1/*
2 * Copyright 2014 Cisco Systems, Inc.  All rights reserved.
3 *
4 * This program is free software; you may redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; version 2 of the License.
7 *
8 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
9 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
10 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
11 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
12 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
13 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
14 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
15 * SOFTWARE.
16 */
17
18#include <linux/errno.h>
19#include <linux/types.h>
20#include <linux/pci.h>
21
22#include "wq_enet_desc.h"
23#include "cq_enet_desc.h"
24#include "vnic_resource.h"
25#include "vnic_dev.h"
26#include "vnic_wq.h"
27#include "vnic_cq.h"
28#include "vnic_intr.h"
29#include "vnic_stats.h"
30#include "snic.h"
31
32int
33snic_get_vnic_config(struct snic *snic)
34{
35	struct vnic_snic_config *c = &snic->config;
36	int ret;
37
38#define GET_CONFIG(m) \
39	do { \
40		ret = svnic_dev_spec(snic->vdev, \
41				     offsetof(struct vnic_snic_config, m), \
42				     sizeof(c->m), \
43				     &c->m); \
44		if (ret) { \
45			SNIC_HOST_ERR(snic->shost, \
46				      "Error getting %s, %d\n", #m, ret); \
47			return ret; \
48		} \
49	} while (0)
50
51	GET_CONFIG(wq_enet_desc_count);
52	GET_CONFIG(maxdatafieldsize);
53	GET_CONFIG(intr_timer);
54	GET_CONFIG(intr_timer_type);
55	GET_CONFIG(flags);
56	GET_CONFIG(io_throttle_count);
57	GET_CONFIG(port_down_timeout);
58	GET_CONFIG(port_down_io_retries);
59	GET_CONFIG(luns_per_tgt);
60	GET_CONFIG(xpt_type);
61	GET_CONFIG(hid);
62
63	c->wq_enet_desc_count = min_t(u32,
64				      VNIC_SNIC_WQ_DESCS_MAX,
65				      max_t(u32,
66					    VNIC_SNIC_WQ_DESCS_MIN,
67					    c->wq_enet_desc_count));
68
69	c->wq_enet_desc_count = ALIGN(c->wq_enet_desc_count, 16);
70
71	c->maxdatafieldsize = min_t(u32,
72				    VNIC_SNIC_MAXDATAFIELDSIZE_MAX,
73				    max_t(u32,
74					  VNIC_SNIC_MAXDATAFIELDSIZE_MIN,
75					  c->maxdatafieldsize));
76
77	c->io_throttle_count = min_t(u32,
78				     VNIC_SNIC_IO_THROTTLE_COUNT_MAX,
79				     max_t(u32,
80					   VNIC_SNIC_IO_THROTTLE_COUNT_MIN,
81					   c->io_throttle_count));
82
83	c->port_down_timeout = min_t(u32,
84				     VNIC_SNIC_PORT_DOWN_TIMEOUT_MAX,
85				     c->port_down_timeout);
86
87	c->port_down_io_retries = min_t(u32,
88				     VNIC_SNIC_PORT_DOWN_IO_RETRIES_MAX,
89				     c->port_down_io_retries);
90
91	c->luns_per_tgt = min_t(u32,
92				VNIC_SNIC_LUNS_PER_TARGET_MAX,
93				max_t(u32,
94				      VNIC_SNIC_LUNS_PER_TARGET_MIN,
95				      c->luns_per_tgt));
96
97	c->intr_timer = min_t(u32, VNIC_INTR_TIMER_MAX, c->intr_timer);
98
99	SNIC_INFO("vNIC resources wq %d\n", c->wq_enet_desc_count);
100	SNIC_INFO("vNIC mtu %d intr timer %d\n",
101		  c->maxdatafieldsize,
102		  c->intr_timer);
103
104	SNIC_INFO("vNIC flags 0x%x luns per tgt %d\n",
105		  c->flags,
106		  c->luns_per_tgt);
107
108	SNIC_INFO("vNIC io throttle count %d\n", c->io_throttle_count);
109	SNIC_INFO("vNIC port down timeout %d port down io retries %d\n",
110		  c->port_down_timeout,
111		  c->port_down_io_retries);
112
113	SNIC_INFO("vNIC back end type = %d\n", c->xpt_type);
114	SNIC_INFO("vNIC hid = %d\n", c->hid);
115
116	return 0;
117}
118
119void
120snic_get_res_counts(struct snic *snic)
121{
122	snic->wq_count = svnic_dev_get_res_count(snic->vdev, RES_TYPE_WQ);
123	SNIC_BUG_ON(snic->wq_count == 0);
124	snic->cq_count = svnic_dev_get_res_count(snic->vdev, RES_TYPE_CQ);
125	SNIC_BUG_ON(snic->cq_count == 0);
126	snic->intr_count = svnic_dev_get_res_count(snic->vdev,
127						  RES_TYPE_INTR_CTRL);
128	SNIC_BUG_ON(snic->intr_count == 0);
129}
130
131void
132snic_free_vnic_res(struct snic *snic)
133{
134	unsigned int i;
135
136	for (i = 0; i < snic->wq_count; i++)
137		svnic_wq_free(&snic->wq[i]);
138
139	for (i = 0; i < snic->cq_count; i++)
140		svnic_cq_free(&snic->cq[i]);
141
142	for (i = 0; i < snic->intr_count; i++)
143		svnic_intr_free(&snic->intr[i]);
144}
145
146int
147snic_alloc_vnic_res(struct snic *snic)
148{
149	enum vnic_dev_intr_mode intr_mode;
150	unsigned int mask_on_assertion;
151	unsigned int intr_offset;
152	unsigned int err_intr_enable;
153	unsigned int err_intr_offset;
154	unsigned int i;
155	int ret;
156
157	intr_mode = svnic_dev_get_intr_mode(snic->vdev);
158
159	SNIC_INFO("vNIC interrupt mode: %s\n",
160		  ((intr_mode == VNIC_DEV_INTR_MODE_INTX) ?
161		   "Legacy PCI INTx" :
162		   ((intr_mode == VNIC_DEV_INTR_MODE_MSI) ?
163		    "MSI" :
164		    ((intr_mode == VNIC_DEV_INTR_MODE_MSIX) ?
165		     "MSI-X" : "Unknown"))));
166
167	/* only MSI-X is supported */
168	SNIC_BUG_ON(intr_mode != VNIC_DEV_INTR_MODE_MSIX);
169
170	SNIC_INFO("wq %d cq %d intr %d\n", snic->wq_count,
171		  snic->cq_count,
172		  snic->intr_count);
173
174
175	/* Allocate WQs used for SCSI IOs */
176	for (i = 0; i < snic->wq_count; i++) {
177		ret = svnic_wq_alloc(snic->vdev,
178				     &snic->wq[i],
179				     i,
180				     snic->config.wq_enet_desc_count,
181				     sizeof(struct wq_enet_desc));
182		if (ret)
183			goto error_cleanup;
184	}
185
186	/* CQ for each WQ */
187	for (i = 0; i < snic->wq_count; i++) {
188		ret = svnic_cq_alloc(snic->vdev,
189				     &snic->cq[i],
190				     i,
191				     snic->config.wq_enet_desc_count,
192				     sizeof(struct cq_enet_wq_desc));
193		if (ret)
194			goto error_cleanup;
195	}
196
197	SNIC_BUG_ON(snic->cq_count != 2 * snic->wq_count);
198	/* CQ for FW TO host */
199	for (i = snic->wq_count; i < snic->cq_count; i++) {
200		ret = svnic_cq_alloc(snic->vdev,
201				     &snic->cq[i],
202				     i,
203				     (snic->config.wq_enet_desc_count * 3),
204				     sizeof(struct snic_fw_req));
205		if (ret)
206			goto error_cleanup;
207	}
208
209	for (i = 0; i < snic->intr_count; i++) {
210		ret = svnic_intr_alloc(snic->vdev, &snic->intr[i], i);
211		if (ret)
212			goto error_cleanup;
213	}
214
215	/*
216	 * Init WQ Resources.
217	 * WQ[0 to n] points to CQ[0 to n-1]
218	 * firmware to host comm points to CQ[n to m+1]
219	 */
220	err_intr_enable = 1;
221	err_intr_offset = snic->err_intr_offset;
222
223	for (i = 0; i < snic->wq_count; i++) {
224		svnic_wq_init(&snic->wq[i],
225			      i,
226			      err_intr_enable,
227			      err_intr_offset);
228	}
229
230	for (i = 0; i < snic->cq_count; i++) {
231		intr_offset = i;
232
233		svnic_cq_init(&snic->cq[i],
234			      0 /* flow_control_enable */,
235			      1 /* color_enable */,
236			      0 /* cq_head */,
237			      0 /* cq_tail */,
238			      1 /* cq_tail_color */,
239			      1 /* interrupt_enable */,
240			      1 /* cq_entry_enable */,
241			      0 /* cq_message_enable */,
242			      intr_offset,
243			      0 /* cq_message_addr */);
244	}
245
246	/*
247	 * Init INTR resources
248	 * Assumption : snic is always in MSI-X mode
249	 */
250	SNIC_BUG_ON(intr_mode != VNIC_DEV_INTR_MODE_MSIX);
251	mask_on_assertion = 1;
252
253	for (i = 0; i < snic->intr_count; i++) {
254		svnic_intr_init(&snic->intr[i],
255				snic->config.intr_timer,
256				snic->config.intr_timer_type,
257				mask_on_assertion);
258	}
259
260	/* init the stats memory by making the first call here */
261	ret = svnic_dev_stats_dump(snic->vdev, &snic->stats);
262	if (ret) {
263		SNIC_HOST_ERR(snic->shost,
264			      "svnic_dev_stats_dump failed - x%x\n",
265			      ret);
266		goto error_cleanup;
267	}
268
269	/* Clear LIF stats */
270	svnic_dev_stats_clear(snic->vdev);
271	ret = 0;
272
273	return ret;
274
275error_cleanup:
276	snic_free_vnic_res(snic);
277
278	return ret;
279}
280
281void
282snic_log_q_error(struct snic *snic)
283{
284	unsigned int i;
285	u32 err_status;
286
287	for (i = 0; i < snic->wq_count; i++) {
288		err_status = ioread32(&snic->wq[i].ctrl->error_status);
289		if (err_status)
290			SNIC_HOST_ERR(snic->shost,
291				      "WQ[%d] error status %d\n",
292				      i,
293				      err_status);
294	}
295} /* end of snic_log_q_error */
296