARN_ON(!ioctx);
WARN_ON(old == SRPT_STATE_DONE);
WARN_ON(new == SRPT_STATE_NEW);
spin_lock(&ioctx->spinlock);
previous = ioctx->state;
if (previous == old)
ioctx->state = new;
spin_unlock(&ioctx->spinlock);
return previous == old;
}
/**
* srpt_post_recv() - Post an IB receive request.
*/
static int srpt_post_recv(struct srpt_device *sdev,
struct srpt_recv_ioctx *ioctx)
{
struct ib_sge list;
struct ib_recv_wr wr, *bad_wr;
BUG_ON(!sdev);
wr.wr_id = encode_wr_id(SRPT_RECV, ioctx->ioctx.index);
list.addr = ioctx->ioctx.dma;
list.length = srp_max_req_size;
list.lkey = sdev->mr->lkey;
wr.next = NULL;
wr.sg_list = &list;
wr.num_sge = 1;
return ib_post_srq_recv(sdev->srq, &wr, &bad_wr);
}
static int srpt_adjust_srq_wr_avail(struct srpt_rdma_ch *ch, int delta)
{
int res;
unsigned long flags;
spin_lock_irqsave(&ch->spinlock, flags);
ch->sq_wr_avail += delta;
res = ch->sq_wr_avail;
spin_unlock_irqrestore(&ch->spinlock, flags);
return res;
}
/**
* srpt_post_send() - Post an IB send request.
*
* Returns zero upon success and a non-zero value upon failure.
*/
static int srpt_post_send(struct srpt_rdma_ch *ch,
struct srpt_send_ioctx *ioctx, int len)
{
struct ib_sge list;
struct ib_send_wr wr, *bad_wr;
struct srpt_device *sdev = ch->sport->sdev;
int ret;
ret = -ENOMEM;
if (srpt_adjust_srq_wr_avail(ch, -1) < 0) {
PRINT_WARNING("IB send queue full (needed 1)");
goto out;
}
ib_dma_sync_single_for_device(sdev->device, ioctx->ioctx.dma, len,
DMA_TO_DEVICE);
list.addr = ioctx->ioctx.dma;
list.length = len;
list.lkey = sdev->mr->lkey;
wr.next = NULL;
wr.wr_id = encode_wr_id(SRPT_SEND, ioctx->ioctx.index);
wr.sg_list = &list;
wr.num_sge = 1;
wr.opcode = IB_WR_SEND;
wr.send_flags = IB_SEND_SIGNALED;
ret = ib_post_send(ch->qp, &wr, &bad_wr);
out:
if (ret < 0)
srpt_adjust_srq_wr_avail(ch, 1);
return ret;
}
/**
* srpt_get_desc_tbl() - Parse the data descriptors of an SRP_CMD request.
* @ioctx: Pointer to the I/O context associated with the request.
* @srp_cmd: Pointer to the SRP_CMD request data.
* @dir: Pointer to the variable to which the transfer direction will be
* written.
* @data_len: Pointer to the variable to which the total data length of all
* descriptors in the SRP_CMD request will be written.
*
* This function initializes ioctx->nrbuf and ioctx->r_bufs.
*
* Returns -EINVAL when the SRP_CMD request contains inconsistent descriptors;
* -ENOMEM when memory allocation fails and zero upon success.
*/
static int srpt_get_desc_tbl(struct srpt_send_ioctx *ioctx,
struct srp_cmd *srp_cmd,
scst_data_direction *dir, u64 *data_len)
{
struct srp_indirect_buf *idb;
struct srp_direct_buf *db;
unsigned add_cdb_offset;
int ret;
/*
* The pointer computations below will only be compiled correctly
* if srp_cmd::add_data is declared as s8*, u8*, s8[] or u8[], so check
* whether srp_cmd::add_data has been declared as a byte pointer.
*/
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 31)
BUILD_BUG_ON(!__same_type(srp_cmd->add_data[0], (s8)0)
&& !__same_type(srp_cmd->add_data[0], (u8)0));
#else
/* Note: the __same_type() macro has been introduced in kernel 2.6.31.*/
#endif
BUG_ON(!dir);
BUG_ON(!data_len);
ret = 0;
*data_len = 0;
/*
* The lower four bits of the buffer format field contain the DATA-IN
* buffer descriptor format, and the highest four bits contain the
* DATA-OUT buffer descriptor format.
*/
*dir = SCST_DATA_NONE;
if (srp_cmd->buf_fmt & 0xf)
/* DATA-IN: transfer data from target to initiator (read). */
*dir = SCST_DATA_READ;
else if (srp_cmd->buf_fmt >> 4)
/* DATA-OUT: transfer data from initiator to target (write). */
*dir = SCST_DATA_WRITE;
/*
* According to the SRP spec, the lower two bits of the 'ADDITIONAL
* CDB LENGTH' field are reserved and the size in bytes of this field
* is four times the value specified in bits 3..7. Hence the "& ~3".
*/
add_cdb_offset = srp_cmd->add_cdb_len & ~3;
if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_DIRECT) ||
((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_DIRECT)) {
ioctx->n_rbuf = 1;
ioctx->rbufs = &ioctx->single_rbuf;
db = (struct srp_direct_buf *)(srp_cmd->add_data
+ add_cdb_offset);
memcpy(ioctx->rbufs, db, sizeof *db);
*data_len = be32_to_cpu(db->len);
} else if (((srp_cmd->buf_fmt & 0xf) == SRP_DATA_DESC_INDIRECT) ||
((srp_cmd->buf_fmt >> 4) == SRP_DATA_DESC_INDIRECT)) {
idb = (struct srp_indirect_buf *)(srp_cmd->add_data
+ add_cdb_offset);
ioctx->n_rbuf = be32_to_cpu(idb->table_desc.len) / sizeof *db;
if (ioctx->n_rbuf >
(srp_cmd->data_out_desc_cnt + srp_cmd->data_in_desc_cnt)) {
PRINT_ERROR("received unsupported SRP_CMD request type"
" (%u out + %u in != %u / %zu)",
srp_cmd->data_out_desc_cnt,
srp_cmd->data_in_desc_cnt,
be32_to_cpu(idb->table_desc.len),
sizeof(*db));
ioctx->n_rbuf = 0;
ret = -EINVAL;
goto out;
}
if (ioctx->n_rbuf == 1)
ioctx->rbufs = &ioctx->single_rbuf;
else {
ioctx->rbufs =
kmalloc(ioctx->n_rbuf * sizeof *db, GFP_ATOMIC);
if (!ioctx->rbufs) {
ioctx->n_rbuf = 0;
ret = -ENOMEM;
goto out;
}
}
db = idb->desc_list;
memcpy(ioctx->rbufs, db, ioctx->n_rbuf * sizeof *db);
*data_len = be32_to_cpu(idb->len);
}
out:
return ret;
}
/**
* srpt_init_ch_qp() - Initialize queue pair attributes.
*
* Initialized the attributes of queue pair 'qp' by allowing local write,
* remote read and remote write. Also transitions 'qp' to state IB_QPS_INIT.
*/
static int srpt_init_ch_qp(struct srpt_rdma_ch *ch, struct ib_qp *qp)
{
struct ib_qp_attr *attr;
int ret;
attr = kzalloc(sizeof *attr, GFP_KERNEL);
if (!attr)
return -ENOMEM;
attr->qp_state = IB_QPS_INIT;
attr->qp_access_flags = IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_READ |
IB_ACCESS_REMOTE_WRITE;
attr->port_num = ch->sport->port;
attr->pkey_index = 0;
ret = ib_modify_qp(qp, attr,
IB_QP_STATE | IB_QP_ACCESS_FLAGS | IB_QP_PORT |
IB_QP_PKEY_INDEX);
kfree(attr);
return ret;
}
/**
* srpt_ch_qp_rtr() - Change the state of a channel to 'ready to receive' (RTR).
* @ch: channel of the queue pair.
* @qp: queue pair to change the state of.
*
* Returns zero upon success and a negative value upon failure.
*/
static int srpt_ch_qp_rtr(struct srpt_rdma_ch *ch, struct ib_qp *qp)
{
struct ib_qp_attr *attr;
int attr_mask;
int ret;
attr = kzalloc(sizeof *attr, GFP_KERNEL);
if (!attr)
return -ENOMEM;
attr->qp_state = IB_QPS_RTR;
ret = ib_cm_init_qp_attr(ch->cm_id, attr, &attr_mask);
if (ret)
goto out;
attr->max_dest_rd_atomic = 4;
TRACE_DBG("qp timeout = %d", attr->timeout);
ret = ib_modify_qp(qp, attr, attr_mask);
out:
kfree(attr);
return ret;
}
/**
* srpt_ch_qp_rts() - Change the state of a channel to 'ready to send' (RTS).
* @ch: channel of the queue pair.
* @qp: queue pair to change the state of.
*
* Returns zero upon success and a negative value upon failure.
*/
static int srpt_ch_qp_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp)
{
struct ib_qp_attr *attr;
int attr_mask;
int ret;
uint64_t T_tr_ns;
uint32_t T_tr_ms, max_compl_time_ms;
attr = kzalloc(sizeof *attr, GFP_KERNEL);
if (!attr)
return -ENOMEM;
attr->qp_state = IB_QPS_RTS;
ret = ib_cm_init_qp_attr(ch->cm_id, attr, &attr_mask);
if (ret)
goto out;
attr->max_rd_atomic = 4;
/*
* From IBTA C9-140: Transport Timer timeout interval
* T_tr = 4.096 us * 2**(local ACK timeout) where the local ACK timeout
* is a five-bit value, with zero meaning that the timer is disabled.
*/
WARN_ON(attr->timeout >= (1 << 5));
if (attr->timeout) {
T_tr_ns = 1ULL << (12 + attr->timeout);
max_compl_time_ms = attr->retry_cnt * 4 * T_tr_ns;
do_div(max_compl_time_ms, 1000000);
T_tr_ms = T_tr_ns;
do_div(T_tr_ms, 1000000);
TRACE_DBG("Session %s: QP local ack timeout = %d or T_tr ="
" %u ms; retry_cnt = %d; max compl. time = %d ms",
ch->sess_name, attr->timeout, T_tr_ms,
attr->retry_cnt, max_compl_time_ms);
if (max_compl_time_ms >= RDMA_COMPL_TIMEOUT_S * 1000) {
PRINT_ERROR("Maximum RDMA completion time (%d ms)"
" exceeds ib_srpt timeout (%d ms)",
max_compl_time_ms,
1000 * RDMA_COMPL_TIMEOUT_S);
}
}
ret = ib_modify_qp(qp, attr, attr_mask);
out:
kfree(attr);
return ret;
}
/**
* srpt_ch_qp_err() - Set the channel queue pair state to 'error'.
*/
static int srpt_ch_qp_err(struct srpt_rdma_ch *ch)
{
struct ib_qp_attr *attr;
int ret;
attr = kzalloc(sizeof *attr, GFP_KERNEL);
if (!attr)
return -ENOMEM;
attr->qp_state = IB_QPS_ERR;
ret = ib_modify_qp(ch->qp, attr, IB_QP_STATE);
kfree(attr);
return ret;
}
/**
* srpt_get_send_ioctx() - Obtain an I/O context for sending to the initiator.
*/
static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
{
struct srpt_send_ioctx *ioctx;
unsigned long flags;
BUG_ON(!ch);
ioctx = NULL;
spin_lock_irqsave(&ch->spinlock, flags);
if (!list_empty(&ch->free_list)) {
ioctx = list_first_entry(&ch->free_list,
struct srpt_send_ioctx, free_list);
list_del(&ioctx->free_list);
}
spin_unlock_irqrestore(&ch->spinlock, flags);
if (!ioctx)
return ioctx;
BUG_ON(ioctx->ch != ch);
spin_lock_init(&ioctx->spinlock);
ioctx->state = SRPT_STATE_NEW;
ioctx->n_rbuf = 0;
ioctx->rbufs = NULL;
ioctx->n_rdma = 0;
ioctx->n_rdma_ius = 0;
ioctx->rdma_ius = NULL;
ioctx->mapped_sg_count = 0;
ioctx->scmnd = NULL;
return ioctx;
}
/**
* srpt_put_send_ioctx() - Free up resources.
*/
static void srpt_put_send_ioctx(struct srpt_send_ioctx *ioctx)
{
struct srpt_rdma_ch *ch;
unsigned long flags;
BUG_ON(!ioctx);
ch = ioctx->ch;
BUG_ON(!ch);
ioctx->scmnd = NULL;
/*
* If the WARN_ON() below gets triggered this means that
* srpt_unmap_sg_to_ib_sge() has not been called before
* scst_tgt_cmd_done().
*/
WARN_ON(ioctx->mapped_sg_count);
if (ioctx->n_rbuf > 1) {
kfree(ioctx->rbufs);
ioctx->rbufs = NULL;
ioctx->n_rbuf = 0;
}
spin_lock_irqsave(&ch->spinlock, flags);
list_add(&ioctx->free_list, &ch->free_list);
spin_unlock_irqrestore(&ch->spinlock, flags);
}
/**
* srpt_abort_cmd() - Make SCST stop processing a SCSI command.
* @ioctx: I/O context associated with the SCSI command.
* @context: Preferred execution context.
*/
static void srpt_abort_cmd(struct srpt_send_ioctx *ioctx,
enum scst_exec_context context)
{
struct scst_cmd *scmnd;
enum srpt_command_state state;
TRACE_ENTRY();
BUG_ON(!ioctx);
/*
* If the command is in a state where the target core is waiting for
* the ib_srpt driver, change the state to the next state. Changing
* the state of the command from SRPT_STATE_NEED_DATA to
* SRPT_STATE_DATA_IN ensures that srpt_xmit_response() will call this
* function a second time.
*/
spin_lock(&ioctx->spinlock);
state = ioctx->state;
switch (state) {
case SRPT_STATE_NEED_DATA:
ioctx->state = SRPT_STATE_DATA_IN;
break;
case SRPT_STATE_DATA_IN:
case SRPT_STATE_CMD_RSP_SENT:
case SRPT_STATE_MGMT_RSP_SENT:
ioctx->state = SRPT_STATE_DONE;
break;
default:
break;
}
spin_unlock(&ioctx->spinlock);
if (state == SRPT_STATE_DONE)
goto out;
scmnd = ioctx->scmnd;
WARN_ON(!scmnd);
if (!scmnd)
goto out;
WARN_ON(ioctx != scst_cmd_get_tgt_priv(scmnd));
TRACE_DBG("Aborting cmd with state %d and tag %lld",
state, scst_cmd_get_tag(scmnd));
switch (state) {
case SRPT_STATE_NEW:
case SRPT_STATE_DATA_IN:
case SRPT_STATE_MGMT:
/*
* Do nothing - defer abort processing until
* srpt_xmit_response() is invoked.
*/
WARN_ON(!scst_cmd_aborted_on_xmit(scmnd));
break;
case SRPT_STATE_NEED_DATA:
/* SCST_DATA_WRITE - RDMA read error or RDMA read timeout. */
scst_rx_data(ioctx->scmnd, SCST_RX_STATUS_ERROR, context);
break;
case SRPT_STATE_CMD_RSP_SENT:
/*
* SRP_RSP sending failed or the SRP_RSP send completion has
* not been received in time.
*/
srpt_unmap_sg_to_ib_sge(ioctx->ch, ioctx);
srpt_put_send_ioctx(ioctx);
scst_set_delivery_status(scmnd, SCST_CMD_DELIVERY_ABORTED);
scst_tgt_cmd_done(scmnd, context);
break;
case SRPT_STATE_MGMT_RSP_SENT:
/*
* Management command response sending failed. This state is
* never reached since there is no scmnd associated with
* management commands. Note: the SCST core frees these
* commands immediately after srpt_tsk_mgmt_done() returned.
*/
WARN_ON("ERROR: unexpected command state");
break;
default:
WARN_ON("ERROR: unexpected command state");
break;
}
out:
;
TRACE_EXIT();
}
/**
* srpt_handle_send_err_comp() - Process an IB_WC_SEND error completion.
*/
static void srpt_handle_send_err_comp(struct srpt_rdma_ch *ch, u64 wr_id,
enum scst_exec_context context)
{
struct srpt_send_ioctx *ioctx;
enum srpt_command_state state;
struct scst_cmd *scmnd;
u32 index;
srpt_adjust_srq_wr_avail(ch, 1);
index = idx_from_wr_id(wr_id);
ioctx = ch->ioctx_ring[index];
state = ioctx->state;
scmnd = ioctx->scmnd;
EXTRACHECKS_WARN_ON(state != SRPT_STATE_CMD_RSP_SENT
&& state != SRPT_STATE_MGMT_RSP_SENT
&& state != SRPT_STATE_NEED_DATA
&& state != SRPT_STATE_DONE);
/*
* If SRP_RSP sending failed, undo the ch->req_lim and ch->req_lim_delta
* changes.
*/
if (state == SRPT_STATE_CMD_RSP_SENT
|| state == SRPT_STATE_MGMT_RSP_SENT)
srpt_undo_inc_req_lim(ch, ioctx->req_lim_delta);
if (state != SRPT_STATE_DONE) {
if (scmnd)
srpt_abort_cmd(ioctx, context);
else
srpt_put_send_ioctx(ioctx);
} else
PRINT_ERROR("Received more than one IB error completion"
" for wr_id = %u.", (unsigned)index);
}
/**
* srpt_handle_send_comp() - Process an IB send completion notification.
*/
static void srpt_handle_send_comp(struct srpt_rdma_ch *ch,
struct srpt_send_ioctx *ioctx,
enum scst_exec_context context)
{
enum srpt_command_state state;
srpt_adjust_srq_wr_avail(ch, 1);
state = srpt_set_cmd_state(ioctx, SRPT_STATE_DONE);
EXTRACHECKS_WARN_ON(state != SRPT_STATE_CMD_RSP_SENT
&& state != SRPT_STATE_MGMT_RSP_SENT
&& state != SRPT_STATE_DONE);
if (state != SRPT_STATE_DONE) {
struct scst_cmd *scmnd;
scmnd = ioctx->scmnd;
EXTRACHECKS_WARN_ON((state == SRPT_STATE_MGMT_RSP_SENT)
!= (scmnd == NULL));
if (scmnd) {
srpt_unmap_sg_to_ib_sge(ch, ioctx);
srpt_put_send_ioctx(ioctx);
scst_tgt_cmd_done(scmnd, context);
} else
srpt_put_send_ioctx(ioctx);
} else {
PRINT_ERROR("IB completion has been received too late for"
" wr_id = %u.", ioctx->ioctx.index);
}
}
/**
* srpt_handle_rdma_comp() - Process an IB RDMA completion notification.
*/
static void srpt_handle_rdma_comp(struct srpt_rdma_ch *ch,
struct srpt_send_ioctx *ioctx,
enum srpt_opcode opcode,
enum scst_exec_context context)
{
struct scst_cmd *scmnd;
EXTRACHECKS_WARN_ON(ioctx->n_rdma <= 0);
srpt_adjust_srq_wr_avail(ch, ioctx->n_rdma);
scmnd = ioctx->scmnd;
if (opcode == SRPT_RDMA_READ_LAST && scmnd) {
if (srpt_test_and_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA,
SRPT_STATE_DATA_IN))
scst_rx_data(ioctx->scmnd, SCST_RX_STATUS_SUCCESS,
context);
else
PRINT_ERROR("%s[%d]: wrong state = %d", __func__,
__LINE__, ioctx->state);
} else if (opcode == SRPT_RDMA_ABORT) {
ioctx->rdma_aborted = true;
} else {
WARN(true, "scmnd == NULL (opcode %d)", opcode);
}
}
/**
* srpt_handle_rdma_err_comp() - Process an IB RDMA error completion.
*/
static void srpt_handle_rdma_err_comp(struct srpt_rdma_ch *ch,
struct srpt_send_ioctx *ioctx,
enum srpt_opcode opcode,
enum scst_exec_context context)
{
struct scst_cmd *scmnd;
enum srpt_command_state state;
scmnd = ioctx->scmnd;
state = ioctx->state;
if (scmnd) {
switch (opcode) {
case SRPT_RDMA_READ_LAST:
if (ioctx->n_rdma <= 0) {
PRINT_ERROR("Received invalid RDMA read error"
" completion with idx %d",
ioctx->ioctx.index);
break;
}
srpt_adjust_srq_wr_avail(ch, ioctx->n_rdma);
if (state == SRPT_STATE_NEED_DATA)
srpt_abort_cmd(ioctx, context);
else
PRINT_ERROR("%s[%d]: wrong state = %d",
__func__, __LINE__, state);
break;
case SRPT_RDMA_WRITE_LAST:
scst_set_delivery_status(scmnd,
SCST_CMD_DELIVERY_ABORTED);
break;
default:
PRINT_ERROR("%s[%d]: opcode = %u", __func__, __LINE__,
opcode);
break;
}
} else
PRINT_ERROR("%s[%d]: scmnd == NULL", __func__, __LINE__);
}
/**
* srpt_build_cmd_rsp() - Build an SRP_RSP response.
* @ch: RDMA channel through which the request has been received.
* @ioctx: I/O context associated with the SRP_CMD request. The response will
* be built in the buffer ioctx->buf points at and hence this function will
* overwrite the request data.
* @tag: tag of the request for which this response is being generated.
* @status: value for the STATUS field of the SRP_RSP information unit.
* @sense_data: pointer to sense data to be included in the response.
* @sense_data_len: length in bytes of the sense data.
*
* Returns the size in bytes of the SRP_RSP response.
*
* An SRP_RSP response contains a SCSI status or service response. See also
* section 6.9 in the SRP r16a document for the format of an SRP_RSP
* response. See also SPC-2 for more information about sense data.
*/
static int srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
struct srpt_send_ioctx *ioctx, u64 tag,
int status, const u8 *sense_data,
int sense_data_len)
{
struct srp_rsp *srp_rsp;
int max_sense_len;
/*
* The lowest bit of all SAM-3 status codes is zero (see also
* paragraph 5.3 in SAM-3).
*/
EXTRACHECKS_WARN_ON(status & 1);
srp_rsp = ioctx->ioctx.buf;
BUG_ON(!srp_rsp);
memset(srp_rsp, 0, sizeof *srp_rsp);
srp_rsp->opcode = SRP_RSP;
srp_rsp->req_lim_delta = cpu_to_be32(ioctx->req_lim_delta);
srp_rsp->tag = tag;
srp_rsp->status = status;
if (!SCST_SENSE_VALID(sense_data))
sense_data_len = 0;
else {
BUILD_BUG_ON(MIN_MAX_RSP_SIZE <= sizeof(*srp_rsp));
max_sense_len = ch->max_ti_iu_len - sizeof(*srp_rsp);
if (sense_data_len > max_sense_len) {
PRINT_WARNING("truncated sense data from %d to %d"
" bytes", sense_data_len, max_sense_len);
sense_data_len = max_sense_len;
}
srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;
srp_rsp->sense_data_len = cpu_to_be32(sense_data_len);
memcpy(srp_rsp + 1, sense_data, sense_data_len);
}
return sizeof(*srp_rsp) + sense_data_len;
}
/**
* srpt_build_tskmgmt_rsp() - Build a task management response.
* @ch: RDMA channel through which the request has been received.
* @ioctx: I/O context in which the SRP_RSP response will be built.
* @rsp_code: RSP_CODE that will be stored in the response.
* @tag: Tag of the request for which this response is being generated.
*
* Returns the size in bytes of the SRP_RSP response.
*
* An SRP_RSP response contains a SCSI status or service response. See also
* section 6.9 in the SRP r16a document for the format of an SRP_RSP
* response.
*/
static int srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch,
struct srpt_send_ioctx *ioctx,
u8 rsp_code, u64 tag)
{
struct srp_rsp *srp_rsp;
int resp_data_len;
int resp_len;
resp_data_len = (rsp_code == SRP_TSK_MGMT_SUCCESS) ? 0 : 4;
resp_len = sizeof(*srp_rsp) + resp_data_len;
srp_rsp = ioctx->ioctx.buf;
BUG_ON(!srp_rsp);
memset(srp_rsp, 0, sizeof *srp_rsp);
srp_rsp->opcode = SRP_RSP;
srp_rsp->req_lim_delta = cpu_to_be32(ioctx->req_lim_delta);
srp_rsp->tag = tag;
if (rsp_code != SRP_TSK_MGMT_SUCCESS) {
srp_rsp->flags |= SRP_RSP_FLAG_RSPVALID;
srp_rsp->resp_data_len = cpu_to_be32(resp_data_len);
srp_rsp->data[3] = rsp_code;
}
return resp_len;
}
/**
* srpt_handle_cmd() - Process SRP_CMD.
*/
static int srpt_handle_cmd(struct srpt_rdma_ch *ch,
struct srpt_recv_ioctx *recv_ioctx,
struct srpt_send_ioctx *send_ioctx,
enum scst_exec_context context)
{
struct scst_cmd *scmnd;
struct srp_cmd *srp_cmd;
scst_data_direction dir;
u64 data_len;
int ret;
int atomic;
BUG_ON(!send_ioctx);
srp_cmd = recv_ioctx->ioctx.buf;
atomic = context == SCST_CONTEXT_TASKLET ? SCST_ATOMIC
: SCST_NON_ATOMIC;
scmnd = scst_rx_cmd(ch->scst_sess, (u8 *) &srp_cmd->lun,
sizeof srp_cmd->lun, srp_cmd->cdb,
sizeof srp_cmd->cdb, atomic);
if (!scmnd) {
PRINT_ERROR("0x%llx: allocation of an SCST command failed",
srp_cmd->tag);
goto err;
}
send_ioctx->scmnd = scmnd;
ret = srpt_get_desc_tbl(send_ioctx, srp_cmd, &dir, &data_len);
if (ret) {
PRINT_ERROR("0x%llx: parsing SRP descriptor table failed.",
srp_cmd->tag);
scst_set_cmd_error(scmnd,
SCST_LOAD_SENSE(scst_sense_invalid_field_in_cdb));
}
switch (srp_cmd->task_attr) {
case SRP_CMD_HEAD_OF_Q:
scst_cmd_set_queue_type(scmnd, SCST_CMD_QUEUE_HEAD_OF_QUEUE);
break;
case SRP_CMD_ORDERED_Q:
scst_cmd_set_queue_type(scmnd, SCST_CMD_QUEUE_ORDERED);
break;
case SRP_CMD_SIMPLE_Q:
scst_cmd_set_queue_type(scmnd, SCST_CMD_QUEUE_SIMPLE);
break;
case SRP_CMD_ACA:
scst_cmd_set_queue_type(scmnd, SCST_CMD_QUEUE_ACA);
break;
default:
scst_cmd_set_queue_type(scmnd, SCST_CMD_QUEUE_ORDERED);
break;
}
scst_cmd_set_tag(scmnd, srp_cmd->tag);
scst_cmd_set_tgt_priv(scmnd, send_ioctx);
scst_cmd_set_expected(scmnd, dir, data_len);
scst_cmd_init_done(scmnd, context);
return 0;
err:
srpt_put_send_ioctx(send_ioctx);
return -1;
}
/**
* srpt_handle_tsk_mgmt() - Process an SRP_TSK_MGMT information unit.
*
* Returns SCST_MGMT_STATUS_SUCCESS upon success.
*
* Each task management function is performed by calling one of the
* scst_rx_mgmt_fn*() functions. These functions will either report failure
* or process the task management function asynchronously. The function
* srpt_tsk_mgmt_done() will be called by the SCST core upon completion of the
* task management function. When srpt_handle_tsk_mgmt() reports failure
* (i.e. returns -1) a response will have been built in ioctx->buf. This
* information unit has to be sent back by the caller.
*
* For more information about SRP_TSK_MGMT information units, see also section
* 6.7 in the SRP r16a document.
*/
static u8 srpt_handle_tsk_mgmt(struct srpt_rdma_ch *ch,
struct srpt_recv_ioctx *recv_ioctx,
struct srpt_send_ioctx *send_ioctx)
{
struct srp_tsk_mgmt *srp_tsk;
int ret;
ret = SCST_MGMT_STATUS_FAILED;
BUG_ON(!send_ioctx);
BUG_ON(send_ioctx->ch != ch);
srpt_set_cmd_state(send_ioctx, SRPT_STATE_MGMT);
srp_tsk = recv_ioctx->ioctx.buf;
TRACE_DBG("recv_tsk_mgmt= %d for task_tag= %lld"
" using tag= %lld cm_id= %p sess= %p",
srp_tsk->tsk_mgmt_func, srp_tsk->task_tag, srp_tsk->tag,
ch->cm_id, ch->scst_sess);
send_ioctx->tsk_mgmt.tag = srp_tsk->tag;
switch (srp_tsk->tsk_mgmt_func) {
case SRP_TSK_ABORT_TASK:
TRACE_DBG("Processing SRP_TSK_ABORT_TASK");
ret = scst_rx_mgmt_fn_tag(ch->scst_sess, SCST_ABORT_TASK,
srp_tsk->task_tag,
SCST_ATOMIC, send_ioctx);
break;
case SRP_TSK_ABORT_TASK_SET:
TRACE_DBG("Processing SRP_TSK_ABORT_TASK_SET");
ret = scst_rx_mgmt_fn_lun(ch->scst_sess, SCST_ABORT_TASK_SET,
&srp_tsk->lun, sizeof(srp_tsk->lun),
SCST_ATOMIC, send_ioctx);
break;
case SRP_TSK_CLEAR_TASK_SET:
TRACE_DBG("Processing SRP_TSK_CLEAR_TASK_SET");
ret = scst_rx_mgmt_fn_lun(ch->scst_sess, SCST_CLEAR_TASK_SET,
&srp_tsk->lun, sizeof(srp_tsk->lun),
SCST_ATOMIC, send_ioctx);
break;
case SRP_TSK_LUN_RESET:
TRACE_DBG("Processing SRP_TSK_LUN_RESET");
ret = scst_rx_mgmt_fn_lun(ch->scst_sess, SCST_LUN_RESET,
&srp_tsk->lun, sizeof(srp_tsk->lun),
SCST_ATOMIC, send_ioctx);
break;
case SRP_TSK_CLEAR_ACA:
TRACE_DBG("Processing SRP_TSK_CLEAR_ACA");
ret = scst_rx_mgmt_fn_lun(ch->scst_sess, SCST_CLEAR_ACA,
&srp_tsk->lun, sizeof(srp_tsk->lun),
SCST_ATOMIC, send_ioctx);
break;
default:
TRACE_DBG("Unsupported task management function.");
ret = SCST_MGMT_STATUS_FN_NOT_SUPPORTED;
}
if (ret != SCST_MGMT_STATUS_SUCCESS)
srpt_put_send_ioctx(send_ioctx);
return ret;
}
static u8 scst_to_srp_tsk_mgmt_status(const int scst_mgmt_status)
{
switch (scst_mgmt_status) {
case SCST_MGMT_STATUS_SUCCESS:
return SRP_TSK_MGMT_SUCCESS;
case SCST_MGMT_STATUS_FN_NOT_SUPPORTED:
return SRP_TSK_MGMT_FUNC_NOT_SUPP;
case SCST_MGMT_STATUS_TASK_NOT_EXIST:
case SCST_MGMT_STATUS_LUN_NOT_EXIST:
case SCST_MGMT_STATUS_REJECTED:
case SCST_MGMT_STATUS_FAILED:
default:
break;
}
return SRP_TSK_MGMT_FAILED;
}
/**
* srpt_handle_new_iu() - Process a newly received information unit.
* @ch: RDMA channel through which the information unit has been received.
* @ioctx: SRPT I/O context associated with the information unit.
*/
static void srpt_handle_new_iu(struct srpt_rdma_ch *ch,
struct srpt_recv_ioctx *recv_ioctx,
struct srpt_send_ioctx *send_ioctx,
enum scst_exec_context context)
{
struct srp_cmd *srp_cmd;
BUG_ON(!ch);
BUG_ON(!recv_ioctx);
ib_dma_sync_single_for_cpu(ch->sport->sdev->device,
recv_ioctx->ioctx.dma, srp_max_req_size,
DMA_FROM_DEVICE);
srp_cmd = recv_ioctx->ioctx.buf;
if (unlikely(!ch->rtu_received)) {
list_add_tail(&recv_ioctx->wait_list, &ch->cmd_wait_list);
goto out;
}
if (srp_cmd->opcode == SRP_CMD || srp_cmd->opcode == SRP_TSK_MGMT) {
if (!send_ioctx)
send_ioctx = srpt_get_send_ioctx(ch);
if (unlikely(!send_ioctx)) {
list_add_tail(&recv_ioctx->wait_list,
&ch->cmd_wait_list);
goto out;
}
}
switch (srp_cmd->opcode) {
case SRP_CMD:
srpt_handle_cmd(ch, recv_ioctx, send_ioctx, context);
break;
case SRP_TSK_MGMT:
srpt_handle_tsk_mgmt(ch, recv_ioctx, send_ioctx);
break;
case SRP_I_LOGOUT:
PRINT_ERROR("Not yet implemented: SRP_I_LOGOUT");
break;
case SRP_CRED_RSP:
TRACE_DBG("received SRP_CRED_RSP");
break;
case SRP_AER_RSP:
TRACE_DBG("received SRP_AER_RSP");
break;
case SRP_RSP:
PRINT_ERROR("Received SRP_RSP");
break;
default:
PRINT_ERROR("received IU with unknown opcode 0x%x",
srp_cmd->opcode);
break;
}
srpt_post_recv(ch->sport->sdev, recv_ioctx);
out:
return;
}
static void srpt_process_rcv_completion(struct ib_cq *cq,
struct srpt_rdma_ch *ch,
enum scst_exec_context context,
struct ib_wc *wc)
{
struct srpt_device *sdev = ch->sport->sdev;
struct srpt_recv_ioctx *ioctx;
u32 index;
index = idx_from_wr_id(wc->wr_id);
if (wc->status == IB_WC_SUCCESS) {
int req_lim;
req_lim = srpt_adjust_req_lim(ch, -1, 0);
if (unlikely(req_lim < 0))
PRINT_ERROR("req_lim = %d < 0", req_lim);
ioctx = sdev->ioctx_ring[index];
srpt_handle_new_iu(ch, ioctx, NULL, context);
} else {
PRINT_INFO("receiving failed for idx %u with status %d",
index, wc->status);
}
}
static void srpt_process_wait_list(struct srpt_rdma_ch *ch,
enum scst_exec_context context)
{
struct srpt_recv_ioctx *recv_ioctx, *tmp;
struct srpt_send_ioctx *send_ioctx;
list_for_each_entry_safe(recv_ioctx, tmp, &ch->cmd_wait_list,
wait_list) {
send_ioctx = srpt_get_send_ioctx(ch);
if (!send_ioctx)
break;
list_del(&recv_ioctx->wait_list);
srpt_handle_new_iu(ch, recv_ioctx, send_ioctx, context);
}
}
/**
* srpt_process_send_completion() - Process an IB send completion.
*
* Note: Although this has not yet been observed during tests, at least in
* theory it is possible that the srpt_get_send_ioctx() call invoked by
* srpt_handle_new_iu() fails. This is possible because the req_lim_delta
* value in each response is set to at least one, and it is possible that this
* response makes the initiator send a new request before the send completion
* for that response has been processed. This could e.g. happen if the call to
* srpt_put_send_iotcx() is delayed because of a higher priority interrupt or
* if IB retransmission causes generation of the send completion to be
* delayed. Incoming information units for which srpt_get_send_ioctx() fails
* are queued on cmd_wait_list. The code below processes these delayed
* requests one at a time.
*/
static void srpt_process_send_completion(struct ib_cq *cq,
struct srpt_rdma_ch *ch,
enum scst_exec_context context,
struct ib_wc *wc)
{
struct srpt_send_ioctx *send_ioctx;
uint32_t index;
enum srpt_opcode opcode;
index = idx_from_wr_id(wc->wr_id);
opcode = opcode_from_wr_id(wc->wr_id);
send_ioctx = ch->ioctx_ring[index];
if (wc->status == IB_WC_SUCCESS) {
if (opcode == SRPT_SEND)
srpt_handle_send_comp(ch, send_ioctx, context);
else {
EXTRACHECKS_WARN_ON(opcode != SRPT_RDMA_ABORT &&
wc->opcode != IB_WC_RDMA_READ);
srpt_handle_rdma_comp(ch, send_ioctx, opcode, context);
}
} else {
if (opcode == SRPT_SEND) {
PRINT_INFO("sending response for idx %u failed with"
" status %d", index, wc->status);
srpt_handle_send_err_comp(ch, wc->wr_id, context);
} else if (opcode != SRPT_RDMA_MID) {
PRINT_INFO("RDMA t %d for idx %u failed with status %d",
opcode, index, wc->status);
srpt_handle_rdma_err_comp(ch, send_ioctx, opcode,
context);
}
}
if (unlikely(opcode == SRPT_SEND &&
ch->rtu_received &&
!list_empty(&ch->cmd_wait_list)))
srpt_process_wait_list(ch, context);
}
static void srpt_process_completion(struct ib_cq *cq,
struct srpt_rdma_ch *ch,
enum scst_exec_context rcv_context,
enum scst_exec_context send_context)
{
struct ib_wc *const wc = ch->wc;
int i, n;
EXTRACHECKS_WARN_ON(cq != ch->cq);
ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
while ((n = ib_poll_cq(cq, ARRAY_SIZE(ch->wc), wc)) > 0) {
for (i = 0; i < n; i++) {
if (opcode_from_wr_id(wc[i].wr_id) == SRPT_RECV)
srpt_process_rcv_completion(cq, ch, rcv_context,
&wc[i]);
else
srpt_process_send_completion(cq, ch,
send_context,
&wc[i]);
}
}
}
/**
* srpt_completion() - IB completion queue callback function.
*/
static void srpt_completion(struct ib_cq *cq, void *ctx)
{
struct srpt_rdma_ch *ch = ctx;
BUG_ON(!ch->thread);
wake_up_process(ch->thread);
}
static int srpt_compl_thread(void *arg)
{
struct srpt_rdma_ch *ch;
struct srpt_device *sdev;
/* Hibernation / freezing of the SRPT kernel thread is not supported. */
current->flags |= PF_NOFREEZE;
ch = arg;
BUG_ON(!ch);
set_current_state(TASK_INTERRUPTIBLE);
#if defined(__GNUC__) && ((__GNUC__ -0) * 100 + __GNUC_MINOR__ -0) <= 406
/* See also http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52925. */
barrier();
#endif
while (ch->state < CH_LIVE) {
srpt_process_completion(ch->cq, ch, SCST_CONTEXT_THREAD,
SCST_CONTEXT_DIRECT);
schedule();
set_current_state(TASK_INTERRUPTIBLE);
}
set_current_state(TASK_RUNNING);
srpt_process_wait_list(ch, SCST_CONTEXT_THREAD);
ch->rtu_received = true;
set_current_state(TASK_INTERRUPTIBLE);
#if defined(__GNUC__) && ((__GNUC__ -0) * 100 + __GNUC_MINOR__ -0) <= 406
/* See also http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52925. */
barrier();
#endif
while (!ch->last_wqe_received) {
srpt_process_completion(ch->cq, ch, SCST_CONTEXT_THREAD,
SCST_CONTEXT_DIRECT);
schedule();
set_current_state(TASK_INTERRUPTIBLE);
}
set_current_state(TASK_RUNNING);
/*
* Process all IB (error) completions before invoking
* scst_unregister_session().
*/
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
srpt_process_completion(ch->cq, ch, SCST_CONTEXT_THREAD,
SCST_CONTEXT_DIRECT);
if (atomic_read(&ch->scst_sess->sess_cmd_count) == 0)
break;
schedule_timeout(HZ / 10);
}
set_current_state(TASK_RUNNING);
TRACE_DBG("ch %s: about to invoke scst_unregister_session()",
ch->sess_name);
scst_unregister_session(ch->scst_sess, true, NULL);
sdev = ch->sport->sdev;
srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
sdev, ch->rq_size,
ch->max_rsp_size, DMA_TO_DEVICE);
spin_lock_irq(&sdev->spinlock);
list_del(&ch->list);
spin_unlock_irq(&sdev->spinlock);
ib_destroy_cm_id(ch->cm_id);
/*
* The function call below will wait for the completion handler
* callback to finish and hence ensures that wake_up_process() won't
* be invoked anymore from that callback for the current thread.
*/
srpt_destroy_ch_ib(ch);
kfree(ch);
ch = NULL;
wake_up(&sdev->ch_releaseQ);
return 0;
}
/**
* srpt_create_ch_ib() - Create receive and send completion queues.
*/
static int srpt_create_ch_ib(struct srpt_rdma_ch *ch)
{
struct ib_qp_init_attr *qp_init;
struct srpt_device *sdev = ch->sport->sdev;
int ret;
EXTRACHECKS_WARN_ON(ch->rq_size < 1);
ret = -ENOMEM;
qp_init = kzalloc(sizeof *qp_init, GFP_KERNEL);
if (!qp_init)
goto out;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) \
&& !defined(RHEL_RELEASE_CODE)
ch->cq = ib_create_cq(sdev->device, srpt_completion, NULL, ch,
ch->rq_size + srpt_sq_size);
#else
ch->cq = ib_create_cq(sdev->device, srpt_completion, NULL, ch,
ch->rq_size + srpt_sq_size, 0);
#endif
if (IS_ERR(ch->cq)) {
ret = PTR_ERR(ch->cq);
PRINT_ERROR("failed to create CQ cqe= %d ret= %d",
ch->rq_size + srpt_sq_size, ret);
goto out;
}
qp_init->qp_context = (void *)ch;
qp_init->event_handler
= (void(*)(struct ib_event *, void*))srpt_qp_event;
qp_init->send_cq = ch->cq;
qp_init->recv_cq = ch->cq;
qp_init->srq = sdev->srq;
qp_init->sq_sig_type = IB_SIGNAL_REQ_WR;
qp_init->qp_type = IB_QPT_RC;
qp_init->cap.max_send_wr = srpt_sq_size;
/*
* A quote from the OFED 1.5.3.1 release notes
* (docs/release_notes/mthca_release_notes.txt), section "Known Issues":
* In mem-free devices, RC QPs can be created with a maximum of
* (max_sge - 1) entries only; UD QPs can be created with a maximum of
* (max_sge - 3) entries.
* A quote from the OFED 1.2.5 release notes
* (docs/mthca_release_notes.txt), section "Known Issues":
* In mem-free devices, RC QPs can be created with a maximum of
* (max_sge - 3) entries only.
*/
ch->max_sge = sdev->dev_attr.max_sge - 3;
WARN_ON(ch->max_sge < 1);
qp_init->cap.max_send_sge = ch->max_sge;
ch->qp = ib_create_qp(sdev->pd, qp_init);
if (IS_ERR(ch->qp)) {
ret = PTR_ERR(ch->qp);
PRINT_ERROR("failed to create_qp ret= %d", ret);
goto err_destroy_cq;
}
TRACE_DBG("qp_num = %#x", ch->qp->qp_num);
ch->sq_wr_avail = qp_init->cap.max_send_wr;
TRACE_DBG("%s: max_cqe= %d max_sge= %d sq_size = %d"
" cm_id= %p", __func__, ch->cq->cqe,
qp_init->cap.max_send_sge, qp_init->cap.max_send_wr,
ch->cm_id);
ret = srpt_init_ch_qp(ch, ch->qp);
if (ret) {
PRINT_ERROR("srpt_init_ch_qp(%#x) failed (%d)", ch->qp->qp_num,
ret);
goto err_destroy_qp;
}
out:
kfree(qp_init);
return ret;
err_destroy_qp:
ib_destroy_qp(ch->qp);
err_destroy_cq:
ib_destroy_cq(ch->cq);
goto out;
}
static void srpt_destroy_ch_ib(struct srpt_rdma_ch *ch)
{
TRACE_ENTRY();
while (ib_poll_cq(ch->cq, ARRAY_SIZE(ch->wc), ch->wc) > 0)
;
ib_destroy_qp(ch->qp);
ib_destroy_cq(ch->cq);
TRACE_EXIT();
}
/**
* __srpt_close_ch() - Close an RDMA channel by setting the QP error state.
*
* Reset the QP and make sure all resources associated with the channel will
* be deallocated at an appropriate time.
*
* Returns true if and only if the channel state has been modified from
* CH_CONNECTING or CH_LIVE into CH_DISCONNECTING.
*
* Note: The caller must hold ch->sport->sdev->spinlock.
*/
static bool __srpt_close_ch(struct srpt_rdma_ch *ch)
{
struct srpt_device *sdev;
enum rdma_ch_state prev_state;
bool was_live;
BUG_ON(!ch->cm_id);
sdev = ch->sport->sdev;
was_live = false;
prev_state = srpt_set_ch_state_to_disc(ch);
switch (prev_state) {
case CH_CONNECTING:
ib_send_cm_rej(ch->cm_id, IB_CM_REJ_NO_RESOURCES, NULL, 0,
NULL, 0);
/* fall through */
case CH_LIVE:
was_live = true;
if (ib_send_cm_dreq(ch->cm_id, NULL, 0) < 0)
PRINT_ERROR("sending CM DREQ failed.");
break;
case CH_DISCONNECTING:
case CH_DRAINING:
break;
}
return was_live;
}
/**
* srpt_close_ch() - Close an RDMA channel.
*/
static void srpt_close_ch(struct srpt_rdma_ch *ch)
{
struct srpt_device *sdev;
sdev = ch->sport->sdev;
spin_lock_irq(&sdev->spinlock);
__srpt_close_ch(ch);
spin_unlock_irq(&sdev->spinlock);
}
/**
* srpt_drain_channel() - Drain a channel by resetting the IB queue pair.
* @cm_id: Pointer to the CM ID of the channel to be drained.
*
* Note: Must be called from inside srpt_cm_handler to avoid a race between
* accessing sdev->spinlock and the call to kfree(sdev) in srpt_remove_one()
* (the caller of srpt_cm_handler holds the cm_id spinlock; srpt_remove_one()
* waits until all target sessions for the associated IB device have been
* unregistered and target session registration involves a call to
* ib_destroy_cm_id(), which locks the cm_id spinlock and hence waits until
* this function has finished).
*/
static void srpt_drain_channel(struct ib_cm_id *cm_id)
{
struct srpt_rdma_ch *ch;
int ret;
WARN_ON_ONCE(irqs_disabled());
ch = cm_id->context;
if (srpt_set_ch_state_to_draining(ch)) {
ret = srpt_ch_qp_err(ch);
if (ret < 0)
PRINT_ERROR("Setting queue pair in error state"
" failed: %d", ret);
}
}
#if !defined(CONFIG_SCST_PROC)
/**
* srpt_enable_target() - Allows to enable a target via sysfs.
*/
static int srpt_enable_target(struct scst_tgt *scst_tgt, bool enable)
{
struct srpt_device *sdev = scst_tgt_get_tgt_priv(scst_tgt);
EXTRACHECKS_WARN_ON_ONCE(irqs_disabled());
if (!sdev)
return -ENOENT;
TRACE_DBG("%s target %s", enable ? "Enabling" : "Disabling",
sdev->device->name);
spin_lock_irq(&sdev->spinlock);
sdev->enabled = enable;
if (!enable) {
struct srpt_rdma_ch *ch;
list_for_each_entry(ch, &sdev->rch_list, list) {
PRINT_INFO("Closing channel %s (cm_id %p)"
" because target %s has been disabled",
ch->sess_name, ch->cm_id,
sdev->device->name);
__srpt_close_ch(ch);
}
}
spin_unlock_irq(&sdev->spinlock);
return 0;
}
/**
* srpt_is_target_enabled() - Allows to query a targets status via sysfs.
*/
static bool srpt_is_target_enabled(struct scst_tgt *scst_tgt)
{
struct srpt_device *sdev = scst_tgt_get_tgt_priv(scst_tgt);
bool res;
EXTRACHECKS_WARN_ON_ONCE(irqs_disabled());
if (!sdev)
return false;
spin_lock_irq(&sdev->spinlock);
res = sdev->enabled;
spin_unlock_irq(&sdev->spinlock);
return res;
}
#else
/**
* srpt_is_target_enabled() - Reports that a target is enabled when using procfs.
*/
static bool srpt_is_target_enabled(struct scst_tgt *scst_tgt)
{
return true;
}
#endif
/**
* srpt_cm_req_recv() - Process the event IB_CM_REQ_RECEIVED.
*
* Ownership of the cm_id is transferred to the SCST session if this function
* returns zero. Otherwise the caller remains the owner of cm_id.
*/
static int srpt_cm_req_recv(struct ib_cm_id *cm_id,
struct ib_cm_req_event_param *param,
void *private_data)
{
struct srpt_device *sdev = cm_id->context;
struct srp_login_req *req;
struct srp_login_rsp *rsp;
struct srp_login_rej *rej;
struct ib_cm_rep_param *rep_param;
struct srpt_rdma_ch *ch;
struct task_struct *thread;
u32 it_iu_len;
int i;
int ret = 0;
EXTRACHECKS_WARN_ON_ONCE(irqs_disabled());
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18)
WARN_ON(!sdev || !private_data);
if (!sdev || !private_data)
return -EINVAL;
#else
if (WARN_ON(!sdev || !private_data))
return -EINVAL;
#endif
req = (struct srp_login_req *)private_data;
it_iu_len = be32_to_cpu(req->req_it_iu_len);
PRINT_INFO("Received SRP_LOGIN_REQ with"
" i_port_id 0x%llx:0x%llx, t_port_id 0x%llx:0x%llx and it_iu_len %d"
" on port %d (guid=0x%llx:0x%llx)",
be64_to_cpu(*(__be64 *)&req->initiator_port_id[0]),
be64_to_cpu(*(__be64 *)&req->initiator_port_id[8]),
be64_to_cpu(*(__be64 *)&req->target_port_id[0]),
be64_to_cpu(*(__be64 *)&req->target_port_id[8]),
it_iu_len,
param->port,
be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[0]),
be64_to_cpu(*(__be64 *)&sdev->port[param->port - 1].gid.raw[8]));
rsp = kzalloc(sizeof *rsp, GFP_KERNEL);
rej = kzalloc(sizeof *rej, GFP_KERNEL);
rep_param = kzalloc(sizeof *rep_param, GFP_KERNEL);
if (!rsp || !rej || !rep_param) {
ret = -ENOMEM;
goto out;
}
if (it_iu_len > srp_max_req_size || it_iu_len < 64) {
rej->reason = cpu_to_be32(
SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE);
ret = -EINVAL;
PRINT_ERROR("rejected SRP_LOGIN_REQ because its"
" length (%d bytes) is out of range (%d .. %d)",
it_iu_len, 64, srp_max_req_size);
goto reject;
}
if (!srpt_is_target_enabled(sdev->scst_tgt)) {
rej->reason = cpu_to_be32(
SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
ret = -EINVAL;
PRINT_ERROR("rejected SRP_LOGIN_REQ because the target %s (%s)"
" has not yet been enabled",
sdev->scst_tgt->tgt_name, sdev->device->name);
goto reject;
}
if (*(__be64 *)req->target_port_id != cpu_to_be64(srpt_service_guid)
|| *(__be64 *)(req->target_port_id + 8) !=
cpu_to_be64(srpt_service_guid)) {
rej->reason = cpu_to_be32(
SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL);
ret = -ENOMEM;
PRINT_ERROR("rejected SRP_LOGIN_REQ because it"
" has an invalid target port identifier.");
goto reject;
}
ch = kzalloc(sizeof *ch, GFP_KERNEL);
if (!ch) {
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
PRINT_ERROR("rejected SRP_LOGIN_REQ because out of memory.");
ret = -ENOMEM;
goto reject;
}
memcpy(ch->i_port_id, req->initiator_port_id, 16);
memcpy(ch->t_port_id, req->target_port_id, 16);
ch->sport = &sdev->port[param->port - 1];
ch->cm_id = cm_id;
cm_id->context = ch;
/*
* Avoid QUEUE_FULL conditions by limiting the number of buffers used
* for the SRP protocol to the SCST SCSI command queue size.
*/
ch->rq_size = min(SRPT_RQ_SIZE, scst_get_max_lun_commands(NULL, 0));
spin_lock_init(&ch->spinlock);
ch->state = CH_CONNECTING;
INIT_LIST_HEAD(&ch->cmd_wait_list);
init_waitqueue_head(&ch->state_wq);
ch->max_rsp_size = max_t(uint32_t, srp_max_rsp_size, MIN_MAX_RSP_SIZE);
ch->ioctx_ring = (struct srpt_send_ioctx **)
srpt_alloc_ioctx_ring(ch->sport->sdev, ch->rq_size,
sizeof(*ch->ioctx_ring[0]),
ch->max_rsp_size, DMA_TO_DEVICE);
if (!ch->ioctx_ring) {
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
goto free_ch;
}
INIT_LIST_HEAD(&ch->free_list);
for (i = 0; i < ch->rq_size; i++) {
ch->ioctx_ring[i]->ch = ch;
list_add_tail(&ch->ioctx_ring[i]->free_list, &ch->free_list);
}
ret = srpt_create_ch_ib(ch);
if (ret) {
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
PRINT_ERROR("rejected SRP_LOGIN_REQ because creating"
" a new RDMA channel failed.");
goto free_ring;
}
if (use_port_guid_in_session_name) {
/*
* If the kernel module parameter use_port_guid_in_session_name
* has been specified, use a combination of the target port
* GUID and the initiator port ID as the session name. This
* was the original behavior of the SRP target implementation
* (i.e. before the SRPT was included in OFED 1.3).
*/
snprintf(ch->sess_name, sizeof(ch->sess_name),
"0x%016llx%016llx",
be64_to_cpu(*(__be64 *)
&sdev->port[param->port - 1].gid.raw[8]),
be64_to_cpu(*(__be64 *)(ch->i_port_id + 8)));
} else {
/*
* Default behavior: use the initator port identifier as the
* session name.
*/
snprintf(ch->sess_name, sizeof(ch->sess_name),
"0x%016llx%016llx",
be64_to_cpu(*(__be64 *)ch->i_port_id),
be64_to_cpu(*(__be64 *)(ch->i_port_id + 8)));
}
TRACE_DBG("registering session %s", ch->sess_name);
BUG_ON(!sdev->scst_tgt);
ch->scst_sess = scst_register_session(sdev->scst_tgt, 0, ch->sess_name,
ch, NULL, NULL);
if (!ch->scst_sess) {
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
TRACE_DBG("Failed to create SCST session");
goto destroy_ib;
}
thread = kthread_run(srpt_compl_thread, ch, "srpt_%s",
ch->sport->sdev->device->name);
if (IS_ERR(thread)) {
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
PRINT_ERROR("failed to create kernel thread %ld", PTR_ERR(ch->thread));
goto unreg_ch;
}
spin_lock_irq(&sdev->spinlock);
if ((req->req_flags & SRP_MTCH_ACTION) == SRP_MULTICHAN_SINGLE) {
struct srpt_rdma_ch *ch2;
rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN;
list_for_each_entry(ch2, &sdev->rch_list, list) {
if (!memcmp(ch2->i_port_id, req->initiator_port_id, 16)
&& !memcmp(ch2->t_port_id, req->target_port_id, 16)
&& param->port == ch2->sport->port
&& param->listen_id == ch2->sport->sdev->cm_id) {
if (!__srpt_close_ch(ch2))
continue;
PRINT_INFO("Relogin - closed existing channel"
" %s; cm_id = %p", ch2->sess_name,
ch2->cm_id);
rsp->rsp_flags =
SRP_LOGIN_RSP_MULTICHAN_TERMINATED;
}
}
} else {
rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED;
}
list_add_tail(&ch->list, &sdev->rch_list);
ch->thread = thread;
spin_unlock_irq(&sdev->spinlock);
ret = srpt_ch_qp_rtr(ch, ch->qp);
if (ret) {
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
PRINT_ERROR("rejected SRP_LOGIN_REQ because enabling"
" RTR failed (error code = %d)", ret);
goto reject_and_release;
}
TRACE_DBG("Establish connection sess=%p name=%s cm_id=%p",
ch->scst_sess, ch->sess_name, ch->cm_id);
/* create srp_login_response */
rsp->opcode = SRP_LOGIN_RSP;
rsp->tag = req->tag;
rsp->max_it_iu_len = req->req_it_iu_len;
rsp->max_ti_iu_len = req->req_it_iu_len;
ch->max_ti_iu_len = it_iu_len;
rsp->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
SRP_BUF_FORMAT_INDIRECT);
rsp->req_lim_delta = cpu_to_be32(ch->rq_size);
ch->req_lim = ch->rq_size;
ch->req_lim_delta = 0;
/* create cm reply */
rep_param->qp_num = ch->qp->qp_num;
rep_param->private_data = (void *)rsp;
rep_param->private_data_len = sizeof *rsp;
rep_param->rnr_retry_count = 7;
rep_param->flow_control = 1;
rep_param->failover_accepted = 0;
rep_param->srq = 1;
rep_param->responder_resources = 4;
rep_param->initiator_depth = 4;
spin_lock_irq(&sdev->spinlock);
if (ch->state == CH_CONNECTING)
ret = ib_send_cm_rep(cm_id, rep_param);
else
ret = -ECONNABORTED;
spin_unlock_irq(&sdev->spinlock);
switch (ret) {
case 0:
break;
case -ECONNABORTED:
goto out_keep_cm_id;
default:
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
PRINT_ERROR("sending SRP_LOGIN_REQ response failed"
" (error code = %d)", ret);
goto reject_and_release;
}
goto out;
reject_and_release:
PRINT_INFO("Rejecting login with reason %#x", be32_to_cpu(rej->reason));
rej->opcode = SRP_LOGIN_REJ;
rej->tag = req->tag;
rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
SRP_BUF_FORMAT_INDIRECT);
ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
(void *)rej, sizeof *rej);
srpt_close_ch(ch);
out_keep_cm_id:
/*
* Tell the caller not to free cm_id since srpt_compl_thread() will do
* that.
*/
ret = 0;
goto out;
unreg_ch:
scst_unregister_session(ch->scst_sess, true, NULL);
destroy_ib:
srpt_destroy_ch_ib(ch);
free_ring:
srpt_free_ioctx_ring((struct srpt_ioctx **)ch->ioctx_ring,
ch->sport->sdev, ch->rq_size,
ch->max_rsp_size, DMA_TO_DEVICE);
free_ch:
cm_id->context = NULL;
kfree(ch);
reject:
PRINT_INFO("Rejecting login with reason %#x", be32_to_cpu(rej->reason));
rej->opcode = SRP_LOGIN_REJ;
rej->tag = req->tag;
rej->buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
SRP_BUF_FORMAT_INDIRECT);
ib_send_cm_rej(cm_id, IB_CM_REJ_CONSUMER_DEFINED, NULL, 0,
(void *)rej, sizeof *rej);
out:
kfree(rep_param);
kfree(rsp);
kfree(rej);
return ret;
}
static void srpt_cm_rej_recv(struct ib_cm_id *cm_id)
{
PRINT_INFO("Received InfiniBand REJ packet for cm_id %p.", cm_id);
srpt_drain_channel(cm_id);
}
/**
* srpt_cm_rtu_recv() - Process IB CM RTU_RECEIVED and USER_ESTABLISHED events.
*
* An IB_CM_RTU_RECEIVED message indicates that the connection is established
* and that the recipient may begin transmitting (RTU = ready to use).
*/
static void srpt_cm_rtu_recv(struct ib_cm_id *cm_id)
{
struct srpt_rdma_ch *ch;
int ret;
ch = cm_id->context;
BUG_ON(!ch);
if (srpt_test_and_set_ch_state(ch, CH_CONNECTING, CH_LIVE)) {
ret = srpt_ch_qp_rts(ch, ch->qp);
if (ret)
srpt_close_ch(ch);
}
}
static void srpt_cm_timewait_exit(struct ib_cm_id *cm_id)
{
PRINT_INFO("Received InfiniBand TimeWait exit for cm_id %p.", cm_id);
srpt_drain_channel(cm_id);
}
static void srpt_cm_rep_error(struct ib_cm_id *cm_id)
{
PRINT_INFO("Received InfiniBand REP error for cm_id %p.", cm_id);
srpt_drain_channel(cm_id);
}
/**
* srpt_cm_dreq_recv() - Process reception of a DREQ message.
*/
static void srpt_cm_dreq_recv(struct ib_cm_id *cm_id)
{
struct srpt_rdma_ch *ch;
ch = cm_id->context;
switch (srpt_set_ch_state_to_disc(ch)) {
case CH_CONNECTING:
case CH_LIVE:
if (ib_send_cm_drep(ch->cm_id, NULL, 0) >= 0)
PRINT_INFO("Received DREQ and sent DREP for session %s",
ch->sess_name);
else
PRINT_ERROR("Sending DREP failed");
break;
default:
WARN_ON(true);
break;
}
}
/**
* srpt_cm_drep_recv() - Process reception of a DREP message.
*/
static void srpt_cm_drep_recv(struct ib_cm_id *cm_id)
{
PRINT_INFO("Received InfiniBand DREP message for cm_id %p.", cm_id);
srpt_drain_channel(cm_id);
}
/**
* srpt_cm_handler() - IB connection manager callback function.
*
* A non-zero return value will cause the caller destroy the CM ID.
*
* Note: srpt_cm_handler() must only return a non-zero value when transferring
* ownership of the cm_id to a channel if srpt_cm_req_recv() failed. Returning
* a non-zero value in any other case will trigger a race with the
* ib_destroy_cm_id() call in srpt_compl_thread().
*/
static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
{
int ret;
BUG_ON(!cm_id->context);
ret = 0;
switch (event->event) {
case IB_CM_REQ_RECEIVED:
ret = srpt_cm_req_recv(cm_id, &event->param.req_rcvd,
event->private_data);
break;
case IB_CM_REJ_RECEIVED:
srpt_cm_rej_recv(cm_id);
break;
case IB_CM_RTU_RECEIVED:
case IB_CM_USER_ESTABLISHED:
srpt_cm_rtu_recv(cm_id);
break;
case IB_CM_DREQ_RECEIVED:
srpt_cm_dreq_recv(cm_id);
break;
case IB_CM_DREP_RECEIVED:
srpt_cm_drep_recv(cm_id);
break;
case IB_CM_TIMEWAIT_EXIT:
srpt_cm_timewait_exit(cm_id);
break;
case IB_CM_REP_ERROR:
srpt_cm_rep_error(cm_id);
break;
case IB_CM_DREQ_ERROR:
PRINT_INFO("Received IB DREQ ERROR event.");
break;
case IB_CM_MRA_RECEIVED:
PRINT_INFO("Received IB MRA event");
break;
default:
PRINT_ERROR("received unrecognized IB CM event %d",
event->event);
break;
}
return ret;
}
/**
* srpt_map_sg_to_ib_sge() - Map an SG list to an IB SGE list.
*/
static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch,
struct srpt_send_ioctx *ioctx,
struct scst_cmd *scmnd)
{
struct scatterlist *sg;
int sg_cnt;
scst_data_direction dir;
struct rdma_iu *riu;
struct srp_direct_buf *db;
dma_addr_t dma_addr;
struct ib_sge *sge_array, *sge;
u64 raddr;
u32 rsize;
u32 tsize;
u32 dma_len;
int count;
int i, j, k;
int max_sge, nsge;
BUG_ON(!ch);
BUG_ON(!ioctx);
BUG_ON(!scmnd);
max_sge = ch->max_sge;
dir = scst_cmd_get_data_direction(scmnd);
BUG_ON(dir == SCST_DATA_NONE);
/*
* Cache 'dir' because it is needed in srpt_unmap_sg_to_ib_sge()
* and because scst_set_cmd_error_status() resets scmnd->data_direction.
*/
ioctx->dir = dir;
if (dir == SCST_DATA_WRITE) {
scst_cmd_get_write_fields(scmnd, &sg, &sg_cnt);
WARN_ON(!sg);
} else {
sg = scst_cmd_get_sg(scmnd);
sg_cnt = scst_cmd_get_sg_cnt(scmnd);
WARN_ON(!sg);
}
ioctx->sg = sg;
ioctx->sg_cnt = sg_cnt;
count = ib_dma_map_sg(ch->sport->sdev->device, sg, sg_cnt,
scst_to_tgt_dma_dir(dir));
if (unlikely(!count))
return -EBUSY;
ioctx->mapped_sg_count = count;
{
int size, nrdma;
nrdma = (count + max_sge - 1) / max_sge + ioctx->n_rbuf;
nsge = count + ioctx->n_rbuf;
size = nrdma * sizeof(*riu) + nsge * sizeof(*sge);
ioctx->rdma_ius = size <= sizeof(ioctx->rdma_ius_buf) ?
ioctx->rdma_ius_buf : kmalloc(size,
scst_cmd_atomic(scmnd) ? GFP_ATOMIC : GFP_KERNEL);
if (!ioctx->rdma_ius)
goto free_mem;
ioctx->n_rdma_ius = nrdma;
sge_array = (struct ib_sge *)(ioctx->rdma_ius + nrdma);
}
db = ioctx->rbufs;
tsize = (dir == SCST_DATA_READ)
? scst_cmd_get_adjusted_resp_data_len(scmnd)
: scst_cmd_get_bufflen(scmnd);
dma_len = sg_dma_len(&sg[0]);
riu = ioctx->rdma_ius;
sge = sge_array;
/*
* For each remote desc - calculate the #ib_sge.
* If #ib_sge < SRPT_DEF_SG_PER_WQE per rdma operation then
* each remote desc rdma_iu is required a rdma wr;
* else
* we need to allocate extra rdma_iu to carry extra #ib_sge in
* another rdma wr
*/
for (i = 0, j = 0;
j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) {
rsize = be32_to_cpu(db->len);
raddr = be64_to_cpu(db->va);
riu->raddr = raddr;
riu->rkey = be32_to_cpu(db->key);
riu->sge_cnt = 0;
riu->sge = sge;
/* calculate how many sge required for this remote_buf */
while (rsize > 0 && tsize > 0) {
if (rsize >= dma_len) {
tsize -= dma_len;
rsize -= dma_len;
raddr += dma_len;
if (tsize > 0) {
++j;
if (j < count)
dma_len = sg_dma_len(&sg[j]);
}
} else {
tsize -= rsize;
dma_len -= rsize;
rsize = 0;
}
++riu->sge_cnt;
++sge;
if (rsize > 0 && riu->sge_cnt == max_sge) {
++riu;
riu->raddr = raddr;
riu->rkey = be32_to_cpu(db->key);
riu->sge_cnt = 0;
riu->sge = sge;
}
}
}
ioctx->n_rdma = riu - ioctx->rdma_ius;
EXTRACHECKS_WARN_ON(ioctx->n_rdma > ioctx->n_rdma_ius);
EXTRACHECKS_WARN_ON(sge - sge_array > nsge);
db = ioctx->rbufs;
tsize = (dir == SCST_DATA_READ)
? scst_cmd_get_adjusted_resp_data_len(scmnd)
: scst_cmd_get_bufflen(scmnd);
riu = ioctx->rdma_ius;
dma_len = sg_dma_len(&sg[0]);
dma_addr = sg_dma_address(&sg[0]);
/* this second loop is really mapped sg_addres to rdma_iu->ib_sge */
for (i = 0, j = 0;
j < count && i < ioctx->n_rbuf && tsize > 0; ++i, ++riu, ++db) {
rsize = be32_to_cpu(db->len);
sge = riu->sge;
k = 0;
while (rsize > 0 && tsize > 0) {
sge->addr = dma_addr;
sge->lkey = ch->sport->sdev->mr->lkey;
if (rsize >= dma_len) {
sge->length =
(tsize < dma_len) ? tsize : dma_len;
tsize -= dma_len;
rsize -= dma_len;
if (tsize > 0) {
++j;
if (j < count) {
dma_len = sg_dma_len(&sg[j]);
dma_addr =
sg_dma_address(&sg[j]);
}
}
} else {
sge->length = (tsize < rsize) ? tsize : rsize;
tsize -= rsize;
dma_len -= rsize;
dma_addr += rsize;
rsize = 0;
}
++k;
if (k == riu->sge_cnt && rsize > 0 && tsize > 0) {
++riu;
sge = riu->sge;
k = 0;
} else if (rsize > 0 && tsize > 0)
++sge;
}
}
EXTRACHECKS_WARN_ON(riu - ioctx->rdma_ius != ioctx->n_rdma);
return 0;
free_mem:
srpt_unmap_sg_to_ib_sge(ch, ioctx);
return -ENOMEM;
}
/**
* srpt_unmap_sg_to_ib_sge() - Unmap an IB SGE list.
*/
static void srpt_unmap_sg_to_ib_sge(struct srpt_rdma_ch *ch,
struct srpt_send_ioctx *ioctx)
{
struct scatterlist *sg;
scst_data_direction dir;
EXTRACHECKS_BUG_ON(!ch);
EXTRACHECKS_BUG_ON(!ioctx);
EXTRACHECKS_BUG_ON(ioctx->n_rdma && !ioctx->rdma_ius);
if (ioctx->rdma_ius != (void *)ioctx->rdma_ius_buf)
kfree(ioctx->rdma_ius);
ioctx->rdma_ius = NULL;
ioctx->n_rdma = 0;
if (ioctx->mapped_sg_count) {
EXTRACHECKS_BUG_ON(!ioctx->scmnd);
EXTRACHECKS_WARN_ON(ioctx
!= scst_cmd_get_tgt_priv(ioctx->scmnd));
sg = ioctx->sg;
EXTRACHECKS_WARN_ON(!sg);
dir = ioctx->dir;
EXTRACHECKS_BUG_ON(dir == SCST_DATA_NONE);
ib_dma_unmap_sg(ch->sport->sdev->device, sg, ioctx->sg_cnt,
scst_to_tgt_dma_dir(dir));
ioctx->mapped_sg_count = 0;
}
}
/**
* srpt_perform_rdmas() - Perform IB RDMA.
*
* Returns zero upon success or a negative number upon failure.
*/
static int srpt_perform_rdmas(struct srpt_rdma_ch *ch,
struct srpt_send_ioctx *ioctx,
scst_data_direction dir)
{
struct ib_send_wr wr;
struct ib_send_wr *bad_wr;
struct rdma_iu *riu;
int i;
int ret;
int sq_wr_avail;
const int n_rdma = ioctx->n_rdma;
if (dir == SCST_DATA_WRITE) {
ret = -ENOMEM;
sq_wr_avail = srpt_adjust_srq_wr_avail(ch, -n_rdma);
if (sq_wr_avail < 0) {
PRINT_WARNING("IB send queue full (needed %d)",
n_rdma);
goto out;
}
}
ioctx->rdma_aborted = false;
ret = 0;
riu = ioctx->rdma_ius;
memset(&wr, 0, sizeof wr);
for (i = 0; i < n_rdma; ++i, ++riu) {
if (dir == SCST_DATA_READ) {
wr.opcode = IB_WR_RDMA_WRITE;
wr.wr_id = encode_wr_id(i == n_rdma - 1 ?
SRPT_RDMA_WRITE_LAST :
SRPT_RDMA_MID,
ioctx->ioctx.index);
} else {
wr.opcode = IB_WR_RDMA_READ;
wr.wr_id = encode_wr_id(i == n_rdma - 1 ?
SRPT_RDMA_READ_LAST :
SRPT_RDMA_MID,
ioctx->ioctx.index);
}
wr.next = NULL;
wr.wr.rdma.remote_addr = riu->raddr;
wr.wr.rdma.rkey = riu->rkey;
wr.num_sge = riu->sge_cnt;
wr.sg_list = riu->sge;
/* only get completion event for the last rdma wr */
if (i == (n_rdma - 1) && dir == SCST_DATA_WRITE)
wr.send_flags = IB_SEND_SIGNALED;
ret = ib_post_send(ch->qp, &wr, &bad_wr);
if (ret)
break;
}
if (ret)
PRINT_ERROR("%s[%d]: ib_post_send() returned %d for %d/%d",
__func__, __LINE__, ret, i, n_rdma);
if (ret && i > 0) {
wr.num_sge = 0;
wr.wr_id = encode_wr_id(SRPT_RDMA_ABORT, ioctx->ioctx.index);
wr.send_flags = IB_SEND_SIGNALED;
while (ch->state == CH_LIVE &&
ib_post_send(ch->qp, &wr, &bad_wr) != 0) {
PRINT_INFO("Trying to abort failed RDMA transfer [%d]",
ioctx->ioctx.index);
msleep(1000);
}
while (ch->state != CH_DRAINING && !ioctx->rdma_aborted) {
PRINT_INFO("Waiting until RDMA abort finished [%d]",
ioctx->ioctx.index);
msleep(1000);
}
PRINT_INFO("%s[%d]: done", __func__, __LINE__);
}
out:
if (unlikely(dir == SCST_DATA_WRITE && ret < 0))
srpt_adjust_srq_wr_avail(ch, n_rdma);
return ret;
}
/**
* srpt_xfer_data() - Start data transfer from initiator to target.
*
* Returns an SCST_TGT_RES_... status code.
*
* Note: Must not block.
*/
static int srpt_xfer_data(struct srpt_rdma_ch *ch,
struct srpt_send_ioctx *ioctx,
struct scst_cmd *scmnd)
{
int ret;
ret = srpt_map_sg_to_ib_sge(ch, ioctx, scmnd);
if (ret) {
PRINT_ERROR("%s[%d] ret=%d", __func__, __LINE__, ret);
ret = SCST_TGT_RES_QUEUE_FULL;
goto out;
}
ret = srpt_perform_rdmas(ch, ioctx, scst_cmd_get_data_direction(scmnd));
if (ret) {
if (ret == -EAGAIN || ret == -ENOMEM) {
PRINT_INFO("%s[%d] queue full -- ret=%d",
__func__, __LINE__, ret);
ret = SCST_TGT_RES_QUEUE_FULL;
} else {
PRINT_ERROR("%s[%d] fatal error -- ret=%d",
__func__, __LINE__, ret);
ret = SCST_TGT_RES_FATAL_ERROR;
}
goto out_unmap;
}
ret = SCST_TGT_RES_SUCCESS;
out:
return ret;
out_unmap:
srpt_unmap_sg_to_ib_sge(ch, ioctx);
goto out;
}
/**
* srpt_pending_cmd_timeout() - SCST command HCA processing timeout callback.
*
* Called by the SCST core if no IB completion notification has been received
* within RDMA_COMPL_TIMEOUT_S seconds.
*/
static void srpt_pending_cmd_timeout(struct scst_cmd *scmnd)
{
struct srpt_send_ioctx *ioctx;
enum srpt_command_state state;
ioctx = scst_cmd_get_tgt_priv(scmnd);
BUG_ON(!ioctx);
state = ioctx->state;
switch (state) {
case SRPT_STATE_NEW:
case SRPT_STATE_DATA_IN:
case SRPT_STATE_DONE:
/*
* srpt_pending_cmd_timeout() should never be invoked for
* commands in this state.
*/
PRINT_ERROR("Processing SCST command %p (SRPT state %d) took"
" too long -- aborting", scmnd, state);
break;
case SRPT_STATE_NEED_DATA:
case SRPT_STATE_CMD_RSP_SENT:
case SRPT_STATE_MGMT_RSP_SENT:
default:
PRINT_ERROR("Command %p: IB completion for idx %u has not"
" been received in time (SRPT command state %d)",
scmnd, ioctx->ioctx.index, state);
break;
}
srpt_abort_cmd(ioctx, SCST_CONTEXT_SAME);
}
/**
* srpt_rdy_to_xfer() - Transfers data from initiator to target.
*
* Called by the SCST core to transfer data from the initiator to the target
* (SCST_DATA_WRITE). Must not block.
*/
static int srpt_rdy_to_xfer(struct scst_cmd *scmnd)
{
struct srpt_send_ioctx *ioctx;
enum srpt_command_state prev_cmd_state;
int ret;
ioctx = scst_cmd_get_tgt_priv(scmnd);
prev_cmd_state = srpt_set_cmd_state(ioctx, SRPT_STATE_NEED_DATA);
ret = srpt_xfer_data(ioctx->ch, ioctx, scmnd);
if (unlikely(ret != SCST_TGT_RES_SUCCESS))
srpt_set_cmd_state(ioctx, prev_cmd_state);
return ret;
}
/**
* srpt_xmit_response() - Transmits the response to a SCSI command.
*
* Callback function called by the SCST core. Must not block. Must ensure that
* scst_tgt_cmd_done() will get invoked when returning SCST_TGT_RES_SUCCESS.
*/
static int srpt_xmit_response(struct scst_cmd *scmnd)
{
struct srpt_rdma_ch *ch;
struct srpt_send_ioctx *ioctx;
enum srpt_command_state state;
int ret;
scst_data_direction dir;
int resp_len;
ret = SCST_TGT_RES_SUCCESS;
ioctx = scst_cmd_get_tgt_priv(scmnd);
BUG_ON(!ioctx);
ch = scst_sess_get_tgt_priv(scst_cmd_get_session(scmnd));
BUG_ON(!ch);
spin_lock(&ioctx->spinlock);
state = ioctx->state;
switch (state) {
case SRPT_STATE_NEW:
case SRPT_STATE_DATA_IN:
ioctx->state = SRPT_STATE_CMD_RSP_SENT;
break;
default:
WARN(true, "Unexpected command state %d", state);
break;
}
spin_unlock(&ioctx->spinlock);
if (unlikely(scst_cmd_aborted_on_xmit(scmnd))) {
srpt_adjust_req_lim(ch, 0, 1);
srpt_abort_cmd(ioctx, SCST_CONTEXT_SAME);
goto out;
}
EXTRACHECKS_BUG_ON(scst_cmd_atomic(scmnd));
dir = scst_cmd_get_data_direction(scmnd);
/* For read commands, transfer the data to the initiator. */
if (dir == SCST_DATA_READ
&& scst_cmd_get_adjusted_resp_data_len(scmnd)) {
ret = srpt_xfer_data(ch, ioctx, scmnd);
if (unlikely(ret != SCST_TGT_RES_SUCCESS)) {
srpt_set_cmd_state(ioctx, state);
PRINT_WARNING("xfer_data failed for tag %llu"
" - %s", scst_cmd_get_tag(scmnd),
ret == SCST_TGT_RES_QUEUE_FULL ?
"retrying" : "failing");
goto out;
}
}
ioctx->req_lim_delta = srpt_inc_req_lim(ch);
resp_len = srpt_build_cmd_rsp(ch, ioctx,
scst_cmd_get_tag(scmnd),
scst_cmd_get_status(scmnd),
scst_cmd_get_sense_buffer(scmnd),
scst_cmd_get_sense_buffer_len(scmnd));
if (srpt_post_send(ch, ioctx, resp_len)) {
srpt_unmap_sg_to_ib_sge(ch, ioctx);
srpt_set_cmd_state(ioctx, state);
srpt_undo_inc_req_lim(ch, ioctx->req_lim_delta);
PRINT_WARNING("sending response failed for tag %llu - retrying",
scst_cmd_get_tag(scmnd));
ret = SCST_TGT_RES_QUEUE_FULL;
}
out:
return ret;
}
/**
* srpt_tsk_mgmt_done() - SCST callback function that sends back the response
* for a task management request.
*
* Must not block.
*/
static void srpt_tsk_mgmt_done(struct scst_mgmt_cmd *mcmnd)
{
struct srpt_rdma_ch *ch;
struct srpt_send_ioctx *ioctx;
int rsp_len;
ioctx = scst_mgmt_cmd_get_tgt_priv(mcmnd);
BUG_ON(!ioctx);
ch = ioctx->ch;
BUG_ON(!ch);
TRACE_DBG("%s: tsk_mgmt_done for tag= %lld status=%d",
__func__, ioctx->tsk_mgmt.tag,
scst_mgmt_cmd_get_status(mcmnd));
WARN_ON(in_irq());
srpt_set_cmd_state(ioctx, SRPT_STATE_MGMT_RSP_SENT);
WARN_ON(ioctx->state == SRPT_STATE_DONE);
ioctx->req_lim_delta = srpt_inc_req_lim(ch);
rsp_len = srpt_build_tskmgmt_rsp(ch, ioctx,
scst_to_srp_tsk_mgmt_status(
scst_mgmt_cmd_get_status(mcmnd)),
ioctx->tsk_mgmt.tag);
/*
* Note: the srpt_post_send() call below sends the task management
* response asynchronously. It is possible that the SCST core has
* already freed the struct scst_mgmt_cmd structure before the
* response is sent. This is fine however.
*/
if (srpt_post_send(ch, ioctx, rsp_len)) {
PRINT_ERROR("Sending SRP_RSP response failed.");
srpt_put_send_ioctx(ioctx);
srpt_undo_inc_req_lim(ch, ioctx->req_lim_delta);
}
}
/**
* srpt_get_initiator_port_transport_id() - SCST TransportID callback function.
*
* See also SPC-3, section 7.5.4.5, TransportID for initiator ports using SRP.
*/
static int srpt_get_initiator_port_transport_id(struct scst_tgt *tgt,
struct scst_session *scst_sess, uint8_t **transport_id)
{
struct srpt_rdma_ch *ch;
struct spc_rdma_transport_id {
uint8_t protocol_identifier;
uint8_t reserved[7];
uint8_t i_port_id[16];
};
struct spc_rdma_transport_id *tr_id;
int res;
TRACE_ENTRY();
if (!scst_sess) {
res = SCSI_TRANSPORTID_PROTOCOLID_SRP;
goto out;
}
ch = scst_sess_get_tgt_priv(scst_sess);
BUG_ON(!ch);
BUILD_BUG_ON(sizeof(*tr_id) != 24);
tr_id = kzalloc(sizeof(struct spc_rdma_transport_id), GFP_KERNEL);
if (!tr_id) {
PRINT_ERROR("Allocation of TransportID failed");
res = -ENOMEM;
goto out;
}
res = 0;
tr_id->protocol_identifier = SCSI_TRANSPORTID_PROTOCOLID_SRP;
memcpy(tr_id->i_port_id, ch->i_port_id, sizeof(ch->i_port_id));
*transport_id = (uint8_t *)tr_id;
out:
TRACE_EXIT_RES(res);
return res;
}
/**
* srpt_on_free_cmd() - Free command-private data.
*
* Called by the SCST core. May be called in IRQ context.
*/
static void srpt_on_free_cmd(struct scst_cmd *scmnd)
{
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) && !defined(BACKPORT_LINUX_WORKQUEUE_TO_2_6_19)
/* A vanilla 2.6.19 or older kernel without backported OFED kernel headers. */
static void srpt_refresh_port_work(void *ctx)
#else
static void srpt_refresh_port_work(struct work_struct *work)
#endif
{
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) && !defined(BACKPORT_LINUX_WORKQUEUE_TO_2_6_19)
struct srpt_port *sport = ctx;
#else
struct srpt_port *sport = container_of(work, struct srpt_port, work);
#endif
srpt_refresh_port(sport);
}
/**
* srpt_detect() - Returns the number of target adapters.
*
* Callback function called by the SCST core.
*/
static int srpt_detect(struct scst_tgt_template *tp)
{
int device_count;
TRACE_ENTRY();
device_count = atomic_read(&srpt_device_count);
TRACE_EXIT_RES(device_count);
return device_count;
}
static int srpt_ch_list_empty(struct srpt_device *sdev)
{
int res;
spin_lock_irq(&sdev->spinlock);
res = list_empty(&sdev->rch_list);
spin_unlock_irq(&sdev->spinlock);
return res;
}
/**
* srpt_release_sdev() - Free channel resources associated with a target.
*/
static int srpt_release_sdev(struct srpt_device *sdev)
{
struct srpt_rdma_ch *ch, *next_ch;
TRACE_ENTRY();
WARN_ON_ONCE(irqs_disabled());
BUG_ON(!sdev);
/* Disallow new logins and close all active sessions. */
spin_lock_irq(&sdev->spinlock);
sdev->enabled = false;
list_for_each_entry_safe(ch, next_ch, &sdev->rch_list, list)
__srpt_close_ch(ch);
spin_unlock_irq(&sdev->spinlock);
while (wait_event_timeout(sdev->ch_releaseQ,
srpt_ch_list_empty(sdev), 5 * HZ) <= 0) {
PRINT_INFO("%s: waiting for session unregistration ...",
sdev->device->name);
spin_lock_irq(&sdev->spinlock);
list_for_each_entry_safe(ch, next_ch, &sdev->rch_list, list) {
PRINT_INFO("%s: state %s; %d commands in progress",
ch->sess_name, get_ch_state_name(ch->state),
atomic_read(&ch->scst_sess->sess_cmd_count));
}
spin_unlock_irq(&sdev->spinlock);
}
TRACE_EXIT();
return 0;
}
/**
* srpt_release() - Free the resources associated with an SCST target.
*
* Callback function called by the SCST core from scst_unregister_target().
*/
static int srpt_release(struct scst_tgt *scst_tgt)
{
struct srpt_device *sdev = scst_tgt_get_tgt_priv(scst_tgt);
TRACE_ENTRY();
EXTRACHECKS_WARN_ON_ONCE(irqs_disabled());
BUG_ON(!scst_tgt);
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 18)
WARN_ON(!sdev);
if (!sdev)
return -ENODEV;
#else
if (WARN_ON(!sdev))
return -ENODEV;
#endif
srpt_release_sdev(sdev);
scst_tgt_set_tgt_priv(scst_tgt, NULL);
TRACE_EXIT();
return 0;
}
/**
* srpt_get_scsi_transport_version() - Returns the SCSI transport version.
* This function is called from scst_pres.c, the code that implements
* persistent reservation support.
*/
static uint16_t srpt_get_scsi_transport_version(struct scst_tgt *scst_tgt)
{
return 0x0940; /* SRP */
}
#if defined(CONFIG_SCST_PROC)
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)
static ssize_t show_login_info(struct class_device *dev, char *buf)
#else
static ssize_t show_login_info(struct device *dev,
struct device_attribute *attr, char *buf)
#endif
#else
static ssize_t show_login_info(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
#endif
{
#if !defined(CONFIG_SCST_PROC)
struct scst_tgt *scst_tgt;
#endif
struct srpt_device *sdev;
struct srpt_port *sport;
int i;
int len;
#if defined(CONFIG_SCST_PROC)
sdev = container_of(dev, struct srpt_device, dev);
#else
scst_tgt = container_of(kobj, struct scst_tgt, tgt_kobj);
sdev = scst_tgt_get_tgt_priv(scst_tgt);
#endif
len = 0;
for (i = 0; i < sdev->device->phys_port_cnt; i++) {
sport = &sdev->port[i];
len += sprintf(buf + len,
"tid_ext=%016llx,ioc_guid=%016llx,pkey=ffff,"
"dgid=%04x%04x%04x%04x%04x%04x%04x%04x,"
"service_id=%016llx\n",
srpt_service_guid,
srpt_service_guid,
be16_to_cpu(((__be16 *) sport->gid.raw)[0]),
be16_to_cpu(((__be16 *) sport->gid.raw)[1]),
be16_to_cpu(((__be16 *) sport->gid.raw)[2]),
be16_to_cpu(((__be16 *) sport->gid.raw)[3]),
be16_to_cpu(((__be16 *) sport->gid.raw)[4]),
be16_to_cpu(((__be16 *) sport->gid.raw)[5]),
be16_to_cpu(((__be16 *) sport->gid.raw)[6]),
be16_to_cpu(((__be16 *) sport->gid.raw)[7]),
srpt_service_guid);
}
return len;
}
#if !defined(CONFIG_SCST_PROC)
static struct kobj_attribute srpt_show_login_info_attr =
__ATTR(login_info, S_IRUGO, show_login_info, NULL);
static const struct attribute *srpt_tgt_attrs[] = {
&srpt_show_login_info_attr.attr,
NULL
};
static ssize_t show_req_lim(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct scst_session *scst_sess;
struct srpt_rdma_ch *ch;
scst_sess = container_of(kobj, struct scst_session, sess_kobj);
ch = scst_sess_get_tgt_priv(scst_sess);
if (!ch)
return -ENOENT;
return sprintf(buf, "%d\n", ch->req_lim);
}
static ssize_t show_req_lim_delta(struct kobject *kobj,
struct kobj_attribute *attr, char *buf)
{
struct scst_session *scst_sess;
struct srpt_rdma_ch *ch;
scst_sess = container_of(kobj, struct scst_session, sess_kobj);
ch = scst_sess_get_tgt_priv(scst_sess);
if (!ch)
return -ENOENT;
return sprintf(buf, "%d\n", ch->req_lim_delta);
}
static ssize_t show_ch_state(struct kobject *kobj, struct kobj_attribute *attr,
char *buf)
{
struct scst_session *scst_sess;
struct srpt_rdma_ch *ch;
scst_sess = container_of(kobj, struct scst_session, sess_kobj);
ch = scst_sess_get_tgt_priv(scst_sess);
if (!ch)
return -ENOENT;
return sprintf(buf, "%s\n", get_ch_state_name(ch->state));
}
static const struct kobj_attribute srpt_req_lim_attr =
__ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
static const struct kobj_attribute srpt_req_lim_delta_attr =
__ATTR(req_lim_delta, S_IRUGO, show_req_lim_delta, NULL);
static const struct kobj_attribute srpt_ch_state_attr =
__ATTR(ch_state, S_IRUGO, show_ch_state, NULL);
static const struct attribute *srpt_sess_attrs[] = {
&srpt_req_lim_attr.attr,
&srpt_req_lim_delta_attr.attr,
&srpt_ch_state_attr.attr,
NULL
};
#endif
/* SCST target template for the SRP target implementation. */
static struct scst_tgt_template srpt_template = {
.name = DRV_NAME,
.sg_tablesize = SRPT_DEF_SG_TABLESIZE,
.max_hw_pending_time = RDMA_COMPL_TIMEOUT_S,
#if !defined(CONFIG_SCST_PROC)
.enable_target = srpt_enable_target,
.is_target_enabled = srpt_is_target_enabled,
.tgt_attrs = srpt_tgt_attrs,
.sess_attrs = srpt_sess_attrs,
#endif
#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
.default_trace_flags = DEFAULT_SRPT_TRACE_FLAGS,
.trace_flags = &trace_flag,
#endif
.detect = srpt_detect,
.release = srpt_release,
.xmit_response = srpt_xmit_response,
.rdy_to_xfer = srpt_rdy_to_xfer,
.on_hw_pending_cmd_timeout = srpt_pending_cmd_timeout,
.on_free_cmd = srpt_on_free_cmd,
.task_mgmt_fn_done = srpt_tsk_mgmt_done,
.get_initiator_port_transport_id = srpt_get_initiator_port_transport_id,
.get_scsi_transport_version = srpt_get_scsi_transport_version,
};
#ifdef CONFIG_SCST_PROC
#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
static int srpt_trace_level_show(struct seq_file *seq, void *v)
{
return scst_proc_log_entry_read(seq, trace_flag, NULL);
}
static ssize_t srpt_proc_trace_level_write(struct file *file,
const char __user *buf, size_t length, loff_t *off)
{
return scst_proc_log_entry_write(file, buf, length, &trace_flag,
DEFAULT_SRPT_TRACE_FLAGS, NULL);
}
static struct scst_proc_data srpt_log_proc_data = {
SCST_DEF_RW_SEQ_OP(srpt_proc_trace_level_write)
.show = srpt_trace_level_show,
};
#endif
/**
* srpt_dev_release() - Device release callback function.
*
* The callback function srpt_dev_release() is called whenever a device is
* removed from the /sys/class/infiniband_srpt device class. This function
* has been left empty because device nodes are embedded in struct
* srpt_device.
*/
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)
static void srpt_dev_release(struct class_device *dev)
#else
static void srpt_dev_release(struct device *dev)
#endif
{
}
static struct class_attribute srpt_class_attrs[] = {
__ATTR_NULL,
};
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)
static struct class_device_attribute srpt_dev_attrs[] = {
#else
static struct device_attribute srpt_dev_attrs[] = {
#endif
__ATTR(login_info, S_IRUGO, show_login_info, NULL),
__ATTR_NULL,
};
static struct class srpt_class = {
.name = "infiniband_srpt",
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)
.release = srpt_dev_release,
#else
.dev_release = srpt_dev_release,
#endif
.class_attrs = srpt_class_attrs,
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)
.class_dev_attrs = srpt_dev_attrs,
#else
.dev_attrs = srpt_dev_attrs,
#endif
};
#endif /*CONFIG_SCST_PROC*/
/**
* srpt_add_one() - Infiniband device addition callback function.
*/
static void srpt_add_one(struct ib_device *device)
{
struct srpt_device *sdev;
struct srpt_port *sport;
struct ib_srq_init_attr srq_attr;
char tgt_name[24];
int i, ret;
TRACE_ENTRY();
TRACE_DBG("device = %p, device->dma_ops = %p", device, device->dma_ops);
sdev = kzalloc(sizeof *sdev, GFP_KERNEL);
if (!sdev)
goto err;
sdev->device = device;
INIT_LIST_HEAD(&sdev->rch_list);
init_waitqueue_head(&sdev->ch_releaseQ);
spin_lock_init(&sdev->spinlock);
if (use_node_guid_in_target_name) {
snprintf(tgt_name, sizeof(tgt_name), "%04x:%04x:%04x:%04x",
be16_to_cpu(((__be16 *)&device->node_guid)[0]),
be16_to_cpu(((__be16 *)&device->node_guid)[1]),
be16_to_cpu(((__be16 *)&device->node_guid)[2]),
be16_to_cpu(((__be16 *)&device->node_guid)[3]));
sdev->scst_tgt = scst_register_target(&srpt_template, tgt_name);
} else
sdev->scst_tgt = scst_register_target(&srpt_template, NULL);
if (!sdev->scst_tgt) {
PRINT_ERROR("SCST registration failed for %s.",
sdev->device->name);
goto free_dev;
}
scst_tgt_set_tgt_priv(sdev->scst_tgt, sdev);
#ifdef CONFIG_SCST_PROC
sdev->dev.class = &srpt_class;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)
sdev->dev.dev = device->dma_device;
#else
sdev->dev.parent = device->dma_device;
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)
snprintf(sdev->dev.class_id, BUS_ID_SIZE, "srpt-%s", device->name);
#elif LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 30)
snprintf(sdev->dev.bus_id, BUS_ID_SIZE, "srpt-%s", device->name);
#else
dev_set_name(&sdev->dev, "srpt-%s", device->name);
#endif
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)
if (class_device_register(&sdev->dev))
goto unregister_tgt;
#else
if (device_register(&sdev->dev))
goto unregister_tgt;
#endif
#endif /*CONFIG_SCST_PROC*/
ret = ib_query_device(device, &sdev->dev_attr);
if (ret) {
PRINT_ERROR("ib_query_device() failed: %d", ret);
#ifdef CONFIG_SCST_PROC
goto err_dev;
#else
goto unregister_tgt;
#endif
}
sdev->pd = ib_alloc_pd(device);
if (IS_ERR(sdev->pd)) {
PRINT_ERROR("ib_alloc_pd() failed: %ld", PTR_ERR(sdev->pd));
#ifdef CONFIG_SCST_PROC
goto err_dev;
#else
goto unregister_tgt;
#endif
}
sdev->mr = ib_get_dma_mr(sdev->pd, IB_ACCESS_LOCAL_WRITE);
if (IS_ERR(sdev->mr)) {
PRINT_ERROR("ib_get_dma_mr() failed: %ld", PTR_ERR(sdev->mr));
goto err_pd;
}
sdev->srq_size = min(max(srpt_srq_size, MIN_SRPT_SRQ_SIZE),
sdev->dev_attr.max_srq_wr);
memset(&srq_attr, 0, sizeof(srq_attr));
srq_attr.event_handler = srpt_srq_event;
srq_attr.srq_context = (void *)sdev;
srq_attr.attr.max_wr = sdev->srq_size;
srq_attr.attr.max_sge = 1;
srq_attr.attr.srq_limit = 0;
#if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 2, 0)
srq_attr.srq_type = IB_SRQT_BASIC;
#endif
sdev->srq = ib_create_srq(sdev->pd, &srq_attr);
if (IS_ERR(sdev->srq)) {
PRINT_ERROR("ib_create_srq() failed: %ld", PTR_ERR(sdev->srq));
goto err_mr;
}
TRACE_DBG("%s: create SRQ #wr= %d max_allow=%d dev= %s", __func__,
sdev->srq_size, sdev->dev_attr.max_srq_wr, device->name);
if (!srpt_service_guid)
srpt_service_guid = be64_to_cpu(device->node_guid) &
~be64_to_cpu(IB_SERVICE_ID_AGN_MASK);
sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);
if (IS_ERR(sdev->cm_id)) {
PRINT_ERROR("ib_create_cm_id() failed: %ld",
PTR_ERR(sdev->cm_id));
goto err_srq;
}
/* print out target login information */
TRACE_DBG("Target login info: id_ext=%016llx,"
"ioc_guid=%016llx,pkey=ffff,service_id=%016llx",
srpt_service_guid, srpt_service_guid, srpt_service_guid);
/*
* We do not have a consistent service_id (ie. also id_ext of target_id)
* to identify this target. We currently use the guid of the first HCA
* in the system as service_id; therefore, the target_id will change
* if this HCA is gone bad and replaced by different HCA
*/
ret = ib_cm_listen(sdev->cm_id, cpu_to_be64(srpt_service_guid), 0,
NULL);
if (ret) {
PRINT_ERROR("ib_cm_listen() failed: %d (cm_id state = %d)",
ret, sdev->cm_id->state);
goto err_cm;
}
INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
srpt_event_handler);
ret = ib_register_event_handler(&sdev->event_handler);
if (ret) {
PRINT_ERROR("ib_register_event_handler() failed: %d", ret);
goto err_cm;
}
sdev->ioctx_ring = (struct srpt_recv_ioctx **)
srpt_alloc_ioctx_ring(sdev, sdev->srq_size,
sizeof(*sdev->ioctx_ring[0]),
srp_max_req_size, DMA_FROM_DEVICE);
if (!sdev->ioctx_ring) {
PRINT_ERROR("srpt_alloc_ioctx_ring() failed");
goto err_event;
}
for (i = 0; i < sdev->srq_size; ++i)
srpt_post_recv(sdev, sdev->ioctx_ring[i]);
WARN_ON(sdev->device->phys_port_cnt > ARRAY_SIZE(sdev->port));
for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
sport = &sdev->port[i - 1];
sport->sdev = sdev;
sport->port = i;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20) && !defined(BACKPORT_LINUX_WORKQUEUE_TO_2_6_19)
/*
* A vanilla 2.6.19 or older kernel without backported OFED
* kernel headers.
*/
INIT_WORK(&sport->work, srpt_refresh_port_work, sport);
#else
INIT_WORK(&sport->work, srpt_refresh_port_work);
#endif
if (srpt_refresh_port(sport)) {
PRINT_ERROR("MAD registration failed for %s-%d.",
sdev->device->name, i);
goto err_ring;
}
}
atomic_inc(&srpt_device_count);
out:
ib_set_client_data(device, &srpt_client, sdev);
TRACE_EXIT();
return;
err_ring:
srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
sdev->srq_size, srp_max_req_size,
DMA_FROM_DEVICE);
err_event:
ib_unregister_event_handler(&sdev->event_handler);
err_cm:
ib_destroy_cm_id(sdev->cm_id);
err_srq:
ib_destroy_srq(sdev->srq);
err_mr:
ib_dereg_mr(sdev->mr);
err_pd:
ib_dealloc_pd(sdev->pd);
#ifdef CONFIG_SCST_PROC
err_dev:
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)
class_device_unregister(&sdev->dev);
#else
device_unregister(&sdev->dev);
#endif
#endif /*CONFIG_SCST_PROC*/
unregister_tgt:
scst_unregister_target(sdev->scst_tgt);
free_dev:
kfree(sdev);
err:
sdev = NULL;
PRINT_INFO("%s(%s) failed.", __func__, device->name);
goto out;
}
/**
* srpt_remove_one() - InfiniBand device removal callback function.
*/
static void srpt_remove_one(struct ib_device *device)
{
int i;
struct srpt_device *sdev;
TRACE_ENTRY();
sdev = ib_get_client_data(device, &srpt_client);
if (!sdev) {
PRINT_INFO("%s(%s): nothing to do.", __func__, device->name);
return;
}
srpt_unregister_mad_agent(sdev);
ib_unregister_event_handler(&sdev->event_handler);
/* Cancel any work queued by the just unregistered IB event handler. */
for (i = 0; i < sdev->device->phys_port_cnt; i++)
#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 22)
cancel_work_sync(&sdev->port[i].work);
#else
/*
* cancel_work_sync() was introduced in kernel 2.6.22. Older
* kernels do not have a facility to cancel scheduled work, so
* wait until the scheduled work finished.
*/
flush_scheduled_work();
#endif
ib_destroy_cm_id(sdev->cm_id);
/*
* Unregistering an SCST target must happen after destroying sdev->cm_id
* such that no new SRP_LOGIN_REQ information units can arrive while
* destroying the SCST target.
*/
scst_unregister_target(sdev->scst_tgt);
sdev->scst_tgt = NULL;
ib_destroy_srq(sdev->srq);
ib_dereg_mr(sdev->mr);
ib_dealloc_pd(sdev->pd);
#ifdef CONFIG_SCST_PROC
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26)
class_device_unregister(&sdev->dev);
#else
device_unregister(&sdev->dev);
#endif
#endif /*CONFIG_SCST_PROC*/
srpt_free_ioctx_ring((struct srpt_ioctx **)sdev->ioctx_ring, sdev,
sdev->srq_size, srp_max_req_size, DMA_FROM_DEVICE);
sdev->ioctx_ring = NULL;
kfree(sdev);
TRACE_EXIT();
}
static struct ib_client srpt_client = {
.name = DRV_NAME,
.add = srpt_add_one,
.remove = srpt_remove_one
};
#ifdef CONFIG_SCST_PROC
/**
* srpt_register_procfs_entry() - Create SRPT procfs entries.
*
* Currently the only procfs entry created by this function is the
* "trace_level" entry.
*/
static int srpt_register_procfs_entry(struct scst_tgt_template *tgt)
{
int res = 0;
#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
struct proc_dir_entry *p, *root;
root = scst_proc_get_tgt_root(tgt);
WARN_ON(!root);
if (root) {
/*
* Fill in the scst_proc_data::data pointer, which is used in
* a printk(KERN_INFO ...) statement in
* scst_proc_log_entry_write() in scst_proc.c.
*/
srpt_log_proc_data.data = (char *)tgt->name;
p = scst_create_proc_entry(root, SRPT_PROC_TRACE_LEVEL_NAME,
&srpt_log_proc_data);
if (!p)
res = -ENOMEM;
} else
res = -ENOMEM;
#endif
return res;
}
/**
* srpt_unregister_procfs_entry() - Unregister SRPT procfs entries.
*/
static void srpt_unregister_procfs_entry(struct scst_tgt_template *tgt)
{
#if defined(CONFIG_SCST_DEBUG) || defined(CONFIG_SCST_TRACING)
struct proc_dir_entry *root;
root = scst_proc_get_tgt_root(tgt);
WARN_ON(!root);
if (root)
remove_proc_entry(SRPT_PROC_TRACE_LEVEL_NAME, root);
#endif
}
#endif /*CONFIG_SCST_PROC*/
/**
* srpt_init_module() - Kernel module initialization.
*
* Note: Since ib_register_client() registers callback functions, and since at
* least one of these callback functions (srpt_add_one()) calls SCST functions,
* the SCST target template must be registered before ib_register_client() is
* called.
*/
static int __init srpt_init_module(void)
{
int ret;
ret = -EINVAL;
if (srp_max_req_size < MIN_MAX_REQ_SIZE) {
PRINT_ERROR("invalid value %d for kernel module parameter"
" srp_max_req_size -- must be at least %d.",
srp_max_req_size,
MIN_MAX_REQ_SIZE);
goto out;
}
if (srp_max_rsp_size < MIN_MAX_RSP_SIZE) {
PRINT_ERROR("invalid value %d for kernel module parameter"
" srp_max_rsp_size -- must be at least %d.",
srp_max_rsp_size,
MIN_MAX_RSP_SIZE);
goto out;
}
if (srpt_srq_size < MIN_SRPT_SRQ_SIZE
|| srpt_srq_size > MAX_SRPT_SRQ_SIZE) {
PRINT_ERROR("invalid value %d for kernel module parameter"
" srpt_srq_size -- must be in the range [%d..%d].",
srpt_srq_size, MIN_SRPT_SRQ_SIZE,
MAX_SRPT_SRQ_SIZE);
goto out;
}
if (srpt_sq_size < MIN_SRPT_SQ_SIZE) {
PRINT_ERROR("invalid value %d for kernel module parameter"
" srpt_sq_size -- must be at least %d.",
srpt_srq_size, MIN_SRPT_SQ_SIZE);
goto out;
}
if (!use_node_guid_in_target_name)
PRINT_WARNING("%s", "Usage of HCA numbers as SCST target names "
"is deprecated and will be removed in one of the next "
"versions. It is strongly recommended to set "
"use_node_guid_in_target_name parameter in 1 and "
"update your SCST config file accordingly to use HCAs "
"GUIDs.");
#ifdef CONFIG_SCST_PROC
ret = class_register(&srpt_class);
if (ret) {
PRINT_ERROR("couldn't register class ib_srpt");
goto out;
}
#endif
ret = scst_register_target_template(&srpt_template);
if (ret < 0) {
PRINT_ERROR("couldn't register with scst");
ret = -ENODEV;
#ifdef CONFIG_SCST_PROC
goto out_unregister_class;
#else
goto out;
#endif
}
ret = ib_register_client(&srpt_client);
if (ret) {
PRINT_ERROR("couldn't register IB client");
goto out_unregister_target;
}
#ifdef CONFIG_SCST_PROC
ret = srpt_register_procfs_entry(&srpt_template);
if (ret) {
PRINT_ERROR("couldn't register procfs entry");
goto out_unregister_client;
}
#endif /*CONFIG_SCST_PROC*/
return 0;
#ifdef CONFIG_SCST_PROC
out_unregister_client:
ib_unregister_client(&srpt_client);
#endif /*CONFIG_SCST_PROC*/
out_unregister_target:
scst_unregister_target_template(&srpt_template);
#ifdef CONFIG_SCST_PROC
out_unregister_class:
class_unregister(&srpt_class);
#endif /*CONFIG_SCST_PROC*/
out:
return ret;
}
static void __exit srpt_cleanup_module(void)
{
TRACE_ENTRY();
ib_unregister_client(&srpt_client);
#ifdef CONFIG_SCST_PROC
srpt_unregister_procfs_entry(&srpt_template);
#endif /*CONFIG_SCST_PROC*/
scst_unregister_target_template(&srpt_template);
#ifdef CONFIG_SCST_PROC
class_unregister(&srpt_class);
#endif /*CONFIG_SCST_PROC*/
TRACE_EXIT();
}
module_init(srpt_init_module);
module_exit(srpt_cleanup_module);
/*
* Local variables:
* c-basic-offset: 8
* indent-tabs-mode: t
* End:
*/
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