1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2 /* Copyright (c) 2021, Microsoft Corporation. */
3 
4 #include <uapi/linux/bpf.h>
5 
6 #include <linux/debugfs.h>
7 #include <linux/inetdevice.h>
8 #include <linux/etherdevice.h>
9 #include <linux/ethtool.h>
10 #include <linux/filter.h>
11 #include <linux/mm.h>
12 #include <linux/pci.h>
13 
14 #include <net/checksum.h>
15 #include <net/ip6_checksum.h>
16 #include <net/netdev_lock.h>
17 #include <net/page_pool/helpers.h>
18 #include <net/xdp.h>
19 
20 #include <net/mana/mana.h>
21 #include <net/mana/mana_auxiliary.h>
22 
23 static DEFINE_IDA(mana_adev_ida);
24 
mana_adev_idx_alloc(void)25 static int mana_adev_idx_alloc(void)
26 {
27 	return ida_alloc(&mana_adev_ida, GFP_KERNEL);
28 }
29 
mana_adev_idx_free(int idx)30 static void mana_adev_idx_free(int idx)
31 {
32 	ida_free(&mana_adev_ida, idx);
33 }
34 
mana_dbg_q_read(struct file * filp,char __user * buf,size_t count,loff_t * pos)35 static ssize_t mana_dbg_q_read(struct file *filp, char __user *buf, size_t count,
36 			       loff_t *pos)
37 {
38 	struct gdma_queue *gdma_q = filp->private_data;
39 
40 	return simple_read_from_buffer(buf, count, pos, gdma_q->queue_mem_ptr,
41 				       gdma_q->queue_size);
42 }
43 
44 static const struct file_operations mana_dbg_q_fops = {
45 	.owner  = THIS_MODULE,
46 	.open   = simple_open,
47 	.read   = mana_dbg_q_read,
48 };
49 
50 /* Microsoft Azure Network Adapter (MANA) functions */
51 
mana_open(struct net_device * ndev)52 static int mana_open(struct net_device *ndev)
53 {
54 	struct mana_port_context *apc = netdev_priv(ndev);
55 	int err;
56 	err = mana_alloc_queues(ndev);
57 
58 	if (err) {
59 		netdev_err(ndev, "%s failed to allocate queues: %d\n", __func__, err);
60 		return err;
61 	}
62 
63 	apc->port_is_up = true;
64 
65 	/* Ensure port state updated before txq state */
66 	smp_wmb();
67 
68 	netif_carrier_on(ndev);
69 	netif_tx_wake_all_queues(ndev);
70 	netdev_dbg(ndev, "%s successful\n", __func__);
71 	return 0;
72 }
73 
mana_close(struct net_device * ndev)74 static int mana_close(struct net_device *ndev)
75 {
76 	struct mana_port_context *apc = netdev_priv(ndev);
77 
78 	if (!apc->port_is_up)
79 		return 0;
80 
81 	return mana_detach(ndev, true);
82 }
83 
mana_can_tx(struct gdma_queue * wq)84 static bool mana_can_tx(struct gdma_queue *wq)
85 {
86 	return mana_gd_wq_avail_space(wq) >= MAX_TX_WQE_SIZE;
87 }
88 
mana_checksum_info(struct sk_buff * skb)89 static unsigned int mana_checksum_info(struct sk_buff *skb)
90 {
91 	if (skb->protocol == htons(ETH_P_IP)) {
92 		struct iphdr *ip = ip_hdr(skb);
93 
94 		if (ip->protocol == IPPROTO_TCP)
95 			return IPPROTO_TCP;
96 
97 		if (ip->protocol == IPPROTO_UDP)
98 			return IPPROTO_UDP;
99 	} else if (skb->protocol == htons(ETH_P_IPV6)) {
100 		struct ipv6hdr *ip6 = ipv6_hdr(skb);
101 
102 		if (ip6->nexthdr == IPPROTO_TCP)
103 			return IPPROTO_TCP;
104 
105 		if (ip6->nexthdr == IPPROTO_UDP)
106 			return IPPROTO_UDP;
107 	}
108 
109 	/* No csum offloading */
110 	return 0;
111 }
112 
mana_add_sge(struct mana_tx_package * tp,struct mana_skb_head * ash,int sg_i,dma_addr_t da,int sge_len,u32 gpa_mkey)113 static void mana_add_sge(struct mana_tx_package *tp, struct mana_skb_head *ash,
114 			 int sg_i, dma_addr_t da, int sge_len, u32 gpa_mkey)
115 {
116 	ash->dma_handle[sg_i] = da;
117 	ash->size[sg_i] = sge_len;
118 
119 	tp->wqe_req.sgl[sg_i].address = da;
120 	tp->wqe_req.sgl[sg_i].mem_key = gpa_mkey;
121 	tp->wqe_req.sgl[sg_i].size = sge_len;
122 }
123 
mana_map_skb(struct sk_buff * skb,struct mana_port_context * apc,struct mana_tx_package * tp,int gso_hs)124 static int mana_map_skb(struct sk_buff *skb, struct mana_port_context *apc,
125 			struct mana_tx_package *tp, int gso_hs)
126 {
127 	struct mana_skb_head *ash = (struct mana_skb_head *)skb->head;
128 	int hsg = 1; /* num of SGEs of linear part */
129 	struct gdma_dev *gd = apc->ac->gdma_dev;
130 	int skb_hlen = skb_headlen(skb);
131 	int sge0_len, sge1_len = 0;
132 	struct gdma_context *gc;
133 	struct device *dev;
134 	skb_frag_t *frag;
135 	dma_addr_t da;
136 	int sg_i;
137 	int i;
138 
139 	gc = gd->gdma_context;
140 	dev = gc->dev;
141 
142 	if (gso_hs && gso_hs < skb_hlen) {
143 		sge0_len = gso_hs;
144 		sge1_len = skb_hlen - gso_hs;
145 	} else {
146 		sge0_len = skb_hlen;
147 	}
148 
149 	da = dma_map_single(dev, skb->data, sge0_len, DMA_TO_DEVICE);
150 	if (dma_mapping_error(dev, da))
151 		return -ENOMEM;
152 
153 	mana_add_sge(tp, ash, 0, da, sge0_len, gd->gpa_mkey);
154 
155 	if (sge1_len) {
156 		sg_i = 1;
157 		da = dma_map_single(dev, skb->data + sge0_len, sge1_len,
158 				    DMA_TO_DEVICE);
159 		if (dma_mapping_error(dev, da))
160 			goto frag_err;
161 
162 		mana_add_sge(tp, ash, sg_i, da, sge1_len, gd->gpa_mkey);
163 		hsg = 2;
164 	}
165 
166 	for (i = 0; i < skb_shinfo(skb)->nr_frags; i++) {
167 		sg_i = hsg + i;
168 
169 		frag = &skb_shinfo(skb)->frags[i];
170 		da = skb_frag_dma_map(dev, frag, 0, skb_frag_size(frag),
171 				      DMA_TO_DEVICE);
172 		if (dma_mapping_error(dev, da))
173 			goto frag_err;
174 
175 		mana_add_sge(tp, ash, sg_i, da, skb_frag_size(frag),
176 			     gd->gpa_mkey);
177 	}
178 
179 	return 0;
180 
181 frag_err:
182 	if (net_ratelimit())
183 		netdev_err(apc->ndev, "Failed to map skb of size %u to DMA\n",
184 			   skb->len);
185 	for (i = sg_i - 1; i >= hsg; i--)
186 		dma_unmap_page(dev, ash->dma_handle[i], ash->size[i],
187 			       DMA_TO_DEVICE);
188 
189 	for (i = hsg - 1; i >= 0; i--)
190 		dma_unmap_single(dev, ash->dma_handle[i], ash->size[i],
191 				 DMA_TO_DEVICE);
192 
193 	return -ENOMEM;
194 }
195 
196 /* Handle the case when GSO SKB linear length is too large.
197  * MANA NIC requires GSO packets to put only the packet header to SGE0.
198  * So, we need 2 SGEs for the skb linear part which contains more than the
199  * header.
200  * Return a positive value for the number of SGEs, or a negative value
201  * for an error.
202  */
mana_fix_skb_head(struct net_device * ndev,struct sk_buff * skb,int gso_hs)203 static int mana_fix_skb_head(struct net_device *ndev, struct sk_buff *skb,
204 			     int gso_hs)
205 {
206 	int num_sge = 1 + skb_shinfo(skb)->nr_frags;
207 	int skb_hlen = skb_headlen(skb);
208 
209 	if (gso_hs < skb_hlen) {
210 		num_sge++;
211 	} else if (gso_hs > skb_hlen) {
212 		if (net_ratelimit())
213 			netdev_err(ndev,
214 				   "TX nonlinear head: hs:%d, skb_hlen:%d\n",
215 				   gso_hs, skb_hlen);
216 
217 		return -EINVAL;
218 	}
219 
220 	return num_sge;
221 }
222 
223 /* Get the GSO packet's header size */
mana_get_gso_hs(struct sk_buff * skb)224 static int mana_get_gso_hs(struct sk_buff *skb)
225 {
226 	int gso_hs;
227 
228 	if (skb->encapsulation) {
229 		gso_hs = skb_inner_tcp_all_headers(skb);
230 	} else {
231 		if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP_L4) {
232 			gso_hs = skb_transport_offset(skb) +
233 				 sizeof(struct udphdr);
234 		} else {
235 			gso_hs = skb_tcp_all_headers(skb);
236 		}
237 	}
238 
239 	return gso_hs;
240 }
241 
mana_start_xmit(struct sk_buff * skb,struct net_device * ndev)242 netdev_tx_t mana_start_xmit(struct sk_buff *skb, struct net_device *ndev)
243 {
244 	enum mana_tx_pkt_format pkt_fmt = MANA_SHORT_PKT_FMT;
245 	struct mana_port_context *apc = netdev_priv(ndev);
246 	int gso_hs = 0; /* zero for non-GSO pkts */
247 	u16 txq_idx = skb_get_queue_mapping(skb);
248 	struct gdma_dev *gd = apc->ac->gdma_dev;
249 	bool ipv4 = false, ipv6 = false;
250 	struct mana_tx_package pkg = {};
251 	struct netdev_queue *net_txq;
252 	struct mana_stats_tx *tx_stats;
253 	struct gdma_queue *gdma_sq;
254 	unsigned int csum_type;
255 	struct mana_txq *txq;
256 	struct mana_cq *cq;
257 	int err, len;
258 
259 	if (unlikely(!apc->port_is_up))
260 		goto tx_drop;
261 
262 	if (skb_cow_head(skb, MANA_HEADROOM))
263 		goto tx_drop_count;
264 
265 	if (unlikely(ipv6_hopopt_jumbo_remove(skb)))
266 		goto tx_drop_count;
267 
268 	txq = &apc->tx_qp[txq_idx].txq;
269 	gdma_sq = txq->gdma_sq;
270 	cq = &apc->tx_qp[txq_idx].tx_cq;
271 	tx_stats = &txq->stats;
272 
273 	pkg.tx_oob.s_oob.vcq_num = cq->gdma_id;
274 	pkg.tx_oob.s_oob.vsq_frame = txq->vsq_frame;
275 
276 	if (txq->vp_offset > MANA_SHORT_VPORT_OFFSET_MAX) {
277 		pkg.tx_oob.l_oob.long_vp_offset = txq->vp_offset;
278 		pkt_fmt = MANA_LONG_PKT_FMT;
279 	} else {
280 		pkg.tx_oob.s_oob.short_vp_offset = txq->vp_offset;
281 	}
282 
283 	if (skb_vlan_tag_present(skb)) {
284 		pkt_fmt = MANA_LONG_PKT_FMT;
285 		pkg.tx_oob.l_oob.inject_vlan_pri_tag = 1;
286 		pkg.tx_oob.l_oob.pcp = skb_vlan_tag_get_prio(skb);
287 		pkg.tx_oob.l_oob.dei = skb_vlan_tag_get_cfi(skb);
288 		pkg.tx_oob.l_oob.vlan_id = skb_vlan_tag_get_id(skb);
289 	}
290 
291 	pkg.tx_oob.s_oob.pkt_fmt = pkt_fmt;
292 
293 	if (pkt_fmt == MANA_SHORT_PKT_FMT) {
294 		pkg.wqe_req.inline_oob_size = sizeof(struct mana_tx_short_oob);
295 		u64_stats_update_begin(&tx_stats->syncp);
296 		tx_stats->short_pkt_fmt++;
297 		u64_stats_update_end(&tx_stats->syncp);
298 	} else {
299 		pkg.wqe_req.inline_oob_size = sizeof(struct mana_tx_oob);
300 		u64_stats_update_begin(&tx_stats->syncp);
301 		tx_stats->long_pkt_fmt++;
302 		u64_stats_update_end(&tx_stats->syncp);
303 	}
304 
305 	pkg.wqe_req.inline_oob_data = &pkg.tx_oob;
306 	pkg.wqe_req.flags = 0;
307 	pkg.wqe_req.client_data_unit = 0;
308 
309 	pkg.wqe_req.num_sge = 1 + skb_shinfo(skb)->nr_frags;
310 
311 	if (skb->protocol == htons(ETH_P_IP))
312 		ipv4 = true;
313 	else if (skb->protocol == htons(ETH_P_IPV6))
314 		ipv6 = true;
315 
316 	if (skb_is_gso(skb)) {
317 		int num_sge;
318 
319 		gso_hs = mana_get_gso_hs(skb);
320 
321 		num_sge = mana_fix_skb_head(ndev, skb, gso_hs);
322 		if (num_sge > 0)
323 			pkg.wqe_req.num_sge = num_sge;
324 		else
325 			goto tx_drop_count;
326 
327 		u64_stats_update_begin(&tx_stats->syncp);
328 		if (skb->encapsulation) {
329 			tx_stats->tso_inner_packets++;
330 			tx_stats->tso_inner_bytes += skb->len - gso_hs;
331 		} else {
332 			tx_stats->tso_packets++;
333 			tx_stats->tso_bytes += skb->len - gso_hs;
334 		}
335 		u64_stats_update_end(&tx_stats->syncp);
336 
337 		pkg.tx_oob.s_oob.is_outer_ipv4 = ipv4;
338 		pkg.tx_oob.s_oob.is_outer_ipv6 = ipv6;
339 
340 		pkg.tx_oob.s_oob.comp_iphdr_csum = 1;
341 		pkg.tx_oob.s_oob.comp_tcp_csum = 1;
342 		pkg.tx_oob.s_oob.trans_off = skb_transport_offset(skb);
343 
344 		pkg.wqe_req.client_data_unit = skb_shinfo(skb)->gso_size;
345 		pkg.wqe_req.flags = GDMA_WR_OOB_IN_SGL | GDMA_WR_PAD_BY_SGE0;
346 		if (ipv4) {
347 			ip_hdr(skb)->tot_len = 0;
348 			ip_hdr(skb)->check = 0;
349 			tcp_hdr(skb)->check =
350 				~csum_tcpudp_magic(ip_hdr(skb)->saddr,
351 						   ip_hdr(skb)->daddr, 0,
352 						   IPPROTO_TCP, 0);
353 		} else {
354 			ipv6_hdr(skb)->payload_len = 0;
355 			tcp_hdr(skb)->check =
356 				~csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
357 						 &ipv6_hdr(skb)->daddr, 0,
358 						 IPPROTO_TCP, 0);
359 		}
360 	} else if (skb->ip_summed == CHECKSUM_PARTIAL) {
361 		csum_type = mana_checksum_info(skb);
362 
363 		u64_stats_update_begin(&tx_stats->syncp);
364 		tx_stats->csum_partial++;
365 		u64_stats_update_end(&tx_stats->syncp);
366 
367 		if (csum_type == IPPROTO_TCP) {
368 			pkg.tx_oob.s_oob.is_outer_ipv4 = ipv4;
369 			pkg.tx_oob.s_oob.is_outer_ipv6 = ipv6;
370 
371 			pkg.tx_oob.s_oob.comp_tcp_csum = 1;
372 			pkg.tx_oob.s_oob.trans_off = skb_transport_offset(skb);
373 
374 		} else if (csum_type == IPPROTO_UDP) {
375 			pkg.tx_oob.s_oob.is_outer_ipv4 = ipv4;
376 			pkg.tx_oob.s_oob.is_outer_ipv6 = ipv6;
377 
378 			pkg.tx_oob.s_oob.comp_udp_csum = 1;
379 		} else {
380 			/* Can't do offload of this type of checksum */
381 			if (skb_checksum_help(skb))
382 				goto tx_drop_count;
383 		}
384 	}
385 
386 	WARN_ON_ONCE(pkg.wqe_req.num_sge > MAX_TX_WQE_SGL_ENTRIES);
387 
388 	if (pkg.wqe_req.num_sge <= ARRAY_SIZE(pkg.sgl_array)) {
389 		pkg.wqe_req.sgl = pkg.sgl_array;
390 	} else {
391 		pkg.sgl_ptr = kmalloc_array(pkg.wqe_req.num_sge,
392 					    sizeof(struct gdma_sge),
393 					    GFP_ATOMIC);
394 		if (!pkg.sgl_ptr)
395 			goto tx_drop_count;
396 
397 		pkg.wqe_req.sgl = pkg.sgl_ptr;
398 	}
399 
400 	if (mana_map_skb(skb, apc, &pkg, gso_hs)) {
401 		u64_stats_update_begin(&tx_stats->syncp);
402 		tx_stats->mana_map_err++;
403 		u64_stats_update_end(&tx_stats->syncp);
404 		goto free_sgl_ptr;
405 	}
406 
407 	skb_queue_tail(&txq->pending_skbs, skb);
408 
409 	len = skb->len;
410 	net_txq = netdev_get_tx_queue(ndev, txq_idx);
411 
412 	err = mana_gd_post_work_request(gdma_sq, &pkg.wqe_req,
413 					(struct gdma_posted_wqe_info *)skb->cb);
414 	if (!mana_can_tx(gdma_sq)) {
415 		netif_tx_stop_queue(net_txq);
416 		apc->eth_stats.stop_queue++;
417 	}
418 
419 	if (err) {
420 		(void)skb_dequeue_tail(&txq->pending_skbs);
421 		netdev_warn(ndev, "Failed to post TX OOB: %d\n", err);
422 		err = NETDEV_TX_BUSY;
423 		goto tx_busy;
424 	}
425 
426 	err = NETDEV_TX_OK;
427 	atomic_inc(&txq->pending_sends);
428 
429 	mana_gd_wq_ring_doorbell(gd->gdma_context, gdma_sq);
430 
431 	/* skb may be freed after mana_gd_post_work_request. Do not use it. */
432 	skb = NULL;
433 
434 	tx_stats = &txq->stats;
435 	u64_stats_update_begin(&tx_stats->syncp);
436 	tx_stats->packets++;
437 	tx_stats->bytes += len;
438 	u64_stats_update_end(&tx_stats->syncp);
439 
440 tx_busy:
441 	if (netif_tx_queue_stopped(net_txq) && mana_can_tx(gdma_sq)) {
442 		netif_tx_wake_queue(net_txq);
443 		apc->eth_stats.wake_queue++;
444 	}
445 
446 	kfree(pkg.sgl_ptr);
447 	return err;
448 
449 free_sgl_ptr:
450 	kfree(pkg.sgl_ptr);
451 tx_drop_count:
452 	ndev->stats.tx_dropped++;
453 tx_drop:
454 	dev_kfree_skb_any(skb);
455 	return NETDEV_TX_OK;
456 }
457 
mana_get_stats64(struct net_device * ndev,struct rtnl_link_stats64 * st)458 static void mana_get_stats64(struct net_device *ndev,
459 			     struct rtnl_link_stats64 *st)
460 {
461 	struct mana_port_context *apc = netdev_priv(ndev);
462 	unsigned int num_queues = apc->num_queues;
463 	struct mana_stats_rx *rx_stats;
464 	struct mana_stats_tx *tx_stats;
465 	unsigned int start;
466 	u64 packets, bytes;
467 	int q;
468 
469 	if (!apc->port_is_up)
470 		return;
471 
472 	netdev_stats_to_stats64(st, &ndev->stats);
473 
474 	for (q = 0; q < num_queues; q++) {
475 		rx_stats = &apc->rxqs[q]->stats;
476 
477 		do {
478 			start = u64_stats_fetch_begin(&rx_stats->syncp);
479 			packets = rx_stats->packets;
480 			bytes = rx_stats->bytes;
481 		} while (u64_stats_fetch_retry(&rx_stats->syncp, start));
482 
483 		st->rx_packets += packets;
484 		st->rx_bytes += bytes;
485 	}
486 
487 	for (q = 0; q < num_queues; q++) {
488 		tx_stats = &apc->tx_qp[q].txq.stats;
489 
490 		do {
491 			start = u64_stats_fetch_begin(&tx_stats->syncp);
492 			packets = tx_stats->packets;
493 			bytes = tx_stats->bytes;
494 		} while (u64_stats_fetch_retry(&tx_stats->syncp, start));
495 
496 		st->tx_packets += packets;
497 		st->tx_bytes += bytes;
498 	}
499 }
500 
mana_get_tx_queue(struct net_device * ndev,struct sk_buff * skb,int old_q)501 static int mana_get_tx_queue(struct net_device *ndev, struct sk_buff *skb,
502 			     int old_q)
503 {
504 	struct mana_port_context *apc = netdev_priv(ndev);
505 	u32 hash = skb_get_hash(skb);
506 	struct sock *sk = skb->sk;
507 	int txq;
508 
509 	txq = apc->indir_table[hash & (apc->indir_table_sz - 1)];
510 
511 	if (txq != old_q && sk && sk_fullsock(sk) &&
512 	    rcu_access_pointer(sk->sk_dst_cache))
513 		sk_tx_queue_set(sk, txq);
514 
515 	return txq;
516 }
517 
mana_select_queue(struct net_device * ndev,struct sk_buff * skb,struct net_device * sb_dev)518 static u16 mana_select_queue(struct net_device *ndev, struct sk_buff *skb,
519 			     struct net_device *sb_dev)
520 {
521 	int txq;
522 
523 	if (ndev->real_num_tx_queues == 1)
524 		return 0;
525 
526 	txq = sk_tx_queue_get(skb->sk);
527 
528 	if (txq < 0 || skb->ooo_okay || txq >= ndev->real_num_tx_queues) {
529 		if (skb_rx_queue_recorded(skb))
530 			txq = skb_get_rx_queue(skb);
531 		else
532 			txq = mana_get_tx_queue(ndev, skb, txq);
533 	}
534 
535 	return txq;
536 }
537 
538 /* Release pre-allocated RX buffers */
mana_pre_dealloc_rxbufs(struct mana_port_context * mpc)539 void mana_pre_dealloc_rxbufs(struct mana_port_context *mpc)
540 {
541 	struct device *dev;
542 	int i;
543 
544 	dev = mpc->ac->gdma_dev->gdma_context->dev;
545 
546 	if (!mpc->rxbufs_pre)
547 		goto out1;
548 
549 	if (!mpc->das_pre)
550 		goto out2;
551 
552 	while (mpc->rxbpre_total) {
553 		i = --mpc->rxbpre_total;
554 		dma_unmap_single(dev, mpc->das_pre[i], mpc->rxbpre_datasize,
555 				 DMA_FROM_DEVICE);
556 		put_page(virt_to_head_page(mpc->rxbufs_pre[i]));
557 	}
558 
559 	kfree(mpc->das_pre);
560 	mpc->das_pre = NULL;
561 
562 out2:
563 	kfree(mpc->rxbufs_pre);
564 	mpc->rxbufs_pre = NULL;
565 
566 out1:
567 	mpc->rxbpre_datasize = 0;
568 	mpc->rxbpre_alloc_size = 0;
569 	mpc->rxbpre_headroom = 0;
570 }
571 
572 /* Get a buffer from the pre-allocated RX buffers */
mana_get_rxbuf_pre(struct mana_rxq * rxq,dma_addr_t * da)573 static void *mana_get_rxbuf_pre(struct mana_rxq *rxq, dma_addr_t *da)
574 {
575 	struct net_device *ndev = rxq->ndev;
576 	struct mana_port_context *mpc;
577 	void *va;
578 
579 	mpc = netdev_priv(ndev);
580 
581 	if (!mpc->rxbufs_pre || !mpc->das_pre || !mpc->rxbpre_total) {
582 		netdev_err(ndev, "No RX pre-allocated bufs\n");
583 		return NULL;
584 	}
585 
586 	/* Check sizes to catch unexpected coding error */
587 	if (mpc->rxbpre_datasize != rxq->datasize) {
588 		netdev_err(ndev, "rxbpre_datasize mismatch: %u: %u\n",
589 			   mpc->rxbpre_datasize, rxq->datasize);
590 		return NULL;
591 	}
592 
593 	if (mpc->rxbpre_alloc_size != rxq->alloc_size) {
594 		netdev_err(ndev, "rxbpre_alloc_size mismatch: %u: %u\n",
595 			   mpc->rxbpre_alloc_size, rxq->alloc_size);
596 		return NULL;
597 	}
598 
599 	if (mpc->rxbpre_headroom != rxq->headroom) {
600 		netdev_err(ndev, "rxbpre_headroom mismatch: %u: %u\n",
601 			   mpc->rxbpre_headroom, rxq->headroom);
602 		return NULL;
603 	}
604 
605 	mpc->rxbpre_total--;
606 
607 	*da = mpc->das_pre[mpc->rxbpre_total];
608 	va = mpc->rxbufs_pre[mpc->rxbpre_total];
609 	mpc->rxbufs_pre[mpc->rxbpre_total] = NULL;
610 
611 	/* Deallocate the array after all buffers are gone */
612 	if (!mpc->rxbpre_total)
613 		mana_pre_dealloc_rxbufs(mpc);
614 
615 	return va;
616 }
617 
618 /* Get RX buffer's data size, alloc size, XDP headroom based on MTU */
mana_get_rxbuf_cfg(int mtu,u32 * datasize,u32 * alloc_size,u32 * headroom)619 static void mana_get_rxbuf_cfg(int mtu, u32 *datasize, u32 *alloc_size,
620 			       u32 *headroom)
621 {
622 	if (mtu > MANA_XDP_MTU_MAX)
623 		*headroom = 0; /* no support for XDP */
624 	else
625 		*headroom = XDP_PACKET_HEADROOM;
626 
627 	*alloc_size = SKB_DATA_ALIGN(mtu + MANA_RXBUF_PAD + *headroom);
628 
629 	/* Using page pool in this case, so alloc_size is PAGE_SIZE */
630 	if (*alloc_size < PAGE_SIZE)
631 		*alloc_size = PAGE_SIZE;
632 
633 	*datasize = mtu + ETH_HLEN;
634 }
635 
mana_pre_alloc_rxbufs(struct mana_port_context * mpc,int new_mtu,int num_queues)636 int mana_pre_alloc_rxbufs(struct mana_port_context *mpc, int new_mtu, int num_queues)
637 {
638 	struct device *dev;
639 	struct page *page;
640 	dma_addr_t da;
641 	int num_rxb;
642 	void *va;
643 	int i;
644 
645 	mana_get_rxbuf_cfg(new_mtu, &mpc->rxbpre_datasize,
646 			   &mpc->rxbpre_alloc_size, &mpc->rxbpre_headroom);
647 
648 	dev = mpc->ac->gdma_dev->gdma_context->dev;
649 
650 	num_rxb = num_queues * mpc->rx_queue_size;
651 
652 	WARN(mpc->rxbufs_pre, "mana rxbufs_pre exists\n");
653 	mpc->rxbufs_pre = kmalloc_array(num_rxb, sizeof(void *), GFP_KERNEL);
654 	if (!mpc->rxbufs_pre)
655 		goto error;
656 
657 	mpc->das_pre = kmalloc_array(num_rxb, sizeof(dma_addr_t), GFP_KERNEL);
658 	if (!mpc->das_pre)
659 		goto error;
660 
661 	mpc->rxbpre_total = 0;
662 
663 	for (i = 0; i < num_rxb; i++) {
664 		page = dev_alloc_pages(get_order(mpc->rxbpre_alloc_size));
665 		if (!page)
666 			goto error;
667 
668 		va = page_to_virt(page);
669 
670 		da = dma_map_single(dev, va + mpc->rxbpre_headroom,
671 				    mpc->rxbpre_datasize, DMA_FROM_DEVICE);
672 		if (dma_mapping_error(dev, da)) {
673 			put_page(page);
674 			goto error;
675 		}
676 
677 		mpc->rxbufs_pre[i] = va;
678 		mpc->das_pre[i] = da;
679 		mpc->rxbpre_total = i + 1;
680 	}
681 
682 	return 0;
683 
684 error:
685 	netdev_err(mpc->ndev, "Failed to pre-allocate RX buffers for %d queues\n", num_queues);
686 	mana_pre_dealloc_rxbufs(mpc);
687 	return -ENOMEM;
688 }
689 
mana_change_mtu(struct net_device * ndev,int new_mtu)690 static int mana_change_mtu(struct net_device *ndev, int new_mtu)
691 {
692 	struct mana_port_context *mpc = netdev_priv(ndev);
693 	unsigned int old_mtu = ndev->mtu;
694 	int err;
695 
696 	/* Pre-allocate buffers to prevent failure in mana_attach later */
697 	err = mana_pre_alloc_rxbufs(mpc, new_mtu, mpc->num_queues);
698 	if (err) {
699 		netdev_err(ndev, "Insufficient memory for new MTU\n");
700 		return err;
701 	}
702 
703 	err = mana_detach(ndev, false);
704 	if (err) {
705 		netdev_err(ndev, "mana_detach failed: %d\n", err);
706 		goto out;
707 	}
708 
709 	WRITE_ONCE(ndev->mtu, new_mtu);
710 
711 	err = mana_attach(ndev);
712 	if (err) {
713 		netdev_err(ndev, "mana_attach failed: %d\n", err);
714 		WRITE_ONCE(ndev->mtu, old_mtu);
715 	}
716 
717 out:
718 	mana_pre_dealloc_rxbufs(mpc);
719 	return err;
720 }
721 
722 static const struct net_device_ops mana_devops = {
723 	.ndo_open		= mana_open,
724 	.ndo_stop		= mana_close,
725 	.ndo_select_queue	= mana_select_queue,
726 	.ndo_start_xmit		= mana_start_xmit,
727 	.ndo_validate_addr	= eth_validate_addr,
728 	.ndo_get_stats64	= mana_get_stats64,
729 	.ndo_bpf		= mana_bpf,
730 	.ndo_xdp_xmit		= mana_xdp_xmit,
731 	.ndo_change_mtu		= mana_change_mtu,
732 };
733 
mana_cleanup_port_context(struct mana_port_context * apc)734 static void mana_cleanup_port_context(struct mana_port_context *apc)
735 {
736 	/*
737 	 * make sure subsequent cleanup attempts don't end up removing already
738 	 * cleaned dentry pointer
739 	 */
740 	debugfs_remove(apc->mana_port_debugfs);
741 	apc->mana_port_debugfs = NULL;
742 	kfree(apc->rxqs);
743 	apc->rxqs = NULL;
744 }
745 
mana_cleanup_indir_table(struct mana_port_context * apc)746 static void mana_cleanup_indir_table(struct mana_port_context *apc)
747 {
748 	apc->indir_table_sz = 0;
749 	kfree(apc->indir_table);
750 	kfree(apc->rxobj_table);
751 }
752 
mana_init_port_context(struct mana_port_context * apc)753 static int mana_init_port_context(struct mana_port_context *apc)
754 {
755 	apc->rxqs = kcalloc(apc->num_queues, sizeof(struct mana_rxq *),
756 			    GFP_KERNEL);
757 
758 	return !apc->rxqs ? -ENOMEM : 0;
759 }
760 
mana_send_request(struct mana_context * ac,void * in_buf,u32 in_len,void * out_buf,u32 out_len)761 static int mana_send_request(struct mana_context *ac, void *in_buf,
762 			     u32 in_len, void *out_buf, u32 out_len)
763 {
764 	struct gdma_context *gc = ac->gdma_dev->gdma_context;
765 	struct gdma_resp_hdr *resp = out_buf;
766 	struct gdma_req_hdr *req = in_buf;
767 	struct device *dev = gc->dev;
768 	static atomic_t activity_id;
769 	int err;
770 
771 	req->dev_id = gc->mana.dev_id;
772 	req->activity_id = atomic_inc_return(&activity_id);
773 
774 	err = mana_gd_send_request(gc, in_len, in_buf, out_len,
775 				   out_buf);
776 	if (err || resp->status) {
777 		dev_err(dev, "Failed to send mana message: %d, 0x%x\n",
778 			err, resp->status);
779 		return err ? err : -EPROTO;
780 	}
781 
782 	if (req->dev_id.as_uint32 != resp->dev_id.as_uint32 ||
783 	    req->activity_id != resp->activity_id) {
784 		dev_err(dev, "Unexpected mana message response: %x,%x,%x,%x\n",
785 			req->dev_id.as_uint32, resp->dev_id.as_uint32,
786 			req->activity_id, resp->activity_id);
787 		return -EPROTO;
788 	}
789 
790 	return 0;
791 }
792 
mana_verify_resp_hdr(const struct gdma_resp_hdr * resp_hdr,const enum mana_command_code expected_code,const u32 min_size)793 static int mana_verify_resp_hdr(const struct gdma_resp_hdr *resp_hdr,
794 				const enum mana_command_code expected_code,
795 				const u32 min_size)
796 {
797 	if (resp_hdr->response.msg_type != expected_code)
798 		return -EPROTO;
799 
800 	if (resp_hdr->response.msg_version < GDMA_MESSAGE_V1)
801 		return -EPROTO;
802 
803 	if (resp_hdr->response.msg_size < min_size)
804 		return -EPROTO;
805 
806 	return 0;
807 }
808 
mana_pf_register_hw_vport(struct mana_port_context * apc)809 static int mana_pf_register_hw_vport(struct mana_port_context *apc)
810 {
811 	struct mana_register_hw_vport_resp resp = {};
812 	struct mana_register_hw_vport_req req = {};
813 	int err;
814 
815 	mana_gd_init_req_hdr(&req.hdr, MANA_REGISTER_HW_PORT,
816 			     sizeof(req), sizeof(resp));
817 	req.attached_gfid = 1;
818 	req.is_pf_default_vport = 1;
819 	req.allow_all_ether_types = 1;
820 
821 	err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
822 				sizeof(resp));
823 	if (err) {
824 		netdev_err(apc->ndev, "Failed to register hw vPort: %d\n", err);
825 		return err;
826 	}
827 
828 	err = mana_verify_resp_hdr(&resp.hdr, MANA_REGISTER_HW_PORT,
829 				   sizeof(resp));
830 	if (err || resp.hdr.status) {
831 		netdev_err(apc->ndev, "Failed to register hw vPort: %d, 0x%x\n",
832 			   err, resp.hdr.status);
833 		return err ? err : -EPROTO;
834 	}
835 
836 	apc->port_handle = resp.hw_vport_handle;
837 	return 0;
838 }
839 
mana_pf_deregister_hw_vport(struct mana_port_context * apc)840 static void mana_pf_deregister_hw_vport(struct mana_port_context *apc)
841 {
842 	struct mana_deregister_hw_vport_resp resp = {};
843 	struct mana_deregister_hw_vport_req req = {};
844 	int err;
845 
846 	mana_gd_init_req_hdr(&req.hdr, MANA_DEREGISTER_HW_PORT,
847 			     sizeof(req), sizeof(resp));
848 	req.hw_vport_handle = apc->port_handle;
849 
850 	err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
851 				sizeof(resp));
852 	if (err) {
853 		netdev_err(apc->ndev, "Failed to unregister hw vPort: %d\n",
854 			   err);
855 		return;
856 	}
857 
858 	err = mana_verify_resp_hdr(&resp.hdr, MANA_DEREGISTER_HW_PORT,
859 				   sizeof(resp));
860 	if (err || resp.hdr.status)
861 		netdev_err(apc->ndev,
862 			   "Failed to deregister hw vPort: %d, 0x%x\n",
863 			   err, resp.hdr.status);
864 }
865 
mana_pf_register_filter(struct mana_port_context * apc)866 static int mana_pf_register_filter(struct mana_port_context *apc)
867 {
868 	struct mana_register_filter_resp resp = {};
869 	struct mana_register_filter_req req = {};
870 	int err;
871 
872 	mana_gd_init_req_hdr(&req.hdr, MANA_REGISTER_FILTER,
873 			     sizeof(req), sizeof(resp));
874 	req.vport = apc->port_handle;
875 	memcpy(req.mac_addr, apc->mac_addr, ETH_ALEN);
876 
877 	err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
878 				sizeof(resp));
879 	if (err) {
880 		netdev_err(apc->ndev, "Failed to register filter: %d\n", err);
881 		return err;
882 	}
883 
884 	err = mana_verify_resp_hdr(&resp.hdr, MANA_REGISTER_FILTER,
885 				   sizeof(resp));
886 	if (err || resp.hdr.status) {
887 		netdev_err(apc->ndev, "Failed to register filter: %d, 0x%x\n",
888 			   err, resp.hdr.status);
889 		return err ? err : -EPROTO;
890 	}
891 
892 	apc->pf_filter_handle = resp.filter_handle;
893 	return 0;
894 }
895 
mana_pf_deregister_filter(struct mana_port_context * apc)896 static void mana_pf_deregister_filter(struct mana_port_context *apc)
897 {
898 	struct mana_deregister_filter_resp resp = {};
899 	struct mana_deregister_filter_req req = {};
900 	int err;
901 
902 	mana_gd_init_req_hdr(&req.hdr, MANA_DEREGISTER_FILTER,
903 			     sizeof(req), sizeof(resp));
904 	req.filter_handle = apc->pf_filter_handle;
905 
906 	err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
907 				sizeof(resp));
908 	if (err) {
909 		netdev_err(apc->ndev, "Failed to unregister filter: %d\n",
910 			   err);
911 		return;
912 	}
913 
914 	err = mana_verify_resp_hdr(&resp.hdr, MANA_DEREGISTER_FILTER,
915 				   sizeof(resp));
916 	if (err || resp.hdr.status)
917 		netdev_err(apc->ndev,
918 			   "Failed to deregister filter: %d, 0x%x\n",
919 			   err, resp.hdr.status);
920 }
921 
mana_query_device_cfg(struct mana_context * ac,u32 proto_major_ver,u32 proto_minor_ver,u32 proto_micro_ver,u16 * max_num_vports)922 static int mana_query_device_cfg(struct mana_context *ac, u32 proto_major_ver,
923 				 u32 proto_minor_ver, u32 proto_micro_ver,
924 				 u16 *max_num_vports)
925 {
926 	struct gdma_context *gc = ac->gdma_dev->gdma_context;
927 	struct mana_query_device_cfg_resp resp = {};
928 	struct mana_query_device_cfg_req req = {};
929 	struct device *dev = gc->dev;
930 	int err = 0;
931 
932 	mana_gd_init_req_hdr(&req.hdr, MANA_QUERY_DEV_CONFIG,
933 			     sizeof(req), sizeof(resp));
934 
935 	req.hdr.resp.msg_version = GDMA_MESSAGE_V2;
936 
937 	req.proto_major_ver = proto_major_ver;
938 	req.proto_minor_ver = proto_minor_ver;
939 	req.proto_micro_ver = proto_micro_ver;
940 
941 	err = mana_send_request(ac, &req, sizeof(req), &resp, sizeof(resp));
942 	if (err) {
943 		dev_err(dev, "Failed to query config: %d", err);
944 		return err;
945 	}
946 
947 	err = mana_verify_resp_hdr(&resp.hdr, MANA_QUERY_DEV_CONFIG,
948 				   sizeof(resp));
949 	if (err || resp.hdr.status) {
950 		dev_err(dev, "Invalid query result: %d, 0x%x\n", err,
951 			resp.hdr.status);
952 		if (!err)
953 			err = -EPROTO;
954 		return err;
955 	}
956 
957 	*max_num_vports = resp.max_num_vports;
958 
959 	if (resp.hdr.response.msg_version == GDMA_MESSAGE_V2)
960 		gc->adapter_mtu = resp.adapter_mtu;
961 	else
962 		gc->adapter_mtu = ETH_FRAME_LEN;
963 
964 	debugfs_create_u16("adapter-MTU", 0400, gc->mana_pci_debugfs, &gc->adapter_mtu);
965 
966 	return 0;
967 }
968 
mana_query_vport_cfg(struct mana_port_context * apc,u32 vport_index,u32 * max_sq,u32 * max_rq,u32 * num_indir_entry)969 static int mana_query_vport_cfg(struct mana_port_context *apc, u32 vport_index,
970 				u32 *max_sq, u32 *max_rq, u32 *num_indir_entry)
971 {
972 	struct mana_query_vport_cfg_resp resp = {};
973 	struct mana_query_vport_cfg_req req = {};
974 	int err;
975 
976 	mana_gd_init_req_hdr(&req.hdr, MANA_QUERY_VPORT_CONFIG,
977 			     sizeof(req), sizeof(resp));
978 
979 	req.vport_index = vport_index;
980 
981 	err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
982 				sizeof(resp));
983 	if (err)
984 		return err;
985 
986 	err = mana_verify_resp_hdr(&resp.hdr, MANA_QUERY_VPORT_CONFIG,
987 				   sizeof(resp));
988 	if (err)
989 		return err;
990 
991 	if (resp.hdr.status)
992 		return -EPROTO;
993 
994 	*max_sq = resp.max_num_sq;
995 	*max_rq = resp.max_num_rq;
996 	if (resp.num_indirection_ent > 0 &&
997 	    resp.num_indirection_ent <= MANA_INDIRECT_TABLE_MAX_SIZE &&
998 	    is_power_of_2(resp.num_indirection_ent)) {
999 		*num_indir_entry = resp.num_indirection_ent;
1000 	} else {
1001 		netdev_warn(apc->ndev,
1002 			    "Setting indirection table size to default %d for vPort %d\n",
1003 			    MANA_INDIRECT_TABLE_DEF_SIZE, apc->port_idx);
1004 		*num_indir_entry = MANA_INDIRECT_TABLE_DEF_SIZE;
1005 	}
1006 
1007 	apc->port_handle = resp.vport;
1008 	ether_addr_copy(apc->mac_addr, resp.mac_addr);
1009 
1010 	return 0;
1011 }
1012 
mana_uncfg_vport(struct mana_port_context * apc)1013 void mana_uncfg_vport(struct mana_port_context *apc)
1014 {
1015 	mutex_lock(&apc->vport_mutex);
1016 	apc->vport_use_count--;
1017 	WARN_ON(apc->vport_use_count < 0);
1018 	mutex_unlock(&apc->vport_mutex);
1019 }
1020 EXPORT_SYMBOL_NS(mana_uncfg_vport, "NET_MANA");
1021 
mana_cfg_vport(struct mana_port_context * apc,u32 protection_dom_id,u32 doorbell_pg_id)1022 int mana_cfg_vport(struct mana_port_context *apc, u32 protection_dom_id,
1023 		   u32 doorbell_pg_id)
1024 {
1025 	struct mana_config_vport_resp resp = {};
1026 	struct mana_config_vport_req req = {};
1027 	int err;
1028 
1029 	/* This function is used to program the Ethernet port in the hardware
1030 	 * table. It can be called from the Ethernet driver or the RDMA driver.
1031 	 *
1032 	 * For Ethernet usage, the hardware supports only one active user on a
1033 	 * physical port. The driver checks on the port usage before programming
1034 	 * the hardware when creating the RAW QP (RDMA driver) or exposing the
1035 	 * device to kernel NET layer (Ethernet driver).
1036 	 *
1037 	 * Because the RDMA driver doesn't know in advance which QP type the
1038 	 * user will create, it exposes the device with all its ports. The user
1039 	 * may not be able to create RAW QP on a port if this port is already
1040 	 * in used by the Ethernet driver from the kernel.
1041 	 *
1042 	 * This physical port limitation only applies to the RAW QP. For RC QP,
1043 	 * the hardware doesn't have this limitation. The user can create RC
1044 	 * QPs on a physical port up to the hardware limits independent of the
1045 	 * Ethernet usage on the same port.
1046 	 */
1047 	mutex_lock(&apc->vport_mutex);
1048 	if (apc->vport_use_count > 0) {
1049 		mutex_unlock(&apc->vport_mutex);
1050 		return -EBUSY;
1051 	}
1052 	apc->vport_use_count++;
1053 	mutex_unlock(&apc->vport_mutex);
1054 
1055 	mana_gd_init_req_hdr(&req.hdr, MANA_CONFIG_VPORT_TX,
1056 			     sizeof(req), sizeof(resp));
1057 	req.vport = apc->port_handle;
1058 	req.pdid = protection_dom_id;
1059 	req.doorbell_pageid = doorbell_pg_id;
1060 
1061 	err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
1062 				sizeof(resp));
1063 	if (err) {
1064 		netdev_err(apc->ndev, "Failed to configure vPort: %d\n", err);
1065 		goto out;
1066 	}
1067 
1068 	err = mana_verify_resp_hdr(&resp.hdr, MANA_CONFIG_VPORT_TX,
1069 				   sizeof(resp));
1070 	if (err || resp.hdr.status) {
1071 		netdev_err(apc->ndev, "Failed to configure vPort: %d, 0x%x\n",
1072 			   err, resp.hdr.status);
1073 		if (!err)
1074 			err = -EPROTO;
1075 
1076 		goto out;
1077 	}
1078 
1079 	apc->tx_shortform_allowed = resp.short_form_allowed;
1080 	apc->tx_vp_offset = resp.tx_vport_offset;
1081 
1082 	netdev_info(apc->ndev, "Configured vPort %llu PD %u DB %u\n",
1083 		    apc->port_handle, protection_dom_id, doorbell_pg_id);
1084 out:
1085 	if (err)
1086 		mana_uncfg_vport(apc);
1087 
1088 	return err;
1089 }
1090 EXPORT_SYMBOL_NS(mana_cfg_vport, "NET_MANA");
1091 
mana_cfg_vport_steering(struct mana_port_context * apc,enum TRI_STATE rx,bool update_default_rxobj,bool update_key,bool update_tab)1092 static int mana_cfg_vport_steering(struct mana_port_context *apc,
1093 				   enum TRI_STATE rx,
1094 				   bool update_default_rxobj, bool update_key,
1095 				   bool update_tab)
1096 {
1097 	struct mana_cfg_rx_steer_req_v2 *req;
1098 	struct mana_cfg_rx_steer_resp resp = {};
1099 	struct net_device *ndev = apc->ndev;
1100 	u32 req_buf_size;
1101 	int err;
1102 
1103 	req_buf_size = struct_size(req, indir_tab, apc->indir_table_sz);
1104 	req = kzalloc(req_buf_size, GFP_KERNEL);
1105 	if (!req)
1106 		return -ENOMEM;
1107 
1108 	mana_gd_init_req_hdr(&req->hdr, MANA_CONFIG_VPORT_RX, req_buf_size,
1109 			     sizeof(resp));
1110 
1111 	req->hdr.req.msg_version = GDMA_MESSAGE_V2;
1112 
1113 	req->vport = apc->port_handle;
1114 	req->num_indir_entries = apc->indir_table_sz;
1115 	req->indir_tab_offset = offsetof(struct mana_cfg_rx_steer_req_v2,
1116 					 indir_tab);
1117 	req->rx_enable = rx;
1118 	req->rss_enable = apc->rss_state;
1119 	req->update_default_rxobj = update_default_rxobj;
1120 	req->update_hashkey = update_key;
1121 	req->update_indir_tab = update_tab;
1122 	req->default_rxobj = apc->default_rxobj;
1123 	req->cqe_coalescing_enable = 0;
1124 
1125 	if (update_key)
1126 		memcpy(&req->hashkey, apc->hashkey, MANA_HASH_KEY_SIZE);
1127 
1128 	if (update_tab)
1129 		memcpy(req->indir_tab, apc->rxobj_table,
1130 		       flex_array_size(req, indir_tab, req->num_indir_entries));
1131 
1132 	err = mana_send_request(apc->ac, req, req_buf_size, &resp,
1133 				sizeof(resp));
1134 	if (err) {
1135 		netdev_err(ndev, "Failed to configure vPort RX: %d\n", err);
1136 		goto out;
1137 	}
1138 
1139 	err = mana_verify_resp_hdr(&resp.hdr, MANA_CONFIG_VPORT_RX,
1140 				   sizeof(resp));
1141 	if (err) {
1142 		netdev_err(ndev, "vPort RX configuration failed: %d\n", err);
1143 		goto out;
1144 	}
1145 
1146 	if (resp.hdr.status) {
1147 		netdev_err(ndev, "vPort RX configuration failed: 0x%x\n",
1148 			   resp.hdr.status);
1149 		err = -EPROTO;
1150 	}
1151 
1152 	netdev_info(ndev, "Configured steering vPort %llu entries %u\n",
1153 		    apc->port_handle, apc->indir_table_sz);
1154 out:
1155 	kfree(req);
1156 	return err;
1157 }
1158 
mana_create_wq_obj(struct mana_port_context * apc,mana_handle_t vport,u32 wq_type,struct mana_obj_spec * wq_spec,struct mana_obj_spec * cq_spec,mana_handle_t * wq_obj)1159 int mana_create_wq_obj(struct mana_port_context *apc,
1160 		       mana_handle_t vport,
1161 		       u32 wq_type, struct mana_obj_spec *wq_spec,
1162 		       struct mana_obj_spec *cq_spec,
1163 		       mana_handle_t *wq_obj)
1164 {
1165 	struct mana_create_wqobj_resp resp = {};
1166 	struct mana_create_wqobj_req req = {};
1167 	struct net_device *ndev = apc->ndev;
1168 	int err;
1169 
1170 	mana_gd_init_req_hdr(&req.hdr, MANA_CREATE_WQ_OBJ,
1171 			     sizeof(req), sizeof(resp));
1172 	req.vport = vport;
1173 	req.wq_type = wq_type;
1174 	req.wq_gdma_region = wq_spec->gdma_region;
1175 	req.cq_gdma_region = cq_spec->gdma_region;
1176 	req.wq_size = wq_spec->queue_size;
1177 	req.cq_size = cq_spec->queue_size;
1178 	req.cq_moderation_ctx_id = cq_spec->modr_ctx_id;
1179 	req.cq_parent_qid = cq_spec->attached_eq;
1180 
1181 	err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
1182 				sizeof(resp));
1183 	if (err) {
1184 		netdev_err(ndev, "Failed to create WQ object: %d\n", err);
1185 		goto out;
1186 	}
1187 
1188 	err = mana_verify_resp_hdr(&resp.hdr, MANA_CREATE_WQ_OBJ,
1189 				   sizeof(resp));
1190 	if (err || resp.hdr.status) {
1191 		netdev_err(ndev, "Failed to create WQ object: %d, 0x%x\n", err,
1192 			   resp.hdr.status);
1193 		if (!err)
1194 			err = -EPROTO;
1195 		goto out;
1196 	}
1197 
1198 	if (resp.wq_obj == INVALID_MANA_HANDLE) {
1199 		netdev_err(ndev, "Got an invalid WQ object handle\n");
1200 		err = -EPROTO;
1201 		goto out;
1202 	}
1203 
1204 	*wq_obj = resp.wq_obj;
1205 	wq_spec->queue_index = resp.wq_id;
1206 	cq_spec->queue_index = resp.cq_id;
1207 
1208 	return 0;
1209 out:
1210 	return err;
1211 }
1212 EXPORT_SYMBOL_NS(mana_create_wq_obj, "NET_MANA");
1213 
mana_destroy_wq_obj(struct mana_port_context * apc,u32 wq_type,mana_handle_t wq_obj)1214 void mana_destroy_wq_obj(struct mana_port_context *apc, u32 wq_type,
1215 			 mana_handle_t wq_obj)
1216 {
1217 	struct mana_destroy_wqobj_resp resp = {};
1218 	struct mana_destroy_wqobj_req req = {};
1219 	struct net_device *ndev = apc->ndev;
1220 	int err;
1221 
1222 	mana_gd_init_req_hdr(&req.hdr, MANA_DESTROY_WQ_OBJ,
1223 			     sizeof(req), sizeof(resp));
1224 	req.wq_type = wq_type;
1225 	req.wq_obj_handle = wq_obj;
1226 
1227 	err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
1228 				sizeof(resp));
1229 	if (err) {
1230 		netdev_err(ndev, "Failed to destroy WQ object: %d\n", err);
1231 		return;
1232 	}
1233 
1234 	err = mana_verify_resp_hdr(&resp.hdr, MANA_DESTROY_WQ_OBJ,
1235 				   sizeof(resp));
1236 	if (err || resp.hdr.status)
1237 		netdev_err(ndev, "Failed to destroy WQ object: %d, 0x%x\n", err,
1238 			   resp.hdr.status);
1239 }
1240 EXPORT_SYMBOL_NS(mana_destroy_wq_obj, "NET_MANA");
1241 
mana_destroy_eq(struct mana_context * ac)1242 static void mana_destroy_eq(struct mana_context *ac)
1243 {
1244 	struct gdma_context *gc = ac->gdma_dev->gdma_context;
1245 	struct gdma_queue *eq;
1246 	int i;
1247 
1248 	if (!ac->eqs)
1249 		return;
1250 
1251 	debugfs_remove_recursive(ac->mana_eqs_debugfs);
1252 	ac->mana_eqs_debugfs = NULL;
1253 
1254 	for (i = 0; i < gc->max_num_queues; i++) {
1255 		eq = ac->eqs[i].eq;
1256 		if (!eq)
1257 			continue;
1258 
1259 		mana_gd_destroy_queue(gc, eq);
1260 	}
1261 
1262 	kfree(ac->eqs);
1263 	ac->eqs = NULL;
1264 }
1265 
mana_create_eq_debugfs(struct mana_context * ac,int i)1266 static void mana_create_eq_debugfs(struct mana_context *ac, int i)
1267 {
1268 	struct mana_eq eq = ac->eqs[i];
1269 	char eqnum[32];
1270 
1271 	sprintf(eqnum, "eq%d", i);
1272 	eq.mana_eq_debugfs = debugfs_create_dir(eqnum, ac->mana_eqs_debugfs);
1273 	debugfs_create_u32("head", 0400, eq.mana_eq_debugfs, &eq.eq->head);
1274 	debugfs_create_u32("tail", 0400, eq.mana_eq_debugfs, &eq.eq->tail);
1275 	debugfs_create_file("eq_dump", 0400, eq.mana_eq_debugfs, eq.eq, &mana_dbg_q_fops);
1276 }
1277 
mana_create_eq(struct mana_context * ac)1278 static int mana_create_eq(struct mana_context *ac)
1279 {
1280 	struct gdma_dev *gd = ac->gdma_dev;
1281 	struct gdma_context *gc = gd->gdma_context;
1282 	struct gdma_queue_spec spec = {};
1283 	int err;
1284 	int i;
1285 
1286 	ac->eqs = kcalloc(gc->max_num_queues, sizeof(struct mana_eq),
1287 			  GFP_KERNEL);
1288 	if (!ac->eqs)
1289 		return -ENOMEM;
1290 
1291 	spec.type = GDMA_EQ;
1292 	spec.monitor_avl_buf = false;
1293 	spec.queue_size = EQ_SIZE;
1294 	spec.eq.callback = NULL;
1295 	spec.eq.context = ac->eqs;
1296 	spec.eq.log2_throttle_limit = LOG2_EQ_THROTTLE;
1297 
1298 	ac->mana_eqs_debugfs = debugfs_create_dir("EQs", gc->mana_pci_debugfs);
1299 
1300 	for (i = 0; i < gc->max_num_queues; i++) {
1301 		spec.eq.msix_index = (i + 1) % gc->num_msix_usable;
1302 		err = mana_gd_create_mana_eq(gd, &spec, &ac->eqs[i].eq);
1303 		if (err) {
1304 			dev_err(gc->dev, "Failed to create EQ %d : %d\n", i, err);
1305 			goto out;
1306 		}
1307 		mana_create_eq_debugfs(ac, i);
1308 	}
1309 
1310 	return 0;
1311 out:
1312 	mana_destroy_eq(ac);
1313 	return err;
1314 }
1315 
mana_fence_rq(struct mana_port_context * apc,struct mana_rxq * rxq)1316 static int mana_fence_rq(struct mana_port_context *apc, struct mana_rxq *rxq)
1317 {
1318 	struct mana_fence_rq_resp resp = {};
1319 	struct mana_fence_rq_req req = {};
1320 	int err;
1321 
1322 	init_completion(&rxq->fence_event);
1323 
1324 	mana_gd_init_req_hdr(&req.hdr, MANA_FENCE_RQ,
1325 			     sizeof(req), sizeof(resp));
1326 	req.wq_obj_handle =  rxq->rxobj;
1327 
1328 	err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
1329 				sizeof(resp));
1330 	if (err) {
1331 		netdev_err(apc->ndev, "Failed to fence RQ %u: %d\n",
1332 			   rxq->rxq_idx, err);
1333 		return err;
1334 	}
1335 
1336 	err = mana_verify_resp_hdr(&resp.hdr, MANA_FENCE_RQ, sizeof(resp));
1337 	if (err || resp.hdr.status) {
1338 		netdev_err(apc->ndev, "Failed to fence RQ %u: %d, 0x%x\n",
1339 			   rxq->rxq_idx, err, resp.hdr.status);
1340 		if (!err)
1341 			err = -EPROTO;
1342 
1343 		return err;
1344 	}
1345 
1346 	if (wait_for_completion_timeout(&rxq->fence_event, 10 * HZ) == 0) {
1347 		netdev_err(apc->ndev, "Failed to fence RQ %u: timed out\n",
1348 			   rxq->rxq_idx);
1349 		return -ETIMEDOUT;
1350 	}
1351 
1352 	return 0;
1353 }
1354 
mana_fence_rqs(struct mana_port_context * apc)1355 static void mana_fence_rqs(struct mana_port_context *apc)
1356 {
1357 	unsigned int rxq_idx;
1358 	struct mana_rxq *rxq;
1359 	int err;
1360 
1361 	for (rxq_idx = 0; rxq_idx < apc->num_queues; rxq_idx++) {
1362 		rxq = apc->rxqs[rxq_idx];
1363 		err = mana_fence_rq(apc, rxq);
1364 
1365 		/* In case of any error, use sleep instead. */
1366 		if (err)
1367 			msleep(100);
1368 	}
1369 }
1370 
mana_move_wq_tail(struct gdma_queue * wq,u32 num_units)1371 static int mana_move_wq_tail(struct gdma_queue *wq, u32 num_units)
1372 {
1373 	u32 used_space_old;
1374 	u32 used_space_new;
1375 
1376 	used_space_old = wq->head - wq->tail;
1377 	used_space_new = wq->head - (wq->tail + num_units);
1378 
1379 	if (WARN_ON_ONCE(used_space_new > used_space_old))
1380 		return -ERANGE;
1381 
1382 	wq->tail += num_units;
1383 	return 0;
1384 }
1385 
mana_unmap_skb(struct sk_buff * skb,struct mana_port_context * apc)1386 static void mana_unmap_skb(struct sk_buff *skb, struct mana_port_context *apc)
1387 {
1388 	struct mana_skb_head *ash = (struct mana_skb_head *)skb->head;
1389 	struct gdma_context *gc = apc->ac->gdma_dev->gdma_context;
1390 	struct device *dev = gc->dev;
1391 	int hsg, i;
1392 
1393 	/* Number of SGEs of linear part */
1394 	hsg = (skb_is_gso(skb) && skb_headlen(skb) > ash->size[0]) ? 2 : 1;
1395 
1396 	for (i = 0; i < hsg; i++)
1397 		dma_unmap_single(dev, ash->dma_handle[i], ash->size[i],
1398 				 DMA_TO_DEVICE);
1399 
1400 	for (i = hsg; i < skb_shinfo(skb)->nr_frags + hsg; i++)
1401 		dma_unmap_page(dev, ash->dma_handle[i], ash->size[i],
1402 			       DMA_TO_DEVICE);
1403 }
1404 
mana_poll_tx_cq(struct mana_cq * cq)1405 static void mana_poll_tx_cq(struct mana_cq *cq)
1406 {
1407 	struct gdma_comp *completions = cq->gdma_comp_buf;
1408 	struct gdma_posted_wqe_info *wqe_info;
1409 	unsigned int pkt_transmitted = 0;
1410 	unsigned int wqe_unit_cnt = 0;
1411 	struct mana_txq *txq = cq->txq;
1412 	struct mana_port_context *apc;
1413 	struct netdev_queue *net_txq;
1414 	struct gdma_queue *gdma_wq;
1415 	unsigned int avail_space;
1416 	struct net_device *ndev;
1417 	struct sk_buff *skb;
1418 	bool txq_stopped;
1419 	int comp_read;
1420 	int i;
1421 
1422 	ndev = txq->ndev;
1423 	apc = netdev_priv(ndev);
1424 
1425 	comp_read = mana_gd_poll_cq(cq->gdma_cq, completions,
1426 				    CQE_POLLING_BUFFER);
1427 
1428 	if (comp_read < 1)
1429 		return;
1430 
1431 	for (i = 0; i < comp_read; i++) {
1432 		struct mana_tx_comp_oob *cqe_oob;
1433 
1434 		if (WARN_ON_ONCE(!completions[i].is_sq))
1435 			return;
1436 
1437 		cqe_oob = (struct mana_tx_comp_oob *)completions[i].cqe_data;
1438 		if (WARN_ON_ONCE(cqe_oob->cqe_hdr.client_type !=
1439 				 MANA_CQE_COMPLETION))
1440 			return;
1441 
1442 		switch (cqe_oob->cqe_hdr.cqe_type) {
1443 		case CQE_TX_OKAY:
1444 			break;
1445 
1446 		case CQE_TX_SA_DROP:
1447 		case CQE_TX_MTU_DROP:
1448 		case CQE_TX_INVALID_OOB:
1449 		case CQE_TX_INVALID_ETH_TYPE:
1450 		case CQE_TX_HDR_PROCESSING_ERROR:
1451 		case CQE_TX_VF_DISABLED:
1452 		case CQE_TX_VPORT_IDX_OUT_OF_RANGE:
1453 		case CQE_TX_VPORT_DISABLED:
1454 		case CQE_TX_VLAN_TAGGING_VIOLATION:
1455 			if (net_ratelimit())
1456 				netdev_err(ndev, "TX: CQE error %d\n",
1457 					   cqe_oob->cqe_hdr.cqe_type);
1458 
1459 			apc->eth_stats.tx_cqe_err++;
1460 			break;
1461 
1462 		default:
1463 			/* If the CQE type is unknown, log an error,
1464 			 * and still free the SKB, update tail, etc.
1465 			 */
1466 			if (net_ratelimit())
1467 				netdev_err(ndev, "TX: unknown CQE type %d\n",
1468 					   cqe_oob->cqe_hdr.cqe_type);
1469 
1470 			apc->eth_stats.tx_cqe_unknown_type++;
1471 			break;
1472 		}
1473 
1474 		if (WARN_ON_ONCE(txq->gdma_txq_id != completions[i].wq_num))
1475 			return;
1476 
1477 		skb = skb_dequeue(&txq->pending_skbs);
1478 		if (WARN_ON_ONCE(!skb))
1479 			return;
1480 
1481 		wqe_info = (struct gdma_posted_wqe_info *)skb->cb;
1482 		wqe_unit_cnt += wqe_info->wqe_size_in_bu;
1483 
1484 		mana_unmap_skb(skb, apc);
1485 
1486 		napi_consume_skb(skb, cq->budget);
1487 
1488 		pkt_transmitted++;
1489 	}
1490 
1491 	if (WARN_ON_ONCE(wqe_unit_cnt == 0))
1492 		return;
1493 
1494 	mana_move_wq_tail(txq->gdma_sq, wqe_unit_cnt);
1495 
1496 	gdma_wq = txq->gdma_sq;
1497 	avail_space = mana_gd_wq_avail_space(gdma_wq);
1498 
1499 	/* Ensure tail updated before checking q stop */
1500 	smp_mb();
1501 
1502 	net_txq = txq->net_txq;
1503 	txq_stopped = netif_tx_queue_stopped(net_txq);
1504 
1505 	/* Ensure checking txq_stopped before apc->port_is_up. */
1506 	smp_rmb();
1507 
1508 	if (txq_stopped && apc->port_is_up && avail_space >= MAX_TX_WQE_SIZE) {
1509 		netif_tx_wake_queue(net_txq);
1510 		apc->eth_stats.wake_queue++;
1511 	}
1512 
1513 	if (atomic_sub_return(pkt_transmitted, &txq->pending_sends) < 0)
1514 		WARN_ON_ONCE(1);
1515 
1516 	cq->work_done = pkt_transmitted;
1517 }
1518 
mana_post_pkt_rxq(struct mana_rxq * rxq)1519 static void mana_post_pkt_rxq(struct mana_rxq *rxq)
1520 {
1521 	struct mana_recv_buf_oob *recv_buf_oob;
1522 	u32 curr_index;
1523 	int err;
1524 
1525 	curr_index = rxq->buf_index++;
1526 	if (rxq->buf_index == rxq->num_rx_buf)
1527 		rxq->buf_index = 0;
1528 
1529 	recv_buf_oob = &rxq->rx_oobs[curr_index];
1530 
1531 	err = mana_gd_post_work_request(rxq->gdma_rq, &recv_buf_oob->wqe_req,
1532 					&recv_buf_oob->wqe_inf);
1533 	if (WARN_ON_ONCE(err))
1534 		return;
1535 
1536 	WARN_ON_ONCE(recv_buf_oob->wqe_inf.wqe_size_in_bu != 1);
1537 }
1538 
mana_build_skb(struct mana_rxq * rxq,void * buf_va,uint pkt_len,struct xdp_buff * xdp)1539 static struct sk_buff *mana_build_skb(struct mana_rxq *rxq, void *buf_va,
1540 				      uint pkt_len, struct xdp_buff *xdp)
1541 {
1542 	struct sk_buff *skb = napi_build_skb(buf_va, rxq->alloc_size);
1543 
1544 	if (!skb)
1545 		return NULL;
1546 
1547 	if (xdp->data_hard_start) {
1548 		u32 metasize = xdp->data - xdp->data_meta;
1549 
1550 		skb_reserve(skb, xdp->data - xdp->data_hard_start);
1551 		skb_put(skb, xdp->data_end - xdp->data);
1552 		if (metasize)
1553 			skb_metadata_set(skb, metasize);
1554 		return skb;
1555 	}
1556 
1557 	skb_reserve(skb, rxq->headroom);
1558 	skb_put(skb, pkt_len);
1559 
1560 	return skb;
1561 }
1562 
mana_rx_skb(void * buf_va,bool from_pool,struct mana_rxcomp_oob * cqe,struct mana_rxq * rxq)1563 static void mana_rx_skb(void *buf_va, bool from_pool,
1564 			struct mana_rxcomp_oob *cqe, struct mana_rxq *rxq)
1565 {
1566 	struct mana_stats_rx *rx_stats = &rxq->stats;
1567 	struct net_device *ndev = rxq->ndev;
1568 	uint pkt_len = cqe->ppi[0].pkt_len;
1569 	u16 rxq_idx = rxq->rxq_idx;
1570 	struct napi_struct *napi;
1571 	struct xdp_buff xdp = {};
1572 	struct sk_buff *skb;
1573 	u32 hash_value;
1574 	u32 act;
1575 
1576 	rxq->rx_cq.work_done++;
1577 	napi = &rxq->rx_cq.napi;
1578 
1579 	if (!buf_va) {
1580 		++ndev->stats.rx_dropped;
1581 		return;
1582 	}
1583 
1584 	act = mana_run_xdp(ndev, rxq, &xdp, buf_va, pkt_len);
1585 
1586 	if (act == XDP_REDIRECT && !rxq->xdp_rc)
1587 		return;
1588 
1589 	if (act != XDP_PASS && act != XDP_TX)
1590 		goto drop_xdp;
1591 
1592 	skb = mana_build_skb(rxq, buf_va, pkt_len, &xdp);
1593 
1594 	if (!skb)
1595 		goto drop;
1596 
1597 	if (from_pool)
1598 		skb_mark_for_recycle(skb);
1599 
1600 	skb->dev = napi->dev;
1601 
1602 	skb->protocol = eth_type_trans(skb, ndev);
1603 	skb_checksum_none_assert(skb);
1604 	skb_record_rx_queue(skb, rxq_idx);
1605 
1606 	if ((ndev->features & NETIF_F_RXCSUM) && cqe->rx_iphdr_csum_succeed) {
1607 		if (cqe->rx_tcp_csum_succeed || cqe->rx_udp_csum_succeed)
1608 			skb->ip_summed = CHECKSUM_UNNECESSARY;
1609 	}
1610 
1611 	if (cqe->rx_hashtype != 0 && (ndev->features & NETIF_F_RXHASH)) {
1612 		hash_value = cqe->ppi[0].pkt_hash;
1613 
1614 		if (cqe->rx_hashtype & MANA_HASH_L4)
1615 			skb_set_hash(skb, hash_value, PKT_HASH_TYPE_L4);
1616 		else
1617 			skb_set_hash(skb, hash_value, PKT_HASH_TYPE_L3);
1618 	}
1619 
1620 	if (cqe->rx_vlantag_present) {
1621 		u16 vlan_tci = cqe->rx_vlan_id;
1622 
1623 		__vlan_hwaccel_put_tag(skb, htons(ETH_P_8021Q), vlan_tci);
1624 	}
1625 
1626 	u64_stats_update_begin(&rx_stats->syncp);
1627 	rx_stats->packets++;
1628 	rx_stats->bytes += pkt_len;
1629 
1630 	if (act == XDP_TX)
1631 		rx_stats->xdp_tx++;
1632 	u64_stats_update_end(&rx_stats->syncp);
1633 
1634 	if (act == XDP_TX) {
1635 		skb_set_queue_mapping(skb, rxq_idx);
1636 		mana_xdp_tx(skb, ndev);
1637 		return;
1638 	}
1639 
1640 	napi_gro_receive(napi, skb);
1641 
1642 	return;
1643 
1644 drop_xdp:
1645 	u64_stats_update_begin(&rx_stats->syncp);
1646 	rx_stats->xdp_drop++;
1647 	u64_stats_update_end(&rx_stats->syncp);
1648 
1649 drop:
1650 	if (from_pool) {
1651 		page_pool_recycle_direct(rxq->page_pool,
1652 					 virt_to_head_page(buf_va));
1653 	} else {
1654 		WARN_ON_ONCE(rxq->xdp_save_va);
1655 		/* Save for reuse */
1656 		rxq->xdp_save_va = buf_va;
1657 	}
1658 
1659 	++ndev->stats.rx_dropped;
1660 
1661 	return;
1662 }
1663 
mana_get_rxfrag(struct mana_rxq * rxq,struct device * dev,dma_addr_t * da,bool * from_pool)1664 static void *mana_get_rxfrag(struct mana_rxq *rxq, struct device *dev,
1665 			     dma_addr_t *da, bool *from_pool)
1666 {
1667 	struct page *page;
1668 	void *va;
1669 
1670 	*from_pool = false;
1671 
1672 	/* Reuse XDP dropped page if available */
1673 	if (rxq->xdp_save_va) {
1674 		va = rxq->xdp_save_va;
1675 		rxq->xdp_save_va = NULL;
1676 	} else {
1677 		page = page_pool_dev_alloc_pages(rxq->page_pool);
1678 		if (!page)
1679 			return NULL;
1680 
1681 		*from_pool = true;
1682 		va = page_to_virt(page);
1683 	}
1684 
1685 	*da = dma_map_single(dev, va + rxq->headroom, rxq->datasize,
1686 			     DMA_FROM_DEVICE);
1687 	if (dma_mapping_error(dev, *da)) {
1688 		if (*from_pool)
1689 			page_pool_put_full_page(rxq->page_pool, page, false);
1690 		else
1691 			put_page(virt_to_head_page(va));
1692 
1693 		return NULL;
1694 	}
1695 
1696 	return va;
1697 }
1698 
1699 /* Allocate frag for rx buffer, and save the old buf */
mana_refill_rx_oob(struct device * dev,struct mana_rxq * rxq,struct mana_recv_buf_oob * rxoob,void ** old_buf,bool * old_fp)1700 static void mana_refill_rx_oob(struct device *dev, struct mana_rxq *rxq,
1701 			       struct mana_recv_buf_oob *rxoob, void **old_buf,
1702 			       bool *old_fp)
1703 {
1704 	bool from_pool;
1705 	dma_addr_t da;
1706 	void *va;
1707 
1708 	va = mana_get_rxfrag(rxq, dev, &da, &from_pool);
1709 	if (!va)
1710 		return;
1711 
1712 	dma_unmap_single(dev, rxoob->sgl[0].address, rxq->datasize,
1713 			 DMA_FROM_DEVICE);
1714 	*old_buf = rxoob->buf_va;
1715 	*old_fp = rxoob->from_pool;
1716 
1717 	rxoob->buf_va = va;
1718 	rxoob->sgl[0].address = da;
1719 	rxoob->from_pool = from_pool;
1720 }
1721 
mana_process_rx_cqe(struct mana_rxq * rxq,struct mana_cq * cq,struct gdma_comp * cqe)1722 static void mana_process_rx_cqe(struct mana_rxq *rxq, struct mana_cq *cq,
1723 				struct gdma_comp *cqe)
1724 {
1725 	struct mana_rxcomp_oob *oob = (struct mana_rxcomp_oob *)cqe->cqe_data;
1726 	struct gdma_context *gc = rxq->gdma_rq->gdma_dev->gdma_context;
1727 	struct net_device *ndev = rxq->ndev;
1728 	struct mana_recv_buf_oob *rxbuf_oob;
1729 	struct mana_port_context *apc;
1730 	struct device *dev = gc->dev;
1731 	void *old_buf = NULL;
1732 	u32 curr, pktlen;
1733 	bool old_fp;
1734 
1735 	apc = netdev_priv(ndev);
1736 
1737 	switch (oob->cqe_hdr.cqe_type) {
1738 	case CQE_RX_OKAY:
1739 		break;
1740 
1741 	case CQE_RX_TRUNCATED:
1742 		++ndev->stats.rx_dropped;
1743 		rxbuf_oob = &rxq->rx_oobs[rxq->buf_index];
1744 		netdev_warn_once(ndev, "Dropped a truncated packet\n");
1745 		goto drop;
1746 
1747 	case CQE_RX_COALESCED_4:
1748 		netdev_err(ndev, "RX coalescing is unsupported\n");
1749 		apc->eth_stats.rx_coalesced_err++;
1750 		return;
1751 
1752 	case CQE_RX_OBJECT_FENCE:
1753 		complete(&rxq->fence_event);
1754 		return;
1755 
1756 	default:
1757 		netdev_err(ndev, "Unknown RX CQE type = %d\n",
1758 			   oob->cqe_hdr.cqe_type);
1759 		apc->eth_stats.rx_cqe_unknown_type++;
1760 		return;
1761 	}
1762 
1763 	pktlen = oob->ppi[0].pkt_len;
1764 
1765 	if (pktlen == 0) {
1766 		/* data packets should never have packetlength of zero */
1767 		netdev_err(ndev, "RX pkt len=0, rq=%u, cq=%u, rxobj=0x%llx\n",
1768 			   rxq->gdma_id, cq->gdma_id, rxq->rxobj);
1769 		return;
1770 	}
1771 
1772 	curr = rxq->buf_index;
1773 	rxbuf_oob = &rxq->rx_oobs[curr];
1774 	WARN_ON_ONCE(rxbuf_oob->wqe_inf.wqe_size_in_bu != 1);
1775 
1776 	mana_refill_rx_oob(dev, rxq, rxbuf_oob, &old_buf, &old_fp);
1777 
1778 	/* Unsuccessful refill will have old_buf == NULL.
1779 	 * In this case, mana_rx_skb() will drop the packet.
1780 	 */
1781 	mana_rx_skb(old_buf, old_fp, oob, rxq);
1782 
1783 drop:
1784 	mana_move_wq_tail(rxq->gdma_rq, rxbuf_oob->wqe_inf.wqe_size_in_bu);
1785 
1786 	mana_post_pkt_rxq(rxq);
1787 }
1788 
mana_poll_rx_cq(struct mana_cq * cq)1789 static void mana_poll_rx_cq(struct mana_cq *cq)
1790 {
1791 	struct gdma_comp *comp = cq->gdma_comp_buf;
1792 	struct mana_rxq *rxq = cq->rxq;
1793 	int comp_read, i;
1794 
1795 	comp_read = mana_gd_poll_cq(cq->gdma_cq, comp, CQE_POLLING_BUFFER);
1796 	WARN_ON_ONCE(comp_read > CQE_POLLING_BUFFER);
1797 
1798 	rxq->xdp_flush = false;
1799 
1800 	for (i = 0; i < comp_read; i++) {
1801 		if (WARN_ON_ONCE(comp[i].is_sq))
1802 			return;
1803 
1804 		/* verify recv cqe references the right rxq */
1805 		if (WARN_ON_ONCE(comp[i].wq_num != cq->rxq->gdma_id))
1806 			return;
1807 
1808 		mana_process_rx_cqe(rxq, cq, &comp[i]);
1809 	}
1810 
1811 	if (comp_read > 0) {
1812 		struct gdma_context *gc = rxq->gdma_rq->gdma_dev->gdma_context;
1813 
1814 		mana_gd_wq_ring_doorbell(gc, rxq->gdma_rq);
1815 	}
1816 
1817 	if (rxq->xdp_flush)
1818 		xdp_do_flush();
1819 }
1820 
mana_cq_handler(void * context,struct gdma_queue * gdma_queue)1821 static int mana_cq_handler(void *context, struct gdma_queue *gdma_queue)
1822 {
1823 	struct mana_cq *cq = context;
1824 	int w;
1825 
1826 	WARN_ON_ONCE(cq->gdma_cq != gdma_queue);
1827 
1828 	if (cq->type == MANA_CQ_TYPE_RX)
1829 		mana_poll_rx_cq(cq);
1830 	else
1831 		mana_poll_tx_cq(cq);
1832 
1833 	w = cq->work_done;
1834 	cq->work_done_since_doorbell += w;
1835 
1836 	if (w < cq->budget) {
1837 		mana_gd_ring_cq(gdma_queue, SET_ARM_BIT);
1838 		cq->work_done_since_doorbell = 0;
1839 		napi_complete_done(&cq->napi, w);
1840 	} else if (cq->work_done_since_doorbell >
1841 		   cq->gdma_cq->queue_size / COMP_ENTRY_SIZE * 4) {
1842 		/* MANA hardware requires at least one doorbell ring every 8
1843 		 * wraparounds of CQ even if there is no need to arm the CQ.
1844 		 * This driver rings the doorbell as soon as we have exceeded
1845 		 * 4 wraparounds.
1846 		 */
1847 		mana_gd_ring_cq(gdma_queue, 0);
1848 		cq->work_done_since_doorbell = 0;
1849 	}
1850 
1851 	return w;
1852 }
1853 
mana_poll(struct napi_struct * napi,int budget)1854 static int mana_poll(struct napi_struct *napi, int budget)
1855 {
1856 	struct mana_cq *cq = container_of(napi, struct mana_cq, napi);
1857 	int w;
1858 
1859 	cq->work_done = 0;
1860 	cq->budget = budget;
1861 
1862 	w = mana_cq_handler(cq, cq->gdma_cq);
1863 
1864 	return min(w, budget);
1865 }
1866 
mana_schedule_napi(void * context,struct gdma_queue * gdma_queue)1867 static void mana_schedule_napi(void *context, struct gdma_queue *gdma_queue)
1868 {
1869 	struct mana_cq *cq = context;
1870 
1871 	napi_schedule_irqoff(&cq->napi);
1872 }
1873 
mana_deinit_cq(struct mana_port_context * apc,struct mana_cq * cq)1874 static void mana_deinit_cq(struct mana_port_context *apc, struct mana_cq *cq)
1875 {
1876 	struct gdma_dev *gd = apc->ac->gdma_dev;
1877 
1878 	if (!cq->gdma_cq)
1879 		return;
1880 
1881 	mana_gd_destroy_queue(gd->gdma_context, cq->gdma_cq);
1882 }
1883 
mana_deinit_txq(struct mana_port_context * apc,struct mana_txq * txq)1884 static void mana_deinit_txq(struct mana_port_context *apc, struct mana_txq *txq)
1885 {
1886 	struct gdma_dev *gd = apc->ac->gdma_dev;
1887 
1888 	if (!txq->gdma_sq)
1889 		return;
1890 
1891 	mana_gd_destroy_queue(gd->gdma_context, txq->gdma_sq);
1892 }
1893 
mana_destroy_txq(struct mana_port_context * apc)1894 static void mana_destroy_txq(struct mana_port_context *apc)
1895 {
1896 	struct napi_struct *napi;
1897 	int i;
1898 
1899 	if (!apc->tx_qp)
1900 		return;
1901 
1902 	for (i = 0; i < apc->num_queues; i++) {
1903 		debugfs_remove_recursive(apc->tx_qp[i].mana_tx_debugfs);
1904 		apc->tx_qp[i].mana_tx_debugfs = NULL;
1905 
1906 		napi = &apc->tx_qp[i].tx_cq.napi;
1907 		if (apc->tx_qp[i].txq.napi_initialized) {
1908 			napi_synchronize(napi);
1909 			napi_disable(napi);
1910 			netif_napi_del(napi);
1911 			apc->tx_qp[i].txq.napi_initialized = false;
1912 		}
1913 		mana_destroy_wq_obj(apc, GDMA_SQ, apc->tx_qp[i].tx_object);
1914 
1915 		mana_deinit_cq(apc, &apc->tx_qp[i].tx_cq);
1916 
1917 		mana_deinit_txq(apc, &apc->tx_qp[i].txq);
1918 	}
1919 
1920 	kfree(apc->tx_qp);
1921 	apc->tx_qp = NULL;
1922 }
1923 
mana_create_txq_debugfs(struct mana_port_context * apc,int idx)1924 static void mana_create_txq_debugfs(struct mana_port_context *apc, int idx)
1925 {
1926 	struct mana_tx_qp *tx_qp = &apc->tx_qp[idx];
1927 	char qnum[32];
1928 
1929 	sprintf(qnum, "TX-%d", idx);
1930 	tx_qp->mana_tx_debugfs = debugfs_create_dir(qnum, apc->mana_port_debugfs);
1931 	debugfs_create_u32("sq_head", 0400, tx_qp->mana_tx_debugfs,
1932 			   &tx_qp->txq.gdma_sq->head);
1933 	debugfs_create_u32("sq_tail", 0400, tx_qp->mana_tx_debugfs,
1934 			   &tx_qp->txq.gdma_sq->tail);
1935 	debugfs_create_u32("sq_pend_skb_qlen", 0400, tx_qp->mana_tx_debugfs,
1936 			   &tx_qp->txq.pending_skbs.qlen);
1937 	debugfs_create_u32("cq_head", 0400, tx_qp->mana_tx_debugfs,
1938 			   &tx_qp->tx_cq.gdma_cq->head);
1939 	debugfs_create_u32("cq_tail", 0400, tx_qp->mana_tx_debugfs,
1940 			   &tx_qp->tx_cq.gdma_cq->tail);
1941 	debugfs_create_u32("cq_budget", 0400, tx_qp->mana_tx_debugfs,
1942 			   &tx_qp->tx_cq.budget);
1943 	debugfs_create_file("txq_dump", 0400, tx_qp->mana_tx_debugfs,
1944 			    tx_qp->txq.gdma_sq, &mana_dbg_q_fops);
1945 	debugfs_create_file("cq_dump", 0400, tx_qp->mana_tx_debugfs,
1946 			    tx_qp->tx_cq.gdma_cq, &mana_dbg_q_fops);
1947 }
1948 
mana_create_txq(struct mana_port_context * apc,struct net_device * net)1949 static int mana_create_txq(struct mana_port_context *apc,
1950 			   struct net_device *net)
1951 {
1952 	struct mana_context *ac = apc->ac;
1953 	struct gdma_dev *gd = ac->gdma_dev;
1954 	struct mana_obj_spec wq_spec;
1955 	struct mana_obj_spec cq_spec;
1956 	struct gdma_queue_spec spec;
1957 	struct gdma_context *gc;
1958 	struct mana_txq *txq;
1959 	struct mana_cq *cq;
1960 	u32 txq_size;
1961 	u32 cq_size;
1962 	int err;
1963 	int i;
1964 
1965 	apc->tx_qp = kcalloc(apc->num_queues, sizeof(struct mana_tx_qp),
1966 			     GFP_KERNEL);
1967 	if (!apc->tx_qp)
1968 		return -ENOMEM;
1969 
1970 	/*  The minimum size of the WQE is 32 bytes, hence
1971 	 *  apc->tx_queue_size represents the maximum number of WQEs
1972 	 *  the SQ can store. This value is then used to size other queues
1973 	 *  to prevent overflow.
1974 	 *  Also note that the txq_size is always going to be MANA_PAGE_ALIGNED,
1975 	 *  as min val of apc->tx_queue_size is 128 and that would make
1976 	 *  txq_size 128*32 = 4096 and the other higher values of apc->tx_queue_size
1977 	 *  are always power of two
1978 	 */
1979 	txq_size = apc->tx_queue_size * 32;
1980 
1981 	cq_size = apc->tx_queue_size * COMP_ENTRY_SIZE;
1982 
1983 	gc = gd->gdma_context;
1984 
1985 	for (i = 0; i < apc->num_queues; i++) {
1986 		apc->tx_qp[i].tx_object = INVALID_MANA_HANDLE;
1987 
1988 		/* Create SQ */
1989 		txq = &apc->tx_qp[i].txq;
1990 
1991 		u64_stats_init(&txq->stats.syncp);
1992 		txq->ndev = net;
1993 		txq->net_txq = netdev_get_tx_queue(net, i);
1994 		txq->vp_offset = apc->tx_vp_offset;
1995 		txq->napi_initialized = false;
1996 		skb_queue_head_init(&txq->pending_skbs);
1997 
1998 		memset(&spec, 0, sizeof(spec));
1999 		spec.type = GDMA_SQ;
2000 		spec.monitor_avl_buf = true;
2001 		spec.queue_size = txq_size;
2002 		err = mana_gd_create_mana_wq_cq(gd, &spec, &txq->gdma_sq);
2003 		if (err)
2004 			goto out;
2005 
2006 		/* Create SQ's CQ */
2007 		cq = &apc->tx_qp[i].tx_cq;
2008 		cq->type = MANA_CQ_TYPE_TX;
2009 
2010 		cq->txq = txq;
2011 
2012 		memset(&spec, 0, sizeof(spec));
2013 		spec.type = GDMA_CQ;
2014 		spec.monitor_avl_buf = false;
2015 		spec.queue_size = cq_size;
2016 		spec.cq.callback = mana_schedule_napi;
2017 		spec.cq.parent_eq = ac->eqs[i].eq;
2018 		spec.cq.context = cq;
2019 		err = mana_gd_create_mana_wq_cq(gd, &spec, &cq->gdma_cq);
2020 		if (err)
2021 			goto out;
2022 
2023 		memset(&wq_spec, 0, sizeof(wq_spec));
2024 		memset(&cq_spec, 0, sizeof(cq_spec));
2025 
2026 		wq_spec.gdma_region = txq->gdma_sq->mem_info.dma_region_handle;
2027 		wq_spec.queue_size = txq->gdma_sq->queue_size;
2028 
2029 		cq_spec.gdma_region = cq->gdma_cq->mem_info.dma_region_handle;
2030 		cq_spec.queue_size = cq->gdma_cq->queue_size;
2031 		cq_spec.modr_ctx_id = 0;
2032 		cq_spec.attached_eq = cq->gdma_cq->cq.parent->id;
2033 
2034 		err = mana_create_wq_obj(apc, apc->port_handle, GDMA_SQ,
2035 					 &wq_spec, &cq_spec,
2036 					 &apc->tx_qp[i].tx_object);
2037 
2038 		if (err)
2039 			goto out;
2040 
2041 		txq->gdma_sq->id = wq_spec.queue_index;
2042 		cq->gdma_cq->id = cq_spec.queue_index;
2043 
2044 		txq->gdma_sq->mem_info.dma_region_handle =
2045 			GDMA_INVALID_DMA_REGION;
2046 		cq->gdma_cq->mem_info.dma_region_handle =
2047 			GDMA_INVALID_DMA_REGION;
2048 
2049 		txq->gdma_txq_id = txq->gdma_sq->id;
2050 
2051 		cq->gdma_id = cq->gdma_cq->id;
2052 
2053 		if (WARN_ON(cq->gdma_id >= gc->max_num_cqs)) {
2054 			err = -EINVAL;
2055 			goto out;
2056 		}
2057 
2058 		gc->cq_table[cq->gdma_id] = cq->gdma_cq;
2059 
2060 		mana_create_txq_debugfs(apc, i);
2061 
2062 		netif_napi_add_tx(net, &cq->napi, mana_poll);
2063 		napi_enable(&cq->napi);
2064 		txq->napi_initialized = true;
2065 
2066 		mana_gd_ring_cq(cq->gdma_cq, SET_ARM_BIT);
2067 	}
2068 
2069 	return 0;
2070 out:
2071 	netdev_err(net, "Failed to create %d TX queues, %d\n",
2072 		   apc->num_queues, err);
2073 	mana_destroy_txq(apc);
2074 	return err;
2075 }
2076 
mana_destroy_rxq(struct mana_port_context * apc,struct mana_rxq * rxq,bool napi_initialized)2077 static void mana_destroy_rxq(struct mana_port_context *apc,
2078 			     struct mana_rxq *rxq, bool napi_initialized)
2079 
2080 {
2081 	struct gdma_context *gc = apc->ac->gdma_dev->gdma_context;
2082 	struct mana_recv_buf_oob *rx_oob;
2083 	struct device *dev = gc->dev;
2084 	struct napi_struct *napi;
2085 	struct page *page;
2086 	int i;
2087 
2088 	if (!rxq)
2089 		return;
2090 
2091 	debugfs_remove_recursive(rxq->mana_rx_debugfs);
2092 	rxq->mana_rx_debugfs = NULL;
2093 
2094 	napi = &rxq->rx_cq.napi;
2095 
2096 	if (napi_initialized) {
2097 		napi_synchronize(napi);
2098 
2099 		napi_disable(napi);
2100 
2101 		netif_napi_del(napi);
2102 	}
2103 	xdp_rxq_info_unreg(&rxq->xdp_rxq);
2104 
2105 	mana_destroy_wq_obj(apc, GDMA_RQ, rxq->rxobj);
2106 
2107 	mana_deinit_cq(apc, &rxq->rx_cq);
2108 
2109 	if (rxq->xdp_save_va)
2110 		put_page(virt_to_head_page(rxq->xdp_save_va));
2111 
2112 	for (i = 0; i < rxq->num_rx_buf; i++) {
2113 		rx_oob = &rxq->rx_oobs[i];
2114 
2115 		if (!rx_oob->buf_va)
2116 			continue;
2117 
2118 		dma_unmap_single(dev, rx_oob->sgl[0].address,
2119 				 rx_oob->sgl[0].size, DMA_FROM_DEVICE);
2120 
2121 		page = virt_to_head_page(rx_oob->buf_va);
2122 
2123 		if (rx_oob->from_pool)
2124 			page_pool_put_full_page(rxq->page_pool, page, false);
2125 		else
2126 			put_page(page);
2127 
2128 		rx_oob->buf_va = NULL;
2129 	}
2130 
2131 	page_pool_destroy(rxq->page_pool);
2132 
2133 	if (rxq->gdma_rq)
2134 		mana_gd_destroy_queue(gc, rxq->gdma_rq);
2135 
2136 	kfree(rxq);
2137 }
2138 
mana_fill_rx_oob(struct mana_recv_buf_oob * rx_oob,u32 mem_key,struct mana_rxq * rxq,struct device * dev)2139 static int mana_fill_rx_oob(struct mana_recv_buf_oob *rx_oob, u32 mem_key,
2140 			    struct mana_rxq *rxq, struct device *dev)
2141 {
2142 	struct mana_port_context *mpc = netdev_priv(rxq->ndev);
2143 	bool from_pool = false;
2144 	dma_addr_t da;
2145 	void *va;
2146 
2147 	if (mpc->rxbufs_pre)
2148 		va = mana_get_rxbuf_pre(rxq, &da);
2149 	else
2150 		va = mana_get_rxfrag(rxq, dev, &da, &from_pool);
2151 
2152 	if (!va)
2153 		return -ENOMEM;
2154 
2155 	rx_oob->buf_va = va;
2156 	rx_oob->from_pool = from_pool;
2157 
2158 	rx_oob->sgl[0].address = da;
2159 	rx_oob->sgl[0].size = rxq->datasize;
2160 	rx_oob->sgl[0].mem_key = mem_key;
2161 
2162 	return 0;
2163 }
2164 
2165 #define MANA_WQE_HEADER_SIZE 16
2166 #define MANA_WQE_SGE_SIZE 16
2167 
mana_alloc_rx_wqe(struct mana_port_context * apc,struct mana_rxq * rxq,u32 * rxq_size,u32 * cq_size)2168 static int mana_alloc_rx_wqe(struct mana_port_context *apc,
2169 			     struct mana_rxq *rxq, u32 *rxq_size, u32 *cq_size)
2170 {
2171 	struct gdma_context *gc = apc->ac->gdma_dev->gdma_context;
2172 	struct mana_recv_buf_oob *rx_oob;
2173 	struct device *dev = gc->dev;
2174 	u32 buf_idx;
2175 	int ret;
2176 
2177 	WARN_ON(rxq->datasize == 0);
2178 
2179 	*rxq_size = 0;
2180 	*cq_size = 0;
2181 
2182 	for (buf_idx = 0; buf_idx < rxq->num_rx_buf; buf_idx++) {
2183 		rx_oob = &rxq->rx_oobs[buf_idx];
2184 		memset(rx_oob, 0, sizeof(*rx_oob));
2185 
2186 		rx_oob->num_sge = 1;
2187 
2188 		ret = mana_fill_rx_oob(rx_oob, apc->ac->gdma_dev->gpa_mkey, rxq,
2189 				       dev);
2190 		if (ret)
2191 			return ret;
2192 
2193 		rx_oob->wqe_req.sgl = rx_oob->sgl;
2194 		rx_oob->wqe_req.num_sge = rx_oob->num_sge;
2195 		rx_oob->wqe_req.inline_oob_size = 0;
2196 		rx_oob->wqe_req.inline_oob_data = NULL;
2197 		rx_oob->wqe_req.flags = 0;
2198 		rx_oob->wqe_req.client_data_unit = 0;
2199 
2200 		*rxq_size += ALIGN(MANA_WQE_HEADER_SIZE +
2201 				   MANA_WQE_SGE_SIZE * rx_oob->num_sge, 32);
2202 		*cq_size += COMP_ENTRY_SIZE;
2203 	}
2204 
2205 	return 0;
2206 }
2207 
mana_push_wqe(struct mana_rxq * rxq)2208 static int mana_push_wqe(struct mana_rxq *rxq)
2209 {
2210 	struct mana_recv_buf_oob *rx_oob;
2211 	u32 buf_idx;
2212 	int err;
2213 
2214 	for (buf_idx = 0; buf_idx < rxq->num_rx_buf; buf_idx++) {
2215 		rx_oob = &rxq->rx_oobs[buf_idx];
2216 
2217 		err = mana_gd_post_and_ring(rxq->gdma_rq, &rx_oob->wqe_req,
2218 					    &rx_oob->wqe_inf);
2219 		if (err)
2220 			return -ENOSPC;
2221 	}
2222 
2223 	return 0;
2224 }
2225 
mana_create_page_pool(struct mana_rxq * rxq,struct gdma_context * gc)2226 static int mana_create_page_pool(struct mana_rxq *rxq, struct gdma_context *gc)
2227 {
2228 	struct mana_port_context *mpc = netdev_priv(rxq->ndev);
2229 	struct page_pool_params pprm = {};
2230 	int ret;
2231 
2232 	pprm.pool_size = mpc->rx_queue_size;
2233 	pprm.nid = gc->numa_node;
2234 	pprm.napi = &rxq->rx_cq.napi;
2235 	pprm.netdev = rxq->ndev;
2236 	pprm.order = get_order(rxq->alloc_size);
2237 
2238 	rxq->page_pool = page_pool_create(&pprm);
2239 
2240 	if (IS_ERR(rxq->page_pool)) {
2241 		ret = PTR_ERR(rxq->page_pool);
2242 		rxq->page_pool = NULL;
2243 		return ret;
2244 	}
2245 
2246 	return 0;
2247 }
2248 
mana_create_rxq(struct mana_port_context * apc,u32 rxq_idx,struct mana_eq * eq,struct net_device * ndev)2249 static struct mana_rxq *mana_create_rxq(struct mana_port_context *apc,
2250 					u32 rxq_idx, struct mana_eq *eq,
2251 					struct net_device *ndev)
2252 {
2253 	struct gdma_dev *gd = apc->ac->gdma_dev;
2254 	struct mana_obj_spec wq_spec;
2255 	struct mana_obj_spec cq_spec;
2256 	struct gdma_queue_spec spec;
2257 	struct mana_cq *cq = NULL;
2258 	struct gdma_context *gc;
2259 	u32 cq_size, rq_size;
2260 	struct mana_rxq *rxq;
2261 	int err;
2262 
2263 	gc = gd->gdma_context;
2264 
2265 	rxq = kzalloc(struct_size(rxq, rx_oobs, apc->rx_queue_size),
2266 		      GFP_KERNEL);
2267 	if (!rxq)
2268 		return NULL;
2269 
2270 	rxq->ndev = ndev;
2271 	rxq->num_rx_buf = apc->rx_queue_size;
2272 	rxq->rxq_idx = rxq_idx;
2273 	rxq->rxobj = INVALID_MANA_HANDLE;
2274 
2275 	mana_get_rxbuf_cfg(ndev->mtu, &rxq->datasize, &rxq->alloc_size,
2276 			   &rxq->headroom);
2277 
2278 	/* Create page pool for RX queue */
2279 	err = mana_create_page_pool(rxq, gc);
2280 	if (err) {
2281 		netdev_err(ndev, "Create page pool err:%d\n", err);
2282 		goto out;
2283 	}
2284 
2285 	err = mana_alloc_rx_wqe(apc, rxq, &rq_size, &cq_size);
2286 	if (err)
2287 		goto out;
2288 
2289 	rq_size = MANA_PAGE_ALIGN(rq_size);
2290 	cq_size = MANA_PAGE_ALIGN(cq_size);
2291 
2292 	/* Create RQ */
2293 	memset(&spec, 0, sizeof(spec));
2294 	spec.type = GDMA_RQ;
2295 	spec.monitor_avl_buf = true;
2296 	spec.queue_size = rq_size;
2297 	err = mana_gd_create_mana_wq_cq(gd, &spec, &rxq->gdma_rq);
2298 	if (err)
2299 		goto out;
2300 
2301 	/* Create RQ's CQ */
2302 	cq = &rxq->rx_cq;
2303 	cq->type = MANA_CQ_TYPE_RX;
2304 	cq->rxq = rxq;
2305 
2306 	memset(&spec, 0, sizeof(spec));
2307 	spec.type = GDMA_CQ;
2308 	spec.monitor_avl_buf = false;
2309 	spec.queue_size = cq_size;
2310 	spec.cq.callback = mana_schedule_napi;
2311 	spec.cq.parent_eq = eq->eq;
2312 	spec.cq.context = cq;
2313 	err = mana_gd_create_mana_wq_cq(gd, &spec, &cq->gdma_cq);
2314 	if (err)
2315 		goto out;
2316 
2317 	memset(&wq_spec, 0, sizeof(wq_spec));
2318 	memset(&cq_spec, 0, sizeof(cq_spec));
2319 	wq_spec.gdma_region = rxq->gdma_rq->mem_info.dma_region_handle;
2320 	wq_spec.queue_size = rxq->gdma_rq->queue_size;
2321 
2322 	cq_spec.gdma_region = cq->gdma_cq->mem_info.dma_region_handle;
2323 	cq_spec.queue_size = cq->gdma_cq->queue_size;
2324 	cq_spec.modr_ctx_id = 0;
2325 	cq_spec.attached_eq = cq->gdma_cq->cq.parent->id;
2326 
2327 	err = mana_create_wq_obj(apc, apc->port_handle, GDMA_RQ,
2328 				 &wq_spec, &cq_spec, &rxq->rxobj);
2329 	if (err)
2330 		goto out;
2331 
2332 	rxq->gdma_rq->id = wq_spec.queue_index;
2333 	cq->gdma_cq->id = cq_spec.queue_index;
2334 
2335 	rxq->gdma_rq->mem_info.dma_region_handle = GDMA_INVALID_DMA_REGION;
2336 	cq->gdma_cq->mem_info.dma_region_handle = GDMA_INVALID_DMA_REGION;
2337 
2338 	rxq->gdma_id = rxq->gdma_rq->id;
2339 	cq->gdma_id = cq->gdma_cq->id;
2340 
2341 	err = mana_push_wqe(rxq);
2342 	if (err)
2343 		goto out;
2344 
2345 	if (WARN_ON(cq->gdma_id >= gc->max_num_cqs)) {
2346 		err = -EINVAL;
2347 		goto out;
2348 	}
2349 
2350 	gc->cq_table[cq->gdma_id] = cq->gdma_cq;
2351 
2352 	netif_napi_add_weight(ndev, &cq->napi, mana_poll, 1);
2353 
2354 	WARN_ON(xdp_rxq_info_reg(&rxq->xdp_rxq, ndev, rxq_idx,
2355 				 cq->napi.napi_id));
2356 	WARN_ON(xdp_rxq_info_reg_mem_model(&rxq->xdp_rxq, MEM_TYPE_PAGE_POOL,
2357 					   rxq->page_pool));
2358 
2359 	napi_enable(&cq->napi);
2360 
2361 	mana_gd_ring_cq(cq->gdma_cq, SET_ARM_BIT);
2362 out:
2363 	if (!err)
2364 		return rxq;
2365 
2366 	netdev_err(ndev, "Failed to create RXQ: err = %d\n", err);
2367 
2368 	mana_destroy_rxq(apc, rxq, false);
2369 
2370 	if (cq)
2371 		mana_deinit_cq(apc, cq);
2372 
2373 	return NULL;
2374 }
2375 
mana_create_rxq_debugfs(struct mana_port_context * apc,int idx)2376 static void mana_create_rxq_debugfs(struct mana_port_context *apc, int idx)
2377 {
2378 	struct mana_rxq *rxq;
2379 	char qnum[32];
2380 
2381 	rxq = apc->rxqs[idx];
2382 
2383 	sprintf(qnum, "RX-%d", idx);
2384 	rxq->mana_rx_debugfs = debugfs_create_dir(qnum, apc->mana_port_debugfs);
2385 	debugfs_create_u32("rq_head", 0400, rxq->mana_rx_debugfs, &rxq->gdma_rq->head);
2386 	debugfs_create_u32("rq_tail", 0400, rxq->mana_rx_debugfs, &rxq->gdma_rq->tail);
2387 	debugfs_create_u32("rq_nbuf", 0400, rxq->mana_rx_debugfs, &rxq->num_rx_buf);
2388 	debugfs_create_u32("cq_head", 0400, rxq->mana_rx_debugfs,
2389 			   &rxq->rx_cq.gdma_cq->head);
2390 	debugfs_create_u32("cq_tail", 0400, rxq->mana_rx_debugfs,
2391 			   &rxq->rx_cq.gdma_cq->tail);
2392 	debugfs_create_u32("cq_budget", 0400, rxq->mana_rx_debugfs, &rxq->rx_cq.budget);
2393 	debugfs_create_file("rxq_dump", 0400, rxq->mana_rx_debugfs, rxq->gdma_rq, &mana_dbg_q_fops);
2394 	debugfs_create_file("cq_dump", 0400, rxq->mana_rx_debugfs, rxq->rx_cq.gdma_cq,
2395 			    &mana_dbg_q_fops);
2396 }
2397 
mana_add_rx_queues(struct mana_port_context * apc,struct net_device * ndev)2398 static int mana_add_rx_queues(struct mana_port_context *apc,
2399 			      struct net_device *ndev)
2400 {
2401 	struct mana_context *ac = apc->ac;
2402 	struct mana_rxq *rxq;
2403 	int err = 0;
2404 	int i;
2405 
2406 	for (i = 0; i < apc->num_queues; i++) {
2407 		rxq = mana_create_rxq(apc, i, &ac->eqs[i], ndev);
2408 		if (!rxq) {
2409 			err = -ENOMEM;
2410 			netdev_err(ndev, "Failed to create rxq %d : %d\n", i, err);
2411 			goto out;
2412 		}
2413 
2414 		u64_stats_init(&rxq->stats.syncp);
2415 
2416 		apc->rxqs[i] = rxq;
2417 
2418 		mana_create_rxq_debugfs(apc, i);
2419 	}
2420 
2421 	apc->default_rxobj = apc->rxqs[0]->rxobj;
2422 out:
2423 	return err;
2424 }
2425 
mana_destroy_vport(struct mana_port_context * apc)2426 static void mana_destroy_vport(struct mana_port_context *apc)
2427 {
2428 	struct gdma_dev *gd = apc->ac->gdma_dev;
2429 	struct mana_rxq *rxq;
2430 	u32 rxq_idx;
2431 
2432 	for (rxq_idx = 0; rxq_idx < apc->num_queues; rxq_idx++) {
2433 		rxq = apc->rxqs[rxq_idx];
2434 		if (!rxq)
2435 			continue;
2436 
2437 		mana_destroy_rxq(apc, rxq, true);
2438 		apc->rxqs[rxq_idx] = NULL;
2439 	}
2440 
2441 	mana_destroy_txq(apc);
2442 	mana_uncfg_vport(apc);
2443 
2444 	if (gd->gdma_context->is_pf)
2445 		mana_pf_deregister_hw_vport(apc);
2446 }
2447 
mana_create_vport(struct mana_port_context * apc,struct net_device * net)2448 static int mana_create_vport(struct mana_port_context *apc,
2449 			     struct net_device *net)
2450 {
2451 	struct gdma_dev *gd = apc->ac->gdma_dev;
2452 	int err;
2453 
2454 	apc->default_rxobj = INVALID_MANA_HANDLE;
2455 
2456 	if (gd->gdma_context->is_pf) {
2457 		err = mana_pf_register_hw_vport(apc);
2458 		if (err)
2459 			return err;
2460 	}
2461 
2462 	err = mana_cfg_vport(apc, gd->pdid, gd->doorbell);
2463 	if (err)
2464 		return err;
2465 
2466 	return mana_create_txq(apc, net);
2467 }
2468 
mana_rss_table_alloc(struct mana_port_context * apc)2469 static int mana_rss_table_alloc(struct mana_port_context *apc)
2470 {
2471 	if (!apc->indir_table_sz) {
2472 		netdev_err(apc->ndev,
2473 			   "Indirection table size not set for vPort %d\n",
2474 			   apc->port_idx);
2475 		return -EINVAL;
2476 	}
2477 
2478 	apc->indir_table = kcalloc(apc->indir_table_sz, sizeof(u32), GFP_KERNEL);
2479 	if (!apc->indir_table)
2480 		return -ENOMEM;
2481 
2482 	apc->rxobj_table = kcalloc(apc->indir_table_sz, sizeof(mana_handle_t), GFP_KERNEL);
2483 	if (!apc->rxobj_table) {
2484 		kfree(apc->indir_table);
2485 		return -ENOMEM;
2486 	}
2487 
2488 	return 0;
2489 }
2490 
mana_rss_table_init(struct mana_port_context * apc)2491 static void mana_rss_table_init(struct mana_port_context *apc)
2492 {
2493 	int i;
2494 
2495 	for (i = 0; i < apc->indir_table_sz; i++)
2496 		apc->indir_table[i] =
2497 			ethtool_rxfh_indir_default(i, apc->num_queues);
2498 }
2499 
mana_config_rss(struct mana_port_context * apc,enum TRI_STATE rx,bool update_hash,bool update_tab)2500 int mana_config_rss(struct mana_port_context *apc, enum TRI_STATE rx,
2501 		    bool update_hash, bool update_tab)
2502 {
2503 	u32 queue_idx;
2504 	int err;
2505 	int i;
2506 
2507 	if (update_tab) {
2508 		for (i = 0; i < apc->indir_table_sz; i++) {
2509 			queue_idx = apc->indir_table[i];
2510 			apc->rxobj_table[i] = apc->rxqs[queue_idx]->rxobj;
2511 		}
2512 	}
2513 
2514 	err = mana_cfg_vport_steering(apc, rx, true, update_hash, update_tab);
2515 	if (err)
2516 		return err;
2517 
2518 	mana_fence_rqs(apc);
2519 
2520 	return 0;
2521 }
2522 
mana_query_gf_stats(struct mana_port_context * apc)2523 void mana_query_gf_stats(struct mana_port_context *apc)
2524 {
2525 	struct mana_query_gf_stat_resp resp = {};
2526 	struct mana_query_gf_stat_req req = {};
2527 	struct net_device *ndev = apc->ndev;
2528 	int err;
2529 
2530 	mana_gd_init_req_hdr(&req.hdr, MANA_QUERY_GF_STAT,
2531 			     sizeof(req), sizeof(resp));
2532 	req.hdr.resp.msg_version = GDMA_MESSAGE_V2;
2533 	req.req_stats = STATISTICS_FLAGS_RX_DISCARDS_NO_WQE |
2534 			STATISTICS_FLAGS_RX_ERRORS_VPORT_DISABLED |
2535 			STATISTICS_FLAGS_HC_RX_BYTES |
2536 			STATISTICS_FLAGS_HC_RX_UCAST_PACKETS |
2537 			STATISTICS_FLAGS_HC_RX_UCAST_BYTES |
2538 			STATISTICS_FLAGS_HC_RX_MCAST_PACKETS |
2539 			STATISTICS_FLAGS_HC_RX_MCAST_BYTES |
2540 			STATISTICS_FLAGS_HC_RX_BCAST_PACKETS |
2541 			STATISTICS_FLAGS_HC_RX_BCAST_BYTES |
2542 			STATISTICS_FLAGS_TX_ERRORS_GF_DISABLED |
2543 			STATISTICS_FLAGS_TX_ERRORS_VPORT_DISABLED |
2544 			STATISTICS_FLAGS_TX_ERRORS_INVAL_VPORT_OFFSET_PACKETS |
2545 			STATISTICS_FLAGS_TX_ERRORS_VLAN_ENFORCEMENT |
2546 			STATISTICS_FLAGS_TX_ERRORS_ETH_TYPE_ENFORCEMENT |
2547 			STATISTICS_FLAGS_TX_ERRORS_SA_ENFORCEMENT |
2548 			STATISTICS_FLAGS_TX_ERRORS_SQPDID_ENFORCEMENT |
2549 			STATISTICS_FLAGS_TX_ERRORS_CQPDID_ENFORCEMENT |
2550 			STATISTICS_FLAGS_TX_ERRORS_MTU_VIOLATION |
2551 			STATISTICS_FLAGS_TX_ERRORS_INVALID_OOB |
2552 			STATISTICS_FLAGS_HC_TX_BYTES |
2553 			STATISTICS_FLAGS_HC_TX_UCAST_PACKETS |
2554 			STATISTICS_FLAGS_HC_TX_UCAST_BYTES |
2555 			STATISTICS_FLAGS_HC_TX_MCAST_PACKETS |
2556 			STATISTICS_FLAGS_HC_TX_MCAST_BYTES |
2557 			STATISTICS_FLAGS_HC_TX_BCAST_PACKETS |
2558 			STATISTICS_FLAGS_HC_TX_BCAST_BYTES |
2559 			STATISTICS_FLAGS_TX_ERRORS_GDMA_ERROR;
2560 
2561 	err = mana_send_request(apc->ac, &req, sizeof(req), &resp,
2562 				sizeof(resp));
2563 	if (err) {
2564 		netdev_err(ndev, "Failed to query GF stats: %d\n", err);
2565 		return;
2566 	}
2567 	err = mana_verify_resp_hdr(&resp.hdr, MANA_QUERY_GF_STAT,
2568 				   sizeof(resp));
2569 	if (err || resp.hdr.status) {
2570 		netdev_err(ndev, "Failed to query GF stats: %d, 0x%x\n", err,
2571 			   resp.hdr.status);
2572 		return;
2573 	}
2574 
2575 	apc->eth_stats.hc_rx_discards_no_wqe = resp.rx_discards_nowqe;
2576 	apc->eth_stats.hc_rx_err_vport_disabled = resp.rx_err_vport_disabled;
2577 	apc->eth_stats.hc_rx_bytes = resp.hc_rx_bytes;
2578 	apc->eth_stats.hc_rx_ucast_pkts = resp.hc_rx_ucast_pkts;
2579 	apc->eth_stats.hc_rx_ucast_bytes = resp.hc_rx_ucast_bytes;
2580 	apc->eth_stats.hc_rx_bcast_pkts = resp.hc_rx_bcast_pkts;
2581 	apc->eth_stats.hc_rx_bcast_bytes = resp.hc_rx_bcast_bytes;
2582 	apc->eth_stats.hc_rx_mcast_pkts = resp.hc_rx_mcast_pkts;
2583 	apc->eth_stats.hc_rx_mcast_bytes = resp.hc_rx_mcast_bytes;
2584 	apc->eth_stats.hc_tx_err_gf_disabled = resp.tx_err_gf_disabled;
2585 	apc->eth_stats.hc_tx_err_vport_disabled = resp.tx_err_vport_disabled;
2586 	apc->eth_stats.hc_tx_err_inval_vportoffset_pkt =
2587 					     resp.tx_err_inval_vport_offset_pkt;
2588 	apc->eth_stats.hc_tx_err_vlan_enforcement =
2589 					     resp.tx_err_vlan_enforcement;
2590 	apc->eth_stats.hc_tx_err_eth_type_enforcement =
2591 					     resp.tx_err_ethtype_enforcement;
2592 	apc->eth_stats.hc_tx_err_sa_enforcement = resp.tx_err_SA_enforcement;
2593 	apc->eth_stats.hc_tx_err_sqpdid_enforcement =
2594 					     resp.tx_err_SQPDID_enforcement;
2595 	apc->eth_stats.hc_tx_err_cqpdid_enforcement =
2596 					     resp.tx_err_CQPDID_enforcement;
2597 	apc->eth_stats.hc_tx_err_mtu_violation = resp.tx_err_mtu_violation;
2598 	apc->eth_stats.hc_tx_err_inval_oob = resp.tx_err_inval_oob;
2599 	apc->eth_stats.hc_tx_bytes = resp.hc_tx_bytes;
2600 	apc->eth_stats.hc_tx_ucast_pkts = resp.hc_tx_ucast_pkts;
2601 	apc->eth_stats.hc_tx_ucast_bytes = resp.hc_tx_ucast_bytes;
2602 	apc->eth_stats.hc_tx_bcast_pkts = resp.hc_tx_bcast_pkts;
2603 	apc->eth_stats.hc_tx_bcast_bytes = resp.hc_tx_bcast_bytes;
2604 	apc->eth_stats.hc_tx_mcast_pkts = resp.hc_tx_mcast_pkts;
2605 	apc->eth_stats.hc_tx_mcast_bytes = resp.hc_tx_mcast_bytes;
2606 	apc->eth_stats.hc_tx_err_gdma = resp.tx_err_gdma;
2607 }
2608 
mana_init_port(struct net_device * ndev)2609 static int mana_init_port(struct net_device *ndev)
2610 {
2611 	struct mana_port_context *apc = netdev_priv(ndev);
2612 	struct gdma_dev *gd = apc->ac->gdma_dev;
2613 	u32 max_txq, max_rxq, max_queues;
2614 	int port_idx = apc->port_idx;
2615 	struct gdma_context *gc;
2616 	char vport[32];
2617 	int err;
2618 
2619 	err = mana_init_port_context(apc);
2620 	if (err)
2621 		return err;
2622 
2623 	gc = gd->gdma_context;
2624 
2625 	err = mana_query_vport_cfg(apc, port_idx, &max_txq, &max_rxq,
2626 				   &apc->indir_table_sz);
2627 	if (err) {
2628 		netdev_err(ndev, "Failed to query info for vPort %d\n",
2629 			   port_idx);
2630 		goto reset_apc;
2631 	}
2632 
2633 	max_queues = min_t(u32, max_txq, max_rxq);
2634 	if (apc->max_queues > max_queues)
2635 		apc->max_queues = max_queues;
2636 
2637 	if (apc->num_queues > apc->max_queues)
2638 		apc->num_queues = apc->max_queues;
2639 
2640 	eth_hw_addr_set(ndev, apc->mac_addr);
2641 	sprintf(vport, "vport%d", port_idx);
2642 	apc->mana_port_debugfs = debugfs_create_dir(vport, gc->mana_pci_debugfs);
2643 	return 0;
2644 
2645 reset_apc:
2646 	mana_cleanup_port_context(apc);
2647 	return err;
2648 }
2649 
mana_alloc_queues(struct net_device * ndev)2650 int mana_alloc_queues(struct net_device *ndev)
2651 {
2652 	struct mana_port_context *apc = netdev_priv(ndev);
2653 	struct gdma_dev *gd = apc->ac->gdma_dev;
2654 	int err;
2655 
2656 	err = mana_create_vport(apc, ndev);
2657 	if (err) {
2658 		netdev_err(ndev, "Failed to create vPort %u : %d\n", apc->port_idx, err);
2659 		return err;
2660 	}
2661 
2662 	err = netif_set_real_num_tx_queues(ndev, apc->num_queues);
2663 	if (err) {
2664 		netdev_err(ndev,
2665 			   "netif_set_real_num_tx_queues () failed for ndev with num_queues %u : %d\n",
2666 			   apc->num_queues, err);
2667 		goto destroy_vport;
2668 	}
2669 
2670 	err = mana_add_rx_queues(apc, ndev);
2671 	if (err)
2672 		goto destroy_vport;
2673 
2674 	apc->rss_state = apc->num_queues > 1 ? TRI_STATE_TRUE : TRI_STATE_FALSE;
2675 
2676 	err = netif_set_real_num_rx_queues(ndev, apc->num_queues);
2677 	if (err) {
2678 		netdev_err(ndev,
2679 			   "netif_set_real_num_rx_queues () failed for ndev with num_queues %u : %d\n",
2680 			   apc->num_queues, err);
2681 		goto destroy_vport;
2682 	}
2683 
2684 	mana_rss_table_init(apc);
2685 
2686 	err = mana_config_rss(apc, TRI_STATE_TRUE, true, true);
2687 	if (err) {
2688 		netdev_err(ndev, "Failed to configure RSS table: %d\n", err);
2689 		goto destroy_vport;
2690 	}
2691 
2692 	if (gd->gdma_context->is_pf) {
2693 		err = mana_pf_register_filter(apc);
2694 		if (err)
2695 			goto destroy_vport;
2696 	}
2697 
2698 	mana_chn_setxdp(apc, mana_xdp_get(apc));
2699 
2700 	return 0;
2701 
2702 destroy_vport:
2703 	mana_destroy_vport(apc);
2704 	return err;
2705 }
2706 
mana_attach(struct net_device * ndev)2707 int mana_attach(struct net_device *ndev)
2708 {
2709 	struct mana_port_context *apc = netdev_priv(ndev);
2710 	int err;
2711 
2712 	ASSERT_RTNL();
2713 
2714 	err = mana_init_port(ndev);
2715 	if (err)
2716 		return err;
2717 
2718 	if (apc->port_st_save) {
2719 		err = mana_alloc_queues(ndev);
2720 		if (err) {
2721 			mana_cleanup_port_context(apc);
2722 			return err;
2723 		}
2724 	}
2725 
2726 	apc->port_is_up = apc->port_st_save;
2727 
2728 	/* Ensure port state updated before txq state */
2729 	smp_wmb();
2730 
2731 	if (apc->port_is_up)
2732 		netif_carrier_on(ndev);
2733 
2734 	netif_device_attach(ndev);
2735 
2736 	return 0;
2737 }
2738 
mana_dealloc_queues(struct net_device * ndev)2739 static int mana_dealloc_queues(struct net_device *ndev)
2740 {
2741 	struct mana_port_context *apc = netdev_priv(ndev);
2742 	unsigned long timeout = jiffies + 120 * HZ;
2743 	struct gdma_dev *gd = apc->ac->gdma_dev;
2744 	struct mana_txq *txq;
2745 	struct sk_buff *skb;
2746 	int i, err;
2747 	u32 tsleep;
2748 
2749 	if (apc->port_is_up)
2750 		return -EINVAL;
2751 
2752 	mana_chn_setxdp(apc, NULL);
2753 
2754 	if (gd->gdma_context->is_pf)
2755 		mana_pf_deregister_filter(apc);
2756 
2757 	/* No packet can be transmitted now since apc->port_is_up is false.
2758 	 * There is still a tiny chance that mana_poll_tx_cq() can re-enable
2759 	 * a txq because it may not timely see apc->port_is_up being cleared
2760 	 * to false, but it doesn't matter since mana_start_xmit() drops any
2761 	 * new packets due to apc->port_is_up being false.
2762 	 *
2763 	 * Drain all the in-flight TX packets.
2764 	 * A timeout of 120 seconds for all the queues is used.
2765 	 * This will break the while loop when h/w is not responding.
2766 	 * This value of 120 has been decided here considering max
2767 	 * number of queues.
2768 	 */
2769 
2770 	for (i = 0; i < apc->num_queues; i++) {
2771 		txq = &apc->tx_qp[i].txq;
2772 		tsleep = 1000;
2773 		while (atomic_read(&txq->pending_sends) > 0 &&
2774 		       time_before(jiffies, timeout)) {
2775 			usleep_range(tsleep, tsleep + 1000);
2776 			tsleep <<= 1;
2777 		}
2778 		if (atomic_read(&txq->pending_sends)) {
2779 			err = pcie_flr(to_pci_dev(gd->gdma_context->dev));
2780 			if (err) {
2781 				netdev_err(ndev, "flr failed %d with %d pkts pending in txq %u\n",
2782 					   err, atomic_read(&txq->pending_sends),
2783 					   txq->gdma_txq_id);
2784 			}
2785 			break;
2786 		}
2787 	}
2788 
2789 	for (i = 0; i < apc->num_queues; i++) {
2790 		txq = &apc->tx_qp[i].txq;
2791 		while ((skb = skb_dequeue(&txq->pending_skbs))) {
2792 			mana_unmap_skb(skb, apc);
2793 			dev_kfree_skb_any(skb);
2794 		}
2795 		atomic_set(&txq->pending_sends, 0);
2796 	}
2797 	/* We're 100% sure the queues can no longer be woken up, because
2798 	 * we're sure now mana_poll_tx_cq() can't be running.
2799 	 */
2800 
2801 	apc->rss_state = TRI_STATE_FALSE;
2802 	err = mana_config_rss(apc, TRI_STATE_FALSE, false, false);
2803 	if (err) {
2804 		netdev_err(ndev, "Failed to disable vPort: %d\n", err);
2805 		return err;
2806 	}
2807 
2808 	mana_destroy_vport(apc);
2809 
2810 	return 0;
2811 }
2812 
mana_detach(struct net_device * ndev,bool from_close)2813 int mana_detach(struct net_device *ndev, bool from_close)
2814 {
2815 	struct mana_port_context *apc = netdev_priv(ndev);
2816 	int err;
2817 
2818 	ASSERT_RTNL();
2819 
2820 	apc->port_st_save = apc->port_is_up;
2821 	apc->port_is_up = false;
2822 
2823 	/* Ensure port state updated before txq state */
2824 	smp_wmb();
2825 
2826 	netif_tx_disable(ndev);
2827 	netif_carrier_off(ndev);
2828 
2829 	if (apc->port_st_save) {
2830 		err = mana_dealloc_queues(ndev);
2831 		if (err) {
2832 			netdev_err(ndev, "%s failed to deallocate queues: %d\n", __func__, err);
2833 			return err;
2834 		}
2835 	}
2836 
2837 	if (!from_close) {
2838 		netif_device_detach(ndev);
2839 		mana_cleanup_port_context(apc);
2840 	}
2841 
2842 	return 0;
2843 }
2844 
mana_probe_port(struct mana_context * ac,int port_idx,struct net_device ** ndev_storage)2845 static int mana_probe_port(struct mana_context *ac, int port_idx,
2846 			   struct net_device **ndev_storage)
2847 {
2848 	struct gdma_context *gc = ac->gdma_dev->gdma_context;
2849 	struct mana_port_context *apc;
2850 	struct net_device *ndev;
2851 	int err;
2852 
2853 	ndev = alloc_etherdev_mq(sizeof(struct mana_port_context),
2854 				 gc->max_num_queues);
2855 	if (!ndev)
2856 		return -ENOMEM;
2857 
2858 	*ndev_storage = ndev;
2859 
2860 	apc = netdev_priv(ndev);
2861 	apc->ac = ac;
2862 	apc->ndev = ndev;
2863 	apc->max_queues = gc->max_num_queues;
2864 	apc->num_queues = gc->max_num_queues;
2865 	apc->tx_queue_size = DEF_TX_BUFFERS_PER_QUEUE;
2866 	apc->rx_queue_size = DEF_RX_BUFFERS_PER_QUEUE;
2867 	apc->port_handle = INVALID_MANA_HANDLE;
2868 	apc->pf_filter_handle = INVALID_MANA_HANDLE;
2869 	apc->port_idx = port_idx;
2870 
2871 	mutex_init(&apc->vport_mutex);
2872 	apc->vport_use_count = 0;
2873 
2874 	ndev->netdev_ops = &mana_devops;
2875 	ndev->ethtool_ops = &mana_ethtool_ops;
2876 	ndev->mtu = ETH_DATA_LEN;
2877 	ndev->max_mtu = gc->adapter_mtu - ETH_HLEN;
2878 	ndev->min_mtu = ETH_MIN_MTU;
2879 	ndev->needed_headroom = MANA_HEADROOM;
2880 	ndev->dev_port = port_idx;
2881 	SET_NETDEV_DEV(ndev, gc->dev);
2882 
2883 	netif_set_tso_max_size(ndev, GSO_MAX_SIZE);
2884 
2885 	netif_carrier_off(ndev);
2886 
2887 	netdev_rss_key_fill(apc->hashkey, MANA_HASH_KEY_SIZE);
2888 
2889 	err = mana_init_port(ndev);
2890 	if (err)
2891 		goto free_net;
2892 
2893 	err = mana_rss_table_alloc(apc);
2894 	if (err)
2895 		goto reset_apc;
2896 
2897 	netdev_lockdep_set_classes(ndev);
2898 
2899 	ndev->hw_features = NETIF_F_SG | NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM;
2900 	ndev->hw_features |= NETIF_F_RXCSUM;
2901 	ndev->hw_features |= NETIF_F_TSO | NETIF_F_TSO6;
2902 	ndev->hw_features |= NETIF_F_RXHASH;
2903 	ndev->features = ndev->hw_features | NETIF_F_HW_VLAN_CTAG_TX |
2904 			 NETIF_F_HW_VLAN_CTAG_RX;
2905 	ndev->vlan_features = ndev->features;
2906 	xdp_set_features_flag(ndev, NETDEV_XDP_ACT_BASIC |
2907 			      NETDEV_XDP_ACT_REDIRECT |
2908 			      NETDEV_XDP_ACT_NDO_XMIT);
2909 
2910 	err = register_netdev(ndev);
2911 	if (err) {
2912 		netdev_err(ndev, "Unable to register netdev.\n");
2913 		goto free_indir;
2914 	}
2915 
2916 	return 0;
2917 
2918 free_indir:
2919 	mana_cleanup_indir_table(apc);
2920 reset_apc:
2921 	mana_cleanup_port_context(apc);
2922 free_net:
2923 	*ndev_storage = NULL;
2924 	netdev_err(ndev, "Failed to probe vPort %d: %d\n", port_idx, err);
2925 	free_netdev(ndev);
2926 	return err;
2927 }
2928 
adev_release(struct device * dev)2929 static void adev_release(struct device *dev)
2930 {
2931 	struct mana_adev *madev = container_of(dev, struct mana_adev, adev.dev);
2932 
2933 	kfree(madev);
2934 }
2935 
remove_adev(struct gdma_dev * gd)2936 static void remove_adev(struct gdma_dev *gd)
2937 {
2938 	struct auxiliary_device *adev = gd->adev;
2939 	int id = adev->id;
2940 
2941 	auxiliary_device_delete(adev);
2942 	auxiliary_device_uninit(adev);
2943 
2944 	mana_adev_idx_free(id);
2945 	gd->adev = NULL;
2946 }
2947 
add_adev(struct gdma_dev * gd)2948 static int add_adev(struct gdma_dev *gd)
2949 {
2950 	struct auxiliary_device *adev;
2951 	struct mana_adev *madev;
2952 	int ret;
2953 
2954 	madev = kzalloc(sizeof(*madev), GFP_KERNEL);
2955 	if (!madev)
2956 		return -ENOMEM;
2957 
2958 	adev = &madev->adev;
2959 	ret = mana_adev_idx_alloc();
2960 	if (ret < 0)
2961 		goto idx_fail;
2962 	adev->id = ret;
2963 
2964 	adev->name = "rdma";
2965 	adev->dev.parent = gd->gdma_context->dev;
2966 	adev->dev.release = adev_release;
2967 	madev->mdev = gd;
2968 
2969 	ret = auxiliary_device_init(adev);
2970 	if (ret)
2971 		goto init_fail;
2972 
2973 	/* madev is owned by the auxiliary device */
2974 	madev = NULL;
2975 	ret = auxiliary_device_add(adev);
2976 	if (ret)
2977 		goto add_fail;
2978 
2979 	gd->adev = adev;
2980 	dev_dbg(gd->gdma_context->dev,
2981 		"Auxiliary device added successfully\n");
2982 	return 0;
2983 
2984 add_fail:
2985 	auxiliary_device_uninit(adev);
2986 
2987 init_fail:
2988 	mana_adev_idx_free(adev->id);
2989 
2990 idx_fail:
2991 	kfree(madev);
2992 
2993 	return ret;
2994 }
2995 
mana_probe(struct gdma_dev * gd,bool resuming)2996 int mana_probe(struct gdma_dev *gd, bool resuming)
2997 {
2998 	struct gdma_context *gc = gd->gdma_context;
2999 	struct mana_context *ac = gd->driver_data;
3000 	struct device *dev = gc->dev;
3001 	u16 num_ports = 0;
3002 	int err;
3003 	int i;
3004 
3005 	dev_info(dev,
3006 		 "Microsoft Azure Network Adapter protocol version: %d.%d.%d\n",
3007 		 MANA_MAJOR_VERSION, MANA_MINOR_VERSION, MANA_MICRO_VERSION);
3008 
3009 	err = mana_gd_register_device(gd);
3010 	if (err)
3011 		return err;
3012 
3013 	if (!resuming) {
3014 		ac = kzalloc(sizeof(*ac), GFP_KERNEL);
3015 		if (!ac)
3016 			return -ENOMEM;
3017 
3018 		ac->gdma_dev = gd;
3019 		gd->driver_data = ac;
3020 	}
3021 
3022 	err = mana_create_eq(ac);
3023 	if (err) {
3024 		dev_err(dev, "Failed to create EQs: %d\n", err);
3025 		goto out;
3026 	}
3027 
3028 	err = mana_query_device_cfg(ac, MANA_MAJOR_VERSION, MANA_MINOR_VERSION,
3029 				    MANA_MICRO_VERSION, &num_ports);
3030 	if (err)
3031 		goto out;
3032 
3033 	if (!resuming) {
3034 		ac->num_ports = num_ports;
3035 	} else {
3036 		if (ac->num_ports != num_ports) {
3037 			dev_err(dev, "The number of vPorts changed: %d->%d\n",
3038 				ac->num_ports, num_ports);
3039 			err = -EPROTO;
3040 			goto out;
3041 		}
3042 	}
3043 
3044 	if (ac->num_ports == 0)
3045 		dev_err(dev, "Failed to detect any vPort\n");
3046 
3047 	if (ac->num_ports > MAX_PORTS_IN_MANA_DEV)
3048 		ac->num_ports = MAX_PORTS_IN_MANA_DEV;
3049 
3050 	if (!resuming) {
3051 		for (i = 0; i < ac->num_ports; i++) {
3052 			err = mana_probe_port(ac, i, &ac->ports[i]);
3053 			/* we log the port for which the probe failed and stop
3054 			 * probes for subsequent ports.
3055 			 * Note that we keep running ports, for which the probes
3056 			 * were successful, unless add_adev fails too
3057 			 */
3058 			if (err) {
3059 				dev_err(dev, "Probe Failed for port %d\n", i);
3060 				break;
3061 			}
3062 		}
3063 	} else {
3064 		for (i = 0; i < ac->num_ports; i++) {
3065 			rtnl_lock();
3066 			err = mana_attach(ac->ports[i]);
3067 			rtnl_unlock();
3068 			/* we log the port for which the attach failed and stop
3069 			 * attach for subsequent ports
3070 			 * Note that we keep running ports, for which the attach
3071 			 * were successful, unless add_adev fails too
3072 			 */
3073 			if (err) {
3074 				dev_err(dev, "Attach Failed for port %d\n", i);
3075 				break;
3076 			}
3077 		}
3078 	}
3079 
3080 	err = add_adev(gd);
3081 out:
3082 	if (err) {
3083 		mana_remove(gd, false);
3084 	} else {
3085 		dev_dbg(dev, "gd=%p, id=%u, num_ports=%d, type=%u, instance=%u\n",
3086 			gd, gd->dev_id.as_uint32, ac->num_ports,
3087 			gd->dev_id.type, gd->dev_id.instance);
3088 		dev_dbg(dev, "%s succeeded\n", __func__);
3089 	}
3090 
3091 	return err;
3092 }
3093 
mana_remove(struct gdma_dev * gd,bool suspending)3094 void mana_remove(struct gdma_dev *gd, bool suspending)
3095 {
3096 	struct gdma_context *gc = gd->gdma_context;
3097 	struct mana_context *ac = gd->driver_data;
3098 	struct mana_port_context *apc;
3099 	struct device *dev = gc->dev;
3100 	struct net_device *ndev;
3101 	int err;
3102 	int i;
3103 
3104 	/* adev currently doesn't support suspending, always remove it */
3105 	if (gd->adev)
3106 		remove_adev(gd);
3107 
3108 	for (i = 0; i < ac->num_ports; i++) {
3109 		ndev = ac->ports[i];
3110 		apc = netdev_priv(ndev);
3111 		if (!ndev) {
3112 			if (i == 0)
3113 				dev_err(dev, "No net device to remove\n");
3114 			goto out;
3115 		}
3116 
3117 		/* All cleanup actions should stay after rtnl_lock(), otherwise
3118 		 * other functions may access partially cleaned up data.
3119 		 */
3120 		rtnl_lock();
3121 
3122 		err = mana_detach(ndev, false);
3123 		if (err)
3124 			netdev_err(ndev, "Failed to detach vPort %d: %d\n",
3125 				   i, err);
3126 
3127 		if (suspending) {
3128 			/* No need to unregister the ndev. */
3129 			rtnl_unlock();
3130 			continue;
3131 		}
3132 
3133 		unregister_netdevice(ndev);
3134 		mana_cleanup_indir_table(apc);
3135 
3136 		rtnl_unlock();
3137 
3138 		free_netdev(ndev);
3139 	}
3140 
3141 	mana_destroy_eq(ac);
3142 out:
3143 	mana_gd_deregister_device(gd);
3144 
3145 	if (suspending)
3146 		return;
3147 
3148 	gd->driver_data = NULL;
3149 	gd->gdma_context = NULL;
3150 	kfree(ac);
3151 	dev_dbg(dev, "%s succeeded\n", __func__);
3152 }
3153 
mana_get_primary_netdev(struct mana_context * ac,u32 port_index,netdevice_tracker * tracker)3154 struct net_device *mana_get_primary_netdev(struct mana_context *ac,
3155 					   u32 port_index,
3156 					   netdevice_tracker *tracker)
3157 {
3158 	struct net_device *ndev;
3159 
3160 	if (port_index >= ac->num_ports)
3161 		return NULL;
3162 
3163 	rcu_read_lock();
3164 
3165 	/* If mana is used in netvsc, the upper netdevice should be returned. */
3166 	ndev = netdev_master_upper_dev_get_rcu(ac->ports[port_index]);
3167 
3168 	/* If there is no upper device, use the parent Ethernet device */
3169 	if (!ndev)
3170 		ndev = ac->ports[port_index];
3171 
3172 	netdev_hold(ndev, tracker, GFP_ATOMIC);
3173 	rcu_read_unlock();
3174 
3175 	return ndev;
3176 }
3177 EXPORT_SYMBOL_NS(mana_get_primary_netdev, "NET_MANA");
3178