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nest-open-source / nest-guard / 1.0 / linux / 6754b876e4c89285b30ff59800d23e21ce2dbe3f / . / linux / drivers / infiniband / ulp / srp / ib_srp.c
blob: 1e1e347a771531aa767f912a5fe38d3c2f2ac2dc [file] [log] [blame]
/*
* 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.
*/
#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 <scsi/scsi_transport_srp.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 srp_sg_tablesize = SRP_DEF_SG_TABLESIZE;
static int srp_max_iu_len;
module_param(srp_sg_tablesize, int, 0444);
MODULE_PARM_DESC(srp_sg_tablesize,
"Max number of gather/scatter entries per I/O (default is 12, max 255)");
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 int mellanox_workarounds = 1;
module_param(mellanox_workarounds, int, 0444);
MODULE_PARM_DESC(mellanox_workarounds,
"Enable workarounds for Mellanox SRP target bugs if != 0");
static void srp_add_one(struct ib_device *device);
static void srp_remove_one(struct ib_device *device);
static void srp_recv_completion(struct ib_cq *cq, void *target_ptr);
static void srp_send_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 scsi_transport_template *ib_srp_transport_template;
static struct ib_client srp_client = {
.name = "srp",
.add = srp_add_one,
.remove = srp_remove_one
};
static struct ib_sa_client srp_sa_client;
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 int srp_target_is_topspin(struct srp_target_port *target)
{
static const u8 topspin_oui[3] = { 0x00, 0x05, 0xad };
static const u8 cisco_oui[3] = { 0x00, 0x1b, 0x0d };
return topspin_workarounds &&
(!memcmp(&target->ioc_guid, topspin_oui, sizeof topspin_oui) ||
!memcmp(&target->ioc_guid, cisco_oui, sizeof cisco_oui));
}
static int srp_target_is_mellanox(struct srp_target_port *target)
{
static const u8 mellanox_oui[3] = { 0x00, 0x02, 0xc9 };
return mellanox_workarounds &&
!memcmp(&target->ioc_guid, mellanox_oui, sizeof mellanox_oui);
}
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 = ib_dma_map_single(host->srp_dev->dev, iu->buf, size,
direction);
if (ib_dma_mapping_error(host->srp_dev->dev, 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;
ib_dma_unmap_single(host->srp_dev->dev, 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_pkey(target->srp_host->srp_dev->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_new_cm_id(struct srp_target_port *target)
{
struct ib_cm_id *new_cm_id;
new_cm_id = ib_create_cm_id(target->srp_host->srp_dev->dev,
srp_cm_handler, target);
if (IS_ERR(new_cm_id))
return PTR_ERR(new_cm_id);
if (target->cm_id)
ib_destroy_cm_id(target->cm_id);
target->cm_id = new_cm_id;
return 0;
}
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->recv_cq = ib_create_cq(target->srp_host->srp_dev->dev,
srp_recv_completion, NULL, target, SRP_RQ_SIZE, 0);
if (IS_ERR(target->recv_cq)) {
ret = PTR_ERR(target->recv_cq);
goto err;
}
target->send_cq = ib_create_cq(target->srp_host->srp_dev->dev,
srp_send_completion, NULL, target, SRP_SQ_SIZE, 0);
if (IS_ERR(target->send_cq)) {
ret = PTR_ERR(target->send_cq);
goto err_recv_cq;
}
ib_req_notify_cq(target->recv_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->send_cq;
init_attr->recv_cq = target->recv_cq;
target->qp = ib_create_qp(target->srp_host->srp_dev->pd, init_attr);
if (IS_ERR(target->qp)) {
ret = PTR_ERR(target->qp);
goto err_send_cq;
}
ret = srp_init_qp(target, target->qp);
if (ret)
goto err_qp;
kfree(init_attr);
return 0;
err_qp:
ib_destroy_qp(target->qp);
err_send_cq:
ib_destroy_cq(target->send_cq);
err_recv_cq:
ib_destroy_cq(target->recv_cq);
err:
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->send_cq);
ib_destroy_cq(target->recv_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; ++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)
shost_printk(KERN_ERR, target->scsi_host,
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(&srp_sa_client,
target->srp_host->srp_dev->dev,
target->srp_host->port,
&target->path,
IB_SA_PATH_REC_SERVICE_ID |
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)
shost_printk(KERN_WARNING, target->scsi_host,
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);
/*
* In the published SRP specification (draft rev. 16a), the
* port identifier format is 8 bytes of ID extension followed
* by 8 bytes of GUID. Older drafts put the two halves in the
* opposite order, so that the GUID comes first.
*
* Targets conforming to these obsolete drafts can be
* recognized by the I/O Class they report.
*/
if (target->io_class == SRP_REV10_IB_IO_CLASS) {
memcpy(req->priv.initiator_port_id,
&target->path.sgid.global.interface_id, 8);
memcpy(req->priv.initiator_port_id + 8,
&target->initiator_ext, 8);
memcpy(req->priv.target_port_id, &target->ioc_guid, 8);
memcpy(req->priv.target_port_id + 8, &target->id_ext, 8);
} else {
memcpy(req->priv.initiator_port_id,
&target->initiator_ext, 8);
memcpy(req->priv.initiator_port_id + 8,
&target->path.sgid.global.interface_id, 8);
memcpy(req->priv.target_port_id, &target->id_ext, 8);
memcpy(req->priv.target_port_id + 8, &target->ioc_guid, 8);
}
/*
* Topspin/Cisco SRP targets will reject our login unless we
* zero out the first 8 bytes of our initiator port ID and set
* the second 8 bytes to the local node GUID.
*/
if (srp_target_is_topspin(target)) {
shost_printk(KERN_DEBUG, target->scsi_host,
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.initiator_port_id + 8,
&target->srp_host->srp_dev->dev->node_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);
if (ib_send_cm_dreq(target->cm_id, NULL, 0)) {
shost_printk(KERN_DEBUG, target->scsi_host,
PFX "Sending CM DREQ failed\n");
return;
}
wait_for_completion(&target->done);
}
static void srp_remove_work(struct work_struct *work)
{
struct srp_target_port *target =
container_of(work, struct srp_target_port, work);
spin_lock_irq(target->scsi_host->host_lock);
if (target->state != SRP_TARGET_DEAD) {
spin_unlock_irq(target->scsi_host->host_lock);
return;
}
target->state = SRP_TARGET_REMOVED;
spin_unlock_irq(target->scsi_host->host_lock);
spin_lock(&target->srp_host->target_lock);
list_del(&target->list);
spin_unlock(&target->srp_host->target_lock);
srp_remove_host(target->scsi_host);
scsi_remove_host(target->scsi_host);
ib_destroy_cm_id(target->cm_id);
srp_free_target_ib(target);
scsi_host_put(target->scsi_host);
}
static int srp_connect_target(struct srp_target_port *target)
{
int retries = 3;
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;
case SRP_STALE_CONN:
/* Our current CM id was stale, and is now in timewait.
* Try to reconnect with a new one.
*/
if (!retries-- || srp_new_cm_id(target)) {
shost_printk(KERN_ERR, target->scsi_host, PFX
"giving up on stale connection\n");
target->status = -ECONNRESET;
return target->status;
}
shost_printk(KERN_ERR, target->scsi_host, PFX
"retrying stale connection\n");
break;
default:
return target->status;
}
}
}
static void srp_unmap_data(struct scsi_cmnd *scmnd,
struct srp_target_port *target,
struct srp_request *req)
{
if (!scsi_sglist(scmnd) ||
(scmnd->sc_data_direction != DMA_TO_DEVICE &&
scmnd->sc_data_direction != DMA_FROM_DEVICE))
return;
if (req->fmr) {
ib_fmr_pool_unmap(req->fmr);
req->fmr = NULL;
}
ib_dma_unmap_sg(target->srp_host->srp_dev->dev, scsi_sglist(scmnd),
scsi_sg_count(scmnd), scmnd->sc_data_direction);
}
static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
{
srp_unmap_data(req->scmnd, target, req);
list_move_tail(&req->list, &target->free_reqs);
}
static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
{
req->scmnd->result = DID_RESET << 16;
req->scmnd->scsi_done(req->scmnd);
srp_remove_req(target, req);
}
static int srp_reconnect_target(struct srp_target_port *target)
{
struct ib_qp_attr qp_attr;
struct srp_request *req, *tmp;
struct ib_wc wc;
int ret;
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.
*/
ret = srp_new_cm_id(target);
if (ret)
goto err;
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->recv_cq, 1, &wc) > 0)
; /* nothing */
while (ib_poll_cq(target->send_cq, 1, &wc) > 0)
; /* nothing */
spin_lock_irq(target->scsi_host->host_lock);
list_for_each_entry_safe(req, tmp, &target->req_queue, list)
srp_reset_req(target, req);
spin_unlock_irq(target->scsi_host->host_lock);
target->rx_head = 0;
target->tx_head = 0;
target->tx_tail = 0;
target->qp_in_error = 0;
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:
shost_printk(KERN_ERR, target->scsi_host,
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);
schedule_work(&target->work);
}
spin_unlock_irq(target->scsi_host->host_lock);
return ret;
}
static int srp_map_fmr(struct srp_target_port *target, struct scatterlist *scat,
int sg_cnt, struct srp_request *req,
struct srp_direct_buf *buf)
{
u64 io_addr = 0;
u64 *dma_pages;
u32 len;
int page_cnt;
int i, j;
int ret;
struct srp_device *dev = target->srp_host->srp_dev;
struct ib_device *ibdev = dev->dev;
struct scatterlist *sg;
if (!dev->fmr_pool)
return -ENODEV;
if (srp_target_is_mellanox(target) &&
(ib_sg_dma_address(ibdev, &scat[0]) & ~dev->fmr_page_mask))
return -EINVAL;
len = page_cnt = 0;
scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
if (ib_sg_dma_address(ibdev, sg) & ~dev->fmr_page_mask) {
if (i > 0)
return -EINVAL;
else
++page_cnt;
}
if ((ib_sg_dma_address(ibdev, sg) + dma_len) &
~dev->fmr_page_mask) {
if (i < sg_cnt - 1)
return -EINVAL;
else
++page_cnt;
}
len += dma_len;
}
page_cnt += len >> dev->fmr_page_shift;
if (page_cnt > SRP_FMR_SIZE)
return -ENOMEM;
dma_pages = kmalloc(sizeof (u64) * page_cnt, GFP_ATOMIC);
if (!dma_pages)
return -ENOMEM;
page_cnt = 0;
scsi_for_each_sg(req->scmnd, sg, sg_cnt, i) {
unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
for (j = 0; j < dma_len; j += dev->fmr_page_size)
dma_pages[page_cnt++] =
(ib_sg_dma_address(ibdev, sg) &
dev->fmr_page_mask) + j;
}
req->fmr = ib_fmr_pool_map_phys(dev->fmr_pool,
dma_pages, page_cnt, io_addr);
if (IS_ERR(req->fmr)) {
ret = PTR_ERR(req->fmr);
req->fmr = NULL;
goto out;
}
buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, &scat[0]) &
~dev->fmr_page_mask);
buf->key = cpu_to_be32(req->fmr->fmr->rkey);
buf->len = cpu_to_be32(len);
ret = 0;
out:
kfree(dma_pages);
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;
u8 fmt = SRP_DATA_DESC_DIRECT;
struct srp_device *dev;
struct ib_device *ibdev;
if (!scsi_sglist(scmnd) || 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) {
shost_printk(KERN_WARNING, target->scsi_host,
PFX "Unhandled data direction %d\n",
scmnd->sc_data_direction);
return -EINVAL;
}
nents = scsi_sg_count(scmnd);
scat = scsi_sglist(scmnd);
dev = target->srp_host->srp_dev;
ibdev = dev->dev;
count = ib_dma_map_sg(ibdev, scat, nents, scmnd->sc_data_direction);
fmt = SRP_DATA_DESC_DIRECT;
len = sizeof (struct srp_cmd) + sizeof (struct srp_direct_buf);
if (count == 1) {
/*
* The midlayer only generated a single gather/scatter
* entry, or DMA mapping coalesced everything to a
* single entry. So a direct descriptor along with
* the DMA MR suffices.
*/
struct srp_direct_buf *buf = (void *) cmd->add_data;
buf->va = cpu_to_be64(ib_sg_dma_address(ibdev, scat));
buf->key = cpu_to_be32(dev->mr->rkey);
buf->len = cpu_to_be32(ib_sg_dma_len(ibdev, scat));
} else if (srp_map_fmr(target, scat, count, req,
(void *) cmd->add_data)) {
/*
* FMR mapping failed, and the scatterlist has more
* than one entry. Generate an indirect memory
* descriptor.
*/
struct srp_indirect_buf *buf = (void *) cmd->add_data;
struct scatterlist *sg;
u32 datalen = 0;
int i;
fmt = SRP_DATA_DESC_INDIRECT;
len = sizeof (struct srp_cmd) +
sizeof (struct srp_indirect_buf) +
count * sizeof (struct srp_direct_buf);
scsi_for_each_sg(scmnd, sg, count, i) {
unsigned int dma_len = ib_sg_dma_len(ibdev, sg);
buf->desc_list[i].va =
cpu_to_be64(ib_sg_dma_address(ibdev, sg));
buf->desc_list[i].key =
cpu_to_be32(dev->mr->rkey);
buf->desc_list[i].len = cpu_to_be32(dma_len);
datalen += dma_len;
}
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->srp_dev->mr->rkey);
buf->table_desc.len =
cpu_to_be32(count * sizeof (struct srp_direct_buf));
buf->len = cpu_to_be32(datalen);
}
if (scmnd->sc_data_direction == DMA_TO_DEVICE)
cmd->buf_fmt = fmt << 4;
else
cmd->buf_fmt = fmt;
return len;
}
/*
* 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().
*
* Note:
* An upper limit for the number of allocated information units for each
* request type is:
* - SRP_IU_CMD: SRP_CMD_SQ_SIZE, since the SCSI mid-layer never queues
* more than Scsi_Host.can_queue requests.
* - SRP_IU_TSK_MGMT: SRP_TSK_MGMT_SQ_SIZE.
* - SRP_IU_RSP: 1, since a conforming SRP target never sends more than
* one unanswered SRP request to an initiator.
*/
static struct srp_iu *__srp_get_tx_iu(struct srp_target_port *target,
enum srp_iu_type iu_type)
{
s32 rsv = (iu_type == SRP_IU_TSK_MGMT) ? 0 : SRP_TSK_MGMT_SQ_SIZE;
struct srp_iu *iu;
srp_send_completion(target->send_cq, target);
if (target->tx_head - target->tx_tail >= SRP_SQ_SIZE)
return NULL;
/* Initiator responses to target requests do not consume credits */
if (target->req_lim <= rsv && iu_type != SRP_IU_RSP) {
++target->zero_req_lim;
return NULL;
}
iu = target->tx_ring[target->tx_head & SRP_SQ_MASK];
iu->type = iu_type;
return iu;
}
/*
* 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->srp_dev->mr->lkey;
wr.next = NULL;
wr.wr_id = target->tx_head & SRP_SQ_MASK;
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;
if (iu->type != SRP_IU_RSP)
--target->req_lim;
}
return ret;
}
static int srp_post_recv(struct srp_target_port *target)
{
unsigned long flags;
struct srp_iu *iu;
struct ib_sge list;
struct ib_recv_wr wr, *bad_wr;
unsigned int next;
int ret;
spin_lock_irqsave(target->scsi_host->host_lock, flags);
next = target->rx_head & SRP_RQ_MASK;
wr.wr_id = next;
iu = target->rx_ring[next];
list.addr = iu->dma;
list.length = iu->size;
list.lkey = target->srp_host->srp_dev->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;
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
return ret;
}
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)
shost_printk(KERN_ERR, target->scsi_host,
"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))
scsi_set_resid(scmnd, be32_to_cpu(rsp->data_out_res_cnt));
else if (rsp->flags & (SRP_RSP_FLAG_DIOVER | SRP_RSP_FLAG_DIUNDER))
scsi_set_resid(scmnd, be32_to_cpu(rsp->data_in_res_cnt));
if (!req->tsk_mgmt) {
scmnd->host_scribble = (void *) -1L;
scmnd->scsi_done(scmnd);
srp_remove_req(target, req);
} else
req->cmd_done = 1;
}
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
}
static int srp_response_common(struct srp_target_port *target, s32 req_delta,
void *rsp, int len)
{
struct ib_device *dev;
unsigned long flags;
struct srp_iu *iu;
int err = 1;
dev = target->srp_host->srp_dev->dev;
spin_lock_irqsave(target->scsi_host->host_lock, flags);
target->req_lim += req_delta;
iu = __srp_get_tx_iu(target, SRP_IU_RSP);
if (!iu) {
shost_printk(KERN_ERR, target->scsi_host, PFX
"no IU available to send response\n");
goto out;
}
ib_dma_sync_single_for_cpu(dev, iu->dma, len, DMA_TO_DEVICE);
memcpy(iu->buf, rsp, len);
ib_dma_sync_single_for_device(dev, iu->dma, len, DMA_TO_DEVICE);
err = __srp_post_send(target, iu, len);
if (err)
shost_printk(KERN_ERR, target->scsi_host, PFX
"unable to post response: %d\n", err);
out:
spin_unlock_irqrestore(target->scsi_host->host_lock, flags);
return err;
}
static void srp_process_cred_req(struct srp_target_port *target,
struct srp_cred_req *req)
{
struct srp_cred_rsp rsp = {
.opcode = SRP_CRED_RSP,
.tag = req->tag,
};
s32 delta = be32_to_cpu(req->req_lim_delta);
if (srp_response_common(target, delta, &rsp, sizeof rsp))
shost_printk(KERN_ERR, target->scsi_host, PFX
"problems processing SRP_CRED_REQ\n");
}
static void srp_process_aer_req(struct srp_target_port *target,
struct srp_aer_req *req)
{
struct srp_aer_rsp rsp = {
.opcode = SRP_AER_RSP,
.tag = req->tag,
};
s32 delta = be32_to_cpu(req->req_lim_delta);
shost_printk(KERN_ERR, target->scsi_host, PFX
"ignoring AER for LUN %llu\n", be64_to_cpu(req->lun));
if (srp_response_common(target, delta, &rsp, sizeof rsp))
shost_printk(KERN_ERR, target->scsi_host, PFX
"problems processing SRP_AER_REQ\n");
}
static void srp_handle_recv(struct srp_target_port *target, struct ib_wc *wc)
{
struct ib_device *dev;
struct srp_iu *iu;
int res;
u8 opcode;
iu = target->rx_ring[wc->wr_id];
dev = target->srp_host->srp_dev->dev;
ib_dma_sync_single_for_cpu(dev, iu->dma, target->max_ti_iu_len,
DMA_FROM_DEVICE);
opcode = *(u8 *) iu->buf;
if (0) {
shost_printk(KERN_ERR, target->scsi_host,
PFX "recv completion, opcode 0x%02x\n", opcode);
print_hex_dump(KERN_ERR, "", DUMP_PREFIX_OFFSET, 8, 1,
iu->buf, wc->byte_len, true);
}
switch (opcode) {
case SRP_RSP:
srp_process_rsp(target, iu->buf);
break;
case SRP_CRED_REQ:
srp_process_cred_req(target, iu->buf);
break;
case SRP_AER_REQ:
srp_process_aer_req(target, iu->buf);
break;
case SRP_T_LOGOUT:
/* XXX Handle target logout */
shost_printk(KERN_WARNING, target->scsi_host,
PFX "Got target logout request\n");
break;
default:
shost_printk(KERN_WARNING, target->scsi_host,
PFX "Unhandled SRP opcode 0x%02x\n", opcode);
break;
}
ib_dma_sync_single_for_device(dev, iu->dma, target->max_ti_iu_len,
DMA_FROM_DEVICE);
res = srp_post_recv(target);
if (res != 0)
shost_printk(KERN_ERR, target->scsi_host,
PFX "Recv failed with error code %d\n", res);
}
static void srp_recv_completion(struct ib_cq *cq, void *target_ptr)
{
struct srp_target_port *target = target_ptr;
struct ib_wc wc;
ib_req_notify_cq(cq, IB_CQ_NEXT_COMP);
while (ib_poll_cq(cq, 1, &wc) > 0) {
if (wc.status) {
shost_printk(KERN_ERR, target->scsi_host,
PFX "failed receive status %d\n",
wc.status);
target->qp_in_error = 1;
break;
}
srp_handle_recv(target, &wc);
}
}
static void srp_send_completion(struct ib_cq *cq, void *target_ptr)
{
struct srp_target_port *target = target_ptr;
struct ib_wc wc;
while (ib_poll_cq(cq, 1, &wc) > 0) {
if (wc.status) {
shost_printk(KERN_ERR, target->scsi_host,
PFX "failed send status %d\n",
wc.status);
target->qp_in_error = 1;
break;
}
++target->tx_tail;
}
}
static int srp_queuecommand_lck(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;
struct ib_device *dev;
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, SRP_IU_CMD);
if (!iu)
goto err;
dev = target->srp_host->srp_dev->dev;
ib_dma_sync_single_for_cpu(dev, iu->dma, srp_max_iu_len,
DMA_TO_DEVICE);
req = list_first_entry(&target->free_reqs, struct srp_request, list);
scmnd->scsi_done = done;
scmnd->result = 0;
scmnd->host_scribble = (void *) (long) 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->scmnd = scmnd;
req->cmd = iu;
req->cmd_done = 0;
req->tsk_mgmt = NULL;
len = srp_map_data(scmnd, target, req);
if (len < 0) {
shost_printk(KERN_ERR, target->scsi_host,
PFX "Failed to map data\n");
goto err;
}
ib_dma_sync_single_for_device(dev, iu->dma, srp_max_iu_len,
DMA_TO_DEVICE);
if (__srp_post_send(target, iu, len)) {
shost_printk(KERN_ERR, target->scsi_host, PFX "Send failed\n");
goto err_unmap;
}
list_move_tail(&req->list, &target->req_queue);
return 0;
err_unmap:
srp_unmap_data(scmnd, target, req);
err:
return SCSI_MLQUEUE_HOST_BUSY;
}
static DEF_SCSI_QCMD(srp_queuecommand)
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; ++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; ++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 Scsi_Host *shost = target->scsi_host;
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 (srp_target_is_topspin(target)) {
/*
* 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);
shost_printk(KERN_DEBUG, shost,
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 {
shost_printk(KERN_WARNING, shost,
" REJ reason: IB_CM_REJ_PORT_REDIRECT\n");
target->status = -ECONNRESET;
}
break;
case IB_CM_REJ_DUPLICATE_LOCAL_COMM_ID:
shost_printk(KERN_WARNING, shost,
" 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)
shost_printk(KERN_WARNING, shost,
PFX "SRP_LOGIN_REJ: requested max_it_iu_len too large\n");
else
shost_printk(KERN_WARNING, shost,
PFX "SRP LOGIN REJECTED, reason 0x%08x\n", reason);
} else
shost_printk(KERN_WARNING, shost,
" REJ reason: IB_CM_REJ_CONSUMER_DEFINED,"
" opcode 0x%02x\n", opcode);
target->status = -ECONNRESET;
break;
case IB_CM_REJ_STALE_CONN:
shost_printk(KERN_WARNING, shost, " REJ reason: stale connection\n");
target->status = SRP_STALE_CONN;
break;
default:
shost_printk(KERN_WARNING, shost, " 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;
int i;
switch (event->event) {
case IB_CM_REQ_ERROR:
shost_printk(KERN_DEBUG, target->scsi_host,
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);
/*
* Reserve credits for task management so we don't
* bounce requests back to the SCSI mid-layer.
*/
target->scsi_host->can_queue
= min(target->req_lim - SRP_TSK_MGMT_SQ_SIZE,
target->scsi_host->can_queue);
} else {
shost_printk(KERN_WARNING, target->scsi_host,
PFX "Unhandled RSP opcode %#x\n", opcode);
target->status = -ECONNRESET;
break;
}
if (!target->rx_ring[0]) {
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;
for (i = 0; i < SRP_RQ_SIZE; i++) {
target->status = srp_post_recv(target);
if (target->status)
break;
}
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:
shost_printk(KERN_DEBUG, target->scsi_host, PFX "REJ received\n");
comp = 1;
srp_cm_rej_handler(cm_id, event, target);
break;
case IB_CM_DREQ_RECEIVED:
shost_printk(KERN_WARNING, target->scsi_host,
PFX "DREQ received - connection closed\n");
if (ib_send_cm_drep(cm_id, NULL, 0))
shost_printk(KERN_ERR, target->scsi_host,
PFX "Sending CM DREP failed\n");
break;
case IB_CM_TIMEWAIT_EXIT:
shost_printk(KERN_ERR, target->scsi_host,
PFX "connection closed\n");
comp = 1;
target->status = 0;
break;
case IB_CM_MRA_RECEIVED:
case IB_CM_DREQ_ERROR:
case IB_CM_DREP_RECEIVED:
break;
default:
shost_printk(KERN_WARNING, target->scsi_host,
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 srp_target_port *target,
struct srp_request *req, u8 func)
{
struct ib_device *dev = target->srp_host->srp_dev->dev;
struct srp_iu *iu;
struct srp_tsk_mgmt *tsk_mgmt;
spin_lock_irq(target->scsi_host->host_lock);
if (target->state == SRP_TARGET_DEAD ||
target->state == SRP_TARGET_REMOVED) {
req->scmnd->result = DID_BAD_TARGET << 16;
goto out;
}
init_completion(&req->done);
iu = __srp_get_tx_iu(target, SRP_IU_TSK_MGMT);
if (!iu)
goto out;
ib_dma_sync_single_for_cpu(dev, iu->dma, sizeof *tsk_mgmt,
DMA_TO_DEVICE);
tsk_mgmt = iu->buf;
memset(tsk_mgmt, 0, sizeof *tsk_mgmt);
tsk_mgmt->opcode = SRP_TSK_MGMT;
tsk_mgmt->lun = cpu_to_be64((u64) req->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;
ib_dma_sync_single_for_device(dev, iu->dma, sizeof *tsk_mgmt,
DMA_TO_DEVICE);
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 -1;
return 0;
out:
spin_unlock_irq(target->scsi_host->host_lock);
return -1;
}
static int srp_find_req(struct srp_target_port *target,
struct scsi_cmnd *scmnd,
struct srp_request **req)
{
if (scmnd->host_scribble == (void *) -1L)
return -1;
*req = &target->req_ring[(long) scmnd->host_scribble];
return 0;
}
static int srp_abort(struct scsi_cmnd *scmnd)
{
struct srp_target_port *target = host_to_target(scmnd->device->host);
struct srp_request *req;
int ret = SUCCESS;
shost_printk(KERN_ERR, target->scsi_host, "SRP abort called\n");
if (target->qp_in_error)
return FAILED;
if (srp_find_req(target, scmnd, &req))
return FAILED;
if (srp_send_tsk_mgmt(target, req, SRP_TSK_ABORT_TASK))
return FAILED;
spin_lock_irq(target->scsi_host->host_lock);
if (req->cmd_done) {
srp_remove_req(target, req);
scmnd->scsi_done(scmnd);
} else if (!req->tsk_status) {
srp_remove_req(target, req);
scmnd->result = DID_ABORT << 16;
} else
ret = FAILED;
spin_unlock_irq(target->scsi_host->host_lock);
return ret;
}
static int srp_reset_device(struct scsi_cmnd *scmnd)
{
struct srp_target_port *target = host_to_target(scmnd->device->host);
struct srp_request *req, *tmp;
shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
if (target->qp_in_error)
return FAILED;
if (srp_find_req(target, scmnd, &req))
return FAILED;
if (srp_send_tsk_mgmt(target, req, SRP_TSK_LUN_RESET))
return FAILED;
if (req->tsk_status)
return FAILED;
spin_lock_irq(target->scsi_host->host_lock);
list_for_each_entry_safe(req, tmp, &target->req_queue, list)
if (req->scmnd->device == scmnd->device)
srp_reset_req(target, req);
spin_unlock_irq(target->scsi_host->host_lock);
return SUCCESS;
}
static int srp_reset_host(struct scsi_cmnd *scmnd)
{
struct srp_target_port *target = host_to_target(scmnd->device->host);
int ret = FAILED;
shost_printk(KERN_ERR, target->scsi_host, PFX "SRP reset_host called\n");
if (!srp_reconnect_target(target))
ret = SUCCESS;
return ret;
}
static ssize_t show_id_ext(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct srp_target_port *target = host_to_target(class_to_shost(dev));
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 device *dev, struct device_attribute *attr,
char *buf)
{
struct srp_target_port *target = host_to_target(class_to_shost(dev));
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 device *dev,
struct device_attribute *attr, char *buf)
{
struct srp_target_port *target = host_to_target(class_to_shost(dev));
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 device *dev, struct device_attribute *attr,
char *buf)
{
struct srp_target_port *target = host_to_target(class_to_shost(dev));
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 device *dev, struct device_attribute *attr,
char *buf)
{
struct srp_target_port *target = host_to_target(class_to_shost(dev));
if (target->state == SRP_TARGET_DEAD ||
target->state == SRP_TARGET_REMOVED)
return -ENODEV;
return sprintf(buf, "%pI6\n", target->path.dgid.raw);
}
static ssize_t show_orig_dgid(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct srp_target_port *target = host_to_target(class_to_shost(dev));
if (target->state == SRP_TARGET_DEAD ||
target->state == SRP_TARGET_REMOVED)
return -ENODEV;
return sprintf(buf, "%pI6\n", target->orig_dgid);
}
static ssize_t show_req_lim(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct srp_target_port *target = host_to_target(class_to_shost(dev));
if (target->state == SRP_TARGET_DEAD ||
target->state == SRP_TARGET_REMOVED)
return -ENODEV;
return sprintf(buf, "%d\n", target->req_lim);
}
static ssize_t show_zero_req_lim(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct srp_target_port *target = host_to_target(class_to_shost(dev));
if (target->state == SRP_TARGET_DEAD ||
target->state == SRP_TARGET_REMOVED)
return -ENODEV;
return sprintf(buf, "%d\n", target->zero_req_lim);
}
static ssize_t show_local_ib_port(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct srp_target_port *target = host_to_target(class_to_shost(dev));
return sprintf(buf, "%d\n", target->srp_host->port);
}
static ssize_t show_local_ib_device(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct srp_target_port *target = host_to_target(class_to_shost(dev));
return sprintf(buf, "%s\n", target->srp_host->srp_dev->dev->name);
}
static DEVICE_ATTR(id_ext, S_IRUGO, show_id_ext, NULL);
static DEVICE_ATTR(ioc_guid, S_IRUGO, show_ioc_guid, NULL);
static DEVICE_ATTR(service_id, S_IRUGO, show_service_id, NULL);
static DEVICE_ATTR(pkey, S_IRUGO, show_pkey, NULL);
static DEVICE_ATTR(dgid, S_IRUGO, show_dgid, NULL);
static DEVICE_ATTR(orig_dgid, S_IRUGO, show_orig_dgid, NULL);
static DEVICE_ATTR(req_lim, S_IRUGO, show_req_lim, NULL);
static DEVICE_ATTR(zero_req_lim, S_IRUGO, show_zero_req_lim, NULL);
static DEVICE_ATTR(local_ib_port, S_IRUGO, show_local_ib_port, NULL);
static DEVICE_ATTR(local_ib_device, S_IRUGO, show_local_ib_device, NULL);
static struct device_attribute *srp_host_attrs[] = {
&dev_attr_id_ext,
&dev_attr_ioc_guid,
&dev_attr_service_id,
&dev_attr_pkey,
&dev_attr_dgid,
&dev_attr_orig_dgid,
&dev_attr_req_lim,
&dev_attr_zero_req_lim,
&dev_attr_local_ib_port,
&dev_attr_local_ib_device,
NULL
};
static struct scsi_host_template srp_template = {
.module = THIS_MODULE,
.name = "InfiniBand SRP initiator",
.proc_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_CMD_SQ_SIZE,
.this_id = -1,
.cmd_per_lun = SRP_CMD_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)
{
struct srp_rport_identifiers ids;
struct srp_rport *rport;
sprintf(target->target_name, "SRP.T10:%016llX",
(unsigned long long) be64_to_cpu(target->id_ext));
if (scsi_add_host(target->scsi_host, host->srp_dev->dev->dma_device))
return -ENODEV;
memcpy(ids.port_id, &target->id_ext, 8);
memcpy(ids.port_id + 8, &target->ioc_guid, 8);
ids.roles = SRP_RPORT_ROLE_TARGET;
rport = srp_rport_add(target->scsi_host, &ids);
if (IS_ERR(rport)) {
scsi_remove_host(target->scsi_host);
return PTR_ERR(rport);
}
spin_lock(&host->target_lock);
list_add_tail(&target->list, &host->target_list);
spin_unlock(&host->target_lock);
target->state = SRP_TARGET_LIVE;
scsi_scan_target(&target->scsi_host->shost_gendev,
0, target->scsi_id, SCAN_WILD_CARD, 0);
return 0;
}
static void srp_release_dev(struct device *dev)
{
struct srp_host *host =
container_of(dev, struct srp_host, dev);
complete(&host->released);
}
static struct class srp_class = {
.name = "infiniband_srp",
.dev_release = srp_release_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_MAX_CMD_PER_LUN = 1 << 6,
SRP_OPT_IO_CLASS = 1 << 7,
SRP_OPT_INITIATOR_EXT = 1 << 8,
SRP_OPT_ALL = (SRP_OPT_ID_EXT |
SRP_OPT_IOC_GUID |
SRP_OPT_DGID |
SRP_OPT_PKEY |
SRP_OPT_SERVICE_ID),
};
static const 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_MAX_CMD_PER_LUN, "max_cmd_per_lun=%d" },
{ SRP_OPT_IO_CLASS, "io_class=%x" },
{ SRP_OPT_INITIATOR_EXT, "initiator_ext=%s" },
{ 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);
if (!p) {
ret = -ENOMEM;
goto out;
}
target->id_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
kfree(p);
break;
case SRP_OPT_IOC_GUID:
p = match_strdup(args);
if (!p) {
ret = -ENOMEM;
goto out;
}
target->ioc_guid = cpu_to_be64(simple_strtoull(p, NULL, 16));
kfree(p);
break;
case SRP_OPT_DGID:
p = match_strdup(args);
if (!p) {
ret = -ENOMEM;
goto out;
}
if (strlen(p) != 32) {
printk(KERN_WARNING PFX "bad dest GID parameter '%s'\n", p);
kfree(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);
memcpy(target->orig_dgid, target->path.dgid.raw, 16);
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);
if (!p) {
ret = -ENOMEM;
goto out;
}
target->service_id = cpu_to_be64(simple_strtoull(p, NULL, 16));
target->path.service_id = target->service_id;
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;
case SRP_OPT_MAX_CMD_PER_LUN:
if (match_int(args, &token)) {
printk(KERN_WARNING PFX "bad max cmd_per_lun parameter '%s'\n", p);
goto out;
}
target->scsi_host->cmd_per_lun = min(token, SRP_CMD_SQ_SIZE);
break;
case SRP_OPT_IO_CLASS:
if (match_hex(args, &token)) {
printk(KERN_WARNING PFX "bad IO class parameter '%s' \n", p);
goto out;
}
if (token != SRP_REV10_IB_IO_CLASS &&
token != SRP_REV16A_IB_IO_CLASS) {
printk(KERN_WARNING PFX "unknown IO class parameter value"
" %x specified (use %x or %x).\n",
token, SRP_REV10_IB_IO_CLASS, SRP_REV16A_IB_IO_CLASS);
goto out;
}
target->io_class = token;
break;
case SRP_OPT_INITIATOR_EXT:
p = match_strdup(args);
if (!p) {
ret = -ENOMEM;
goto out;
}
target->initiator_ext = cpu_to_be64(simple_strtoull(p, NULL, 16));
kfree(p);
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 device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
{
struct srp_host *host =
container_of(dev, struct srp_host, 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->transportt = ib_srp_transport_template;
target_host->max_lun = SRP_MAX_LUN;
target_host->max_cmd_len = sizeof ((struct srp_cmd *) (void *) 0L)->cdb;
target = host_to_target(target_host);
target->io_class = SRP_REV16A_IB_IO_CLASS;
target->scsi_host = target_host;
target->srp_host = host;
INIT_LIST_HEAD(&target->free_reqs);
INIT_LIST_HEAD(&target->req_queue);
for (i = 0; i < SRP_CMD_SQ_SIZE; ++i) {
target->req_ring[i].index = i;
list_add_tail(&target->req_ring[i].list, &target->free_reqs);
}
ret = srp_parse_options(buf, target);
if (ret)
goto err;
ib_query_gid(host->srp_dev->dev, host->port, 0, &target->path.sgid);
shost_printk(KERN_DEBUG, target->scsi_host, PFX
"new target: id_ext %016llx ioc_guid %016llx pkey %04x "
"service_id %016llx dgid %pI6\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),
target->path.dgid.raw);
ret = srp_create_target_ib(target);
if (ret)
goto err;
ret = srp_new_cm_id(target);
if (ret)
goto err_free;
target->qp_in_error = 0;
ret = srp_connect_target(target);
if (ret) {
shost_printk(KERN_ERR, target->scsi_host,
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 DEVICE_ATTR(add_target, S_IWUSR, NULL, srp_create_target);
static ssize_t show_ibdev(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct srp_host *host = container_of(dev, struct srp_host, dev);
return sprintf(buf, "%s\n", host->srp_dev->dev->name);
}
static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
static ssize_t show_port(struct device *dev, struct device_attribute *attr,
char *buf)
{
struct srp_host *host = container_of(dev, struct srp_host, dev);
return sprintf(buf, "%d\n", host->port);
}
static DEVICE_ATTR(port, S_IRUGO, show_port, NULL);
static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
{
struct srp_host *host;
host = kzalloc(sizeof *host, GFP_KERNEL);
if (!host)
return NULL;
INIT_LIST_HEAD(&host->target_list);
spin_lock_init(&host->target_lock);
init_completion(&host->released);
host->srp_dev = device;
host->port = port;
host->dev.class = &srp_class;
host->dev.parent = device->dev->dma_device;
dev_set_name(&host->dev, "srp-%s-%d", device->dev->name, port);
if (device_register(&host->dev))
goto free_host;
if (device_create_file(&host->dev, &dev_attr_add_target))
goto err_class;
if (device_create_file(&host->dev, &dev_attr_ibdev))
goto err_class;
if (device_create_file(&host->dev, &dev_attr_port))
goto err_class;
return host;
err_class:
device_unregister(&host->dev);
free_host:
kfree(host);
return NULL;
}
static void srp_add_one(struct ib_device *device)
{
struct srp_device *srp_dev;
struct ib_device_attr *dev_attr;
struct ib_fmr_pool_param fmr_param;
struct srp_host *host;
int s, e, p;
dev_attr = kmalloc(sizeof *dev_attr, GFP_KERNEL);
if (!dev_attr)
return;
if (ib_query_device(device, dev_attr)) {
printk(KERN_WARNING PFX "Query device failed for %s\n",
device->name);
goto free_attr;
}
srp_dev = kmalloc(sizeof *srp_dev, GFP_KERNEL);
if (!srp_dev)
goto free_attr;
/*
* Use the smallest page size supported by the HCA, down to a
* minimum of 512 bytes (which is the smallest sector that a
* SCSI command will ever carry).
*/
srp_dev->fmr_page_shift = max(9, ffs(dev_attr->page_size_cap) - 1);
srp_dev->fmr_page_size = 1 << srp_dev->fmr_page_shift;
srp_dev->fmr_page_mask = ~((u64) srp_dev->fmr_page_size - 1);
INIT_LIST_HEAD(&srp_dev->dev_list);
srp_dev->dev = device;
srp_dev->pd = ib_alloc_pd(device);
if (IS_ERR(srp_dev->pd))
goto free_dev;
srp_dev->mr = ib_get_dma_mr(srp_dev->pd,
IB_ACCESS_LOCAL_WRITE |
IB_ACCESS_REMOTE_READ |
IB_ACCESS_REMOTE_WRITE);
if (IS_ERR(srp_dev->mr))
goto err_pd;
memset(&fmr_param, 0, sizeof fmr_param);
fmr_param.pool_size = SRP_FMR_POOL_SIZE;
fmr_param.dirty_watermark = SRP_FMR_DIRTY_SIZE;
fmr_param.cache = 1;
fmr_param.max_pages_per_fmr = SRP_FMR_SIZE;
fmr_param.page_shift = srp_dev->fmr_page_shift;
fmr_param.access = (IB_ACCESS_LOCAL_WRITE |
IB_ACCESS_REMOTE_WRITE |
IB_ACCESS_REMOTE_READ);
srp_dev->fmr_pool = ib_create_fmr_pool(srp_dev->pd, &fmr_param);
if (IS_ERR(srp_dev->fmr_pool))
srp_dev->fmr_pool = NULL;
if (device->node_type == RDMA_NODE_IB_SWITCH) {
s = 0;
e = 0;
} else {
s = 1;
e = device->phys_port_cnt;
}
for (p = s; p <= e; ++p) {
host = srp_add_port(srp_dev, p);
if (host)
list_add_tail(&host->list, &srp_dev->dev_list);
}
ib_set_client_data(device, &srp_client, srp_dev);
goto free_attr;
err_pd:
ib_dealloc_pd(srp_dev->pd);
free_dev:
kfree(srp_dev);
free_attr:
kfree(dev_attr);
}
static void srp_remove_one(struct ib_device *device)
{
struct srp_device *srp_dev;
struct srp_host *host, *tmp_host;
LIST_HEAD(target_list);
struct srp_target_port *target, *tmp_target;
srp_dev = ib_get_client_data(device, &srp_client);
list_for_each_entry_safe(host, tmp_host, &srp_dev->dev_list, list) {
device_unregister(&host->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.
*/
spin_lock(&host->target_lock);
list_for_each_entry(target, &host->target_list, list) {
spin_lock_irq(target->scsi_host->host_lock);
target->state = SRP_TARGET_REMOVED;
spin_unlock_irq(target->scsi_host->host_lock);
}
spin_unlock(&host->target_lock);
/*
* 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) {
srp_remove_host(target->scsi_host);
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);
}
kfree(host);
}
if (srp_dev->fmr_pool)
ib_destroy_fmr_pool(srp_dev->fmr_pool);
ib_dereg_mr(srp_dev->mr);
ib_dealloc_pd(srp_dev->pd);
kfree(srp_dev);
}
static struct srp_function_template ib_srp_transport_functions = {
};
static int __init srp_init_module(void)
{
int ret;
BUILD_BUG_ON_NOT_POWER_OF_2(SRP_SQ_SIZE);
BUILD_BUG_ON_NOT_POWER_OF_2(SRP_RQ_SIZE);
if (srp_sg_tablesize > 255) {
printk(KERN_WARNING PFX "Clamping srp_sg_tablesize to 255\n");
srp_sg_tablesize = 255;
}
ib_srp_transport_template =
srp_attach_transport(&ib_srp_transport_functions);
if (!ib_srp_transport_template)
return -ENOMEM;
srp_template.sg_tablesize = srp_sg_tablesize;
srp_max_iu_len = (sizeof (struct srp_cmd) +
sizeof (struct srp_indirect_buf) +
srp_sg_tablesize * 16);
ret = class_register(&srp_class);
if (ret) {
printk(KERN_ERR PFX "couldn't register class infiniband_srp\n");
srp_release_transport(ib_srp_transport_template);
return ret;
}
ib_sa_register_client(&srp_sa_client);
ret = ib_register_client(&srp_client);
if (ret) {
printk(KERN_ERR PFX "couldn't register IB client\n");
srp_release_transport(ib_srp_transport_template);
ib_sa_unregister_client(&srp_sa_client);
class_unregister(&srp_class);
return ret;
}
return 0;
}
static void __exit srp_cleanup_module(void)
{
ib_unregister_client(&srp_client);
ib_sa_unregister_client(&srp_sa_client);
class_unregister(&srp_class);
srp_release_transport(ib_srp_transport_template);
}
module_init(srp_init_module);
module_exit(srp_cleanup_module);