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tcp: don't use timestamp from repaired skb-s to calculate RTT (v2)
[linux-2.6-block.git] / drivers / net / ethernet / apm / xgene / xgene_enet_main.c
CommitLineData
e6ad7673
IS		 1/* Applied Micro X-Gene SoC Ethernet Driver
2 *
3 * Copyright (c) 2014, Applied Micro Circuits Corporation
4 * Authors: Iyappan Subramanian <isubramanian@apm.com>
5 * Ravi Patel <rapatel@apm.com>
6 * Keyur Chudgar <kchudgar@apm.com>
7 *
8 * This program is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License as published by the
10 * Free Software Foundation; either version 2 of the License, or (at your
11 * option) any later version.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
20 */
21
22#include "xgene_enet_main.h"
23#include "xgene_enet_hw.h"
24
25static void xgene_enet_init_bufpool(struct xgene_enet_desc_ring *buf_pool)
26{
27 struct xgene_enet_raw_desc16 *raw_desc;
28 int i;
29
30 for (i = 0; i < buf_pool->slots; i++) {
31 raw_desc = &buf_pool->raw_desc16[i];
32
33 /* Hardware expects descriptor in little endian format */
34 raw_desc->m0 = cpu_to_le64(i |
35 SET_VAL(FPQNUM, buf_pool->dst_ring_num) |
36 SET_VAL(STASH, 3));
37 }
38}
39
40static int xgene_enet_refill_bufpool(struct xgene_enet_desc_ring *buf_pool,
41 u32 nbuf)
42{
43 struct sk_buff *skb;
44 struct xgene_enet_raw_desc16 *raw_desc;
45 struct net_device *ndev;
46 struct device *dev;
47 dma_addr_t dma_addr;
48 u32 tail = buf_pool->tail;
49 u32 slots = buf_pool->slots - 1;
50 u16 bufdatalen, len;
51 int i;
52
53 ndev = buf_pool->ndev;
54 dev = ndev_to_dev(buf_pool->ndev);
55 bufdatalen = BUF_LEN_CODE_2K | (SKB_BUFFER_SIZE & GENMASK(11, 0));
56 len = XGENE_ENET_MAX_MTU;
57
58 for (i = 0; i < nbuf; i++) {
59 raw_desc = &buf_pool->raw_desc16[tail];
60
61 skb = netdev_alloc_skb_ip_align(ndev, len);
62 if (unlikely(!skb))
63 return -ENOMEM;
64 buf_pool->rx_skb[tail] = skb;
65
66 dma_addr = dma_map_single(dev, skb->data, len, DMA_FROM_DEVICE);
67 if (dma_mapping_error(dev, dma_addr)) {
68 netdev_err(ndev, "DMA mapping error\n");
69 dev_kfree_skb_any(skb);
70 return -EINVAL;
71 }
72
73 raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) |
74 SET_VAL(BUFDATALEN, bufdatalen) |
75 SET_BIT(COHERENT));
76 tail = (tail + 1) & slots;
77 }
78
79 iowrite32(nbuf, buf_pool->cmd);
80 buf_pool->tail = tail;
81
82 return 0;
83}
84
85static u16 xgene_enet_dst_ring_num(struct xgene_enet_desc_ring *ring)
86{
87 struct xgene_enet_pdata *pdata = netdev_priv(ring->ndev);
88
89 return ((u16)pdata->rm << 10) | ring->num;
90}
91
92static u8 xgene_enet_hdr_len(const void *data)
93{
94 const struct ethhdr *eth = data;
95
96 return (eth->h_proto == htons(ETH_P_8021Q)) ? VLAN_ETH_HLEN : ETH_HLEN;
97}
98
99static u32 xgene_enet_ring_len(struct xgene_enet_desc_ring *ring)
100{
101 u32 __iomem *cmd_base = ring->cmd_base;
102 u32 ring_state, num_msgs;
103
104 ring_state = ioread32(&cmd_base[1]);
105 num_msgs = ring_state & CREATE_MASK(NUMMSGSINQ_POS, NUMMSGSINQ_LEN);
106
107 return num_msgs >> NUMMSGSINQ_POS;
108}
109
110static void xgene_enet_delete_bufpool(struct xgene_enet_desc_ring *buf_pool)
111{
112 struct xgene_enet_raw_desc16 *raw_desc;
113 u32 slots = buf_pool->slots - 1;
114 u32 tail = buf_pool->tail;
115 u32 userinfo;
116 int i, len;
117
118 len = xgene_enet_ring_len(buf_pool);
119 for (i = 0; i < len; i++) {
120 tail = (tail - 1) & slots;
121 raw_desc = &buf_pool->raw_desc16[tail];
122
123 /* Hardware stores descriptor in little endian format */
124 userinfo = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0));
125 dev_kfree_skb_any(buf_pool->rx_skb[userinfo]);
126 }
127
128 iowrite32(-len, buf_pool->cmd);
129 buf_pool->tail = tail;
130}
131
132static irqreturn_t xgene_enet_rx_irq(const int irq, void *data)
133{
134 struct xgene_enet_desc_ring *rx_ring = data;
135
136 if (napi_schedule_prep(&rx_ring->napi)) {
137 disable_irq_nosync(irq);
138 __napi_schedule(&rx_ring->napi);
139 }
140
141 return IRQ_HANDLED;
142}
143
144static int xgene_enet_tx_completion(struct xgene_enet_desc_ring *cp_ring,
145 struct xgene_enet_raw_desc *raw_desc)
146{
147 struct sk_buff *skb;
148 struct device *dev;
149 u16 skb_index;
150 u8 status;
151 int ret = 0;
152
153 skb_index = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0));
154 skb = cp_ring->cp_skb[skb_index];
155
156 dev = ndev_to_dev(cp_ring->ndev);
157 dma_unmap_single(dev, GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)),
158 GET_VAL(BUFDATALEN, le64_to_cpu(raw_desc->m1)),
159 DMA_TO_DEVICE);
160
161 /* Checking for error */
162 status = GET_VAL(LERR, le64_to_cpu(raw_desc->m0));
163 if (unlikely(status > 2)) {
164 xgene_enet_parse_error(cp_ring, netdev_priv(cp_ring->ndev),
165 status);
166 ret = -EIO;
167 }
168
169 if (likely(skb)) {
170 dev_kfree_skb_any(skb);
171 } else {
172 netdev_err(cp_ring->ndev, "completion skb is NULL\n");
173 ret = -EIO;
174 }
175
176 return ret;
177}
178
179static u64 xgene_enet_work_msg(struct sk_buff *skb)
180{
181 struct iphdr *iph;
182 u8 l3hlen, l4hlen = 0;
183 u8 csum_enable = 0;
184 u8 proto = 0;
185 u8 ethhdr;
186 u64 hopinfo;
187
188 if (unlikely(skb->protocol != htons(ETH_P_IP)) &&
189 unlikely(skb->protocol != htons(ETH_P_8021Q)))
190 goto out;
191
192 if (unlikely(!(skb->dev->features & NETIF_F_IP_CSUM)))
193 goto out;
194
195 iph = ip_hdr(skb);
196 if (unlikely(ip_is_fragment(iph)))
197 goto out;
198
199 if (likely(iph->protocol == IPPROTO_TCP)) {
200 l4hlen = tcp_hdrlen(skb) >> 2;
201 csum_enable = 1;
202 proto = TSO_IPPROTO_TCP;
203 } else if (iph->protocol == IPPROTO_UDP) {
204 l4hlen = UDP_HDR_SIZE;
205 csum_enable = 1;
206 }
207out:
208 l3hlen = ip_hdrlen(skb) >> 2;
209 ethhdr = xgene_enet_hdr_len(skb->data);
210 hopinfo = SET_VAL(TCPHDR, l4hlen) |
211 SET_VAL(IPHDR, l3hlen) |
212 SET_VAL(ETHHDR, ethhdr) |
213 SET_VAL(EC, csum_enable) |
214 SET_VAL(IS, proto) |
215 SET_BIT(IC) |
216 SET_BIT(TYPE_ETH_WORK_MESSAGE);
217
218 return hopinfo;
219}
220
221static int xgene_enet_setup_tx_desc(struct xgene_enet_desc_ring *tx_ring,
222 struct sk_buff *skb)
223{
224 struct device *dev = ndev_to_dev(tx_ring->ndev);
225 struct xgene_enet_raw_desc *raw_desc;
226 dma_addr_t dma_addr;
227 u16 tail = tx_ring->tail;
228 u64 hopinfo;
229
230 raw_desc = &tx_ring->raw_desc[tail];
231 memset(raw_desc, 0, sizeof(struct xgene_enet_raw_desc));
232
233 dma_addr = dma_map_single(dev, skb->data, skb->len, DMA_TO_DEVICE);
234 if (dma_mapping_error(dev, dma_addr)) {
235 netdev_err(tx_ring->ndev, "DMA mapping error\n");
236 return -EINVAL;
237 }
238
239 /* Hardware expects descriptor in little endian format */
240 raw_desc->m0 = cpu_to_le64(tail);
241 raw_desc->m1 = cpu_to_le64(SET_VAL(DATAADDR, dma_addr) |
242 SET_VAL(BUFDATALEN, skb->len) |
243 SET_BIT(COHERENT));
244 hopinfo = xgene_enet_work_msg(skb);
245 raw_desc->m3 = cpu_to_le64(SET_VAL(HENQNUM, tx_ring->dst_ring_num) |
246 hopinfo);
247 tx_ring->cp_ring->cp_skb[tail] = skb;
248
249 return 0;
250}
251
252static netdev_tx_t xgene_enet_start_xmit(struct sk_buff *skb,
253 struct net_device *ndev)
254{
255 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
256 struct xgene_enet_desc_ring *tx_ring = pdata->tx_ring;
257 struct xgene_enet_desc_ring *cp_ring = tx_ring->cp_ring;
258 u32 tx_level, cq_level;
259
260 tx_level = xgene_enet_ring_len(tx_ring);
261 cq_level = xgene_enet_ring_len(cp_ring);
262 if (unlikely(tx_level > pdata->tx_qcnt_hi ||
263 cq_level > pdata->cp_qcnt_hi)) {
264 netif_stop_queue(ndev);
265 return NETDEV_TX_BUSY;
266 }
267
268 if (xgene_enet_setup_tx_desc(tx_ring, skb)) {
269 dev_kfree_skb_any(skb);
270 return NETDEV_TX_OK;
271 }
272
273 iowrite32(1, tx_ring->cmd);
274 skb_tx_timestamp(skb);
275 tx_ring->tail = (tx_ring->tail + 1) & (tx_ring->slots - 1);
276
277 pdata->stats.tx_packets++;
278 pdata->stats.tx_bytes += skb->len;
279
280 return NETDEV_TX_OK;
281}
282
283static void xgene_enet_skip_csum(struct sk_buff *skb)
284{
285 struct iphdr *iph = ip_hdr(skb);
286
287 if (!ip_is_fragment(iph) ||
288 (iph->protocol != IPPROTO_TCP && iph->protocol != IPPROTO_UDP)) {
289 skb->ip_summed = CHECKSUM_UNNECESSARY;
290 }
291}
292
293static int xgene_enet_rx_frame(struct xgene_enet_desc_ring *rx_ring,
294 struct xgene_enet_raw_desc *raw_desc)
295{
296 struct net_device *ndev;
297 struct xgene_enet_pdata *pdata;
298 struct device *dev;
299 struct xgene_enet_desc_ring *buf_pool;
300 u32 datalen, skb_index;
301 struct sk_buff *skb;
302 u8 status;
303 int ret = 0;
304
305 ndev = rx_ring->ndev;
306 pdata = netdev_priv(ndev);
307 dev = ndev_to_dev(rx_ring->ndev);
308 buf_pool = rx_ring->buf_pool;
309
310 dma_unmap_single(dev, GET_VAL(DATAADDR, le64_to_cpu(raw_desc->m1)),
311 XGENE_ENET_MAX_MTU, DMA_FROM_DEVICE);
312 skb_index = GET_VAL(USERINFO, le64_to_cpu(raw_desc->m0));
313 skb = buf_pool->rx_skb[skb_index];
314
315 /* checking for error */
316 status = GET_VAL(LERR, le64_to_cpu(raw_desc->m0));
317 if (unlikely(status > 2)) {
318 dev_kfree_skb_any(skb);
319 xgene_enet_parse_error(rx_ring, netdev_priv(rx_ring->ndev),
320 status);
321 pdata->stats.rx_dropped++;
322 ret = -EIO;
323 goto out;
324 }
325
326 /* strip off CRC as HW isn't doing this */
327 datalen = GET_VAL(BUFDATALEN, le64_to_cpu(raw_desc->m1));
328 datalen -= 4;
329 prefetch(skb->data - NET_IP_ALIGN);
330 skb_put(skb, datalen);
331
332 skb_checksum_none_assert(skb);
333 skb->protocol = eth_type_trans(skb, ndev);
334 if (likely((ndev->features & NETIF_F_IP_CSUM) &&
335 skb->protocol == htons(ETH_P_IP))) {
336 xgene_enet_skip_csum(skb);
337 }
338
339 pdata->stats.rx_packets++;
340 pdata->stats.rx_bytes += datalen;
341 napi_gro_receive(&rx_ring->napi, skb);
342out:
343 if (--rx_ring->nbufpool == 0) {
344 ret = xgene_enet_refill_bufpool(buf_pool, NUM_BUFPOOL);
345 rx_ring->nbufpool = NUM_BUFPOOL;
346 }
347
348 return ret;
349}
350
351static bool is_rx_desc(struct xgene_enet_raw_desc *raw_desc)
352{
353 return GET_VAL(FPQNUM, le64_to_cpu(raw_desc->m0)) ? true : false;
354}
355
356static int xgene_enet_process_ring(struct xgene_enet_desc_ring *ring,
357 int budget)
358{
359 struct xgene_enet_pdata *pdata = netdev_priv(ring->ndev);
360 struct xgene_enet_raw_desc *raw_desc;
361 u16 head = ring->head;
362 u16 slots = ring->slots - 1;
363 int ret, count = 0;
364
365 do {
366 raw_desc = &ring->raw_desc[head];
367 if (unlikely(xgene_enet_is_desc_slot_empty(raw_desc)))
368 break;
369
370 if (is_rx_desc(raw_desc))
371 ret = xgene_enet_rx_frame(ring, raw_desc);
372 else
373 ret = xgene_enet_tx_completion(ring, raw_desc);
374 xgene_enet_mark_desc_slot_empty(raw_desc);
375
376 head = (head + 1) & slots;
377 count++;
378
379 if (ret)
380 break;
381 } while (--budget);
382
383 if (likely(count)) {
384 iowrite32(-count, ring->cmd);
385 ring->head = head;
386
387 if (netif_queue_stopped(ring->ndev)) {
388 if (xgene_enet_ring_len(ring) < pdata->cp_qcnt_low)
389 netif_wake_queue(ring->ndev);
390 }
391 }
392
393 return budget;
394}
395
396static int xgene_enet_napi(struct napi_struct *napi, const int budget)
397{
398 struct xgene_enet_desc_ring *ring;
399 int processed;
400
401 ring = container_of(napi, struct xgene_enet_desc_ring, napi);
402 processed = xgene_enet_process_ring(ring, budget);
403
404 if (processed != budget) {
405 napi_complete(napi);
406 enable_irq(ring->irq);
407 }
408
409 return processed;
410}
411
412static void xgene_enet_timeout(struct net_device *ndev)
413{
414 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
415
416 xgene_gmac_reset(pdata);
417}
418
419static int xgene_enet_register_irq(struct net_device *ndev)
420{
421 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
422 struct device *dev = ndev_to_dev(ndev);
423 int ret;
424
425 ret = devm_request_irq(dev, pdata->rx_ring->irq, xgene_enet_rx_irq,
426 IRQF_SHARED, ndev->name, pdata->rx_ring);
427 if (ret) {
428 netdev_err(ndev, "rx%d interrupt request failed\n",
429 pdata->rx_ring->irq);
430 }
431
432 return ret;
433}
434
435static void xgene_enet_free_irq(struct net_device *ndev)
436{
437 struct xgene_enet_pdata *pdata;
438 struct device *dev;
439
440 pdata = netdev_priv(ndev);
441 dev = ndev_to_dev(ndev);
442 devm_free_irq(dev, pdata->rx_ring->irq, pdata->rx_ring);
443}
444
445static int xgene_enet_open(struct net_device *ndev)
446{
447 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
448 int ret;
449
450 xgene_gmac_tx_enable(pdata);
451 xgene_gmac_rx_enable(pdata);
452
453 ret = xgene_enet_register_irq(ndev);
454 if (ret)
455 return ret;
456 napi_enable(&pdata->rx_ring->napi);
457
458 if (pdata->phy_dev)
459 phy_start(pdata->phy_dev);
460
461 netif_start_queue(ndev);
462
463 return ret;
464}
465
466static int xgene_enet_close(struct net_device *ndev)
467{
468 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
469
470 netif_stop_queue(ndev);
471
472 if (pdata->phy_dev)
473 phy_stop(pdata->phy_dev);
474
475 napi_disable(&pdata->rx_ring->napi);
476 xgene_enet_free_irq(ndev);
477 xgene_enet_process_ring(pdata->rx_ring, -1);
478
479 xgene_gmac_tx_disable(pdata);
480 xgene_gmac_rx_disable(pdata);
481
482 return 0;
483}
484
485static void xgene_enet_delete_ring(struct xgene_enet_desc_ring *ring)
486{
487 struct xgene_enet_pdata *pdata;
488 struct device *dev;
489
490 pdata = netdev_priv(ring->ndev);
491 dev = ndev_to_dev(ring->ndev);
492
493 xgene_enet_clear_ring(ring);
494 dma_free_coherent(dev, ring->size, ring->desc_addr, ring->dma);
495}
496
497static void xgene_enet_delete_desc_rings(struct xgene_enet_pdata *pdata)
498{
499 struct xgene_enet_desc_ring *buf_pool;
500
501 if (pdata->tx_ring) {
502 xgene_enet_delete_ring(pdata->tx_ring);
503 pdata->tx_ring = NULL;
504 }
505
506 if (pdata->rx_ring) {
507 buf_pool = pdata->rx_ring->buf_pool;
508 xgene_enet_delete_bufpool(buf_pool);
509 xgene_enet_delete_ring(buf_pool);
510 xgene_enet_delete_ring(pdata->rx_ring);
511 pdata->rx_ring = NULL;
512 }
513}
514
515static int xgene_enet_get_ring_size(struct device *dev,
516 enum xgene_enet_ring_cfgsize cfgsize)
517{
518 int size = -EINVAL;
519
520 switch (cfgsize) {
521 case RING_CFGSIZE_512B:
522 size = 0x200;
523 break;
524 case RING_CFGSIZE_2KB:
525 size = 0x800;
526 break;
527 case RING_CFGSIZE_16KB:
528 size = 0x4000;
529 break;
530 case RING_CFGSIZE_64KB:
531 size = 0x10000;
532 break;
533 case RING_CFGSIZE_512KB:
534 size = 0x80000;
535 break;
536 default:
537 dev_err(dev, "Unsupported cfg ring size %d\n", cfgsize);
538 break;
539 }
540
541 return size;
542}
543
544static void xgene_enet_free_desc_ring(struct xgene_enet_desc_ring *ring)
545{
546 struct device *dev;
547
548 if (!ring)
549 return;
550
551 dev = ndev_to_dev(ring->ndev);
552
553 if (ring->desc_addr) {
554 xgene_enet_clear_ring(ring);
555 dma_free_coherent(dev, ring->size, ring->desc_addr, ring->dma);
556 }
557 devm_kfree(dev, ring);
558}
559
560static void xgene_enet_free_desc_rings(struct xgene_enet_pdata *pdata)
561{
562 struct device *dev = &pdata->pdev->dev;
563 struct xgene_enet_desc_ring *ring;
564
565 ring = pdata->tx_ring;
566 if (ring && ring->cp_ring && ring->cp_ring->cp_skb)
567 devm_kfree(dev, ring->cp_ring->cp_skb);
568 xgene_enet_free_desc_ring(ring);
569
570 ring = pdata->rx_ring;
571 if (ring && ring->buf_pool && ring->buf_pool->rx_skb)
572 devm_kfree(dev, ring->buf_pool->rx_skb);
573 xgene_enet_free_desc_ring(ring->buf_pool);
574 xgene_enet_free_desc_ring(ring);
575}
576
577static struct xgene_enet_desc_ring *xgene_enet_create_desc_ring(
578 struct net_device *ndev, u32 ring_num,
579 enum xgene_enet_ring_cfgsize cfgsize, u32 ring_id)
580{
581 struct xgene_enet_desc_ring *ring;
582 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
583 struct device *dev = ndev_to_dev(ndev);
584 u32 size;
585
586 ring = devm_kzalloc(dev, sizeof(struct xgene_enet_desc_ring),
587 GFP_KERNEL);
588 if (!ring)
589 return NULL;
590
591 ring->ndev = ndev;
592 ring->num = ring_num;
593 ring->cfgsize = cfgsize;
594 ring->id = ring_id;
595
596 size = xgene_enet_get_ring_size(dev, cfgsize);
597 ring->desc_addr = dma_zalloc_coherent(dev, size, &ring->dma,
598 GFP_KERNEL);
599 if (!ring->desc_addr) {
600 devm_kfree(dev, ring);
601 return NULL;
602 }
603 ring->size = size;
604
605 ring->cmd_base = pdata->ring_cmd_addr + (ring->num << 6);
606 ring->cmd = ring->cmd_base + INC_DEC_CMD_ADDR;
607 pdata->rm = RM3;
608 ring = xgene_enet_setup_ring(ring);
609 netdev_dbg(ndev, "ring info: num=%d size=%d id=%d slots=%d\n",
610 ring->num, ring->size, ring->id, ring->slots);
611
612 return ring;
613}
614
615static u16 xgene_enet_get_ring_id(enum xgene_ring_owner owner, u8 bufnum)
616{
617 return (owner << 6) | (bufnum & GENMASK(5, 0));
618}
619
620static int xgene_enet_create_desc_rings(struct net_device *ndev)
621{
622 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
623 struct device *dev = ndev_to_dev(ndev);
624 struct xgene_enet_desc_ring *rx_ring, *tx_ring, *cp_ring;
625 struct xgene_enet_desc_ring *buf_pool = NULL;
626 u8 cpu_bufnum = 0, eth_bufnum = 0;
627 u8 bp_bufnum = 0x20;
628 u16 ring_id, ring_num = 0;
629 int ret;
630
631 /* allocate rx descriptor ring */
632 ring_id = xgene_enet_get_ring_id(RING_OWNER_CPU, cpu_bufnum++);
633 rx_ring = xgene_enet_create_desc_ring(ndev, ring_num++,
634 RING_CFGSIZE_16KB, ring_id);
635 if (!rx_ring) {
636 ret = -ENOMEM;
637 goto err;
638 }
639
640 /* allocate buffer pool for receiving packets */
641 ring_id = xgene_enet_get_ring_id(RING_OWNER_ETH0, bp_bufnum++);
642 buf_pool = xgene_enet_create_desc_ring(ndev, ring_num++,
643 RING_CFGSIZE_2KB, ring_id);
644 if (!buf_pool) {
645 ret = -ENOMEM;
646 goto err;
647 }
648
649 rx_ring->nbufpool = NUM_BUFPOOL;
650 rx_ring->buf_pool = buf_pool;
651 rx_ring->irq = pdata->rx_irq;
652 buf_pool->rx_skb = devm_kcalloc(dev, buf_pool->slots,
653 sizeof(struct sk_buff *), GFP_KERNEL);
654 if (!buf_pool->rx_skb) {
655 ret = -ENOMEM;
656 goto err;
657 }
658
659 buf_pool->dst_ring_num = xgene_enet_dst_ring_num(buf_pool);
660 rx_ring->buf_pool = buf_pool;
661 pdata->rx_ring = rx_ring;
662
663 /* allocate tx descriptor ring */
664 ring_id = xgene_enet_get_ring_id(RING_OWNER_ETH0, eth_bufnum++);
665 tx_ring = xgene_enet_create_desc_ring(ndev, ring_num++,
666 RING_CFGSIZE_16KB, ring_id);
667 if (!tx_ring) {
668 ret = -ENOMEM;
669 goto err;
670 }
671 pdata->tx_ring = tx_ring;
672
673 cp_ring = pdata->rx_ring;
674 cp_ring->cp_skb = devm_kcalloc(dev, tx_ring->slots,
675 sizeof(struct sk_buff *), GFP_KERNEL);
676 if (!cp_ring->cp_skb) {
677 ret = -ENOMEM;
678 goto err;
679 }
680 pdata->tx_ring->cp_ring = cp_ring;
681 pdata->tx_ring->dst_ring_num = xgene_enet_dst_ring_num(cp_ring);
682
683 pdata->tx_qcnt_hi = pdata->tx_ring->slots / 2;
684 pdata->cp_qcnt_hi = pdata->rx_ring->slots / 2;
685 pdata->cp_qcnt_low = pdata->cp_qcnt_hi / 2;
686
687 return 0;
688
689err:
690 xgene_enet_free_desc_rings(pdata);
691 return ret;
692}
693
694static struct rtnl_link_stats64 *xgene_enet_get_stats64(
695 struct net_device *ndev,
696 struct rtnl_link_stats64 *storage)
697{
698 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
699 struct rtnl_link_stats64 *stats = &pdata->stats;
700
701 stats->rx_errors += stats->rx_length_errors +
702 stats->rx_crc_errors +
703 stats->rx_frame_errors +
704 stats->rx_fifo_errors;
705 memcpy(storage, &pdata->stats, sizeof(struct rtnl_link_stats64));
706
707 return storage;
708}
709
710static int xgene_enet_set_mac_address(struct net_device *ndev, void *addr)
711{
712 struct xgene_enet_pdata *pdata = netdev_priv(ndev);
713 int ret;
714
715 ret = eth_mac_addr(ndev, addr);
716 if (ret)
717 return ret;
718 xgene_gmac_set_mac_addr(pdata);
719
720 return ret;
721}
722
723static const struct net_device_ops xgene_ndev_ops = {
724 .ndo_open = xgene_enet_open,
725 .ndo_stop = xgene_enet_close,
726 .ndo_start_xmit = xgene_enet_start_xmit,
727 .ndo_tx_timeout = xgene_enet_timeout,
728 .ndo_get_stats64 = xgene_enet_get_stats64,
729 .ndo_change_mtu = eth_change_mtu,
730 .ndo_set_mac_address = xgene_enet_set_mac_address,
731};
732
733static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)
734{
735 struct platform_device *pdev;
736 struct net_device *ndev;
737 struct device *dev;
738 struct resource *res;
739 void __iomem *base_addr;
740 const char *mac;
741 int ret;
742
743 pdev = pdata->pdev;
744 dev = &pdev->dev;
745 ndev = pdata->ndev;
746
747 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "enet_csr");
748 if (!res) {
749 dev_err(dev, "Resource enet_csr not defined\n");
750 return -ENODEV;
751 }
752 pdata->base_addr = devm_ioremap_resource(dev, res);
753 if (IS_ERR(pdata->base_addr)) {
754 dev_err(dev, "Unable to retrieve ENET Port CSR region\n");
755 return PTR_ERR(pdata->base_addr);
756 }
757
758 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ring_csr");
759 if (!res) {
760 dev_err(dev, "Resource ring_csr not defined\n");
761 return -ENODEV;
762 }
763 pdata->ring_csr_addr = devm_ioremap_resource(dev, res);
764 if (IS_ERR(pdata->ring_csr_addr)) {
765 dev_err(dev, "Unable to retrieve ENET Ring CSR region\n");
766 return PTR_ERR(pdata->ring_csr_addr);
767 }
768
769 res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "ring_cmd");
770 if (!res) {
771 dev_err(dev, "Resource ring_cmd not defined\n");
772 return -ENODEV;
773 }
774 pdata->ring_cmd_addr = devm_ioremap_resource(dev, res);
775 if (IS_ERR(pdata->ring_cmd_addr)) {
776 dev_err(dev, "Unable to retrieve ENET Ring command region\n");
777 return PTR_ERR(pdata->ring_cmd_addr);
778 }
779
780 ret = platform_get_irq(pdev, 0);
781 if (ret <= 0) {
782 dev_err(dev, "Unable to get ENET Rx IRQ\n");
783 ret = ret ? : -ENXIO;
784 return ret;
785 }
786 pdata->rx_irq = ret;
787
788 mac = of_get_mac_address(dev->of_node);
789 if (mac)
790 memcpy(ndev->dev_addr, mac, ndev->addr_len);
791 else
792 eth_hw_addr_random(ndev);
793 memcpy(ndev->perm_addr, ndev->dev_addr, ndev->addr_len);
794
795 pdata->phy_mode = of_get_phy_mode(pdev->dev.of_node);
796 if (pdata->phy_mode < 0) {
797 dev_err(dev, "Incorrect phy-connection-type in DTS\n");
798 return -EINVAL;
799 }
800
801 pdata->clk = devm_clk_get(&pdev->dev, NULL);
802 ret = IS_ERR(pdata->clk);
803 if (IS_ERR(pdata->clk)) {
804 dev_err(&pdev->dev, "can't get clock\n");
805 ret = PTR_ERR(pdata->clk);
806 return ret;
807 }
808
809 base_addr = pdata->base_addr;
810 pdata->eth_csr_addr = base_addr + BLOCK_ETH_CSR_OFFSET;
811 pdata->eth_ring_if_addr = base_addr + BLOCK_ETH_RING_IF_OFFSET;
812 pdata->eth_diag_csr_addr = base_addr + BLOCK_ETH_DIAG_CSR_OFFSET;
813 pdata->mcx_mac_addr = base_addr + BLOCK_ETH_MAC_OFFSET;
814 pdata->mcx_stats_addr = base_addr + BLOCK_ETH_STATS_OFFSET;
815 pdata->mcx_mac_csr_addr = base_addr + BLOCK_ETH_MAC_CSR_OFFSET;
816 pdata->rx_buff_cnt = NUM_PKT_BUF;
817
818 return ret;
819}
820
821static int xgene_enet_init_hw(struct xgene_enet_pdata *pdata)
822{
823 struct net_device *ndev = pdata->ndev;
824 struct xgene_enet_desc_ring *buf_pool;
825 u16 dst_ring_num;
826 int ret;
827
828 xgene_gmac_tx_disable(pdata);
829 xgene_gmac_rx_disable(pdata);
830
831 ret = xgene_enet_create_desc_rings(ndev);
832 if (ret) {
833 netdev_err(ndev, "Error in ring configuration\n");
834 return ret;
835 }
836
837 /* setup buffer pool */
838 buf_pool = pdata->rx_ring->buf_pool;
839 xgene_enet_init_bufpool(buf_pool);
840 ret = xgene_enet_refill_bufpool(buf_pool, pdata->rx_buff_cnt);
841 if (ret) {
842 xgene_enet_delete_desc_rings(pdata);
843 return ret;
844 }
845
846 dst_ring_num = xgene_enet_dst_ring_num(pdata->rx_ring);
847 xgene_enet_cle_bypass(pdata, dst_ring_num, buf_pool->id);
848
849 return ret;
850}
851
852static int xgene_enet_probe(struct platform_device *pdev)
853{
854 struct net_device *ndev;
855 struct xgene_enet_pdata *pdata;
856 struct device *dev = &pdev->dev;
857 struct napi_struct *napi;
858 int ret;
859
860 ndev = alloc_etherdev(sizeof(struct xgene_enet_pdata));
861 if (!ndev)
862 return -ENOMEM;
863
864 pdata = netdev_priv(ndev);
865
866 pdata->pdev = pdev;
867 pdata->ndev = ndev;
868 SET_NETDEV_DEV(ndev, dev);
869 platform_set_drvdata(pdev, pdata);
870 ndev->netdev_ops = &xgene_ndev_ops;
871 xgene_enet_set_ethtool_ops(ndev);
872 ndev->features |= NETIF_F_IP_CSUM |
873 NETIF_F_GSO |
874 NETIF_F_GRO;
875
876 ret = xgene_enet_get_resources(pdata);
877 if (ret)
878 goto err;
879
880 xgene_enet_reset(pdata);
881 xgene_gmac_init(pdata, SPEED_1000);
882
883 ret = register_netdev(ndev);
884 if (ret) {
885 netdev_err(ndev, "Failed to register netdev\n");
886 goto err;
887 }
888
889 ret = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
890 if (ret) {
891 netdev_err(ndev, "No usable DMA configuration\n");
892 goto err;
893 }
894
895 ret = xgene_enet_init_hw(pdata);
896 if (ret)
897 goto err;
898
899 napi = &pdata->rx_ring->napi;
900 netif_napi_add(ndev, napi, xgene_enet_napi, NAPI_POLL_WEIGHT);
901 ret = xgene_enet_mdio_config(pdata);
902
903 return ret;
904err:
905 free_netdev(ndev);
906 return ret;
907}
908
909static int xgene_enet_remove(struct platform_device *pdev)
910{
911 struct xgene_enet_pdata *pdata;
912 struct net_device *ndev;
913
914 pdata = platform_get_drvdata(pdev);
915 ndev = pdata->ndev;
916
917 xgene_gmac_rx_disable(pdata);
918 xgene_gmac_tx_disable(pdata);
919
920 netif_napi_del(&pdata->rx_ring->napi);
921 xgene_enet_mdio_remove(pdata);
922 xgene_enet_delete_desc_rings(pdata);
923 unregister_netdev(ndev);
924 xgene_gport_shutdown(pdata);
925 free_netdev(ndev);
926
927 return 0;
928}
929
930static struct of_device_id xgene_enet_match[] = {
931 {.compatible = "apm,xgene-enet",},
932 {},
933};
934
935MODULE_DEVICE_TABLE(of, xgene_enet_match);
936
937static struct platform_driver xgene_enet_driver = {
938 .driver = {
939 .name = "xgene-enet",
940 .of_match_table = xgene_enet_match,
941 },
942 .probe = xgene_enet_probe,
943 .remove = xgene_enet_remove,
944};
945
946module_platform_driver(xgene_enet_driver);
947
948MODULE_DESCRIPTION("APM X-Gene SoC Ethernet driver");
949MODULE_VERSION(XGENE_DRV_VERSION);
950MODULE_AUTHOR("Keyur Chudgar <kchudgar@apm.com>");
951MODULE_LICENSE("GPL");
Linux 6.x block layer and io_uring tree(s)