1 // SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
2 /*
3 * Copyright(c) 2020 Intel Corporation.
4 *
5 */
6
7 /*
8 * This file contains HFI1 support for netdev RX functionality
9 */
10
11 #include "sdma.h"
12 #include "verbs.h"
13 #include "netdev.h"
14 #include "hfi.h"
15
16 #include <linux/netdevice.h>
17 #include <linux/etherdevice.h>
18 #include <rdma/ib_verbs.h>
19
hfi1_netdev_setup_ctxt(struct hfi1_netdev_rx * rx,struct hfi1_ctxtdata * uctxt)20 static int hfi1_netdev_setup_ctxt(struct hfi1_netdev_rx *rx,
21 struct hfi1_ctxtdata *uctxt)
22 {
23 unsigned int rcvctrl_ops;
24 struct hfi1_devdata *dd = rx->dd;
25 int ret;
26
27 uctxt->rhf_rcv_function_map = netdev_rhf_rcv_functions;
28 uctxt->do_interrupt = &handle_receive_interrupt_napi_sp;
29
30 /* Now allocate the RcvHdr queue and eager buffers. */
31 ret = hfi1_create_rcvhdrq(dd, uctxt);
32 if (ret)
33 goto done;
34
35 ret = hfi1_setup_eagerbufs(uctxt);
36 if (ret)
37 goto done;
38
39 clear_rcvhdrtail(uctxt);
40
41 rcvctrl_ops = HFI1_RCVCTRL_CTXT_DIS;
42 rcvctrl_ops |= HFI1_RCVCTRL_INTRAVAIL_DIS;
43
44 if (!HFI1_CAP_KGET_MASK(uctxt->flags, MULTI_PKT_EGR))
45 rcvctrl_ops |= HFI1_RCVCTRL_ONE_PKT_EGR_ENB;
46 if (HFI1_CAP_KGET_MASK(uctxt->flags, NODROP_EGR_FULL))
47 rcvctrl_ops |= HFI1_RCVCTRL_NO_EGR_DROP_ENB;
48 if (HFI1_CAP_KGET_MASK(uctxt->flags, NODROP_RHQ_FULL))
49 rcvctrl_ops |= HFI1_RCVCTRL_NO_RHQ_DROP_ENB;
50 if (HFI1_CAP_KGET_MASK(uctxt->flags, DMA_RTAIL))
51 rcvctrl_ops |= HFI1_RCVCTRL_TAILUPD_ENB;
52
53 hfi1_rcvctrl(uctxt->dd, rcvctrl_ops, uctxt);
54 done:
55 return ret;
56 }
57
hfi1_netdev_allocate_ctxt(struct hfi1_devdata * dd,struct hfi1_ctxtdata ** ctxt)58 static int hfi1_netdev_allocate_ctxt(struct hfi1_devdata *dd,
59 struct hfi1_ctxtdata **ctxt)
60 {
61 struct hfi1_ctxtdata *uctxt;
62 int ret;
63
64 if (dd->flags & HFI1_FROZEN)
65 return -EIO;
66
67 ret = hfi1_create_ctxtdata(dd->pport, dd->node, &uctxt);
68 if (ret < 0) {
69 dd_dev_err(dd, "Unable to create ctxtdata, failing open\n");
70 return -ENOMEM;
71 }
72
73 uctxt->flags = HFI1_CAP_KGET(MULTI_PKT_EGR) |
74 HFI1_CAP_KGET(NODROP_RHQ_FULL) |
75 HFI1_CAP_KGET(NODROP_EGR_FULL) |
76 HFI1_CAP_KGET(DMA_RTAIL);
77 /* Netdev contexts are always NO_RDMA_RTAIL */
78 uctxt->fast_handler = handle_receive_interrupt_napi_fp;
79 uctxt->slow_handler = handle_receive_interrupt_napi_sp;
80 hfi1_set_seq_cnt(uctxt, 1);
81 uctxt->is_vnic = true;
82
83 hfi1_stats.sps_ctxts++;
84
85 dd_dev_info(dd, "created netdev context %d\n", uctxt->ctxt);
86 *ctxt = uctxt;
87
88 return 0;
89 }
90
hfi1_netdev_deallocate_ctxt(struct hfi1_devdata * dd,struct hfi1_ctxtdata * uctxt)91 static void hfi1_netdev_deallocate_ctxt(struct hfi1_devdata *dd,
92 struct hfi1_ctxtdata *uctxt)
93 {
94 flush_wc();
95
96 /*
97 * Disable receive context and interrupt available, reset all
98 * RcvCtxtCtrl bits to default values.
99 */
100 hfi1_rcvctrl(dd, HFI1_RCVCTRL_CTXT_DIS |
101 HFI1_RCVCTRL_TIDFLOW_DIS |
102 HFI1_RCVCTRL_INTRAVAIL_DIS |
103 HFI1_RCVCTRL_ONE_PKT_EGR_DIS |
104 HFI1_RCVCTRL_NO_RHQ_DROP_DIS |
105 HFI1_RCVCTRL_NO_EGR_DROP_DIS, uctxt);
106
107 if (uctxt->msix_intr != CCE_NUM_MSIX_VECTORS)
108 msix_free_irq(dd, uctxt->msix_intr);
109
110 uctxt->msix_intr = CCE_NUM_MSIX_VECTORS;
111 uctxt->event_flags = 0;
112
113 hfi1_clear_tids(uctxt);
114 hfi1_clear_ctxt_pkey(dd, uctxt);
115
116 hfi1_stats.sps_ctxts--;
117
118 hfi1_free_ctxt(uctxt);
119 }
120
hfi1_netdev_allot_ctxt(struct hfi1_netdev_rx * rx,struct hfi1_ctxtdata ** ctxt)121 static int hfi1_netdev_allot_ctxt(struct hfi1_netdev_rx *rx,
122 struct hfi1_ctxtdata **ctxt)
123 {
124 int rc;
125 struct hfi1_devdata *dd = rx->dd;
126
127 rc = hfi1_netdev_allocate_ctxt(dd, ctxt);
128 if (rc) {
129 dd_dev_err(dd, "netdev ctxt alloc failed %d\n", rc);
130 return rc;
131 }
132
133 rc = hfi1_netdev_setup_ctxt(rx, *ctxt);
134 if (rc) {
135 dd_dev_err(dd, "netdev ctxt setup failed %d\n", rc);
136 hfi1_netdev_deallocate_ctxt(dd, *ctxt);
137 *ctxt = NULL;
138 }
139
140 return rc;
141 }
142
143 /**
144 * hfi1_num_netdev_contexts - Count of netdev recv contexts to use.
145 * @dd: device on which to allocate netdev contexts
146 * @available_contexts: count of available receive contexts
147 * @cpu_mask: mask of possible cpus to include for contexts
148 *
149 * Return: count of physical cores on a node or the remaining available recv
150 * contexts for netdev recv context usage up to the maximum of
151 * HFI1_MAX_NETDEV_CTXTS.
152 * A value of 0 can be returned when acceleration is explicitly turned off,
153 * a memory allocation error occurs or when there are no available contexts.
154 *
155 */
hfi1_num_netdev_contexts(struct hfi1_devdata * dd,u32 available_contexts,struct cpumask * cpu_mask)156 u32 hfi1_num_netdev_contexts(struct hfi1_devdata *dd, u32 available_contexts,
157 struct cpumask *cpu_mask)
158 {
159 cpumask_var_t node_cpu_mask;
160 unsigned int available_cpus;
161
162 if (!HFI1_CAP_IS_KSET(AIP))
163 return 0;
164
165 /* Always give user contexts priority over netdev contexts */
166 if (available_contexts == 0) {
167 dd_dev_info(dd, "No receive contexts available for netdevs.\n");
168 return 0;
169 }
170
171 if (!zalloc_cpumask_var(&node_cpu_mask, GFP_KERNEL)) {
172 dd_dev_err(dd, "Unable to allocate cpu_mask for netdevs.\n");
173 return 0;
174 }
175
176 cpumask_and(node_cpu_mask, cpu_mask, cpumask_of_node(dd->node));
177
178 available_cpus = cpumask_weight(node_cpu_mask);
179
180 free_cpumask_var(node_cpu_mask);
181
182 return min3(available_cpus, available_contexts,
183 (u32)HFI1_MAX_NETDEV_CTXTS);
184 }
185
hfi1_netdev_rxq_init(struct hfi1_netdev_rx * rx)186 static int hfi1_netdev_rxq_init(struct hfi1_netdev_rx *rx)
187 {
188 int i;
189 int rc;
190 struct hfi1_devdata *dd = rx->dd;
191 struct net_device *dev = rx->rx_napi;
192
193 rx->num_rx_q = dd->num_netdev_contexts;
194 rx->rxq = kcalloc_node(rx->num_rx_q, sizeof(*rx->rxq),
195 GFP_KERNEL, dd->node);
196
197 if (!rx->rxq) {
198 dd_dev_err(dd, "Unable to allocate netdev queue data\n");
199 return (-ENOMEM);
200 }
201
202 for (i = 0; i < rx->num_rx_q; i++) {
203 struct hfi1_netdev_rxq *rxq = &rx->rxq[i];
204
205 rc = hfi1_netdev_allot_ctxt(rx, &rxq->rcd);
206 if (rc)
207 goto bail_context_irq_failure;
208
209 hfi1_rcd_get(rxq->rcd);
210 rxq->rx = rx;
211 rxq->rcd->napi = &rxq->napi;
212 dd_dev_info(dd, "Setting rcv queue %d napi to context %d\n",
213 i, rxq->rcd->ctxt);
214 /*
215 * Disable BUSY_POLL on this NAPI as this is not supported
216 * right now.
217 */
218 set_bit(NAPI_STATE_NO_BUSY_POLL, &rxq->napi.state);
219 netif_napi_add(dev, &rxq->napi, hfi1_netdev_rx_napi);
220 rc = msix_netdev_request_rcd_irq(rxq->rcd);
221 if (rc)
222 goto bail_context_irq_failure;
223 }
224
225 return 0;
226
227 bail_context_irq_failure:
228 dd_dev_err(dd, "Unable to allot receive context\n");
229 for (; i >= 0; i--) {
230 struct hfi1_netdev_rxq *rxq = &rx->rxq[i];
231
232 if (rxq->rcd) {
233 hfi1_netdev_deallocate_ctxt(dd, rxq->rcd);
234 hfi1_rcd_put(rxq->rcd);
235 rxq->rcd = NULL;
236 }
237 }
238 kfree(rx->rxq);
239 rx->rxq = NULL;
240
241 return rc;
242 }
243
hfi1_netdev_rxq_deinit(struct hfi1_netdev_rx * rx)244 static void hfi1_netdev_rxq_deinit(struct hfi1_netdev_rx *rx)
245 {
246 int i;
247 struct hfi1_devdata *dd = rx->dd;
248
249 for (i = 0; i < rx->num_rx_q; i++) {
250 struct hfi1_netdev_rxq *rxq = &rx->rxq[i];
251
252 netif_napi_del(&rxq->napi);
253 hfi1_netdev_deallocate_ctxt(dd, rxq->rcd);
254 hfi1_rcd_put(rxq->rcd);
255 rxq->rcd = NULL;
256 }
257
258 kfree(rx->rxq);
259 rx->rxq = NULL;
260 rx->num_rx_q = 0;
261 }
262
enable_queues(struct hfi1_netdev_rx * rx)263 static void enable_queues(struct hfi1_netdev_rx *rx)
264 {
265 int i;
266
267 for (i = 0; i < rx->num_rx_q; i++) {
268 struct hfi1_netdev_rxq *rxq = &rx->rxq[i];
269
270 dd_dev_info(rx->dd, "enabling queue %d on context %d\n", i,
271 rxq->rcd->ctxt);
272 napi_enable(&rxq->napi);
273 hfi1_rcvctrl(rx->dd,
274 HFI1_RCVCTRL_CTXT_ENB | HFI1_RCVCTRL_INTRAVAIL_ENB,
275 rxq->rcd);
276 }
277 }
278
disable_queues(struct hfi1_netdev_rx * rx)279 static void disable_queues(struct hfi1_netdev_rx *rx)
280 {
281 int i;
282
283 msix_netdev_synchronize_irq(rx->dd);
284
285 for (i = 0; i < rx->num_rx_q; i++) {
286 struct hfi1_netdev_rxq *rxq = &rx->rxq[i];
287
288 dd_dev_info(rx->dd, "disabling queue %d on context %d\n", i,
289 rxq->rcd->ctxt);
290
291 /* wait for napi if it was scheduled */
292 hfi1_rcvctrl(rx->dd,
293 HFI1_RCVCTRL_CTXT_DIS | HFI1_RCVCTRL_INTRAVAIL_DIS,
294 rxq->rcd);
295 napi_synchronize(&rxq->napi);
296 napi_disable(&rxq->napi);
297 }
298 }
299
300 /**
301 * hfi1_netdev_rx_init - Incrememnts netdevs counter. When called first time,
302 * it allocates receive queue data and calls netif_napi_add
303 * for each queue.
304 *
305 * @dd: hfi1 dev data
306 */
hfi1_netdev_rx_init(struct hfi1_devdata * dd)307 int hfi1_netdev_rx_init(struct hfi1_devdata *dd)
308 {
309 struct hfi1_netdev_rx *rx = dd->netdev_rx;
310 int res;
311
312 if (atomic_fetch_inc(&rx->netdevs))
313 return 0;
314
315 mutex_lock(&hfi1_mutex);
316 res = hfi1_netdev_rxq_init(rx);
317 mutex_unlock(&hfi1_mutex);
318 return res;
319 }
320
321 /**
322 * hfi1_netdev_rx_destroy - Decrements netdevs counter, when it reaches 0
323 * napi is deleted and receive queses memory is freed.
324 *
325 * @dd: hfi1 dev data
326 */
hfi1_netdev_rx_destroy(struct hfi1_devdata * dd)327 int hfi1_netdev_rx_destroy(struct hfi1_devdata *dd)
328 {
329 struct hfi1_netdev_rx *rx = dd->netdev_rx;
330
331 /* destroy the RX queues only if it is the last netdev going away */
332 if (atomic_fetch_add_unless(&rx->netdevs, -1, 0) == 1) {
333 mutex_lock(&hfi1_mutex);
334 hfi1_netdev_rxq_deinit(rx);
335 mutex_unlock(&hfi1_mutex);
336 }
337
338 return 0;
339 }
340
341 /**
342 * hfi1_alloc_rx - Allocates the rx support structure
343 * @dd: hfi1 dev data
344 *
345 * Allocate the rx structure to support gathering the receive
346 * resources and the dummy netdev.
347 *
348 * Updates dd struct pointer upon success.
349 *
350 * Return: 0 (success) -error on failure
351 *
352 */
hfi1_alloc_rx(struct hfi1_devdata * dd)353 int hfi1_alloc_rx(struct hfi1_devdata *dd)
354 {
355 struct hfi1_netdev_rx *rx;
356
357 dd_dev_info(dd, "allocating rx size %ld\n", sizeof(*rx));
358 rx = kzalloc_node(sizeof(*rx), GFP_KERNEL, dd->node);
359
360 if (!rx)
361 return -ENOMEM;
362 rx->dd = dd;
363 rx->rx_napi = alloc_netdev_dummy(0);
364 if (!rx->rx_napi) {
365 kfree(rx);
366 return -ENOMEM;
367 }
368
369 xa_init(&rx->dev_tbl);
370 atomic_set(&rx->enabled, 0);
371 atomic_set(&rx->netdevs, 0);
372 dd->netdev_rx = rx;
373
374 return 0;
375 }
376
hfi1_free_rx(struct hfi1_devdata * dd)377 void hfi1_free_rx(struct hfi1_devdata *dd)
378 {
379 if (dd->netdev_rx) {
380 dd_dev_info(dd, "hfi1 rx freed\n");
381 free_netdev(dd->netdev_rx->rx_napi);
382 kfree(dd->netdev_rx);
383 dd->netdev_rx = NULL;
384 }
385 }
386
387 /**
388 * hfi1_netdev_enable_queues - This is napi enable function.
389 * It enables napi objects associated with queues.
390 * When at least one device has called it it increments atomic counter.
391 * Disable function decrements counter and when it is 0,
392 * calls napi_disable for every queue.
393 *
394 * @dd: hfi1 dev data
395 */
hfi1_netdev_enable_queues(struct hfi1_devdata * dd)396 void hfi1_netdev_enable_queues(struct hfi1_devdata *dd)
397 {
398 struct hfi1_netdev_rx *rx;
399
400 if (!dd->netdev_rx)
401 return;
402
403 rx = dd->netdev_rx;
404 if (atomic_fetch_inc(&rx->enabled))
405 return;
406
407 mutex_lock(&hfi1_mutex);
408 enable_queues(rx);
409 mutex_unlock(&hfi1_mutex);
410 }
411
hfi1_netdev_disable_queues(struct hfi1_devdata * dd)412 void hfi1_netdev_disable_queues(struct hfi1_devdata *dd)
413 {
414 struct hfi1_netdev_rx *rx;
415
416 if (!dd->netdev_rx)
417 return;
418
419 rx = dd->netdev_rx;
420 if (atomic_dec_if_positive(&rx->enabled))
421 return;
422
423 mutex_lock(&hfi1_mutex);
424 disable_queues(rx);
425 mutex_unlock(&hfi1_mutex);
426 }
427
428 /**
429 * hfi1_netdev_add_data - Registers data with unique identifier
430 * to be requested later this is needed for VNIC and IPoIB VLANs
431 * implementations.
432 * This call is protected by mutex idr_lock.
433 *
434 * @dd: hfi1 dev data
435 * @id: requested integer id up to INT_MAX
436 * @data: data to be associated with index
437 */
hfi1_netdev_add_data(struct hfi1_devdata * dd,int id,void * data)438 int hfi1_netdev_add_data(struct hfi1_devdata *dd, int id, void *data)
439 {
440 struct hfi1_netdev_rx *rx = dd->netdev_rx;
441
442 return xa_insert(&rx->dev_tbl, id, data, GFP_NOWAIT);
443 }
444
445 /**
446 * hfi1_netdev_remove_data - Removes data with previously given id.
447 * Returns the reference to removed entry.
448 *
449 * @dd: hfi1 dev data
450 * @id: requested integer id up to INT_MAX
451 */
hfi1_netdev_remove_data(struct hfi1_devdata * dd,int id)452 void *hfi1_netdev_remove_data(struct hfi1_devdata *dd, int id)
453 {
454 struct hfi1_netdev_rx *rx = dd->netdev_rx;
455
456 return xa_erase(&rx->dev_tbl, id);
457 }
458
459 /**
460 * hfi1_netdev_get_data - Gets data with given id
461 *
462 * @dd: hfi1 dev data
463 * @id: requested integer id up to INT_MAX
464 */
hfi1_netdev_get_data(struct hfi1_devdata * dd,int id)465 void *hfi1_netdev_get_data(struct hfi1_devdata *dd, int id)
466 {
467 struct hfi1_netdev_rx *rx = dd->netdev_rx;
468
469 return xa_load(&rx->dev_tbl, id);
470 }
471
472 /**
473 * hfi1_netdev_get_first_data - Gets first entry with greater or equal id.
474 *
475 * @dd: hfi1 dev data
476 * @start_id: requested integer id up to INT_MAX
477 */
hfi1_netdev_get_first_data(struct hfi1_devdata * dd,int * start_id)478 void *hfi1_netdev_get_first_data(struct hfi1_devdata *dd, int *start_id)
479 {
480 struct hfi1_netdev_rx *rx = dd->netdev_rx;
481 unsigned long index = *start_id;
482 void *ret;
483
484 ret = xa_find(&rx->dev_tbl, &index, UINT_MAX, XA_PRESENT);
485 *start_id = (int)index;
486 return ret;
487 }
488