GNU Linux-libre 4.9.287-gnu1
[releases.git] / drivers / infiniband / hw / cxgb3 / iwch.c
1 /*
2  * Copyright (c) 2006 Chelsio, Inc. All rights reserved.
3  *
4  * This software is available to you under a choice of one of two
5  * licenses.  You may choose to be licensed under the terms of the GNU
6  * General Public License (GPL) Version 2, available from the file
7  * COPYING in the main directory of this source tree, or the
8  * OpenIB.org BSD license below:
9  *
10  *     Redistribution and use in source and binary forms, with or
11  *     without modification, are permitted provided that the following
12  *     conditions are met:
13  *
14  *      - Redistributions of source code must retain the above
15  *        copyright notice, this list of conditions and the following
16  *        disclaimer.
17  *
18  *      - Redistributions in binary form must reproduce the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer in the documentation and/or other materials
21  *        provided with the distribution.
22  *
23  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
24  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
25  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
26  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
27  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
28  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
29  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
30  * SOFTWARE.
31  */
32 #include <linux/module.h>
33 #include <linux/moduleparam.h>
34
35 #include <rdma/ib_verbs.h>
36
37 #include "cxgb3_offload.h"
38 #include "iwch_provider.h"
39 #include <rdma/cxgb3-abi.h>
40 #include "iwch.h"
41 #include "iwch_cm.h"
42
43 #define DRV_VERSION "1.1"
44
45 MODULE_AUTHOR("Boyd Faulkner, Steve Wise");
46 MODULE_DESCRIPTION("Chelsio T3 RDMA Driver");
47 MODULE_LICENSE("Dual BSD/GPL");
48 MODULE_VERSION(DRV_VERSION);
49
50 static void open_rnic_dev(struct t3cdev *);
51 static void close_rnic_dev(struct t3cdev *);
52 static void iwch_event_handler(struct t3cdev *, u32, u32);
53
54 struct cxgb3_client t3c_client = {
55         .name = "iw_cxgb3",
56         .add = open_rnic_dev,
57         .remove = close_rnic_dev,
58         .handlers = t3c_handlers,
59         .redirect = iwch_ep_redirect,
60         .event_handler = iwch_event_handler
61 };
62
63 static LIST_HEAD(dev_list);
64 static DEFINE_MUTEX(dev_mutex);
65
66 static int disable_qp_db(int id, void *p, void *data)
67 {
68         struct iwch_qp *qhp = p;
69
70         cxio_disable_wq_db(&qhp->wq);
71         return 0;
72 }
73
74 static int enable_qp_db(int id, void *p, void *data)
75 {
76         struct iwch_qp *qhp = p;
77
78         if (data)
79                 ring_doorbell(qhp->rhp->rdev.ctrl_qp.doorbell, qhp->wq.qpid);
80         cxio_enable_wq_db(&qhp->wq);
81         return 0;
82 }
83
84 static void disable_dbs(struct iwch_dev *rnicp)
85 {
86         spin_lock_irq(&rnicp->lock);
87         idr_for_each(&rnicp->qpidr, disable_qp_db, NULL);
88         spin_unlock_irq(&rnicp->lock);
89 }
90
91 static void enable_dbs(struct iwch_dev *rnicp, int ring_db)
92 {
93         spin_lock_irq(&rnicp->lock);
94         idr_for_each(&rnicp->qpidr, enable_qp_db,
95                      (void *)(unsigned long)ring_db);
96         spin_unlock_irq(&rnicp->lock);
97 }
98
99 static void iwch_db_drop_task(struct work_struct *work)
100 {
101         struct iwch_dev *rnicp = container_of(work, struct iwch_dev,
102                                               db_drop_task.work);
103         enable_dbs(rnicp, 1);
104 }
105
106 static void rnic_init(struct iwch_dev *rnicp)
107 {
108         PDBG("%s iwch_dev %p\n", __func__,  rnicp);
109         idr_init(&rnicp->cqidr);
110         idr_init(&rnicp->qpidr);
111         idr_init(&rnicp->mmidr);
112         spin_lock_init(&rnicp->lock);
113         INIT_DELAYED_WORK(&rnicp->db_drop_task, iwch_db_drop_task);
114
115         rnicp->attr.max_qps = T3_MAX_NUM_QP - 32;
116         rnicp->attr.max_wrs = T3_MAX_QP_DEPTH;
117         rnicp->attr.max_sge_per_wr = T3_MAX_SGE;
118         rnicp->attr.max_sge_per_rdma_write_wr = T3_MAX_SGE;
119         rnicp->attr.max_cqs = T3_MAX_NUM_CQ - 1;
120         rnicp->attr.max_cqes_per_cq = T3_MAX_CQ_DEPTH;
121         rnicp->attr.max_mem_regs = cxio_num_stags(&rnicp->rdev);
122         rnicp->attr.max_phys_buf_entries = T3_MAX_PBL_SIZE;
123         rnicp->attr.max_pds = T3_MAX_NUM_PD - 1;
124         rnicp->attr.mem_pgsizes_bitmask = T3_PAGESIZE_MASK;
125         rnicp->attr.max_mr_size = T3_MAX_MR_SIZE;
126         rnicp->attr.can_resize_wq = 0;
127         rnicp->attr.max_rdma_reads_per_qp = 8;
128         rnicp->attr.max_rdma_read_resources =
129             rnicp->attr.max_rdma_reads_per_qp * rnicp->attr.max_qps;
130         rnicp->attr.max_rdma_read_qp_depth = 8; /* IRD */
131         rnicp->attr.max_rdma_read_depth =
132             rnicp->attr.max_rdma_read_qp_depth * rnicp->attr.max_qps;
133         rnicp->attr.rq_overflow_handled = 0;
134         rnicp->attr.can_modify_ird = 0;
135         rnicp->attr.can_modify_ord = 0;
136         rnicp->attr.max_mem_windows = rnicp->attr.max_mem_regs - 1;
137         rnicp->attr.stag0_value = 1;
138         rnicp->attr.zbva_support = 1;
139         rnicp->attr.local_invalidate_fence = 1;
140         rnicp->attr.cq_overflow_detection = 1;
141         return;
142 }
143
144 static void open_rnic_dev(struct t3cdev *tdev)
145 {
146         struct iwch_dev *rnicp;
147
148         PDBG("%s t3cdev %p\n", __func__,  tdev);
149         printk_once(KERN_INFO MOD "Chelsio T3 RDMA Driver - version %s\n",
150                        DRV_VERSION);
151         rnicp = (struct iwch_dev *)ib_alloc_device(sizeof(*rnicp));
152         if (!rnicp) {
153                 printk(KERN_ERR MOD "Cannot allocate ib device\n");
154                 return;
155         }
156         rnicp->rdev.ulp = rnicp;
157         rnicp->rdev.t3cdev_p = tdev;
158
159         mutex_lock(&dev_mutex);
160
161         if (cxio_rdev_open(&rnicp->rdev)) {
162                 mutex_unlock(&dev_mutex);
163                 printk(KERN_ERR MOD "Unable to open CXIO rdev\n");
164                 ib_dealloc_device(&rnicp->ibdev);
165                 return;
166         }
167
168         rnic_init(rnicp);
169
170         list_add_tail(&rnicp->entry, &dev_list);
171         mutex_unlock(&dev_mutex);
172
173         if (iwch_register_device(rnicp)) {
174                 printk(KERN_ERR MOD "Unable to register device\n");
175                 close_rnic_dev(tdev);
176         }
177         printk(KERN_INFO MOD "Initialized device %s\n",
178                pci_name(rnicp->rdev.rnic_info.pdev));
179         return;
180 }
181
182 static void close_rnic_dev(struct t3cdev *tdev)
183 {
184         struct iwch_dev *dev, *tmp;
185         PDBG("%s t3cdev %p\n", __func__,  tdev);
186         mutex_lock(&dev_mutex);
187         list_for_each_entry_safe(dev, tmp, &dev_list, entry) {
188                 if (dev->rdev.t3cdev_p == tdev) {
189                         dev->rdev.flags = CXIO_ERROR_FATAL;
190                         synchronize_net();
191                         cancel_delayed_work_sync(&dev->db_drop_task);
192                         list_del(&dev->entry);
193                         iwch_unregister_device(dev);
194                         cxio_rdev_close(&dev->rdev);
195                         idr_destroy(&dev->cqidr);
196                         idr_destroy(&dev->qpidr);
197                         idr_destroy(&dev->mmidr);
198                         ib_dealloc_device(&dev->ibdev);
199                         break;
200                 }
201         }
202         mutex_unlock(&dev_mutex);
203 }
204
205 static void iwch_event_handler(struct t3cdev *tdev, u32 evt, u32 port_id)
206 {
207         struct cxio_rdev *rdev = tdev->ulp;
208         struct iwch_dev *rnicp;
209         struct ib_event event;
210         u32 portnum = port_id + 1;
211         int dispatch = 0;
212
213         if (!rdev)
214                 return;
215         rnicp = rdev_to_iwch_dev(rdev);
216         switch (evt) {
217         case OFFLOAD_STATUS_DOWN: {
218                 rdev->flags = CXIO_ERROR_FATAL;
219                 synchronize_net();
220                 event.event  = IB_EVENT_DEVICE_FATAL;
221                 dispatch = 1;
222                 break;
223                 }
224         case OFFLOAD_PORT_DOWN: {
225                 event.event  = IB_EVENT_PORT_ERR;
226                 dispatch = 1;
227                 break;
228                 }
229         case OFFLOAD_PORT_UP: {
230                 event.event  = IB_EVENT_PORT_ACTIVE;
231                 dispatch = 1;
232                 break;
233                 }
234         case OFFLOAD_DB_FULL: {
235                 disable_dbs(rnicp);
236                 break;
237                 }
238         case OFFLOAD_DB_EMPTY: {
239                 enable_dbs(rnicp, 1);
240                 break;
241                 }
242         case OFFLOAD_DB_DROP: {
243                 unsigned long delay = 1000;
244                 unsigned short r;
245
246                 disable_dbs(rnicp);
247                 get_random_bytes(&r, 2);
248                 delay += r & 1023;
249
250                 /*
251                  * delay is between 1000-2023 usecs.
252                  */
253                 schedule_delayed_work(&rnicp->db_drop_task,
254                         usecs_to_jiffies(delay));
255                 break;
256                 }
257         }
258
259         if (dispatch) {
260                 event.device = &rnicp->ibdev;
261                 event.element.port_num = portnum;
262                 ib_dispatch_event(&event);
263         }
264
265         return;
266 }
267
268 static int __init iwch_init_module(void)
269 {
270         int err;
271
272         err = cxio_hal_init();
273         if (err)
274                 return err;
275         err = iwch_cm_init();
276         if (err)
277                 return err;
278         cxio_register_ev_cb(iwch_ev_dispatch);
279         cxgb3_register_client(&t3c_client);
280         return 0;
281 }
282
283 static void __exit iwch_exit_module(void)
284 {
285         cxgb3_unregister_client(&t3c_client);
286         cxio_unregister_ev_cb(iwch_ev_dispatch);
287         iwch_cm_term();
288         cxio_hal_exit();
289 }
290
291 module_init(iwch_init_module);
292 module_exit(iwch_exit_module);