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cf368713a3
android_kernel_xiaomi_sm8350/drivers/infiniband/ulp/srp/ib_srp.c
Roland Dreier cf368713a3 IB/srp: Use a fake scatterlist for non-SG SCSI commands 
Since the SCSI midlayer is moving towards entirely getting rid of
commands with use_sg == 0, we should treat this case as an exception.
Therefore, change the IB SRP initiator to create a fake scatterlist
for these commands with sg_init_one().  This simplifies the flow of
DMA mapping and unmapping, since SRP can just use dma_map_sg() and
dma_unmap_sg() unconditionally, rather than having to choose between
the dma_{map,unmap}_sg() and dma_{map,unmap}_single() variants.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
2006-03-24 15:47:26 -08:00

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/*
* Copyright (c) 2005 Cisco Systems. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* $Id: ib_srp.c 3932 2005-11-01 17:19:29Z roland $
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/string.h>
#include <linux/parser.h>
#include <linux/random.h>
#include <linux/jiffies.h>
#include <asm/atomic.h>
#include <scsi/scsi.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_dbg.h>
#include <scsi/srp.h>
#include <rdma/ib_cache.h>
#include "ib_srp.h"
#define DRV_NAME "ib_srp"
#define PFX DRV_NAME ": "
#define DRV_VERSION "0.2"
#define DRV_RELDATE "November 1, 2005"
MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("InfiniBand SCSI RDMA Protocol initiator "
"v" DRV_VERSION " (" DRV_RELDATE ")");
MODULE_LICENSE("Dual BSD/GPL");
static int topspin_workarounds = 1;
module_param(topspin_workarounds, int, 0444);
MODULE_PARM_DESC(topspin_workarounds,
"Enable workarounds for Topspin/Cisco SRP target bugs if != 0");
static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
static void srp_add_one(struct ib_device *device);
static void srp_remove_one(struct ib_device *device);
static void srp_completion(struct ib_cq *cq, void *target_ptr);
static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event);
static struct ib_client srp_client = {
.name = "srp",
.add = srp_add_one,
.remove = srp_remove_one
};
static inline struct srp_target_port *host_to_target(struct Scsi_Host *host)
{
return (struct srp_target_port *) host->hostdata;
}
static const char *srp_target_info(struct Scsi_Host *host)
{
return host_to_target(host)->target_name;
}
static struct srp_iu *srp_alloc_iu(struct srp_host *host, size_t size,
gfp_t gfp_mask,
enum dma_data_direction direction)
{
struct srp_iu *iu;
iu = kmalloc(sizeof *iu, gfp_mask);
if (!iu)
goto out;
iu->buf = kzalloc(size, gfp_mask);
if (!iu->buf)
goto out_free_iu;
iu->dma = dma_map_single(host->dev->dma_device, iu->buf, size, direction);
if (dma_mapping_error(iu->dma))
goto out_free_buf;
iu->size = size;
iu->direction = direction;
return iu;
out_free_buf:
kfree(iu->buf);
out_free_iu:
kfree(iu);
out:
return NULL;
}
static void srp_free_iu(struct srp_host *host, struct srp_iu *iu)
{
if (!iu)
return;
dma_unmap_single(host->dev->dma_device, iu->dma, iu->size, iu->direction);
kfree(iu->buf);
kfree(iu);
}
static void srp_qp_event(struct ib_event *event, void *context)
{
printk(KERN_ERR PFX "QP event %d\n", event->event);
}
static int srp_init_qp(struct srp_target_port *target,
struct ib_qp *qp)
{
struct ib_qp_attr *attr;
int ret;
attr = kmalloc(sizeof *attr, GFP_KERNEL);
if (!attr)
return -ENOMEM;
ret = ib_find_cached_pkey(target->srp_host->dev,
target->srp_host->port,
be16_to_cpu(target->path.pkey),
&attr->pkey_index);
if (ret)
goto out;
attr->qp_state = IB_QPS_INIT;
attr->qp_access_flags = (IB_ACCESS_REMOTE_READ |
IB_ACCESS_REMOTE_WRITE);
attr->port_num = target->srp_host->port;
ret = ib_modify_qp(qp, attr,
IB_QP_STATE |
IB_QP_PKEY_INDEX |
IB_QP_ACCESS_FLAGS |
IB_QP_PORT);
out:
kfree(attr);
return ret;
}
static int srp_create_target_ib(struct srp_target_port *target)
{
struct ib_qp_init_attr *init_attr;
int ret;
init_attr = kzalloc(sizeof *init_attr, GFP_KERNEL);
if (!init_attr)
return -ENOMEM;
target->cq = ib_create_cq(target->srp_host->dev, srp_completion,
NULL, target, SRP_CQ_SIZE);
if (IS_ERR(target->cq)) {
ret = PTR_ERR(target->cq);
goto out;
}
ib_req_notify_cq(target->cq, IB_CQ_NEXT_COMP);
init_attr->event_handler = srp_qp_event;
init_attr->cap.max_send_wr = SRP_SQ_SIZE;
init_attr->cap.max_recv_wr = SRP_RQ_SIZE;
init_attr->cap.max_recv_sge = 1;
init_attr->cap.max_send_sge = 1;
init_attr->sq_sig_type = IB_SIGNAL_ALL_WR;
init_attr->qp_type = IB_QPT_RC;
init_attr->send_cq = target->cq;
init_attr->recv_cq = target->cq;
target->qp = ib_create_qp(target->srp_host->pd, init_attr);
if (IS_ERR(target->qp)) {
ret = PTR_ERR(target->qp);
ib_destroy_cq(target->cq);
goto out;
}
ret = srp_init_qp(target, target->qp);
if (ret) {
ib_destroy_qp(target->qp);
ib_destroy_cq(target->cq);
goto out;
}
out:
kfree(init_attr);
return ret;
}
static void srp_free_target_ib(struct srp_target_port *target)
{
int i;
ib_destroy_qp(target->qp);
ib_destroy_cq(target->cq);
for (i = 0; i < SRP_RQ_SIZE; ++i)
srp_free_iu(target->srp_host, target->rx_ring[i]);
for (i = 0; i < SRP_SQ_SIZE + 1; ++i)
srp_free_iu(target->srp_host, target->tx_ring[i]);
}
static void srp_path_rec_completion(int status,
struct ib_sa_path_rec *pathrec,
void *target_ptr)
{
struct srp_target_port *target = target_ptr;
target->status = status;
if (status)
printk(KERN_ERR PFX "Got failed path rec status %d\n", status);
else
target->path = *pathrec;
complete(&target->done);
}
static int srp_lookup_path(struct srp_target_port *target)
{
target->path.numb_path = 1;
init_completion(&target->done);
target->path_query_id = ib_sa_path_rec_get(target->srp_host->dev,
target->srp_host->port,
&target->path,
IB_SA_PATH_REC_DGID |
IB_SA_PATH_REC_SGID |
IB_SA_PATH_REC_NUMB_PATH |
IB_SA_PATH_REC_PKEY,
SRP_PATH_REC_TIMEOUT_MS,
GFP_KERNEL,
srp_path_rec_completion,
target, &target->path_query);
if (target->path_query_id < 0)
return target->path_query_id;
wait_for_completion(&target->done);
if (target->status < 0)
printk(KERN_WARNING PFX "Path record query failed\n");
return target->status;
}
static int srp_send_req(struct srp_target_port *target)
{
struct {
struct ib_cm_req_param param;
struct srp_login_req priv;
} *req = NULL;
int status;
req = kzalloc(sizeof *req, GFP_KERNEL);
if (!req)
return -ENOMEM;
req->param.primary_path = &target->path;
req->param.alternate_path = NULL;
req->param.service_id = target->service_id;
req->param.qp_num = target->qp->qp_num;
req->param.qp_type = target->qp->qp_type;
req->param.private_data = &req->priv;
req->param.private_data_len = sizeof req->priv;
req->param.flow_control = 1;
get_random_bytes(&req->param.starting_psn, 4);
req->param.starting_psn &= 0xffffff;
/*
* Pick some arbitrary defaults here; we could make these
* module parameters if anyone cared about setting them.
*/
req->param.responder_resources = 4;
req->param.remote_cm_response_timeout = 20;
req->param.local_cm_response_timeout = 20;
req->param.retry_count = 7;
req->param.rnr_retry_count = 7;
req->param.max_cm_retries = 15;
req->priv.opcode = SRP_LOGIN_REQ;
req->priv.tag = 0;
req->priv.req_it_iu_len = cpu_to_be32(SRP_MAX_IU_LEN);
req->priv.req_buf_fmt = cpu_to_be16(SRP_BUF_FORMAT_DIRECT |
SRP_BUF_FORMAT_INDIRECT);
memcpy(req->priv.initiator_port_id, target->srp_host->initiator_port_id, 16);
/*
* Topspin/Cisco SRP targets will reject our login unless we
* zero out the first 8 bytes of our initiator port ID. The
* second 8 bytes must be our local node GUID, but we always
* use that anyway.
*/
if (topspin_workarounds && !memcmp(&target->ioc_guid, topspin_oui, 3)) {
printk(KERN_DEBUG PFX "Topspin/Cisco initiator port ID workaround "
"activated for target GUID %016llx\n",
(unsigned long long) be64_to_cpu(target->ioc_guid));
memset(req->priv.initiator_port_id, 0, 8);
}
memcpy(req->priv.target_port_id, &target->id_ext, 8);
memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
status = ib_send_cm_req(target->cm_id, &req->param);
kfree(req);
return status;
}
static void srp_disconnect_target(struct srp_target_port *target)
{
/* XXX should send SRP_I_LOGOUT request */
init_completion(&target->done);
ib_send_cm_dreq(target->cm_id, NULL, 0);
wait_for_completion(&target->done);
}
static void srp_remove_work(void *target_ptr)
{
struct srp_target_port *target = target_ptr;
spin_lock_irq(target->scsi_host->host_lock);
if (target->state != SRP_TARGET_DEAD) {
spin_unlock_irq(target->scsi_host->host_lock);
scsi_host_put(target->scsi_host);
return;
}
target->state = SRP_TARGET_REMOVED;
spin_unlock_irq(target->scsi_host->host_lock);
mutex_lock(&target->srp_host->target_mutex);
list_del(&target->list);
mutex_unlock(&target->srp_host->target_mutex);
scsi_remove_host(target->scsi_host);
ib_destroy_cm_id(target->cm_id);
srp_free_target_ib(target);
scsi_host_put(target->scsi_host);
/* And another put to really free the target port... */
scsi_host_put(target->scsi_host);
}
static int srp_connect_target(struct srp_target_port *target)
{
int ret;
ret = srp_lookup_path(target);
if (ret)
return ret;
while (1) {
init_completion(&target->done);
ret = srp_send_req(target);
if (ret)
return ret;
wait_for_completion(&target->done);
/*
* The CM event handling code will set status to
* SRP_PORT_REDIRECT if we get a port redirect REJ
* back, or SRP_DLID_REDIRECT if we get a lid/qp
* redirect REJ back.
*/
switch (target->status) {
case 0:
return 0;
case SRP_PORT_REDIRECT:
ret = srp_lookup_path(target);
if (ret)
return ret;
break;
case SRP_DLID_REDIRECT:
break;
default:
return target->status;
}
}
}
static int srp_reconnect_target(struct srp_target_port *target)
{
struct ib_cm_id *new_cm_id;
struct ib_qp_attr qp_attr;
struct srp_request *req;
struct ib_wc wc;
int ret;
int i;
spin_lock_irq(target->scsi_host->host_lock);
if (target->state != SRP_TARGET_LIVE) {
spin_unlock_irq(target->scsi_host->host_lock);
return -EAGAIN;
}
target->state = SRP_TARGET_CONNECTING;
spin_unlock_irq(target->scsi_host->host_lock);
srp_disconnect_target(target);
/*
* Now get a new local CM ID so that we avoid confusing the
* target in case things are really fouled up.
*/
new_cm_id = ib_create_cm_id(target->srp_host->dev,
srp_cm_handler, target);
if (IS_ERR(new_cm_id)) {
ret = PTR_ERR(new_cm_id);
goto err;
}
ib_destroy_cm_id(target->cm_id);
target->cm_id = new_cm_id;
qp_attr.qp_state = IB_QPS_RESET;
ret = ib_modify_qp(target->qp, &qp_attr, IB_QP_STATE);
if (ret)
goto err;
ret = srp_init_qp(target, target->qp);
if (ret)
goto err;
while (ib_poll_cq(target->cq, 1, &wc) > 0)
; /* nothing */
list_for_each_entry(req, &target->req_queue, list) {
req->scmnd->result = DID_RESET << 16;
req->scmnd->scsi_done(req->scmnd);
}
target->rx_head = 0;
target->tx_head = 0;
target->tx_tail = 0;
target->req_head = 0;
for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
target->req_ring[i].next = i + 1;
target->req_ring[SRP_SQ_SIZE - 1].next = -1;
INIT_LIST_HEAD(&target->req_queue);
ret = srp_connect_target(target);
if (ret)
goto err;
spin_lock_irq(target->scsi_host->host_lock);
if (target->state == SRP_TARGET_CONNECTING) {
ret = 0;
target->state = SRP_TARGET_LIVE;
} else
ret = -EAGAIN;
spin_unlock_irq(target->scsi_host->host_lock);
return ret;
err:
printk(KERN_ERR PFX "reconnect failed (%d), removing target port.\n", ret);
/*
* We couldn't reconnect, so kill our target port off.
* However, we have to defer the real removal because we might
* be in the context of the SCSI error handler now, which
* would deadlock if we call scsi_remove_host().
*/
spin_lock_irq(target->scsi_host->host_lock);
if (target->state == SRP_TARGET_CONNECTING) {
target->state = SRP_TARGET_DEAD;
INIT_WORK(&target->work, srp_remove_work, target);
schedule_work(&target->work);
}
spin_unlock_irq(target->scsi_host->host_lock);
return ret;
}
static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
struct srp_request *req)
{
struct scatterlist *scat;
struct srp_cmd *cmd = req->cmd->buf;
int len, nents, count;
int i;
u8 fmt;
if (!scmnd->request_buffer || scmnd->sc_data_direction == DMA_NONE)
return sizeof (struct srp_cmd);
if (scmnd->sc_data_direction != DMA_FROM_DEVICE &&
scmnd->sc_data_direction != DMA_TO_DEVICE) {
printk(KERN_WARNING PFX "Unhandled data direction %d\n",
scmnd->sc_data_direction);
return -EINVAL;
}
/*
* This handling of non-SG commands can be killed when the
* SCSI midlayer no longer generates non-SG commands.
*/
if (likely(scmnd->use_sg)) {
nents = scmnd->use_sg;
scat = scmnd->request_buffer;
} else {
nents = 1;
scat = &req->fake_sg;
sg_init_one(scat, scmnd->request_buffer, scmnd->request_bufflen);
}
count = dma_map_sg(target->srp_host->dev->dma_device, scat, nents,
scmnd->sc_data_direction);
if (count == 1) {
struct srp_direct_buf *buf = (void *) cmd->add_data;
fmt = SRP_DATA_DESC_DIRECT;
buf->va = cpu_to_be64(sg_dma_address(scat));
buf->key = cpu_to_be32(target->srp_host->mr->rkey);
buf->len = cpu_to_be32(sg_dma_len(scat));
len = sizeof (struct srp_cmd) +
sizeof (struct srp_direct_buf);
} else {
struct srp_indirect_buf *buf = (void *) cmd->add_data;
u32 datalen = 0;
fmt = SRP_DATA_DESC_INDIRECT;
if (scmnd->sc_data_direction == DMA_TO_DEVICE)
cmd->data_out_desc_cnt = count;
else
cmd->data_in_desc_cnt = count;
buf->table_desc.va = cpu_to_be64(req->cmd->dma +
sizeof *cmd +
sizeof *buf);
buf->table_desc.key =
cpu_to_be32(target->srp_host->mr->rkey);
buf->table_desc.len =
cpu_to_be32(count * sizeof (struct srp_direct_buf));
for (i = 0; i < count; ++i) {
buf->desc_list[i].va = cpu_to_be64(sg_dma_address(&scat[i]));
buf->desc_list[i].key =
cpu_to_be32(target->srp_host->mr->rkey);
buf->desc_list[i].len = cpu_to_be32(sg_dma_len(&scat[i]));
datalen += sg_dma_len(&scat[i]);
}
buf->len = cpu_to_be32(datalen);
len = sizeof (struct srp_cmd) +
sizeof (struct srp_indirect_buf) +
count * sizeof (struct srp_direct_buf);
}
if (scmnd->sc_data_direction == DMA_TO_DEVICE)
cmd->buf_fmt = fmt << 4;
else
cmd->buf_fmt = fmt;
return len;
}
static void srp_unmap_data(struct scsi_cmnd *scmnd,
struct srp_target_port *target,
struct srp_request *req)
{
struct scatterlist *scat;
int nents;
if (!scmnd->request_buffer ||
(scmnd->sc_data_direction != DMA_TO_DEVICE &&
scmnd->sc_data_direction != DMA_FROM_DEVICE))
return;
/*
* This handling of non-SG commands can be killed when the
* SCSI midlayer no longer generates non-SG commands.
*/
if (likely(scmnd->use_sg)) {
nents = scmnd->use_sg;
scat = (struct scatterlist *) scmnd->request_buffer;
} else {
nents = 1;
scat = (struct scatterlist *) scmnd->request_buffer;
}
dma_unmap_sg(target->srp_host->dev->dma_device, scat, nents,
scmnd->sc_data_direction);
}
static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
{
struct srp_request *req;
struct scsi_cmnd *scmnd;
unsigned long flags;
s32 delta;
delta = (s32) be32_to_cpu(rsp->req_lim_delta);
spin_lock_irqsave(target->scsi_host->host_lock, flags);
target->req_lim += delta;
req = &target->req_ring[rsp->tag & ~SRP_TAG_TSK_MGMT];
if (unlikely(rsp->tag & SRP_TAG_TSK_MGMT)) {
if (be32_to_cpu(rsp->resp_data_len) < 4)
req->tsk_status = -1;
else
req->tsk_status = rsp->data[3];
complete(&req->done);
} else {
scmnd = req->scmnd;
if (!scmnd)
printk(KERN_ERR "Null scmnd for RSP w/tag %016llx\n",
(unsigned long long) rsp->tag);
scmnd->result = rsp->status;
if (rsp->flags & SRP_RSP_FLAG_SNSVALID) {
memcpy(scmnd->sense_buffer, rsp->data +
be32_to_cpu(rsp->resp_data_len),
min_t(int, be32_to_cpu(rsp->sense_data_len),
SCSI_SENSE_BUFFERSIZE));
}
if (rsp->flags & (SRP_RSP_FLAG_DOOVER | SRP_RSP_FLAG_DOUNDER))
scmnd->resid = be32_to_cpu(rsp->data_out_res_cnt);
else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
scmnd->resid = be32_to_cpu(rsp->data_in_res_cnt);
srp_unmap_data(scmnd, target, req);
if (!req->tsk_mgmt) {
req->scmnd = NULL;
scmnd->host_scribble = (void *) -1L;
scmnd->scsi_done(scmnd);
list_del(&req->list);
req->next = target->req_head;
target->req_head = rsp->tag & ~SRP_TAG_TSK_MGMT;
} else
req->cmd_done = 1;
}
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
}
static void srp_reconnect_work(void *target_ptr)
{
struct srp_target_port *target = target_ptr;
srp_reconnect_target(target);
}
static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
{
struct srp_iu *iu;
u8 opcode;
iu = target->rx_ring[wc->wr_id & ~SRP_OP_RECV];
dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
target->max_ti_iu_len, DMA_FROM_DEVICE);
opcode = *(u8 *) iu->buf;
if (0) {
int i;
printk(KERN_ERR PFX "recv completion, opcode 0x%02x\n", opcode);
for (i = 0; i < wc->byte_len; ++i) {
if (i % 8 == 0)
printk(KERN_ERR " [%02x] ", i);
printk(" %02x", ((u8 *) iu->buf)[i]);
if ((i + 1) % 8 == 0)
printk("\n");
}
if (wc->byte_len % 8)
printk("\n");
}
switch (opcode) {
case SRP_RSP:
srp_process_rsp(target, iu->buf);
break;
case SRP_T_LOGOUT:
/* XXX Handle target logout */
printk(KERN_WARNING PFX "Got target logout request\n");
break;
default:
printk(KERN_WARNING PFX "Unhandled SRP opcode 0x%02x\n", opcode);
break;
}
dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
target->max_ti_iu_len, DMA_FROM_DEVICE);
}
static void srp_completion(struct ib_cq *cq, void *target_ptr)
{
struct srp_target_port *target = target_ptr;
struct ib_wc wc;
unsigned long flags;
ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
while (ib_poll_cq(cq, 1, &wc) > 0) {
if (wc.status) {
printk(KERN_ERR PFX "failed %s status %d\n",
wc.wr_id & SRP_OP_RECV ? "receive" : "send",
wc.status);
spin_lock_irqsave(target->scsi_host->host_lock, flags);
if (target->state == SRP_TARGET_LIVE)
schedule_work(&target->work);
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
break;
}
if (wc.wr_id & SRP_OP_RECV)
srp_handle_recv(target, &wc);
else
++target->tx_tail;
}
}
static int __srp_post_recv(struct srp_target_port *target)
{
struct srp_iu *iu;
struct ib_sge list;
struct ib_recv_wr wr, *bad_wr;
unsigned int next;
int ret;
next = target->rx_head & (SRP_RQ_SIZE - 1);
wr.wr_id = next | SRP_OP_RECV;
iu = target->rx_ring[next];
list.addr = iu->dma;
list.length = iu->size;
list.lkey = target->srp_host->mr->lkey;
wr.next = NULL;
wr.sg_list = &list;
wr.num_sge = 1;
ret = ib_post_recv(target->qp, &wr, &bad_wr);
if (!ret)
++target->rx_head;
return ret;
}
static int srp_post_recv(struct srp_target_port *target)
{
unsigned long flags;
int ret;
spin_lock_irqsave(target->scsi_host->host_lock, flags);
ret = __srp_post_recv(target);
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
return ret;
}
/*
* Must be called with target->scsi_host->host_lock held to protect
* req_lim and tx_head. Lock cannot be dropped between call here and
* call to __srp_post_send().
*/
static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target)
{
if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
return NULL;
if (unlikely(target->req_lim < 1)) {
if (printk_ratelimit())
printk(KERN_DEBUG PFX "Target has req_lim %d\n",
target->req_lim);
return NULL;
}
return target->tx_ring[target->tx_head & SRP_SQ_SIZE];
}
/*
* Must be called with target->scsi_host->host_lock held to protect
* req_lim and tx_head.
*/
static int __srp_post_send(struct srp_target_port *target,
struct srp_iu *iu, int len)
{
struct ib_sge list;
struct ib_send_wr wr, *bad_wr;
int ret = 0;
list.addr = iu->dma;
list.length = len;
list.lkey = target->srp_host->mr->lkey;
wr.next = NULL;
wr.wr_id = target->tx_head & SRP_SQ_SIZE;
wr.sg_list = &list;
wr.num_sge = 1;
wr.opcode = IB_WR_SEND;
wr.send_flags = IB_SEND_SIGNALED;
ret = ib_post_send(target->qp, &wr, &bad_wr);
if (!ret) {
++target->tx_head;
--target->req_lim;
}
return ret;
}
static int srp_queuecommand(struct scsi_cmnd *scmnd,
void (*done)(struct scsi_cmnd *))
{
struct srp_target_port *target = host_to_target(scmnd->device->host);
struct srp_request *req;
struct srp_iu *iu;
struct srp_cmd *cmd;
long req_index;
int len;
if (target->state == SRP_TARGET_CONNECTING)
goto err;
if (target->state == SRP_TARGET_DEAD ||
target->state == SRP_TARGET_REMOVED) {
scmnd->result = DID_BAD_TARGET << 16;
done(scmnd);
return 0;
}
iu = __srp_get_tx_iu(target);
if (!iu)
goto err;
dma_sync_single_for_cpu(target->srp_host->dev->dma_device, iu->dma,
SRP_MAX_IU_LEN, DMA_TO_DEVICE);
req_index = target->req_head;
scmnd->scsi_done = done;
scmnd->result = 0;
scmnd->host_scribble = (void *) req_index;
cmd = iu->buf;
memset(cmd, 0, sizeof *cmd);
cmd->opcode = SRP_CMD;
cmd->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
cmd->tag = req_index;
memcpy(cmd->cdb, scmnd->cmnd, scmnd->cmd_len);
req = &target->req_ring[req_index];
req->scmnd = scmnd;
req->cmd = iu;
req->cmd_done = 0;
req->tsk_mgmt = NULL;
len = srp_map_data(scmnd, target, req);
if (len < 0) {
printk(KERN_ERR PFX "Failed to map data\n");
goto err;
}
if (__srp_post_recv(target)) {
printk(KERN_ERR PFX "Recv failed\n");
goto err_unmap;
}
dma_sync_single_for_device(target->srp_host->dev->dma_device, iu->dma,
SRP_MAX_IU_LEN, DMA_TO_DEVICE);
if (__srp_post_send(target, iu, len)) {
printk(KERN_ERR PFX "Send failed\n");
goto err_unmap;
}
target->req_head = req->next;
list_add_tail(&req->list, &target->req_queue);
return 0;
err_unmap:
srp_unmap_data(scmnd, target, req);
err:
return SCSI_MLQUEUE_HOST_BUSY;
}
static int srp_alloc_iu_bufs(struct srp_target_port *target)
{
int i;
for (i = 0; i < SRP_RQ_SIZE; ++i) {
target->rx_ring[i] = srp_alloc_iu(target->srp_host,
target->max_ti_iu_len,
GFP_KERNEL, DMA_FROM_DEVICE);
if (!target->rx_ring[i])
goto err;
}
for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
target->tx_ring[i] = srp_alloc_iu(target->srp_host,
SRP_MAX_IU_LEN,
GFP_KERNEL, DMA_TO_DEVICE);
if (!target->tx_ring[i])
goto err;
}
return 0;
err:
for (i = 0; i < SRP_RQ_SIZE; ++i) {
srp_free_iu(target->srp_host, target->rx_ring[i]);
target->rx_ring[i] = NULL;
}
for (i = 0; i < SRP_SQ_SIZE + 1; ++i) {
srp_free_iu(target->srp_host, target->tx_ring[i]);
target->tx_ring[i] = NULL;
}
return -ENOMEM;
}
static void srp_cm_rej_handler(struct ib_cm_id *cm_id,
struct ib_cm_event *event,
struct srp_target_port *target)
{
struct ib_class_port_info *cpi;
int opcode;
switch (event->param.rej_rcvd.reason) {
case IB_CM_REJ_PORT_CM_REDIRECT:
cpi = event->param.rej_rcvd.ari;
target->path.dlid = cpi->redirect_lid;
target->path.pkey = cpi->redirect_pkey;
cm_id->remote_cm_qpn = be32_to_cpu(cpi->redirect_qp) & 0x00ffffff;
memcpy(target->path.dgid.raw, cpi->redirect_gid, 16);
target->status = target->path.dlid ?
SRP_DLID_REDIRECT : SRP_PORT_REDIRECT;
break;
case IB_CM_REJ_PORT_REDIRECT:
if (topspin_workarounds &&
!memcmp(&target->ioc_guid, topspin_oui, 3)) {
/*
* Topspin/Cisco SRP gateways incorrectly send
* reject reason code 25 when they mean 24
* (port redirect).
*/
memcpy(target->path.dgid.raw,
event->param.rej_rcvd.ari, 16);
printk(KERN_DEBUG PFX "Topspin/Cisco redirect to target port GID %016llx%016llx\n",
(unsigned long long) be64_to_cpu(target->path.dgid.global.subnet_prefix),
(unsigned long long) be64_to_cpu(target->path.dgid.global.interface_id));
target->status = SRP_PORT_REDIRECT;
} else {
printk(KERN_WARNING " REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
target->status = -ECONNRESET;
}
break;
case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
printk(KERN_WARNING " REJ reason: IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID\n");
target->status = -ECONNRESET;
break;
case IB_CM_REJ_CONSUMER_DEFINED:
opcode = *(u8 *) event->private_data;
if (opcode == SRP_LOGIN_REJ) {
struct srp_login_rej *rej = event->private_data;
u32 reason = be32_to_cpu(rej->reason);
if (reason == SRP_LOGIN_REJ_REQ_IT_IU_LENGTH_TOO_LARGE)
printk(KERN_WARNING PFX
"SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
else
printk(KERN_WARNING PFX
"SRP LOGIN REJECTED, reason 0x%08x\n", reason);
} else
printk(KERN_WARNING " REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
" opcode 0x%02x\n", opcode);
target->status = -ECONNRESET;
break;
default:
printk(KERN_WARNING " REJ reason 0x%x\n",
event->param.rej_rcvd.reason);
target->status = -ECONNRESET;
}
}
static int srp_cm_handler(struct ib_cm_id *cm_id, struct ib_cm_event *event)
{
struct srp_target_port *target = cm_id->context;
struct ib_qp_attr *qp_attr = NULL;
int attr_mask = 0;
int comp = 0;
int opcode = 0;
switch (event->event) {
case IB_CM_REQ_ERROR:
printk(KERN_DEBUG PFX "Sending CM REQ failed\n");
comp = 1;
target->status = -ECONNRESET;
break;
case IB_CM_REP_RECEIVED:
comp = 1;
opcode = *(u8 *) event->private_data;
if (opcode == SRP_LOGIN_RSP) {
struct srp_login_rsp *rsp = event->private_data;
target->max_ti_iu_len = be32_to_cpu(rsp->max_ti_iu_len);
target->req_lim = be32_to_cpu(rsp->req_lim_delta);
target->scsi_host->can_queue = min(target->req_lim,
target->scsi_host->can_queue);
} else {
printk(KERN_WARNING PFX "Unhandled RSP opcode %#x\n", opcode);
target->status = -ECONNRESET;
break;
}
target->status = srp_alloc_iu_bufs(target);
if (target->status)
break;
qp_attr = kmalloc(sizeof *qp_attr, GFP_KERNEL);
if (!qp_attr) {
target->status = -ENOMEM;
break;
}
qp_attr->qp_state = IB_QPS_RTR;
target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
if (target->status)
break;
target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
if (target->status)
break;
target->status = srp_post_recv(target);
if (target->status)
break;
qp_attr->qp_state = IB_QPS_RTS;
target->status = ib_cm_init_qp_attr(cm_id, qp_attr, &attr_mask);
if (target->status)
break;
target->status = ib_modify_qp(target->qp, qp_attr, attr_mask);
if (target->status)
break;
target->status = ib_send_cm_rtu(cm_id, NULL, 0);
if (target->status)
break;
break;
case IB_CM_REJ_RECEIVED:
printk(KERN_DEBUG PFX "REJ received\n");
comp = 1;
srp_cm_rej_handler(cm_id, event, target);
break;
case IB_CM_MRA_RECEIVED:
printk(KERN_ERR PFX "MRA received\n");
break;
case IB_CM_DREP_RECEIVED:
break;
case IB_CM_TIMEWAIT_EXIT:
printk(KERN_ERR PFX "connection closed\n");
comp = 1;
target->status = 0;
break;
default:
printk(KERN_WARNING PFX "Unhandled CM event %d\n", event->event);
break;
}
if (comp)
complete(&target->done);
kfree(qp_attr);
return 0;
}
static int srp_send_tsk_mgmt(struct scsi_cmnd *scmnd, u8 func)
{
struct srp_target_port *target = host_to_target(scmnd->device->host);
struct srp_request *req;
struct srp_iu *iu;
struct srp_tsk_mgmt *tsk_mgmt;
int req_index;
int ret = FAILED;
spin_lock_irq(target->scsi_host->host_lock);
if (target->state == SRP_TARGET_DEAD ||
target->state == SRP_TARGET_REMOVED) {
scmnd->result = DID_BAD_TARGET << 16;
goto out;
}
if (scmnd->host_scribble == (void *) -1L)
goto out;
req_index = (long) scmnd->host_scribble;
printk(KERN_ERR "Abort for req_index %d\n", req_index);
req = &target->req_ring[req_index];
init_completion(&req->done);
iu = __srp_get_tx_iu(target);
if (!iu)
goto out;
tsk_mgmt = iu->buf;
memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
tsk_mgmt->opcode = SRP_TSK_MGMT;
tsk_mgmt->lun = cpu_to_be64((u64) scmnd->device->lun << 48);
tsk_mgmt->tag = req_index | SRP_TAG_TSK_MGMT;
tsk_mgmt->tsk_mgmt_func = func;
tsk_mgmt->task_tag = req_index;
if (__srp_post_send(target, iu, sizeof *tsk_mgmt))
goto out;
req->tsk_mgmt = iu;
spin_unlock_irq(target->scsi_host->host_lock);
if (!wait_for_completion_timeout(&req->done,
msecs_to_jiffies(SRP_ABORT_TIMEOUT_MS)))
return FAILED;
spin_lock_irq(target->scsi_host->host_lock);
if (req->cmd_done) {
list_del(&req->list);
req->next = target->req_head;
target->req_head = req_index;
scmnd->scsi_done(scmnd);
} else if (!req->tsk_status) {
scmnd->result = DID_ABORT << 16;
ret = SUCCESS;
}
out:
spin_unlock_irq(target->scsi_host->host_lock);
return ret;
}
static int srp_abort(struct scsi_cmnd *scmnd)
{
printk(KERN_ERR "SRP abort called\n");
return srp_send_tsk_mgmt(scmnd, SRP_TSK_ABORT_TASK);
}
static int srp_reset_device(struct scsi_cmnd *scmnd)
{
printk(KERN_ERR "SRP reset_device called\n");
return srp_send_tsk_mgmt(scmnd, SRP_TSK_LUN_RESET);
}
static int srp_reset_host(struct scsi_cmnd *scmnd)
{
struct srp_target_port *target = host_to_target(scmnd->device->host);
int ret = FAILED;
printk(KERN_ERR PFX "SRP reset_host called\n");
if (!srp_reconnect_target(target))
ret = SUCCESS;
return ret;
}
static ssize_t show_id_ext(struct class_device *cdev, char *buf)
{
struct srp_target_port *target = host_to_target(class_to_shost(cdev));
if (target->state == SRP_TARGET_DEAD ||
target->state == SRP_TARGET_REMOVED)
return -ENODEV;
return sprintf(buf, "0x%016llx\n",
(unsigned long long) be64_to_cpu(target->id_ext));
}
static ssize_t show_ioc_guid(struct class_device *cdev, char *buf)
{
struct srp_target_port *target = host_to_target(class_to_shost(cdev));
if (target->state == SRP_TARGET_DEAD ||
target->state == SRP_TARGET_REMOVED)
return -ENODEV;
return sprintf(buf, "0x%016llx\n",
(unsigned long long) be64_to_cpu(target->ioc_guid));
}
static ssize_t show_service_id(struct class_device *cdev, char *buf)
{
struct srp_target_port *target = host_to_target(class_to_shost(cdev));
if (target->state == SRP_TARGET_DEAD ||
target->state == SRP_TARGET_REMOVED)
return -ENODEV;
return sprintf(buf, "0x%016llx\n",
(unsigned long long) be64_to_cpu(target->service_id));
}
static ssize_t show_pkey(struct class_device *cdev, char *buf)
{
struct srp_target_port *target = host_to_target(class_to_shost(cdev));
if (target->state == SRP_TARGET_DEAD ||
target->state == SRP_TARGET_REMOVED)
return -ENODEV;
return sprintf(buf, "0x%04x\n", be16_to_cpu(target->path.pkey));
}
static ssize_t show_dgid(struct class_device *cdev, char *buf)
{
struct srp_target_port *target = host_to_target(class_to_shost(cdev));
if (target->state == SRP_TARGET_DEAD ||
target->state == SRP_TARGET_REMOVED)
return -ENODEV;
return sprintf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
be16_to_cpu(((__be16 *) target->path.dgid.raw)[0]),
be16_to_cpu(((__be16 *) target->path.dgid.raw)[1]),
be16_to_cpu(((__be16 *) target->path.dgid.raw)[2]),
be16_to_cpu(((__be16 *) target->path.dgid.raw)[3]),
be16_to_cpu(((__be16 *) target->path.dgid.raw)[4]),
be16_to_cpu(((__be16 *) target->path.dgid.raw)[5]),
be16_to_cpu(((__be16 *) target->path.dgid.raw)[6]),
be16_to_cpu(((__be16 *) target->path.dgid.raw)[7]));
}
static CLASS_DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
static CLASS_DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
static CLASS_DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
static CLASS_DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
static CLASS_DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
static struct class_device_attribute *srp_host_attrs[] = {
&class_device_attr_id_ext,
&class_device_attr_ioc_guid,
&class_device_attr_service_id,
&class_device_attr_pkey,
&class_device_attr_dgid,
NULL
};
static struct scsi_host_template srp_template = {
.module = THIS_MODULE,
.name = DRV_NAME,
.info = srp_target_info,
.queuecommand = srp_queuecommand,
.eh_abort_handler = srp_abort,
.eh_device_reset_handler = srp_reset_device,
.eh_host_reset_handler = srp_reset_host,
.can_queue = SRP_SQ_SIZE,
.this_id = -1,
.sg_tablesize = SRP_MAX_INDIRECT,
.cmd_per_lun = SRP_SQ_SIZE,
.use_clustering = ENABLE_CLUSTERING,
.shost_attrs = srp_host_attrs
};
static int srp_add_target(struct srp_host *host, struct srp_target_port *target)
{
sprintf(target->target_name, "SRP.T10:%016llX",
(unsigned long long) be64_to_cpu(target->id_ext));
if (scsi_add_host(target->scsi_host, host->dev->dma_device))
return -ENODEV;
mutex_lock(&host->target_mutex);
list_add_tail(&target->list, &host->target_list);
mutex_unlock(&host->target_mutex);
target->state = SRP_TARGET_LIVE;
/* XXX: are we supposed to have a definition of SCAN_WILD_CARD ?? */
scsi_scan_target(&target->scsi_host->shost_gendev,
0, target->scsi_id, ~0, 0);
return 0;
}
static void srp_release_class_dev(struct class_device *class_dev)
{
struct srp_host *host =
container_of(class_dev, struct srp_host, class_dev);
complete(&host->released);
}
static struct class srp_class = {
.name = "infiniband_srp",
.release = srp_release_class_dev
};
/*
* Target ports are added by writing
*
* id_ext=<SRP ID ext>,ioc_guid=<SRP IOC GUID>,dgid=<dest GID>,
* pkey=<P_Key>,service_id=<service ID>
*
* to the add_target sysfs attribute.
*/
enum {
SRP_OPT_ERR = 0,
SRP_OPT_ID_EXT = 1 << 0,
SRP_OPT_IOC_GUID = 1 << 1,
SRP_OPT_DGID = 1 << 2,
SRP_OPT_PKEY = 1 << 3,
SRP_OPT_SERVICE_ID = 1 << 4,
SRP_OPT_MAX_SECT = 1 << 5,
SRP_OPT_ALL = (SRP_OPT_ID_EXT |
SRP_OPT_IOC_GUID |
SRP_OPT_DGID |
SRP_OPT_PKEY |
SRP_OPT_SERVICE_ID),
};
static match_table_t srp_opt_tokens = {
{ SRP_OPT_ID_EXT, "id_ext=%s" },
{ SRP_OPT_IOC_GUID, "ioc_guid=%s" },
{ SRP_OPT_DGID, "dgid=%s" },
{ SRP_OPT_PKEY, "pkey=%x" },
{ SRP_OPT_SERVICE_ID, "service_id=%s" },
{ SRP_OPT_MAX_SECT, "max_sect=%d" },
{ SRP_OPT_ERR, NULL }
};
static int srp_parse_options(const char *buf, struct srp_target_port *target)
{
char *options, *sep_opt;
char *p;
char dgid[3];
substring_t args[MAX_OPT_ARGS];
int opt_mask = 0;
int token;
int ret = -EINVAL;
int i;
options = kstrdup(buf, GFP_KERNEL);
if (!options)
return -ENOMEM;
sep_opt = options;
while ((p = strsep(&sep_opt, ",")) != NULL) {
if (!*p)
continue;
token = match_token(p, srp_opt_tokens, args);
opt_mask |= token;
switch (token) {
case SRP_OPT_ID_EXT:
p = match_strdup(args);
target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
kfree(p);
break;
case SRP_OPT_IOC_GUID:
p = match_strdup(args);
target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
kfree(p);
break;
case SRP_OPT_DGID:
p = match_strdup(args);
if (strlen(p) != 32) {
printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
goto out;
}
for (i = 0; i < 16; ++i) {
strlcpy(dgid, p + i * 2, 3);
target->path.dgid.raw[i] = simple_strtoul(dgid, NULL, 16);
}
kfree(p);
break;
case SRP_OPT_PKEY:
if (match_hex(args, &token)) {
printk(KERN_WARNING PFX "bad P_Key parameter '%s'\n", p);
goto out;
}
target->path.pkey = cpu_to_be16(token);
break;
case SRP_OPT_SERVICE_ID:
p = match_strdup(args);
target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
kfree(p);
break;
case SRP_OPT_MAX_SECT:
if (match_int(args, &token)) {
printk(KERN_WARNING PFX "bad max sect parameter '%s'\n", p);
goto out;
}
target->scsi_host->max_sectors = token;
break;
default:
printk(KERN_WARNING PFX "unknown parameter or missing value "
"'%s' in target creation request\n", p);
goto out;
}
}
if ((opt_mask & SRP_OPT_ALL) == SRP_OPT_ALL)
ret = 0;
else
for (i = 0; i < ARRAY_SIZE(srp_opt_tokens); ++i)
if ((srp_opt_tokens[i].token & SRP_OPT_ALL) &&
!(srp_opt_tokens[i].token & opt_mask))
printk(KERN_WARNING PFX "target creation request is "
"missing parameter '%s'\n",
srp_opt_tokens[i].pattern);
out:
kfree(options);
return ret;
}
static ssize_t srp_create_target(struct class_device *class_dev,
const char *buf, size_t count)
{
struct srp_host *host =
container_of(class_dev, struct srp_host, class_dev);
struct Scsi_Host *target_host;
struct srp_target_port *target;
int ret;
int i;
target_host = scsi_host_alloc(&srp_template,
sizeof (struct srp_target_port));
if (!target_host)
return -ENOMEM;
target_host->max_lun = SRP_MAX_LUN;
target = host_to_target(target_host);
memset(target, 0, sizeof *target);
target->scsi_host = target_host;
target->srp_host = host;
INIT_WORK(&target->work, srp_reconnect_work, target);
for (i = 0; i < SRP_SQ_SIZE - 1; ++i)
target->req_ring[i].next = i + 1;
target->req_ring[SRP_SQ_SIZE - 1].next = -1;
INIT_LIST_HEAD(&target->req_queue);
ret = srp_parse_options(buf, target);
if (ret)
goto err;
ib_get_cached_gid(host->dev, host->port, 0, &target->path.sgid);
printk(KERN_DEBUG PFX "new target: id_ext %016llx ioc_guid %016llx pkey %04x "
"service_id %016llx dgid %04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
(unsigned long long) be64_to_cpu(target->id_ext),
(unsigned long long) be64_to_cpu(target->ioc_guid),
be16_to_cpu(target->path.pkey),
(unsigned long long) be64_to_cpu(target->service_id),
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[0]),
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[2]),
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[4]),
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[6]),
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[8]),
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[10]),
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[12]),
(int) be16_to_cpu(*(__be16 *) &target->path.dgid.raw[14]));
ret = srp_create_target_ib(target);
if (ret)
goto err;
target->cm_id = ib_create_cm_id(host->dev, srp_cm_handler, target);
if (IS_ERR(target->cm_id)) {
ret = PTR_ERR(target->cm_id);
goto err_free;
}
ret = srp_connect_target(target);
if (ret) {
printk(KERN_ERR PFX "Connection failed\n");
goto err_cm_id;
}
ret = srp_add_target(host, target);
if (ret)
goto err_disconnect;
return count;
err_disconnect:
srp_disconnect_target(target);
err_cm_id:
ib_destroy_cm_id(target->cm_id);
err_free:
srp_free_target_ib(target);
err:
scsi_host_put(target_host);
return ret;
}
static CLASS_DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
{
struct srp_host *host =
container_of(class_dev, struct srp_host, class_dev);
return sprintf(buf, "%s\n", host->dev->name);
}
static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
static ssize_t show_port(struct class_device *class_dev, char *buf)
{
struct srp_host *host =
container_of(class_dev, struct srp_host, class_dev);
return sprintf(buf, "%d\n", host->port);
}
static CLASS_DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
static struct srp_host *srp_add_port(struct ib_device *device, u8 port)
{
struct srp_host *host;
host = kzalloc(sizeof *host, GFP_KERNEL);
if (!host)
return NULL;
INIT_LIST_HEAD(&host->target_list);
mutex_init(&host->target_mutex);
init_completion(&host->released);
host->dev = device;
host->port = port;
host->initiator_port_id[7] = port;
memcpy(host->initiator_port_id + 8, &device->node_guid, 8);
host->pd = ib_alloc_pd(device);
if (IS_ERR(host->pd))
goto err_free;
host->mr = ib_get_dma_mr(host->pd,
IB_ACCESS_LOCAL_WRITE |
IB_ACCESS_REMOTE_READ |
IB_ACCESS_REMOTE_WRITE);
if (IS_ERR(host->mr))
goto err_pd;
host->class_dev.class = &srp_class;
host->class_dev.dev = device->dma_device;
snprintf(host->class_dev.class_id, BUS_ID_SIZE, "srp-%s-%d",
device->name, port);
if (class_device_register(&host->class_dev))
goto err_mr;
if (class_device_create_file(&host->class_dev, &class_device_attr_add_target))
goto err_class;
if (class_device_create_file(&host->class_dev, &class_device_attr_ibdev))
goto err_class;
if (class_device_create_file(&host->class_dev, &class_device_attr_port))
goto err_class;
return host;
err_class:
class_device_unregister(&host->class_dev);
err_mr:
ib_dereg_mr(host->mr);
err_pd:
ib_dealloc_pd(host->pd);
err_free:
kfree(host);
return NULL;
}
static void srp_add_one(struct ib_device *device)
{
struct list_head *dev_list;
struct srp_host *host;
int s, e, p;
dev_list = kmalloc(sizeof *dev_list, GFP_KERNEL);
if (!dev_list)
return;
INIT_LIST_HEAD(dev_list);
if (device->node_type == IB_NODE_SWITCH) {
s = 0;
e = 0;
} else {
s = 1;
e = device->phys_port_cnt;
}
for (p = s; p <= e; ++p) {
host = srp_add_port(device, p);
if (host)
list_add_tail(&host->list, dev_list);
}
ib_set_client_data(device, &srp_client, dev_list);
}
static void srp_remove_one(struct ib_device *device)
{
struct list_head *dev_list;
struct srp_host *host, *tmp_host;
LIST_HEAD(target_list);
struct srp_target_port *target, *tmp_target;
unsigned long flags;
dev_list = ib_get_client_data(device, &srp_client);
list_for_each_entry_safe(host, tmp_host, dev_list, list) {
class_device_unregister(&host->class_dev);
/*
* Wait for the sysfs entry to go away, so that no new
* target ports can be created.
*/
wait_for_completion(&host->released);
/*
* Mark all target ports as removed, so we stop queueing
* commands and don't try to reconnect.
*/
mutex_lock(&host->target_mutex);
list_for_each_entry_safe(target, tmp_target,
&host->target_list, list) {
spin_lock_irqsave(target->scsi_host->host_lock, flags);
if (target->state != SRP_TARGET_REMOVED)
target->state = SRP_TARGET_REMOVED;
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
}
mutex_unlock(&host->target_mutex);
/*
* Wait for any reconnection tasks that may have
* started before we marked our target ports as
* removed, and any target port removal tasks.
*/
flush_scheduled_work();
list_for_each_entry_safe(target, tmp_target,
&host->target_list, list) {
scsi_remove_host(target->scsi_host);
srp_disconnect_target(target);
ib_destroy_cm_id(target->cm_id);
srp_free_target_ib(target);
scsi_host_put(target->scsi_host);
}
ib_dereg_mr(host->mr);
ib_dealloc_pd(host->pd);
kfree(host);
}
kfree(dev_list);
}
static int __init srp_init_module(void)
{
int ret;
ret = class_register(&srp_class);
if (ret) {
printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
return ret;
}
ret = ib_register_client(&srp_client);
if (ret) {
printk(KERN_ERR PFX "couldn't register IB client\n");
class_unregister(&srp_class);
return ret;
}
return 0;
}
static void __exit srp_cleanup_module(void)
{
ib_unregister_client(&srp_client);
class_unregister(&srp_class);
}
module_init(srp_init_module);
module_exit(srp_cleanup_module);
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