summaryrefslogtreecommitdiff
path: root/drivers/net/ethernet/huawei/hinic/hinic_tx.c
blob: 9128858479c4a031baa4b6b93b47d7097f01a995 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
/*
 * Huawei HiNIC PCI Express Linux driver
 * Copyright(c) 2017 Huawei Technologies Co., Ltd
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms and conditions of the GNU General Public License,
 * version 2, as published by the Free Software Foundation.
 *
 * This program is distributed in the hope it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * for more details.
 *
 */

#include <linux/kernel.h>
#include <linux/netdevice.h>
#include <linux/u64_stats_sync.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/device.h>
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/interrupt.h>
#include <linux/skbuff.h>
#include <linux/smp.h>
#include <asm/byteorder.h>

#include "hinic_common.h"
#include "hinic_hw_if.h"
#include "hinic_hw_wqe.h"
#include "hinic_hw_wq.h"
#include "hinic_hw_qp.h"
#include "hinic_hw_dev.h"
#include "hinic_dev.h"
#include "hinic_tx.h"

#define TX_IRQ_NO_PENDING               0
#define TX_IRQ_NO_COALESC               0
#define TX_IRQ_NO_LLI_TIMER             0
#define TX_IRQ_NO_CREDIT                0
#define TX_IRQ_NO_RESEND_TIMER          0

#define CI_UPDATE_NO_PENDING            0
#define CI_UPDATE_NO_COALESC            0

#define HW_CONS_IDX(sq)         be16_to_cpu(*(u16 *)((sq)->hw_ci_addr))

#define MIN_SKB_LEN             64

/**
 * hinic_txq_clean_stats - Clean the statistics of specific queue
 * @txq: Logical Tx Queue
 **/
void hinic_txq_clean_stats(struct hinic_txq *txq)
{
	struct hinic_txq_stats *txq_stats = &txq->txq_stats;

	u64_stats_update_begin(&txq_stats->syncp);
	txq_stats->pkts    = 0;
	txq_stats->bytes   = 0;
	txq_stats->tx_busy = 0;
	txq_stats->tx_wake = 0;
	txq_stats->tx_dropped = 0;
	u64_stats_update_end(&txq_stats->syncp);
}

/**
 * hinic_txq_get_stats - get statistics of Tx Queue
 * @txq: Logical Tx Queue
 * @stats: return updated stats here
 **/
void hinic_txq_get_stats(struct hinic_txq *txq, struct hinic_txq_stats *stats)
{
	struct hinic_txq_stats *txq_stats = &txq->txq_stats;
	unsigned int start;

	u64_stats_update_begin(&stats->syncp);
	do {
		start = u64_stats_fetch_begin(&txq_stats->syncp);
		stats->pkts    = txq_stats->pkts;
		stats->bytes   = txq_stats->bytes;
		stats->tx_busy = txq_stats->tx_busy;
		stats->tx_wake = txq_stats->tx_wake;
		stats->tx_dropped = txq_stats->tx_dropped;
	} while (u64_stats_fetch_retry(&txq_stats->syncp, start));
	u64_stats_update_end(&stats->syncp);
}

/**
 * txq_stats_init - Initialize the statistics of specific queue
 * @txq: Logical Tx Queue
 **/
static void txq_stats_init(struct hinic_txq *txq)
{
	struct hinic_txq_stats *txq_stats = &txq->txq_stats;

	u64_stats_init(&txq_stats->syncp);
	hinic_txq_clean_stats(txq);
}

/**
 * tx_map_skb - dma mapping for skb and return sges
 * @nic_dev: nic device
 * @skb: the skb
 * @sges: returned sges
 *
 * Return 0 - Success, negative - Failure
 **/
static int tx_map_skb(struct hinic_dev *nic_dev, struct sk_buff *skb,
		      struct hinic_sge *sges)
{
	struct hinic_hwdev *hwdev = nic_dev->hwdev;
	struct hinic_hwif *hwif = hwdev->hwif;
	struct pci_dev *pdev = hwif->pdev;
	struct skb_frag_struct *frag;
	dma_addr_t dma_addr;
	int i, j;

	dma_addr = dma_map_single(&pdev->dev, skb->data, skb_headlen(skb),
				  DMA_TO_DEVICE);
	if (dma_mapping_error(&pdev->dev, dma_addr)) {
		dev_err(&pdev->dev, "Failed to map Tx skb data\n");
		return -EFAULT;
	}

	hinic_set_sge(&sges[0], dma_addr, skb_headlen(skb));

	for (i = 0 ; i < skb_shinfo(skb)->nr_frags; i++) {
		frag = &skb_shinfo(skb)->frags[i];

		dma_addr = skb_frag_dma_map(&pdev->dev, frag, 0,
					    skb_frag_size(frag),
					    DMA_TO_DEVICE);
		if (dma_mapping_error(&pdev->dev, dma_addr)) {
			dev_err(&pdev->dev, "Failed to map Tx skb frag\n");
			goto err_tx_map;
		}

		hinic_set_sge(&sges[i + 1], dma_addr, skb_frag_size(frag));
	}

	return 0;

err_tx_map:
	for (j = 0; j < i; j++)
		dma_unmap_page(&pdev->dev, hinic_sge_to_dma(&sges[j + 1]),
			       sges[j + 1].len, DMA_TO_DEVICE);

	dma_unmap_single(&pdev->dev, hinic_sge_to_dma(&sges[0]), sges[0].len,
			 DMA_TO_DEVICE);
	return -EFAULT;
}

/**
 * tx_unmap_skb - unmap the dma address of the skb
 * @nic_dev: nic device
 * @skb: the skb
 * @sges: the sges that are connected to the skb
 **/
static void tx_unmap_skb(struct hinic_dev *nic_dev, struct sk_buff *skb,
			 struct hinic_sge *sges)
{
	struct hinic_hwdev *hwdev = nic_dev->hwdev;
	struct hinic_hwif *hwif = hwdev->hwif;
	struct pci_dev *pdev = hwif->pdev;
	int i;

	for (i = 0; i < skb_shinfo(skb)->nr_frags ; i++)
		dma_unmap_page(&pdev->dev, hinic_sge_to_dma(&sges[i + 1]),
			       sges[i + 1].len, DMA_TO_DEVICE);

	dma_unmap_single(&pdev->dev, hinic_sge_to_dma(&sges[0]), sges[0].len,
			 DMA_TO_DEVICE);
}

netdev_tx_t hinic_xmit_frame(struct sk_buff *skb, struct net_device *netdev)
{
	struct hinic_dev *nic_dev = netdev_priv(netdev);
	struct netdev_queue *netdev_txq;
	int nr_sges, err = NETDEV_TX_OK;
	struct hinic_sq_wqe *sq_wqe;
	unsigned int wqe_size;
	struct hinic_txq *txq;
	struct hinic_qp *qp;
	u16 prod_idx;

	txq = &nic_dev->txqs[skb->queue_mapping];
	qp = container_of(txq->sq, struct hinic_qp, sq);

	if (skb->len < MIN_SKB_LEN) {
		if (skb_pad(skb, MIN_SKB_LEN - skb->len)) {
			netdev_err(netdev, "Failed to pad skb\n");
			goto update_error_stats;
		}

		skb->len = MIN_SKB_LEN;
	}

	nr_sges = skb_shinfo(skb)->nr_frags + 1;
	if (nr_sges > txq->max_sges) {
		netdev_err(netdev, "Too many Tx sges\n");
		goto skb_error;
	}

	err = tx_map_skb(nic_dev, skb, txq->sges);
	if (err)
		goto skb_error;

	wqe_size = HINIC_SQ_WQE_SIZE(nr_sges);

	sq_wqe = hinic_sq_get_wqe(txq->sq, wqe_size, &prod_idx);
	if (!sq_wqe) {
		netif_stop_subqueue(netdev, qp->q_id);

		/* Check for the case free_tx_poll is called in another cpu
		 * and we stopped the subqueue after free_tx_poll check.
		 */
		sq_wqe = hinic_sq_get_wqe(txq->sq, wqe_size, &prod_idx);
		if (sq_wqe) {
			netif_wake_subqueue(nic_dev->netdev, qp->q_id);
			goto process_sq_wqe;
		}

		tx_unmap_skb(nic_dev, skb, txq->sges);

		u64_stats_update_begin(&txq->txq_stats.syncp);
		txq->txq_stats.tx_busy++;
		u64_stats_update_end(&txq->txq_stats.syncp);
		err = NETDEV_TX_BUSY;
		goto flush_skbs;
	}

process_sq_wqe:
	hinic_sq_prepare_wqe(txq->sq, prod_idx, sq_wqe, txq->sges, nr_sges);

	hinic_sq_write_wqe(txq->sq, prod_idx, sq_wqe, skb, wqe_size);

flush_skbs:
	netdev_txq = netdev_get_tx_queue(netdev, skb->queue_mapping);
	if ((!skb->xmit_more) || (netif_xmit_stopped(netdev_txq)))
		hinic_sq_write_db(txq->sq, prod_idx, wqe_size, 0);

	return err;

skb_error:
	dev_kfree_skb_any(skb);

update_error_stats:
	u64_stats_update_begin(&txq->txq_stats.syncp);
	txq->txq_stats.tx_dropped++;
	u64_stats_update_end(&txq->txq_stats.syncp);
	return err;
}

/**
 * tx_free_skb - unmap and free skb
 * @nic_dev: nic device
 * @skb: the skb
 * @sges: the sges that are connected to the skb
 **/
static void tx_free_skb(struct hinic_dev *nic_dev, struct sk_buff *skb,
			struct hinic_sge *sges)
{
	tx_unmap_skb(nic_dev, skb, sges);

	dev_kfree_skb_any(skb);
}

/**
 * free_all_rx_skbs - free all skbs in tx queue
 * @txq: tx queue
 **/
static void free_all_tx_skbs(struct hinic_txq *txq)
{
	struct hinic_dev *nic_dev = netdev_priv(txq->netdev);
	struct hinic_sq *sq = txq->sq;
	struct hinic_sq_wqe *sq_wqe;
	unsigned int wqe_size;
	struct sk_buff *skb;
	int nr_sges;
	u16 ci;

	while ((sq_wqe = hinic_sq_read_wqe(sq, &skb, &wqe_size, &ci))) {
		nr_sges = skb_shinfo(skb)->nr_frags + 1;

		hinic_sq_get_sges(sq_wqe, txq->free_sges, nr_sges);

		hinic_sq_put_wqe(sq, wqe_size);

		tx_free_skb(nic_dev, skb, txq->free_sges);
	}
}

/**
 * free_tx_poll - free finished tx skbs in tx queue that connected to napi
 * @napi: napi
 * @budget: number of tx
 *
 * Return 0 - Success, negative - Failure
 **/
static int free_tx_poll(struct napi_struct *napi, int budget)
{
	struct hinic_txq *txq = container_of(napi, struct hinic_txq, napi);
	struct hinic_qp *qp = container_of(txq->sq, struct hinic_qp, sq);
	struct hinic_dev *nic_dev = netdev_priv(txq->netdev);
	struct netdev_queue *netdev_txq;
	struct hinic_sq *sq = txq->sq;
	struct hinic_wq *wq = sq->wq;
	struct hinic_sq_wqe *sq_wqe;
	unsigned int wqe_size;
	int nr_sges, pkts = 0;
	struct sk_buff *skb;
	u64 tx_bytes = 0;
	u16 hw_ci, sw_ci;

	do {
		hw_ci = HW_CONS_IDX(sq) & wq->mask;

		sq_wqe = hinic_sq_read_wqe(sq, &skb, &wqe_size, &sw_ci);
		if ((!sq_wqe) ||
		    (((hw_ci - sw_ci) & wq->mask) * wq->wqebb_size < wqe_size))
			break;

		tx_bytes += skb->len;
		pkts++;

		nr_sges = skb_shinfo(skb)->nr_frags + 1;

		hinic_sq_get_sges(sq_wqe, txq->free_sges, nr_sges);

		hinic_sq_put_wqe(sq, wqe_size);

		tx_free_skb(nic_dev, skb, txq->free_sges);
	} while (pkts < budget);

	if (__netif_subqueue_stopped(nic_dev->netdev, qp->q_id) &&
	    hinic_get_sq_free_wqebbs(sq) >= HINIC_MIN_TX_NUM_WQEBBS(sq)) {
		netdev_txq = netdev_get_tx_queue(txq->netdev, qp->q_id);

		__netif_tx_lock(netdev_txq, smp_processor_id());

		netif_wake_subqueue(nic_dev->netdev, qp->q_id);

		__netif_tx_unlock(netdev_txq);

		u64_stats_update_begin(&txq->txq_stats.syncp);
		txq->txq_stats.tx_wake++;
		u64_stats_update_end(&txq->txq_stats.syncp);
	}

	u64_stats_update_begin(&txq->txq_stats.syncp);
	txq->txq_stats.bytes += tx_bytes;
	txq->txq_stats.pkts += pkts;
	u64_stats_update_end(&txq->txq_stats.syncp);

	if (pkts < budget) {
		napi_complete(napi);
		enable_irq(sq->irq);
		return pkts;
	}

	return budget;
}

static void tx_napi_add(struct hinic_txq *txq, int weight)
{
	netif_napi_add(txq->netdev, &txq->napi, free_tx_poll, weight);
	napi_enable(&txq->napi);
}

static void tx_napi_del(struct hinic_txq *txq)
{
	napi_disable(&txq->napi);
	netif_napi_del(&txq->napi);
}

static irqreturn_t tx_irq(int irq, void *data)
{
	struct hinic_txq *txq = data;
	struct hinic_dev *nic_dev;

	nic_dev = netdev_priv(txq->netdev);

	/* Disable the interrupt until napi will be completed */
	disable_irq_nosync(txq->sq->irq);

	hinic_hwdev_msix_cnt_set(nic_dev->hwdev, txq->sq->msix_entry);

	napi_schedule(&txq->napi);
	return IRQ_HANDLED;
}

static int tx_request_irq(struct hinic_txq *txq)
{
	struct hinic_dev *nic_dev = netdev_priv(txq->netdev);
	struct hinic_hwdev *hwdev = nic_dev->hwdev;
	struct hinic_hwif *hwif = hwdev->hwif;
	struct pci_dev *pdev = hwif->pdev;
	struct hinic_sq *sq = txq->sq;
	int err;

	tx_napi_add(txq, nic_dev->tx_weight);

	hinic_hwdev_msix_set(nic_dev->hwdev, sq->msix_entry,
			     TX_IRQ_NO_PENDING, TX_IRQ_NO_COALESC,
			     TX_IRQ_NO_LLI_TIMER, TX_IRQ_NO_CREDIT,
			     TX_IRQ_NO_RESEND_TIMER);

	err = request_irq(sq->irq, tx_irq, 0, txq->irq_name, txq);
	if (err) {
		dev_err(&pdev->dev, "Failed to request Tx irq\n");
		tx_napi_del(txq);
		return err;
	}

	return 0;
}

static void tx_free_irq(struct hinic_txq *txq)
{
	struct hinic_sq *sq = txq->sq;

	free_irq(sq->irq, txq);
	tx_napi_del(txq);
}

/**
 * hinic_init_txq - Initialize the Tx Queue
 * @txq: Logical Tx Queue
 * @sq: Hardware Tx Queue to connect the Logical queue with
 * @netdev: network device to connect the Logical queue with
 *
 * Return 0 - Success, negative - Failure
 **/
int hinic_init_txq(struct hinic_txq *txq, struct hinic_sq *sq,
		   struct net_device *netdev)
{
	struct hinic_qp *qp = container_of(sq, struct hinic_qp, sq);
	struct hinic_dev *nic_dev = netdev_priv(netdev);
	struct hinic_hwdev *hwdev = nic_dev->hwdev;
	int err, irqname_len;
	size_t sges_size;

	txq->netdev = netdev;
	txq->sq = sq;

	txq_stats_init(txq);

	txq->max_sges = HINIC_MAX_SQ_BUFDESCS;

	sges_size = txq->max_sges * sizeof(*txq->sges);
	txq->sges = devm_kzalloc(&netdev->dev, sges_size, GFP_KERNEL);
	if (!txq->sges)
		return -ENOMEM;

	sges_size = txq->max_sges * sizeof(*txq->free_sges);
	txq->free_sges = devm_kzalloc(&netdev->dev, sges_size, GFP_KERNEL);
	if (!txq->free_sges) {
		err = -ENOMEM;
		goto err_alloc_free_sges;
	}

	irqname_len = snprintf(NULL, 0, "hinic_txq%d", qp->q_id) + 1;
	txq->irq_name = devm_kzalloc(&netdev->dev, irqname_len, GFP_KERNEL);
	if (!txq->irq_name) {
		err = -ENOMEM;
		goto err_alloc_irqname;
	}

	sprintf(txq->irq_name, "hinic_txq%d", qp->q_id);

	err = hinic_hwdev_hw_ci_addr_set(hwdev, sq, CI_UPDATE_NO_PENDING,
					 CI_UPDATE_NO_COALESC);
	if (err)
		goto err_hw_ci;

	err = tx_request_irq(txq);
	if (err) {
		netdev_err(netdev, "Failed to request Tx irq\n");
		goto err_req_tx_irq;
	}

	return 0;

err_req_tx_irq:
err_hw_ci:
	devm_kfree(&netdev->dev, txq->irq_name);

err_alloc_irqname:
	devm_kfree(&netdev->dev, txq->free_sges);

err_alloc_free_sges:
	devm_kfree(&netdev->dev, txq->sges);
	return err;
}

/**
 * hinic_clean_txq - Clean the Tx Queue
 * @txq: Logical Tx Queue
 **/
void hinic_clean_txq(struct hinic_txq *txq)
{
	struct net_device *netdev = txq->netdev;

	tx_free_irq(txq);

	free_all_tx_skbs(txq);

	devm_kfree(&netdev->dev, txq->irq_name);
	devm_kfree(&netdev->dev, txq->free_sges);
	devm_kfree(&netdev->dev, txq->sges);
}