/*
* Copyright (c) 2006 Chelsio, Inc. All rights reserved.
*
* This software is available to you under a choice of one of two
* licenses. You may choose to be licensed under the terms of the GNU
* General Public License (GPL) Version 2, available from the file
* COPYING in the main directory of this source tree, or the
* OpenIB.org BSD license below:
*
* Redistribution and use in source and binary forms, with or
* without modification, are permitted provided that the following
* conditions are met:
*
* - Redistributions of source code must retain the above
* copyright notice, this list of conditions and the following
* disclaimer.
*
* - Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <rdma/ib_verbs.h>
#include "cxgb3_offload.h"
#include "iwch_provider.h"
#include "iwch_user.h"
#include "iwch.h"
#include "iwch_cm.h"
#define DRV_VERSION "1.1"
MODULE_AUTHOR("Boyd Faulkner, Steve Wise");
MODULE_DESCRIPTION("Chelsio T3 RDMA Driver");
MODULE_LICENSE("Dual BSD/GPL");
MODULE_VERSION(DRV_VERSION);
cxgb3_cpl_handler_func t3c_handlers[NUM_CPL_CMDS];
static void open_rnic_dev(struct t3cdev *);
static void close_rnic_dev(struct t3cdev *);
static void iwch_event_handler(struct t3cdev *, u32, u32);
struct cxgb3_client t3c_client = {
.name = "iw_cxgb3",
.add = open_rnic_dev,
.remove = close_rnic_dev,
.handlers = t3c_handlers,
.redirect = iwch_ep_redirect,
.event_handler = iwch_event_handler
};
static LIST_HEAD(dev_list);
static DEFINE_MUTEX(dev_mutex);
static int disable_qp_db(int id, void *p, void *data)
{
struct iwch_qp *qhp = p;
cxio_disable_wq_db(&qhp->wq);
return 0;
}
static int enable_qp_db(int id, void *p, void *data)
{
struct iwch_qp *qhp = p;
if (data)
ring_doorbell(qhp->rhp->rdev.ctrl_qp.doorbell, qhp->wq.qpid);
cxio_enable_wq_db(&qhp->wq);
return 0;
}
static void disable_dbs(struct iwch_dev *rnicp)
{
spin_lock_irq(&rnicp->lock);
idr_for_each(&rnicp->qpidr, disable_qp_db, NULL);
spin_unlock_irq(&rnicp->lock);
}
static void enable_dbs(struct iwch_dev *rnicp, int ring_db)
{
spin_lock_irq(&rnicp->lock);
idr_for_each(&rnicp->qpidr, enable_qp_db,
(void *)(unsigned long)ring_db);
spin_unlock_irq(&rnicp->lock);
}
static void iwch_db_drop_task(struct work_struct *work)
{
struct iwch_dev *rnicp = container_of(work, struct iwch_dev,
db_drop_task.work);
enable_dbs(rnicp, 1);
}
static void rnic_init(struct iwch_dev *rnicp)
{
PDBG("%s iwch_dev %p\n", __func__, rnicp);
idr_init(&rnicp->cqidr);
idr_init(&rnicp->qpidr);
idr_init(&rnicp->mmidr);
spin_lock_init(&rnicp->lock);
INIT_DELAYED_WORK(&rnicp->db_drop_task, iwch_db_drop_task);
rnicp->attr.max_qps = T3_MAX_NUM_QP - 32;
rnicp->attr.max_wrs = T3_MAX_QP_DEPTH;
rnicp->attr.max_sge_per_wr = T3_MAX_SGE;
rnicp->attr.max_sge_per_rdma_write_wr = T3_MAX_SGE;
rnicp->attr.max_cqs = T3_MAX_NUM_CQ - 1;
rnicp->attr.max_cqes_per_cq = T3_MAX_CQ_DEPTH;
rnicp->attr.max_mem_regs = cxio_num_stags(&rnicp->rdev);
rnicp->attr.max_phys_buf_entries = T3_MAX_PBL_SIZE;
rnicp->attr.max_pds = T3_MAX_NUM_PD - 1;
rnicp->attr.mem_pgsizes_bitmask = T3_PAGESIZE_MASK;
rnicp->attr.max_mr_size = T3_MAX_MR_SIZE;
rnicp->attr.can_resize_wq = 0;
rnicp->attr.max_rdma_reads_per_qp = 8;
rnicp->attr.max_rdma_read_resources =
rnicp->attr.max_rdma_reads_per_qp * rnicp->attr.max_qps;
rnicp->attr.max_rdma_read_qp_depth = 8; /* IRD */
rnicp->attr.max_rdma_read_depth =
rnicp->attr.max_rdma_read_qp_depth * rnicp->attr.max_qps;
rnicp->attr.rq_overflow_handled = 0;
rnicp->attr.can_modify_ird = 0;
rnicp->attr.can_modify_ord = 0;
rnicp->attr.max_mem_windows = rnicp->attr.max_mem_regs - 1;
rnicp->attr.stag0_value = 1;
rnicp->attr.zbva_support = 1;
rnicp->attr.local_invalidate_fence = 1;
rnicp->attr.cq_overflow_detection = 1;
return;
}
static void open_rnic_dev(struct t3cdev *tdev)
{
struct iwch_dev *rnicp;
PDBG("%s t3cdev %p\n", __func__, tdev);
printk_once(KERN_INFO MOD "Chelsio T3 RDMA Driver - version %s\n",
DRV_VERSION);
rnicp = (struct iwch_dev *)ib_alloc_device(sizeof(*rnicp));
if (!rnicp) {
printk(KERN_ERR MOD "Cannot allocate ib device\n");
return;
}
rnicp->rdev.ulp = rnicp;
rnicp->rdev.t3cdev_p = tdev;
mutex_lock(&dev_mutex);
if (cxio_rdev_open(&rnicp->rdev)) {
mutex_unlock(&dev_mutex);
printk(KERN_ERR MOD "Unable to open CXIO rdev\n");
ib_dealloc_device(&rnicp->ibdev);
return;
}
rnic_init(rnicp);
list_add_tail(&rnicp->entry, &dev_list);
mutex_unlock(&dev_mutex);
if (iwch_register_device(rnicp)) {
printk(KERN_ERR MOD "Unable to register device\n");
close_rnic_dev(tdev);
}
printk(KERN_INFO MOD "Initialized device %s\n",
pci_name(rnicp->rdev.rnic_info.pdev));
return;
}
static void close_rnic_dev(struct t3cdev *tdev)
{
struct iwch_dev *dev, *tmp;
PDBG("%s t3cdev %p\n", __func__, tdev);
mutex_lock(&dev_mutex);
list_for_each_entry_safe(dev, tmp, &dev_list, entry) {
if (dev->rdev.t3cdev_p == tdev) {
dev->rdev.flags = CXIO_ERROR_FATAL;
cancel_delayed_work_sync(&dev->db_drop_task);
list_del(&dev->entry);
iwch_unregister_device(dev);
cxio_rdev_close(&dev->rdev);
idr_destroy(&dev->cqidr);
idr_destroy(&dev->qpidr);
idr_destroy(&dev->mmidr);
ib_dealloc_device(&dev->ibdev);
break;
}
}
mutex_unlock(&dev_mutex);
}
static void iwch_event_handler(struct t3cdev *tdev, u32 evt, u32 port_id)
{
struct cxio_rdev *rdev = tdev->ulp;
struct iwch_dev *rnicp;
struct ib_event event;
u32 portnum = port_id + 1;
int dispatch = 0;
if (!rdev)
return;
rnicp = rdev_to_iwch_dev(rdev);
switch (evt) {
case OFFLOAD_STATUS_DOWN: {
rdev->flags = CXIO_ERROR_FATAL;
event.event = IB_EVENT_DEVICE_FATAL;
dispatch = 1;
break;
}
case OFFLOAD_PORT_DOWN: {
event.event = IB_EVENT_PORT_ERR;
dispatch = 1;
break;
}
case OFFLOAD_PORT_UP: {
event.event = IB_EVENT_PORT_ACTIVE;
dispatch = 1;
break;
}
case OFFLOAD_DB_FULL: {
disable_dbs(rnicp);
break;
}
case OFFLOAD_DB_EMPTY: {
enable_dbs(rnicp, 1);
break;
}
case OFFLOAD_DB_DROP: {
unsigned long delay = 1000;
unsigned short r;
disable_dbs(rnicp);
get_random_bytes(&r, 2);
delay += r & 1023;
/*
* delay is between 1000-2023 usecs.
*/
schedule_delayed_work(&rnicp->db_drop_task,
usecs_to_jiffies(delay));
break;
}
}
if (dispatch) {
event.device = &rnicp->ibdev;
event.element.port_num = portnum;
ib_dispatch_event(&event);
}
return;
}
static int __init iwch_init_module(void)
{
int err;
err = cxio_hal_init();
if (err)
return err;
err = iwch_cm_init();
if (err)
return err;
cxio_register_ev_cb(iwch_ev_dispatch);
cxgb3_register_client(&t3c_client);
return 0;
}
static void __exit iwch_exit_module(void)
{
cxgb3_unregister_client(&t3c_client);
cxio_unregister_ev_cb(iwch_ev_dispatch);
iwch_cm_term();
cxio_hal_exit();
}
module_init(iwch_init_module);
module_exit(iwch_exit_module);
