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
49 static void open_rnic_dev(struct t3cdev *);
50 static void close_rnic_dev(struct t3cdev *);
51 static void iwch_event_handler(struct t3cdev *, u32, u32);
52
53 struct cxgb3_client t3c_client = {
54 .name = "iw_cxgb3",
55 .add = open_rnic_dev,
56 .remove = close_rnic_dev,
57 .handlers = t3c_handlers,
58 .redirect = iwch_ep_redirect,
59 .event_handler = iwch_event_handler
60 };
61
62 static LIST_HEAD(dev_list);
63 static DEFINE_MUTEX(dev_mutex);
64
disable_qp_db(int id,void * p,void * data)65 static int disable_qp_db(int id, void *p, void *data)
66 {
67 struct iwch_qp *qhp = p;
68
69 cxio_disable_wq_db(&qhp->wq);
70 return 0;
71 }
72
enable_qp_db(int id,void * p,void * data)73 static int enable_qp_db(int id, void *p, void *data)
74 {
75 struct iwch_qp *qhp = p;
76
77 if (data)
78 ring_doorbell(qhp->rhp->rdev.ctrl_qp.doorbell, qhp->wq.qpid);
79 cxio_enable_wq_db(&qhp->wq);
80 return 0;
81 }
82
disable_dbs(struct iwch_dev * rnicp)83 static void disable_dbs(struct iwch_dev *rnicp)
84 {
85 spin_lock_irq(&rnicp->lock);
86 idr_for_each(&rnicp->qpidr, disable_qp_db, NULL);
87 spin_unlock_irq(&rnicp->lock);
88 }
89
enable_dbs(struct iwch_dev * rnicp,int ring_db)90 static void enable_dbs(struct iwch_dev *rnicp, int ring_db)
91 {
92 spin_lock_irq(&rnicp->lock);
93 idr_for_each(&rnicp->qpidr, enable_qp_db,
94 (void *)(unsigned long)ring_db);
95 spin_unlock_irq(&rnicp->lock);
96 }
97
iwch_db_drop_task(struct work_struct * work)98 static void iwch_db_drop_task(struct work_struct *work)
99 {
100 struct iwch_dev *rnicp = container_of(work, struct iwch_dev,
101 db_drop_task.work);
102 enable_dbs(rnicp, 1);
103 }
104
rnic_init(struct iwch_dev * rnicp)105 static void rnic_init(struct iwch_dev *rnicp)
106 {
107 pr_debug("%s iwch_dev %p\n", __func__, rnicp);
108 idr_init(&rnicp->cqidr);
109 idr_init(&rnicp->qpidr);
110 idr_init(&rnicp->mmidr);
111 spin_lock_init(&rnicp->lock);
112 INIT_DELAYED_WORK(&rnicp->db_drop_task, iwch_db_drop_task);
113
114 rnicp->attr.max_qps = T3_MAX_NUM_QP - 32;
115 rnicp->attr.max_wrs = T3_MAX_QP_DEPTH;
116 rnicp->attr.max_sge_per_wr = T3_MAX_SGE;
117 rnicp->attr.max_sge_per_rdma_write_wr = T3_MAX_SGE;
118 rnicp->attr.max_cqs = T3_MAX_NUM_CQ - 1;
119 rnicp->attr.max_cqes_per_cq = T3_MAX_CQ_DEPTH;
120 rnicp->attr.max_mem_regs = cxio_num_stags(&rnicp->rdev);
121 rnicp->attr.max_phys_buf_entries = T3_MAX_PBL_SIZE;
122 rnicp->attr.max_pds = T3_MAX_NUM_PD - 1;
123 rnicp->attr.mem_pgsizes_bitmask = T3_PAGESIZE_MASK;
124 rnicp->attr.max_mr_size = T3_MAX_MR_SIZE;
125 rnicp->attr.can_resize_wq = 0;
126 rnicp->attr.max_rdma_reads_per_qp = 8;
127 rnicp->attr.max_rdma_read_resources =
128 rnicp->attr.max_rdma_reads_per_qp * rnicp->attr.max_qps;
129 rnicp->attr.max_rdma_read_qp_depth = 8; /* IRD */
130 rnicp->attr.max_rdma_read_depth =
131 rnicp->attr.max_rdma_read_qp_depth * rnicp->attr.max_qps;
132 rnicp->attr.rq_overflow_handled = 0;
133 rnicp->attr.can_modify_ird = 0;
134 rnicp->attr.can_modify_ord = 0;
135 rnicp->attr.max_mem_windows = rnicp->attr.max_mem_regs - 1;
136 rnicp->attr.stag0_value = 1;
137 rnicp->attr.zbva_support = 1;
138 rnicp->attr.local_invalidate_fence = 1;
139 rnicp->attr.cq_overflow_detection = 1;
140 return;
141 }
142
open_rnic_dev(struct t3cdev * tdev)143 static void open_rnic_dev(struct t3cdev *tdev)
144 {
145 struct iwch_dev *rnicp;
146
147 pr_debug("%s t3cdev %p\n", __func__, tdev);
148 pr_info_once("Chelsio T3 RDMA Driver - version %s\n", DRV_VERSION);
149 rnicp = (struct iwch_dev *)ib_alloc_device(sizeof(*rnicp));
150 if (!rnicp) {
151 pr_err("Cannot allocate ib device\n");
152 return;
153 }
154 rnicp->rdev.ulp = rnicp;
155 rnicp->rdev.t3cdev_p = tdev;
156
157 mutex_lock(&dev_mutex);
158
159 if (cxio_rdev_open(&rnicp->rdev)) {
160 mutex_unlock(&dev_mutex);
161 pr_err("Unable to open CXIO rdev\n");
162 ib_dealloc_device(&rnicp->ibdev);
163 return;
164 }
165
166 rnic_init(rnicp);
167
168 list_add_tail(&rnicp->entry, &dev_list);
169 mutex_unlock(&dev_mutex);
170
171 if (iwch_register_device(rnicp)) {
172 pr_err("Unable to register device\n");
173 close_rnic_dev(tdev);
174 }
175 pr_info("Initialized device %s\n",
176 pci_name(rnicp->rdev.rnic_info.pdev));
177 return;
178 }
179
close_rnic_dev(struct t3cdev * tdev)180 static void close_rnic_dev(struct t3cdev *tdev)
181 {
182 struct iwch_dev *dev, *tmp;
183 pr_debug("%s t3cdev %p\n", __func__, tdev);
184 mutex_lock(&dev_mutex);
185 list_for_each_entry_safe(dev, tmp, &dev_list, entry) {
186 if (dev->rdev.t3cdev_p == tdev) {
187 dev->rdev.flags = CXIO_ERROR_FATAL;
188 synchronize_net();
189 cancel_delayed_work_sync(&dev->db_drop_task);
190 list_del(&dev->entry);
191 iwch_unregister_device(dev);
192 cxio_rdev_close(&dev->rdev);
193 idr_destroy(&dev->cqidr);
194 idr_destroy(&dev->qpidr);
195 idr_destroy(&dev->mmidr);
196 ib_dealloc_device(&dev->ibdev);
197 break;
198 }
199 }
200 mutex_unlock(&dev_mutex);
201 }
202
iwch_event_handler(struct t3cdev * tdev,u32 evt,u32 port_id)203 static void iwch_event_handler(struct t3cdev *tdev, u32 evt, u32 port_id)
204 {
205 struct cxio_rdev *rdev = tdev->ulp;
206 struct iwch_dev *rnicp;
207 struct ib_event event;
208 u32 portnum = port_id + 1;
209 int dispatch = 0;
210
211 if (!rdev)
212 return;
213 rnicp = rdev_to_iwch_dev(rdev);
214 switch (evt) {
215 case OFFLOAD_STATUS_DOWN: {
216 rdev->flags = CXIO_ERROR_FATAL;
217 synchronize_net();
218 event.event = IB_EVENT_DEVICE_FATAL;
219 dispatch = 1;
220 break;
221 }
222 case OFFLOAD_PORT_DOWN: {
223 event.event = IB_EVENT_PORT_ERR;
224 dispatch = 1;
225 break;
226 }
227 case OFFLOAD_PORT_UP: {
228 event.event = IB_EVENT_PORT_ACTIVE;
229 dispatch = 1;
230 break;
231 }
232 case OFFLOAD_DB_FULL: {
233 disable_dbs(rnicp);
234 break;
235 }
236 case OFFLOAD_DB_EMPTY: {
237 enable_dbs(rnicp, 1);
238 break;
239 }
240 case OFFLOAD_DB_DROP: {
241 unsigned long delay = 1000;
242 unsigned short r;
243
244 disable_dbs(rnicp);
245 get_random_bytes(&r, 2);
246 delay += r & 1023;
247
248 /*
249 * delay is between 1000-2023 usecs.
250 */
251 schedule_delayed_work(&rnicp->db_drop_task,
252 usecs_to_jiffies(delay));
253 break;
254 }
255 }
256
257 if (dispatch) {
258 event.device = &rnicp->ibdev;
259 event.element.port_num = portnum;
260 ib_dispatch_event(&event);
261 }
262
263 return;
264 }
265
iwch_init_module(void)266 static int __init iwch_init_module(void)
267 {
268 int err;
269
270 err = cxio_hal_init();
271 if (err)
272 return err;
273 err = iwch_cm_init();
274 if (err)
275 return err;
276 cxio_register_ev_cb(iwch_ev_dispatch);
277 cxgb3_register_client(&t3c_client);
278 return 0;
279 }
280
iwch_exit_module(void)281 static void __exit iwch_exit_module(void)
282 {
283 cxgb3_unregister_client(&t3c_client);
284 cxio_unregister_ev_cb(iwch_ev_dispatch);
285 iwch_cm_term();
286 cxio_hal_exit();
287 }
288
289 module_init(iwch_init_module);
290 module_exit(iwch_exit_module);
291