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8b77aa8ad2601061f48d2eae2c454e0c54dd66d4
scst/srpt/src/ib_srpt.c
T
Vladislav Bolkhovitin 0cfbfa801c Patch from Bart Van Assche <bart.vanassche@gmail.com>: 
The patch below fixes the following checkpatch warning:
__func__ should be used instead of gcc specific __FUNCTION__

This patch has been tested as follows:
- Checked that make -C ib_srpt still works.
- Checked that the patch generated by generate-kernel-patch still applies
  cleanly to the 2.6.25.4 kernel, that the patched kernel still compiles,
  installs and boots and that the scst, iscsi-scst and ib_srpt modules still
  load (I performed rm -rf /lib/modules/2.6.25.4* before starting kernel
  compilation).

Signed-off-by: Bart Van Assche <bart.vanassche@gmail.com>



git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@409 d57e44dd-8a1f-0410-8b47-8ef2f437770f
2008-06-12 14:59:48 +00:00

2319 lines
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/*
* Copyright (c) 2006 Mellanox Technology Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/kthread.h>
#include <asm/atomic.h>
#include "ib_srpt.h"
#define DRV_NAME "ib_srpt"
#define PFX DRV_NAME ": "
#define DRV_VERSION "0.1"
#define DRV_RELDATE "January 10, 2007"
#define MELLANOX_SRPT_ID_STRING "Mellanox OFED SRP target"
MODULE_AUTHOR("Vu Pham");
MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol target "
"v" DRV_VERSION " (" DRV_RELDATE ")");
MODULE_LICENSE("Dual BSD/GPL");
struct srpt_thread {
spinlock_t thread_lock;
struct list_head thread_ioctx_list;
struct task_struct *thread;
};
static u64 mellanox_ioc_guid;
static struct list_head srpt_devices;
static int thread = 1;
static struct srpt_thread srpt_thread;
DECLARE_WAIT_QUEUE_HEAD(ioctx_list_waitQ);
module_param(thread, int, 0444);
MODULE_PARM_DESC(thread,
"Executing ioctx in thread context. Default thread = 1");
static void srpt_add_one(struct ib_device *device);
static void srpt_remove_one(struct ib_device *device);
static int srpt_disconnect_channel(struct srpt_rdma_ch *ch, int dreq);
static struct ib_client srpt_client = {
.name = DRV_NAME,
.add = srpt_add_one,
.remove = srpt_remove_one
};
static void srpt_event_handler(struct ib_event_handler *handler,
struct ib_event *event)
{
struct srpt_device *sdev =
ib_get_client_data(event->device, &srpt_client);
struct srpt_port *sport;
if (!sdev || sdev->device != event->device)
return;
printk(KERN_WARNING PFX "ASYNC event= %d on device= %s\n",
event->event, sdev->device->name);
switch (event->event) {
case IB_EVENT_PORT_ERR:
if (event->element.port_num <= sdev->device->phys_port_cnt) {
sport = &sdev->port[event->element.port_num - 1];
sport->lid = 0;
sport->sm_lid = 0;
}
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:
if (event->element.port_num <= sdev->device->phys_port_cnt) {
sport = &sdev->port[event->element.port_num - 1];
if (!sport->lid && !sport->sm_lid)
schedule_work(&sport->work);
}
break;
default:
break;
}
}
static void srpt_srq_event(struct ib_event *event, void *ctx)
{
printk(KERN_WARNING PFX "SRQ event %d\n", event->event);
}
static void srpt_qp_event(struct ib_event *event, void *ctx)
{
struct srpt_rdma_ch *ch = ctx;
printk(KERN_WARNING PFX "QP event %d on cm_id= %p sess_name= %s state= %d\n",
event->event, ch->cm_id, ch->sess_name, ch->state);
switch (event->event) {
case IB_EVENT_COMM_EST:
ib_cm_notify(ch->cm_id, event->event);
break;
case IB_EVENT_QP_LAST_WQE_REACHED:
if (ch->state == RDMA_CHANNEL_LIVE) {
printk(KERN_WARNING PFX "Schedule CM_DISCONNECT_WORK\n");
srpt_disconnect_channel(ch, 1);
}
break;
default:
break;
}
}
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;
}
}
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;
}
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 = 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;
}
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, MELLANOX_SRPT_ID_STRING);
iocp->guid = cpu_to_be64(mellanox_ioc_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(SRPT_SRQ_SIZE);
iocp->rdma_read_depth = 4;
iocp->send_size = cpu_to_be32(MAX_MESSAGE_SIZE);
iocp->rdma_size = cpu_to_be32(MAX_RDMA_SIZE);
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;
}
static void srpt_get_svc_entries(u16 slot, u8 hi, u8 lo, struct ib_dm_mad *mad)
{
struct ib_dm_svc_entries *svc_entries;
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(mellanox_ioc_guid);
sprintf(svc_entries->service_entries[0].name, "%s%016llx",
SRP_SERVICE_NAME_PREFIX, (unsigned long long)mellanox_ioc_guid);
mad->mad_hdr.status = 0;
}
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(slot, hi, lo, rsp_mad);
break;
default:
rsp_mad->mad_hdr.status =
cpu_to_be16(DM_MAD_STATUS_UNSUP_METHOD_ATTR);
break;
}
}
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);
}
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;
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);
}
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;
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))
goto err_query_port;
}
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:
return ret;
}
static struct srpt_ioctx *srpt_alloc_ioctx(struct srpt_device *sdev)
{
struct srpt_ioctx *ioctx;
ioctx = kmalloc(sizeof *ioctx, GFP_KERNEL);
if (!ioctx)
goto out;
ioctx->buf = kzalloc(MAX_MESSAGE_SIZE, GFP_KERNEL);
if (!ioctx->buf)
goto out_free_ioctx;
ioctx->dma = dma_map_single(sdev->device->dma_device, ioctx->buf,
MAX_MESSAGE_SIZE, DMA_BIDIRECTIONAL);
if (dma_mapping_error(ioctx->dma))
goto out_free_buf;
return ioctx;
out_free_buf:
kfree(ioctx->buf);
out_free_ioctx:
kfree(ioctx);
out:
return NULL;
}
static void srpt_free_ioctx(struct srpt_device *sdev, struct srpt_ioctx *ioctx)
{
if (!ioctx)
return;
dma_unmap_single(sdev->device->dma_device, ioctx->dma,
MAX_MESSAGE_SIZE, DMA_BIDIRECTIONAL);
kfree(ioctx->buf);
kfree(ioctx);
}
static int srpt_alloc_ioctx_ring(struct srpt_device *sdev)
{
int i;
for (i = 0; i < SRPT_SRQ_SIZE; ++i) {
sdev->ioctx_ring[i] = srpt_alloc_ioctx(sdev);
if (!sdev->ioctx_ring[i])
goto err;
sdev->ioctx_ring[i]->index = i;
}
return 0;
err:
while (--i > 0) {
srpt_free_ioctx(sdev, sdev->ioctx_ring[i]);
sdev->ioctx_ring[i] = NULL;
}
return -ENOMEM;
}
static int srpt_post_recv(struct srpt_device *sdev, struct srpt_ioctx *ioctx)
{
struct ib_sge list;
struct ib_recv_wr wr, *bad_wr;
wr.wr_id = ioctx->index | SRPT_OP_RECV;
list.addr = ioctx->dma;
list.length = MAX_MESSAGE_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_post_send(struct srpt_rdma_ch *ch, struct srpt_ioctx *ioctx,
int len)
{
struct ib_sge list;
struct ib_send_wr wr, *bad_wr;
struct srpt_device *sdev = ch->sport->sdev;
dma_sync_single_for_device(sdev->device->dma_device, ioctx->dma,
MAX_MESSAGE_SIZE, DMA_TO_DEVICE);
list.addr = ioctx->dma;
list.length = len;
list.lkey = sdev->mr->lkey;
wr.next = NULL;
wr.wr_id = ioctx->index;
wr.sg_list = &list;
wr.num_sge = 1;
wr.opcode = IB_WR_SEND;
wr.send_flags = IB_SEND_SIGNALED;
return ib_post_send(ch->qp, &wr, &bad_wr);
}
static int srpt_get_desc_tbl(struct srpt_ioctx *ioctx, struct srp_cmd *srp_cmd,
int *ind)
{
struct srp_indirect_buf *idb;
struct srp_direct_buf *db;
*ind = 0;
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 = (void *)srp_cmd->add_data;
memcpy(ioctx->rbufs, db, sizeof *db);
ioctx->data_len = be32_to_cpu(db->len);
} else {
idb = (void *)srp_cmd->add_data;
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)) {
*ind = 1;
ioctx->n_rbuf = 0;
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;
return -ENOMEM;
}
db = idb->desc_list;
memcpy(ioctx->rbufs, db, ioctx->n_rbuf * sizeof *db);
ioctx->data_len = be32_to_cpu(idb->len);
}
out:
return 0;
}
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;
}
static int srpt_ch_qp_rtr_rts(struct srpt_rdma_ch *ch, struct ib_qp *qp,
enum ib_qp_state qp_state)
{
struct ib_qp_attr *qp_attr;
int attr_mask;
int ret;
qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
if (!qp_attr)
return -ENOMEM;
qp_attr->qp_state = qp_state;
ret = ib_cm_init_qp_attr(ch->cm_id, qp_attr, &attr_mask);
if (ret)
goto out;
if (qp_state == IB_QPS_RTR)
qp_attr->max_dest_rd_atomic = 4;
else
qp_attr->max_rd_atomic = 4;
ret = ib_modify_qp(qp, qp_attr, attr_mask);
out:
kfree(qp_attr);
return ret;
}
static void srpt_reset_ioctx(struct srpt_rdma_ch *ch, struct srpt_ioctx *ioctx)
{
int i;
if (ioctx->n_rdma_ius > 0 && ioctx->rdma_ius) {
struct rdma_iu *riu = ioctx->rdma_ius;
for (i = 0; i < ioctx->n_rdma_ius; ++i, ++riu)
kfree(riu->sge);
kfree(ioctx->rdma_ius);
}
if (ioctx->n_rbuf > 1)
kfree(ioctx->rbufs);
if (srpt_post_recv(ch->sport->sdev, ioctx))
printk(KERN_ERR PFX "SRQ post_recv failed - this is serious\n");
/* we should queue it back to free_ioctx queue */
else
atomic_inc(&ch->req_lim_delta);
}
static void srpt_handle_err_comp(struct srpt_rdma_ch *ch, struct ib_wc *wc)
{
struct srpt_ioctx *ioctx;
struct srpt_device *sdev = ch->sport->sdev;
scst_data_direction dir = SCST_DATA_NONE;
if (wc->wr_id & SRPT_OP_RECV) {
ioctx = sdev->ioctx_ring[wc->wr_id & ~SRPT_OP_RECV];
printk(KERN_ERR PFX "This is serious - SRQ is in bad state\n");
} else {
ioctx = sdev->ioctx_ring[wc->wr_id];
if (ioctx->scmnd) {
struct scst_cmd *scmnd = ioctx->scmnd;
dir = scst_cmd_get_data_direction(scmnd);
if (dir == SCST_DATA_NONE)
scst_tgt_cmd_done(scmnd);
else {
dma_unmap_sg(sdev->device->dma_device,
scst_cmd_get_sg(scmnd),
scst_cmd_get_sg_cnt(scmnd),
scst_to_tgt_dma_dir(dir));
if (scmnd->data_buf_tgt_alloc &&
scmnd->data_buf_alloced) {
kfree(scmnd->sg);
scmnd->sg = NULL;
scmnd->sg_cnt = 0;
}
if (scmnd->state == SCST_CMD_STATE_RDY_TO_XFER)
scst_rx_data(scmnd,
SCST_RX_STATUS_ERROR,
SCST_CONTEXT_THREAD);
else if (scmnd->state == SCST_CMD_STATE_XMIT_WAIT)
scst_tgt_cmd_done(scmnd);
}
} else
srpt_reset_ioctx(ch, ioctx);
}
}
static void srpt_handle_send_comp(struct srpt_rdma_ch *ch,
struct srpt_ioctx *ioctx)
{
if (ioctx->scmnd) {
scst_data_direction dir = scst_cmd_get_data_direction(ioctx->scmnd);
if (dir != SCST_DATA_NONE)
dma_unmap_sg(ch->sport->sdev->device->dma_device,
scst_cmd_get_sg(ioctx->scmnd),
scst_cmd_get_sg_cnt(ioctx->scmnd),
scst_to_tgt_dma_dir(dir));
if (ioctx->scmnd->data_buf_tgt_alloc &&
ioctx->scmnd->data_buf_alloced) {
kfree(ioctx->scmnd->sg);
ioctx->scmnd->sg = NULL;
ioctx->scmnd->sg_cnt = 0;
}
scst_tgt_cmd_done(ioctx->scmnd);
} else
srpt_reset_ioctx(ch, ioctx);
}
static void srpt_handle_rdma_comp(struct srpt_rdma_ch *ch,
struct srpt_ioctx *ioctx)
{
if (!ioctx->scmnd) {
srpt_reset_ioctx(ch, ioctx);
return;
}
if (scst_cmd_get_data_direction(ioctx->scmnd) == SCST_DATA_WRITE)
scst_rx_data(ioctx->scmnd, SCST_RX_STATUS_SUCCESS,
SCST_CONTEXT_THREAD);
}
static void srpt_build_cmd_rsp(struct srpt_rdma_ch *ch,
struct srpt_ioctx *ioctx, u8 s_key, u8 s_code,
u64 tag)
{
struct srp_rsp *srp_rsp;
struct sense_data *sense;
int limit_delta;
srp_rsp = ioctx->buf;
memset(srp_rsp, 0, sizeof *srp_rsp);
limit_delta = atomic_read(&ch->req_lim_delta);
atomic_sub(limit_delta, &ch->req_lim_delta);
srp_rsp->opcode = SRP_RSP;
srp_rsp->req_lim_delta = cpu_to_be32(limit_delta);
srp_rsp->tag = tag;
if (s_key != NO_SENSE) {
srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;
srp_rsp->status = SAM_STAT_CHECK_CONDITION;
srp_rsp->sense_data_len =
cpu_to_be32(sizeof *sense + (sizeof *sense % 4));
sense = (struct sense_data *)(srp_rsp + 1);
sense->err_code = 0x70;
sense->key = s_key;
sense->asc_ascq = s_code;
}
}
static void srpt_build_tskmgmt_rsp(struct srpt_rdma_ch *ch,
struct srpt_ioctx *ioctx, u8 rsp_code,
u64 tag)
{
struct srp_rsp *srp_rsp;
int limit_delta;
dma_sync_single_for_cpu(ch->sport->sdev->device->dma_device, ioctx->dma,
MAX_MESSAGE_SIZE, DMA_TO_DEVICE);
srp_rsp = ioctx->buf;
memset(srp_rsp, 0, sizeof *srp_rsp);
limit_delta = atomic_read(&ch->req_lim_delta);
atomic_sub(limit_delta, &ch->req_lim_delta);
srp_rsp->opcode = SRP_RSP;
srp_rsp->req_lim_delta = cpu_to_be32(limit_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(4);
srp_rsp->data[3] = rsp_code;
}
}
static void srpt_handle_new_iu(struct srpt_rdma_ch *ch,
struct srpt_ioctx *ioctx)
{
struct scst_cmd *scmnd = NULL;
struct srp_cmd *srp_cmd = NULL;
struct srp_tsk_mgmt *srp_tsk = NULL;
struct srpt_mgmt_ioctx *mgmt_ioctx;
scst_data_direction dir = SCST_DATA_NONE;
int indirect_desc = 0;
u8 op;
int ret;
if (ch->state != RDMA_CHANNEL_LIVE) {
if (ch->state == RDMA_CHANNEL_CONNECTING) {
spin_lock_irq(&ch->spinlock);
list_add_tail(&ioctx->wait_list, &ch->cmd_wait_list);
spin_unlock_irq(&ch->spinlock);
} else
srpt_reset_ioctx(ch, ioctx);
return;
}
dma_sync_single_for_cpu(ch->sport->sdev->device->dma_device, ioctx->dma,
MAX_MESSAGE_SIZE, DMA_FROM_DEVICE);
ioctx->data_len = 0;
ioctx->n_rbuf = 0;
ioctx->rbufs = NULL;
ioctx->n_rdma = 0;
ioctx->n_rdma_ius = 0;
ioctx->rdma_ius = NULL;
ioctx->scmnd = NULL;
op = *(u8 *) ioctx->buf;
switch (op) {
case SRP_CMD:
srp_cmd = ioctx->buf;
if (srp_cmd->buf_fmt) {
ret = srpt_get_desc_tbl(ioctx, srp_cmd, &indirect_desc);
if (ret) {
srpt_build_cmd_rsp(ch, ioctx, NO_SENSE,
NO_ADD_SENSE, srp_cmd->tag);
((struct srp_rsp *)ioctx->buf)->status =
SAM_STAT_TASK_SET_FULL;
goto send_rsp;
}
if (indirect_desc) {
srpt_build_cmd_rsp(ch, ioctx, NO_SENSE,
NO_ADD_SENSE, srp_cmd->tag);
((struct srp_rsp *)ioctx->buf)->status =
SAM_STAT_TASK_SET_FULL;
goto send_rsp;
}
if (srp_cmd->buf_fmt & 0xf)
dir = SCST_DATA_READ;
else if (srp_cmd->buf_fmt >> 4)
dir = SCST_DATA_WRITE;
else
dir = SCST_DATA_NONE;
} else
dir = SCST_DATA_NONE;
scmnd = scst_rx_cmd(ch->scst_sess, (u8 *) &srp_cmd->lun,
sizeof srp_cmd->lun, srp_cmd->cdb, 16,
thread ? SCST_NON_ATOMIC : SCST_ATOMIC);
if (!scmnd) {
srpt_build_cmd_rsp(ch, ioctx, NO_SENSE,
NO_ADD_SENSE, srp_cmd->tag);
((struct srp_rsp *)ioctx->buf)->status =
SAM_STAT_TASK_SET_FULL;
goto send_rsp;
}
ioctx->scmnd = scmnd;
switch (srp_cmd->task_attr) {
case SRP_CMD_HEAD_OF_Q:
scmnd->queue_type = SCST_CMD_QUEUE_HEAD_OF_QUEUE;
break;
case SRP_CMD_ORDERED_Q:
scmnd->queue_type = SCST_CMD_QUEUE_ORDERED;
break;
case SRP_CMD_SIMPLE_Q:
scmnd->queue_type = SCST_CMD_QUEUE_SIMPLE;
break;
case SRP_CMD_ACA:
scmnd->queue_type = SCST_CMD_QUEUE_ACA;
break;
default:
scmnd->queue_type = SCST_CMD_QUEUE_ORDERED;
break;
}
scst_cmd_set_tag(scmnd, srp_cmd->tag);
scst_cmd_set_tgt_priv(scmnd, ioctx);
scst_cmd_set_expected(scmnd, dir, ioctx->data_len);
spin_lock_irq(&ch->spinlock);
list_add_tail(&ioctx->scmnd_list, &ch->active_scmnd_list);
ch->active_scmnd_cnt++;
scst_cmd_init_done(scmnd, SCST_CONTEXT_THREAD);
spin_unlock_irq(&ch->spinlock);
break;
case SRP_TSK_MGMT:
srp_tsk = ioctx->buf;
printk(KERN_WARNING PFX
"recv_tsk_mgmt= %d for task_tag= %lld"
" using tag= %lld cm_id= %p sess= %p\n",
srp_tsk->tsk_mgmt_func,
(unsigned long long) srp_tsk->task_tag,
(unsigned long long) srp_tsk->tag,
ch->cm_id, ch->scst_sess);
mgmt_ioctx = kmalloc(sizeof *mgmt_ioctx, GFP_ATOMIC);
if (!mgmt_ioctx) {
srpt_build_tskmgmt_rsp(ch, ioctx, SRP_TSK_MGMT_FAILED,
srp_tsk->tag);
goto send_rsp;
}
mgmt_ioctx->ioctx = ioctx;
mgmt_ioctx->ch = ch;
mgmt_ioctx->tag = srp_tsk->tag;
switch (srp_tsk->tsk_mgmt_func) {
case SRP_TSK_ABORT_TASK:
ret = scst_rx_mgmt_fn_tag(ch->scst_sess,
SCST_ABORT_TASK,
srp_tsk->task_tag,
thread ? SCST_NON_ATOMIC : SCST_ATOMIC,
mgmt_ioctx);
break;
case SRP_TSK_ABORT_TASK_SET:
ret = scst_rx_mgmt_fn_lun(ch->scst_sess,
SCST_ABORT_TASK_SET,
(u8 *) &srp_tsk->lun,
sizeof srp_tsk->lun,
thread ? SCST_NON_ATOMIC : SCST_ATOMIC,
mgmt_ioctx);
break;
case SRP_TSK_CLEAR_TASK_SET:
ret = scst_rx_mgmt_fn_lun(ch->scst_sess,
SCST_CLEAR_TASK_SET,
(u8 *) &srp_tsk->lun,
sizeof srp_tsk->lun,
thread ? SCST_NON_ATOMIC : SCST_ATOMIC,
mgmt_ioctx);
break;
#if 0
case SRP_TSK_LUN_RESET:
ret = scst_rx_mgmt_fn_lun(ch->scst_sess,
SCST_LUN_RESET,
(u8 *) &srp_tsk->lun,
sizeof srp_tsk->lun,
thread ? SCST_NON_ATOMIC : SCST_ATOMIC,
mgmt_ioctx);
break;
#endif
case SRP_TSK_CLEAR_ACA:
ret = scst_rx_mgmt_fn_lun(ch->scst_sess,
SCST_CLEAR_ACA,
(u8 *) &srp_tsk->lun,
sizeof srp_tsk->lun,
thread ? SCST_NON_ATOMIC : SCST_ATOMIC,
mgmt_ioctx);
break;
default:
srpt_build_tskmgmt_rsp(ch, ioctx,
SRP_TSK_MGMT_FUNC_NOT_SUPP,
srp_tsk->tag);
goto send_rsp;
}
break;
case SRP_I_LOGOUT:
case SRP_AER_REQ:
default:
srpt_build_cmd_rsp(ch, ioctx, ILLEGAL_REQUEST, INVALID_CDB,
((struct srp_cmd *)ioctx->buf)->tag);
goto send_rsp;
}
dma_sync_single_for_device(ch->sport->sdev->device->dma_device,
ioctx->dma, MAX_MESSAGE_SIZE,
DMA_FROM_DEVICE);
return;
send_rsp:
if (ch->state != RDMA_CHANNEL_LIVE ||
srpt_post_send(ch, ioctx,
sizeof(struct srp_rsp) +
be32_to_cpu(((struct srp_rsp *)ioctx->buf)->
sense_data_len)))
srpt_reset_ioctx(ch, ioctx);
}
static inline int srpt_test_ioctx_list(void)
{
int res = (!list_empty(&srpt_thread.thread_ioctx_list) ||
unlikely(kthread_should_stop()));
return res;
}
static inline void srpt_schedule_thread(struct srpt_ioctx *ioctx)
{
unsigned long flags;
spin_lock_irqsave(&srpt_thread.thread_lock, flags);
list_add_tail(&ioctx->comp_list, &srpt_thread.thread_ioctx_list);
spin_unlock_irqrestore(&srpt_thread.thread_lock, flags);
wake_up(&ioctx_list_waitQ);
}
static void srpt_completion(struct ib_cq *cq, void *ctx)
{
struct srpt_rdma_ch *ch = ctx;
struct srpt_device *sdev = ch->sport->sdev;
struct ib_wc wc;
struct srpt_ioctx *ioctx;
ib_req_notify_cq(ch->cq, IB_CQ_NEXT_COMP);
while (ib_poll_cq(ch->cq, 1, &wc) > 0) {
if (wc.status) {
printk(KERN_ERR PFX "failed %s status= %d\n",
wc.wr_id & SRPT_OP_RECV ? "receive" : "send",
wc.status);
srpt_handle_err_comp(ch, &wc);
break;
}
if (wc.wr_id & SRPT_OP_RECV) {
ioctx = sdev->ioctx_ring[wc.wr_id & ~SRPT_OP_RECV];
if (thread) {
ioctx->ch = ch;
ioctx->op = IB_WC_RECV;
srpt_schedule_thread(ioctx);
} else
srpt_handle_new_iu(ch, ioctx);
continue;
} else
ioctx = sdev->ioctx_ring[wc.wr_id];
if (thread) {
ioctx->ch = ch;
ioctx->op = wc.opcode;
srpt_schedule_thread(ioctx);
} else {
switch (wc.opcode) {
case IB_WC_SEND:
srpt_handle_send_comp(ch, ioctx);
break;
case IB_WC_RDMA_WRITE:
case IB_WC_RDMA_READ:
srpt_handle_rdma_comp(ch, ioctx);
break;
default:
break;
}
}
}
}
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 cqe;
int ret;
qp_init = kzalloc(sizeof *qp_init, GFP_KERNEL);
if (!qp_init)
return -ENOMEM;
cqe = SRPT_RQ_SIZE + SRPT_SQ_SIZE - 1;
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)
ch->cq = ib_create_cq(sdev->device, srpt_completion, NULL, ch, cqe);
#else
ch->cq = ib_create_cq(sdev->device, srpt_completion, NULL, ch, cqe, 0);
#endif
if (IS_ERR(ch->cq)) {
ret = PTR_ERR(ch->cq);
printk(KERN_ERR PFX "failed to create_cq cqe= %d ret= %d\n",
cqe, ret);
goto out;
}
ib_req_notify_cq(ch->cq, IB_CQ_NEXT_COMP);
qp_init->qp_context = (void *)ch;
qp_init->event_handler = 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;
qp_init->cap.max_send_sge = SRPT_DEF_SG_PER_WQE;
ch->qp = ib_create_qp(sdev->pd, qp_init);
if (IS_ERR(ch->qp)) {
ret = PTR_ERR(ch->qp);
ib_destroy_cq(ch->cq);
printk(KERN_ERR PFX "failed to create_qp ret= %d\n", ret);
goto out;
}
printk(KERN_DEBUG PFX "%s[%d] max_cqe= %d max_sge= %d cm_id= %p\n",
__func__, __LINE__, ch->cq->cqe, qp_init->cap.max_send_sge,
ch->cm_id);
ret = srpt_init_ch_qp(ch, ch->qp);
if (ret) {
ib_destroy_qp(ch->qp);
ib_destroy_cq(ch->cq);
goto out;
}
atomic_set(&ch->req_lim_delta, SRPT_RQ_SIZE);
out:
kfree(qp_init);
return ret;
}
static struct srpt_rdma_ch *srpt_find_channel(struct ib_cm_id *cm_id)
{
struct srpt_device *sdev = cm_id->context;
struct srpt_rdma_ch *ch, *tmp_ch;
spin_lock_irq(&sdev->spinlock);
list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) {
if (ch->cm_id == cm_id) {
spin_unlock_irq(&sdev->spinlock);
return ch;
}
}
spin_unlock_irq(&sdev->spinlock);
return NULL;
}
static int srpt_release_channel(struct srpt_rdma_ch *ch, int destroy_cmid)
{
spin_lock_irq(&ch->sport->sdev->spinlock);
list_del(&ch->list);
spin_unlock_irq(&ch->sport->sdev->spinlock);
if (ch->cm_id && destroy_cmid) {
printk(KERN_WARNING PFX
"%s Destroy cm_id= %p\n", __func__, ch->cm_id);
ib_destroy_cm_id(ch->cm_id);
ch->cm_id = NULL;
}
ib_destroy_qp(ch->qp);
ib_destroy_cq(ch->cq);
if (ch->scst_sess) {
struct srpt_ioctx *ioctx, *ioctx_tmp;
printk(KERN_WARNING PFX
"%s: Release sess= %p sess_name= %s active_cmd= %d\n",
__func__, ch->scst_sess, ch->sess_name,
ch->active_scmnd_cnt);
list_for_each_entry_safe(ioctx, ioctx_tmp,
&ch->active_scmnd_list, scmnd_list) {
list_del(&ioctx->scmnd_list);
ch->active_scmnd_cnt--;
}
scst_unregister_session(ch->scst_sess, 0, NULL);
ch->scst_sess = NULL;
}
kfree(ch);
return (destroy_cmid ? 0 : 1);
}
static void srpt_register_channel_done(struct scst_session *scst_sess,
void *data, int status)
{
struct srpt_rdma_ch *ch = data;
BUG_ON(!ch);
if (status) {
if (ch->scst_sess) {
scst_unregister_session(ch->scst_sess, 0, NULL);
ch->scst_sess = NULL;
}
printk(KERN_ERR PFX
"%s[%d] Failed to establish sess= %p status= %d\n",
__func__, __LINE__, scst_sess, status);
}
complete(&ch->scst_sess_done);
}
static int srpt_disconnect_channel(struct srpt_rdma_ch *ch, int dreq)
{
spin_lock_irq(&ch->spinlock);
ch->state = RDMA_CHANNEL_DISCONNECTING;
spin_unlock_irq(&ch->spinlock);
if (dreq)
ib_send_cm_dreq(ch->cm_id, NULL, 0);
else
ib_send_cm_drep(ch->cm_id, NULL, 0);
return 0;
}
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, *tmp_ch;
u32 it_iu_len;
int ret = 0;
if (!sdev || !private_data)
return -EINVAL;
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;
}
req = (struct srp_login_req *)private_data;
it_iu_len = be32_to_cpu(req->req_it_iu_len);
printk(KERN_ERR PFX
"Host login i_port_id=0x%llx:0x%llx t_port_id=0x%llx:0x%llx"
" it_iu_len=%d\n",
(unsigned long long)be64_to_cpu(*(u64 *)&req->initiator_port_id[0]),
(unsigned long long)be64_to_cpu(*(u64 *)&req->initiator_port_id[8]),
(unsigned long long)be64_to_cpu(*(u64 *)&req->target_port_id[0]),
(unsigned long long)be64_to_cpu(*(u64 *)&req->target_port_id[8]), it_iu_len);
if (it_iu_len > MAX_MESSAGE_SIZE || it_iu_len < 64) {
rej->reason =
cpu_to_be32(SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE);
ret = -EINVAL;
printk(KERN_WARNING PFX
"Reject invalid it_iu_len=%d\n", it_iu_len);
goto reject;
}
if ((req->req_flags & 0x3) == SRP_MULTICHAN_SINGLE) {
rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_NO_CHAN;
spin_lock_irq(&sdev->spinlock);
list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list) {
if (!memcmp(ch->i_port_id, req->initiator_port_id, 16)
&& !memcmp(ch->t_port_id, req->target_port_id, 16)
&& param->port == ch->sport->port
&& param->listen_id == ch->sport->sdev->cm_id
&& ch->cm_id) {
/* found an existing channel */
printk(KERN_WARNING PFX
"Found existing channel name= %s"
" cm_id= %p state= %d\n",
ch->sess_name, ch->cm_id, ch->state);
spin_unlock_irq(&sdev->spinlock);
rsp->rsp_flags =
SRP_LOGIN_RSP_MULTICHAN_TERMINATED;
if (ch->state == RDMA_CHANNEL_LIVE)
srpt_disconnect_channel(ch, 1);
else if (ch->state == RDMA_CHANNEL_CONNECTING) {
ib_send_cm_rej(ch->cm_id,
IB_CM_REJ_NO_RESOURCES,
NULL, 0, NULL, 0);
srpt_release_channel(ch, 1);
}
spin_lock_irq(&sdev->spinlock);
}
}
spin_unlock_irq(&sdev->spinlock);
} else
rsp->rsp_flags = SRP_LOGIN_RSP_MULTICHAN_MAINTAINED;
if (((u64) (*(u64 *) req->target_port_id) !=
cpu_to_be64(mellanox_ioc_guid)) ||
((u64) (*(u64 *) (req->target_port_id + 8)) !=
cpu_to_be64(mellanox_ioc_guid))) {
rej->reason =
cpu_to_be32(SRP_LOGIN_REJ_UNABLE_ASSOCIATE_CHANNEL);
ret = -ENOMEM;
printk(KERN_WARNING PFX "Reject invalid target_port_id\n");
goto reject;
}
ch = kzalloc(sizeof *ch, GFP_KERNEL);
if (!ch) {
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
printk(KERN_WARNING PFX "Reject failed allocate rdma_ch\n");
ret = -ENOMEM;
goto reject;
}
spin_lock_init(&ch->spinlock);
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;
ch->state = RDMA_CHANNEL_CONNECTING;
INIT_LIST_HEAD(&ch->cmd_wait_list);
INIT_LIST_HEAD(&ch->active_scmnd_list);
ret = srpt_create_ch_ib(ch);
if (ret) {
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
printk(KERN_WARNING PFX "Reject failed to create rdma_ch\n");
goto free_ch;
}
ret = srpt_ch_qp_rtr_rts(ch, ch->qp, IB_QPS_RTR);
if (ret) {
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
printk(KERN_WARNING PFX "Reject failed qp to rtr/rts ret=%d\n", ret);
goto destroy_ib;
}
init_completion(&ch->scst_sess_done);
sprintf(ch->sess_name, "0x%016llx%016llx",
(unsigned long long)be64_to_cpu(*(u64 *)ch->i_port_id),
(unsigned long long)be64_to_cpu(*(u64 *)(ch->i_port_id + 8)));
ch->scst_sess =
scst_register_session(sdev->scst_tgt, 1, ch->sess_name,
ch, srpt_register_channel_done);
wait_for_completion(&ch->scst_sess_done);
if (!ch->scst_sess) {
rej->reason = cpu_to_be32(SRP_LOGIN_REJ_INSUFFICIENT_RESOURCES);
printk(KERN_WARNING PFX "Reject failed to create scst sess");
goto destroy_ib;
}
spin_lock_irq(&sdev->spinlock);
list_add_tail(&ch->list, &sdev->rch_list);
spin_unlock_irq(&sdev->spinlock);
printk(KERN_DEBUG PFX "Establish connection sess= %p name= %s cm_id= %p\n",
ch->scst_sess, ch->sess_name, ch->cm_id);
scst_sess_set_tgt_priv(ch->scst_sess, ch);
/* 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;
rsp->buf_fmt =
cpu_to_be16(SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT);
rsp->req_lim_delta = cpu_to_be32(SRPT_RQ_SIZE);
atomic_set(&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;
ret = ib_send_cm_rep(cm_id, rep_param);
if (ret)
srpt_release_channel(ch, 0);
goto out;
destroy_ib:
ib_destroy_qp(ch->qp);
ib_destroy_cq(ch->cq);
free_ch:
kfree(ch);
reject:
rej->opcode = SRP_LOGIN_REJ;
rej->tag = req->tag;
rej->buf_fmt =
cpu_to_be16(SRP_BUF_FORMAT_DIRECT | SRP_BUF_FORMAT_INDIRECT);
ret = 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 int srpt_find_and_release_channel(struct ib_cm_id *cm_id)
{
struct srpt_rdma_ch *ch;
ch = srpt_find_channel(cm_id);
if (!ch)
return -EINVAL;
return srpt_release_channel(ch, 0);
}
static int srpt_cm_rej_recv(struct ib_cm_id *cm_id)
{
printk(KERN_DEBUG PFX "%s[%d] cm_id= %p\n",
__func__, __LINE__, cm_id);
return srpt_find_and_release_channel(cm_id);
}
static int srpt_cm_rtu_recv(struct ib_cm_id *cm_id)
{
struct srpt_rdma_ch *ch;
int ret;
ch = srpt_find_channel(cm_id);
if (!ch)
return -EINVAL;
if (ch->state == RDMA_CHANNEL_CONNECTING) {
struct srpt_ioctx *ioctx, *ioctx_tmp;
spin_lock_irq(&ch->spinlock);
ch->state = RDMA_CHANNEL_LIVE;
spin_unlock_irq(&ch->spinlock);
ret = srpt_ch_qp_rtr_rts(ch, ch->qp, IB_QPS_RTS);
list_for_each_entry_safe(ioctx, ioctx_tmp, &ch->cmd_wait_list,
wait_list) {
list_del(&ioctx->wait_list);
srpt_handle_new_iu(ch, ioctx);
}
} else if (ch->state == RDMA_CHANNEL_DISCONNECTING)
ret = -EAGAIN;
else
ret = 0;
if (ret) {
printk(KERN_ERR PFX "%s[%d] cm_id= %p sess_name= %s state= %d\n",
__func__, __LINE__, cm_id, ch->sess_name, ch->state);
srpt_disconnect_channel(ch, 1);
}
return ret;
}
static int srpt_cm_timewait_exit(struct ib_cm_id *cm_id)
{
printk(KERN_DEBUG PFX "%s[%d] cm_id= %p\n",
__func__, __LINE__, cm_id);
return srpt_find_and_release_channel(cm_id);
}
static int srpt_cm_rep_error(struct ib_cm_id *cm_id)
{
printk(KERN_DEBUG PFX "%s[%d] cm_id= %p\n",
__func__, __LINE__, cm_id);
return srpt_find_and_release_channel(cm_id);
}
static int srpt_cm_dreq_recv(struct ib_cm_id *cm_id)
{
struct srpt_rdma_ch *ch;
int ret = 0;
ch = srpt_find_channel(cm_id);
if (!ch)
return -EINVAL;
printk(KERN_DEBUG PFX "%s[%d] cm_id= %p ch->state= %d\n",
__func__, __LINE__, cm_id, ch->state);
switch (ch->state) {
case RDMA_CHANNEL_LIVE:
case RDMA_CHANNEL_CONNECTING:
ret = srpt_disconnect_channel(ch, 0);
break;
case RDMA_CHANNEL_DISCONNECTING:
default:
break;
}
return ret;
}
static int srpt_cm_drep_recv(struct ib_cm_id *cm_id)
{
printk(KERN_DEBUG PFX "%s[%d] cm_id= %p\n",
__func__, __LINE__, cm_id);
return srpt_find_and_release_channel(cm_id);
}
static int srpt_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
{
int 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:
ret = srpt_cm_rej_recv(cm_id);
break;
case IB_CM_RTU_RECEIVED:
case IB_CM_USER_ESTABLISHED:
ret = srpt_cm_rtu_recv(cm_id);
break;
case IB_CM_DREQ_RECEIVED:
ret = srpt_cm_dreq_recv(cm_id);
break;
case IB_CM_DREP_RECEIVED:
ret = srpt_cm_drep_recv(cm_id);
break;
case IB_CM_TIMEWAIT_EXIT:
ret = srpt_cm_timewait_exit(cm_id);
break;
case IB_CM_REP_ERROR:
ret = srpt_cm_rep_error(cm_id);
break;
default:
break;
}
return ret;
}
static int srpt_map_sg_to_ib_sge(struct srpt_rdma_ch *ch,
struct srpt_ioctx *ioctx,
struct scst_cmd *scmnd)
{
struct scatterlist *scat;
scst_data_direction dir;
struct rdma_iu *riu;
struct srp_direct_buf *db;
dma_addr_t dma_addr;
struct ib_sge *sge;
u64 raddr;
u32 rsize;
u32 tsize;
u32 dma_len;
int count, nrdma;
int i, j, k;
scat = scst_cmd_get_sg(scmnd);
dir = scst_cmd_get_data_direction(scmnd);
count = dma_map_sg(ch->sport->sdev->device->dma_device, scat,
scst_cmd_get_sg_cnt(scmnd),
scst_to_tgt_dma_dir(dir));
if (unlikely(!count))
return -EBUSY;
if (ioctx->rdma_ius && ioctx->n_rdma_ius)
nrdma = ioctx->n_rdma_ius;
else {
nrdma = count / SRPT_DEF_SG_PER_WQE + ioctx->n_rbuf;
ioctx->rdma_ius = kzalloc(nrdma * sizeof *riu,
scst_cmd_atomic(scmnd)
? GFP_ATOMIC : GFP_KERNEL);
if (!ioctx->rdma_ius) {
dma_unmap_sg(ch->sport->sdev->device->dma_device,
scat, scst_cmd_get_sg_cnt(scmnd),
scst_to_tgt_dma_dir(dir));
return -ENOMEM;
}
ioctx->n_rdma_ius = nrdma;
}
db = ioctx->rbufs;
tsize = (dir == SCST_DATA_READ) ?
scst_cmd_get_resp_data_len(scmnd) : scst_cmd_get_bufflen(scmnd);
dma_len = sg_dma_len(&scat[0]);
riu = ioctx->rdma_ius;
/*
* 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;
/* 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(&scat[j]);
}
} else {
tsize -= rsize;
dma_len -= rsize;
rsize = 0;
}
++riu->sge_cnt;
if (rsize > 0 && riu->sge_cnt == SRPT_DEF_SG_PER_WQE) {
riu->sge =
kmalloc(riu->sge_cnt * sizeof *riu->sge,
scst_cmd_atomic(scmnd)
? GFP_ATOMIC : GFP_KERNEL);
if (!riu->sge)
goto free_mem;
++ioctx->n_rdma;
++riu;
riu->sge_cnt = 0;
riu->raddr = raddr;
riu->rkey = be32_to_cpu(db->key);
}
}
riu->sge = kmalloc(riu->sge_cnt * sizeof *riu->sge,
scst_cmd_atomic(scmnd)
? GFP_ATOMIC : GFP_KERNEL);
if (!riu->sge)
goto free_mem;
++ioctx->n_rdma;
}
db = ioctx->rbufs;
scat = scst_cmd_get_sg(scmnd);
tsize = (dir == SCST_DATA_READ) ?
scst_cmd_get_resp_data_len(scmnd) : scst_cmd_get_bufflen(scmnd);
riu = ioctx->rdma_ius;
dma_len = sg_dma_len(&scat[0]);
dma_addr = sg_dma_address(&scat[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(&scat[j]);
dma_addr = sg_dma_address(&scat[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) {
++riu;
sge = riu->sge;
k = 0;
} else if (rsize > 0)
++sge;
}
}
return 0;
free_mem:
while (ioctx->n_rdma)
kfree(ioctx->rdma_ius[ioctx->n_rdma--].sge);
kfree(ioctx->rdma_ius);
dma_unmap_sg(ch->sport->sdev->device->dma_device,
scat, scst_cmd_get_sg_cnt(scmnd),
scst_to_tgt_dma_dir(dir));
return -ENOMEM;
}
static int srpt_perform_rdmas(struct srpt_rdma_ch *ch, struct srpt_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 = 0;
riu = ioctx->rdma_ius;
memset(&wr, 0, sizeof wr);
for (i = 0; i < ioctx->n_rdma; ++i, ++riu) {
wr.opcode = (dir == SCST_DATA_READ) ?
IB_WR_RDMA_WRITE : IB_WR_RDMA_READ;
wr.next = NULL;
wr.wr_id = ioctx->index;
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 == (ioctx->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;
}
return ret;
}
static int srpt_xfer_data(struct srpt_rdma_ch *ch, struct srpt_ioctx *ioctx,
struct scst_cmd *scmnd)
{
int ret;
ret = srpt_map_sg_to_ib_sge(ch, ioctx, scmnd);
if (ret) {
printk(KERN_ERR PFX "%s[%d] ret= %d\n", __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) {
printk(KERN_ERR PFX "%s[%d] ret= %d\n",
__func__, __LINE__, ret);
if (ret == -EAGAIN || ret == -ENOMEM)
ret = SCST_TGT_RES_QUEUE_FULL;
else
ret = SCST_TGT_RES_FATAL_ERROR;
goto out;
}
ret = SCST_TGT_RES_SUCCESS;
out:
return ret;
}
static int srpt_rdy_to_xfer(struct scst_cmd *scmnd)
{
struct srpt_rdma_ch *ch;
struct srpt_ioctx *ioctx;
ioctx = scst_cmd_get_tgt_priv(scmnd);
BUG_ON(!ioctx);
ch = scst_sess_get_tgt_priv(scst_cmd_get_session(scmnd));
BUG_ON(!ch);
if (ch->state == RDMA_CHANNEL_DISCONNECTING)
return SCST_TGT_RES_FATAL_ERROR;
else if (ch->state == RDMA_CHANNEL_CONNECTING)
return SCST_TGT_RES_QUEUE_FULL;
return srpt_xfer_data(ch, ioctx, scmnd);
}
static int srpt_xmit_response(struct scst_cmd *scmnd)
{
struct srpt_rdma_ch *ch;
struct srpt_ioctx *ioctx;
struct srp_rsp *srp_rsp;
u64 tag;
int ret = SCST_TGT_RES_SUCCESS;
int dir;
int status;
ioctx = scst_cmd_get_tgt_priv(scmnd);
BUG_ON(!ioctx);
ch = scst_sess_get_tgt_priv(scst_cmd_get_session(scmnd));
BUG_ON(!ch);
tag = scst_cmd_get_tag(scmnd);
if (ch->state != RDMA_CHANNEL_LIVE) {
printk(KERN_ERR PFX
"%s[%d] tag= %lld channel in bad state %d\n",
__func__, __LINE__, (unsigned long long)tag, ch->state);
if (ch->state == RDMA_CHANNEL_DISCONNECTING)
ret = SCST_TGT_RES_FATAL_ERROR;
else if (ch->state == RDMA_CHANNEL_CONNECTING)
ret = SCST_TGT_RES_QUEUE_FULL;
if (unlikely(scst_cmd_aborted(scmnd))) {
scst_set_delivery_status(scmnd, SCST_CMD_DELIVERY_ABORTED);
ret = SCST_TGT_RES_SUCCESS;
}
goto out;
}
dma_sync_single_for_cpu(ch->sport->sdev->device->dma_device, ioctx->dma,
MAX_MESSAGE_SIZE, DMA_TO_DEVICE);
srp_rsp = ioctx->buf;
if (unlikely(scst_cmd_aborted(scmnd))) {
printk(KERN_ERR PFX
"%s[%d] tag= %lld already get aborted\n",
__func__, __LINE__, (unsigned long long)tag);
scst_set_delivery_status(ioctx->scmnd, SCST_CMD_DELIVERY_ABORTED);
scst_tgt_cmd_done(ioctx->scmnd);
goto out;
}
dir = scst_cmd_get_data_direction(scmnd);
status = scst_cmd_get_status(scmnd) & 0xff;
srpt_build_cmd_rsp(ch, ioctx, NO_SENSE, NO_ADD_SENSE, tag);
if (SCST_SENSE_VALID(scst_cmd_get_sense_buffer(scmnd))) {
srp_rsp->sense_data_len = scst_cmd_get_sense_buffer_len(scmnd);
if (srp_rsp->sense_data_len >
(MAX_MESSAGE_SIZE - sizeof *srp_rsp))
srp_rsp->sense_data_len =
MAX_MESSAGE_SIZE - sizeof *srp_rsp;
memcpy((u8 *) (srp_rsp + 1), scst_cmd_get_sense_buffer(scmnd),
srp_rsp->sense_data_len);
srp_rsp->sense_data_len = cpu_to_be32(srp_rsp->sense_data_len);
srp_rsp->flags |= SRP_RSP_FLAG_SNSVALID;
if (!status)
status = SAM_STAT_CHECK_CONDITION;
}
srp_rsp->status = status;
/* transfer read data if any */
if (dir == SCST_DATA_READ && scst_cmd_get_resp_data_len(scmnd)) {
ret = srpt_xfer_data(ch, ioctx, scmnd);
if (ret != SCST_TGT_RES_SUCCESS) {
printk(KERN_ERR PFX
"%s[%d] tag= %lld xfer_data failed\n",
__func__, __LINE__, (unsigned long long)tag);
goto out;
}
}
if (srpt_post_send(ch, ioctx,
sizeof *srp_rsp +
be32_to_cpu(srp_rsp->sense_data_len))) {
printk(KERN_ERR PFX "%s[%d] ch->state= %d tag= %lld\n",
__func__, __LINE__, ch->state,
(unsigned long long)tag);
ret = SCST_TGT_RES_FATAL_ERROR;
}
out:
return ret;
}
static void srpt_tsk_mgmt_done(struct scst_mgmt_cmd *mcmnd)
{
struct srpt_rdma_ch *ch;
struct srpt_mgmt_ioctx *mgmt_ioctx;
struct srpt_ioctx *ioctx;
mgmt_ioctx = scst_mgmt_cmd_get_tgt_priv(mcmnd);
BUG_ON(!mgmt_ioctx);
ch = mgmt_ioctx->ch;
BUG_ON(!ch);
ioctx = mgmt_ioctx->ioctx;
BUG_ON(!ioctx);
printk(KERN_WARNING PFX
"%s[%d] tsk_mgmt_done for tag= %lld status=%d\n",
__func__, __LINE__, (unsigned long long)mgmt_ioctx->tag,
scst_mgmt_cmd_get_status(mcmnd));
srpt_build_tskmgmt_rsp(ch, ioctx,
(scst_mgmt_cmd_get_status(mcmnd) ==
SCST_MGMT_STATUS_SUCCESS) ? SRP_TSK_MGMT_SUCCESS
: SRP_TSK_MGMT_FAILED, mgmt_ioctx->tag);
srpt_post_send(ch, ioctx, sizeof(struct srp_rsp) + 4);
scst_mgmt_cmd_set_tgt_priv(mcmnd, NULL);
kfree(mgmt_ioctx);
}
static void srpt_on_free_cmd(struct scst_cmd *scmnd)
{
struct srpt_rdma_ch *ch;
struct srpt_ioctx *ioctx;
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_irq(&ch->spinlock);
list_del(&ioctx->scmnd_list);
ch->active_scmnd_cnt--;
spin_unlock_irq(&ch->spinlock);
srpt_reset_ioctx(ch, ioctx);
scst_cmd_set_tgt_priv(scmnd, NULL);
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 20)
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)
struct srpt_port *sport = (struct srpt_port *)ctx;
#else
struct srpt_port *sport = container_of(work, struct srpt_port, work);
#endif
srpt_refresh_port(sport);
}
static int srpt_detect(struct scst_tgt_template *tp)
{
struct srpt_device *sdev;
struct srpt_port *sport;
int i;
int count = 0;
list_for_each_entry(sdev, &srpt_devices, list) {
sdev->scst_tgt = scst_register(tp, NULL);
if (!sdev->scst_tgt)
goto out;
scst_tgt_set_tgt_priv(sdev->scst_tgt, sdev);
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)
INIT_WORK(&sport->work, srpt_refresh_port_work, sport);
#else
INIT_WORK(&sport->work, srpt_refresh_port_work);
#endif
if (srpt_refresh_port(sport)) {
scst_unregister(sdev->scst_tgt);
goto out;
}
}
++count;
}
out:
return count;
}
static int srpt_release(struct scst_tgt *scst_tgt)
{
struct srpt_device *sdev = scst_tgt_get_tgt_priv(scst_tgt);
struct srpt_port *sport;
struct srpt_rdma_ch *ch, *tmp_ch;
struct ib_port_modify port_modify = {
.clr_port_cap_mask = IB_PORT_DEVICE_MGMT_SUP
};
int i;
list_for_each_entry_safe(ch, tmp_ch, &sdev->rch_list, list)
srpt_release_channel(ch, 1);
for (i = 1; i <= sdev->device->phys_port_cnt; i++) {
sport = &sdev->port[i - 1];
ib_modify_port(sdev->device, sport->port, 0, &port_modify);
ib_unregister_mad_agent(sport->mad_agent);
}
scst_tgt_set_tgt_priv(scst_tgt, NULL);
complete(&sdev->scst_released);
return 0;
}
int srpt_ioctx_thread(void *arg)
{
struct srpt_ioctx *ioctx;
current->flags |= PF_NOFREEZE;
spin_lock_irq(&srpt_thread.thread_lock);
while (!kthread_should_stop()) {
wait_queue_t wait;
init_waitqueue_entry(&wait, current);
if (!srpt_test_ioctx_list()) {
add_wait_queue_exclusive(&ioctx_list_waitQ, &wait);
for (;;) {
set_current_state(TASK_INTERRUPTIBLE);
if (srpt_test_ioctx_list())
break;
spin_unlock_irq(&srpt_thread.thread_lock);
schedule();
spin_lock_irq(&srpt_thread.thread_lock);
}
set_current_state(TASK_RUNNING);
remove_wait_queue(&ioctx_list_waitQ, &wait);
}
while (!list_empty(&srpt_thread.thread_ioctx_list)) {
ioctx = list_entry(srpt_thread.thread_ioctx_list.next,
struct srpt_ioctx, comp_list);
list_del(&ioctx->comp_list);
spin_unlock_irq(&srpt_thread.thread_lock);
switch (ioctx->op) {
case IB_WC_SEND:
srpt_handle_send_comp(ioctx->ch, ioctx);
break;
case IB_WC_RDMA_WRITE:
case IB_WC_RDMA_READ:
srpt_handle_rdma_comp(ioctx->ch, ioctx);
break;
case IB_WC_RECV:
srpt_handle_new_iu(ioctx->ch, ioctx);
break;
default:
break;
}
spin_lock_irq(&srpt_thread.thread_lock);
}
}
spin_unlock_irq(&srpt_thread.thread_lock);
return 0;
}
struct scst_tgt_template srpt_template = {
.name = DRV_NAME,
.sg_tablesize = SRPT_DEF_SG_TABLESIZE,
.xmit_response_atomic = 1,
.rdy_to_xfer_atomic = 1,
.no_proc_entry = 1,
.detect = srpt_detect,
.release = srpt_release,
.xmit_response = srpt_xmit_response,
.rdy_to_xfer = srpt_rdy_to_xfer,
.on_free_cmd = srpt_on_free_cmd,
.task_mgmt_fn_done = srpt_tsk_mgmt_done
};
static void srpt_release_class_dev(struct class_device *class_dev)
{
}
static struct class srpt_class = {
.name = "infiniband_srpt",
.release = srpt_release_class_dev
};
static ssize_t show_login_info(struct class_device *class_dev, char *buf)
{
struct srpt_device *sdev =
container_of(class_dev, struct srpt_device, class_dev);
struct srpt_port *sport;
int i;
int len = 0;
for (i = 0; i < sdev->device->phys_port_cnt; i++) {
sport = &sdev->port[i];
len += sprintf(buf,
"tid_ext=%016llx,ioc_guid=%016llx,pkey=ffff,"
"dgid=%04x%04x%04x%04x%04x%04x%04x%04x,service_id=%016llx\n",
(unsigned long long) mellanox_ioc_guid,
(unsigned long long) mellanox_ioc_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]),
(unsigned long long) mellanox_ioc_guid);
buf += len;
}
return len;
}
static CLASS_DEVICE_ATTR(login_info, S_IRUGO, show_login_info, NULL);
static void srpt_add_one(struct ib_device *device)
{
struct srpt_device *sdev;
struct ib_srq_init_attr srq_attr;
int i;
sdev = kzalloc(sizeof *sdev, GFP_KERNEL);
if (!sdev)
return;
sdev->device = device;
init_completion(&sdev->scst_released);
sdev->class_dev.class = &srpt_class;
sdev->class_dev.dev = device->dma_device;
snprintf(sdev->class_dev.class_id, BUS_ID_SIZE, "srpt-%s", device->name);
if (class_device_register(&sdev->class_dev))
goto free_dev;
if (class_device_create_file(&sdev->class_dev, &class_device_attr_login_info))
goto err_class;
if (ib_query_device(device, &sdev->dev_attr))
goto err_class;
sdev->pd = ib_alloc_pd(device);
if (IS_ERR(sdev->pd))
goto err_class;
sdev->mr = ib_get_dma_mr(sdev->pd, IB_ACCESS_LOCAL_WRITE);
if (IS_ERR(sdev->mr))
goto err_pd;
srq_attr.event_handler = srpt_srq_event;
srq_attr.srq_context = (void *)sdev;
srq_attr.attr.max_wr = min(SRPT_SRQ_SIZE, sdev->dev_attr.max_srq_wr);
srq_attr.attr.max_sge = 1;
srq_attr.attr.srq_limit = 0;
sdev->srq = ib_create_srq(sdev->pd, &srq_attr);
if (IS_ERR(sdev->srq))
goto err_mr;
printk(KERN_DEBUG PFX "%s[%d] create SRQ #wr= %d max_allow=%d dev= %s\n",
__func__, __LINE__, srq_attr.attr.max_wr,
sdev->dev_attr.max_srq_wr, device->name);
if (!mellanox_ioc_guid)
mellanox_ioc_guid = be64_to_cpu(device->node_guid);
sdev->cm_id = ib_create_cm_id(device, srpt_cm_handler, sdev);
if (IS_ERR(sdev->cm_id))
goto err_srq;
/* print out target login information */
printk("Target login info: "
"id_ext=%016llx,ioc_guid=%016llx,pkey=ffff,service_id=%016llx\n",
(unsigned long long) mellanox_ioc_guid,
(unsigned long long) mellanox_ioc_guid,
(unsigned long long) mellanox_ioc_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
*/
if (ib_cm_listen(sdev->cm_id, cpu_to_be64(mellanox_ioc_guid), 0, NULL))
goto err_cm;
INIT_IB_EVENT_HANDLER(&sdev->event_handler, sdev->device,
srpt_event_handler);
if (ib_register_event_handler(&sdev->event_handler))
goto err_cm;
if (srpt_alloc_ioctx_ring(sdev))
goto err_event;
INIT_LIST_HEAD(&sdev->rch_list);
spin_lock_init(&sdev->spinlock);
for (i = 0; i < SRPT_SRQ_SIZE; ++i)
srpt_post_recv(sdev, sdev->ioctx_ring[i]);
list_add_tail(&sdev->list, &srpt_devices);
ib_set_client_data(device, &srpt_client, sdev);
return;
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);
err_class:
class_device_unregister(&sdev->class_dev);
free_dev:
kfree(sdev);
}
static void srpt_remove_one(struct ib_device *device)
{
struct srpt_device *sdev;
int i;
sdev = ib_get_client_data(device, &srpt_client);
if (!sdev)
return;
wait_for_completion(&sdev->scst_released);
ib_unregister_event_handler(&sdev->event_handler);
ib_destroy_cm_id(sdev->cm_id);
ib_destroy_srq(sdev->srq);
ib_dereg_mr(sdev->mr);
ib_dealloc_pd(sdev->pd);
class_device_unregister(&sdev->class_dev);
for (i = 0; i < SRPT_SRQ_SIZE; ++i)
srpt_free_ioctx(sdev, sdev->ioctx_ring[i]);
list_del(&sdev->list);
kfree(sdev);
}
static int __init srpt_init_module(void)
{
int ret;
INIT_LIST_HEAD(&srpt_devices);
ret = class_register(&srpt_class);
if (ret) {
printk(KERN_ERR PFX "couldn't register class ib_srpt\n");
return ret;
}
ret = ib_register_client(&srpt_client);
if (ret) {
printk(KERN_ERR PFX "couldn't register IB client\n");
goto mem_out;
}
ret = scst_register_target_template(&srpt_template);
if (ret < 0) {
printk(KERN_ERR PFX "couldn't register with scst\n");
ret = -ENODEV;
goto ib_out;
}
if (thread) {
spin_lock_init(&srpt_thread.thread_lock);
INIT_LIST_HEAD(&srpt_thread.thread_ioctx_list);
srpt_thread.thread = kthread_run(srpt_ioctx_thread,
NULL, "srpt_thread");
if (IS_ERR(srpt_thread.thread)) {
srpt_thread.thread = NULL;
thread = 0;
}
}
return 0;
ib_out:
ib_unregister_client(&srpt_client);
mem_out:
class_unregister(&srpt_class);
return ret;
}
static void __exit srpt_cleanup_module(void)
{
if (srpt_thread.thread)
kthread_stop(srpt_thread.thread);
scst_unregister_target_template(&srpt_template);
ib_unregister_client(&srpt_client);
class_unregister(&srpt_class);
}
module_init(srpt_init_module);
module_exit(srpt_cleanup_module);
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