1	// SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
2	/*
3	* Copyright(c) 2015-2020 Intel Corporation.
4	* Copyright(c) 2021 Cornelis Networks.
5	*/
6
7	#include <linux/spinlock.h>
8	#include <linux/pci.h>
9	#include <linux/io.h>
10	#include <linux/delay.h>
11	#include <linux/netdevice.h>
12	#include <linux/vmalloc.h>
13	#include <linux/module.h>
14	#include <linux/prefetch.h>
15	#include <rdma/ib_verbs.h>
16	#include <linux/etherdevice.h>
17
18	#include "hfi.h"
19	#include "trace.h"
20	#include "qp.h"
21	#include "sdma.h"
22	#include "debugfs.h"
23	#include "vnic.h"
24	#include "fault.h"
25
26	#include "ipoib.h"
27	#include "netdev.h"
28
29	#undef pr_fmt
30	#define pr_fmt(fmt) DRIVER_NAME ": " fmt
31
32	DEFINE_MUTEX(hfi1_mutex); /* general driver use */
33
34	unsigned int hfi1_max_mtu = HFI1_DEFAULT_MAX_MTU;
35	module_param_named(max_mtu, hfi1_max_mtu, uint, S_IRUGO);
36	MODULE_PARM_DESC(max_mtu, "Set max MTU bytes, default is " __stringify(
37	HFI1_DEFAULT_MAX_MTU));
38
39	unsigned int hfi1_cu = 1;
40	module_param_named(cu, hfi1_cu, uint, S_IRUGO);
41	MODULE_PARM_DESC(cu, "Credit return units");
42
43	unsigned long hfi1_cap_mask = HFI1_CAP_MASK_DEFAULT;
44	static int hfi1_caps_set(const char *val, const struct kernel_param *kp);
45	static int hfi1_caps_get(char *buffer, const struct kernel_param *kp);
46	static const struct kernel_param_ops cap_ops = {
47	.set = hfi1_caps_set,
48	.get = hfi1_caps_get
49	};
50	module_param_cb(cap_mask, &cap_ops, &hfi1_cap_mask, S_IWUSR | S_IRUGO);
51	MODULE_PARM_DESC(cap_mask, "Bit mask of enabled/disabled HW features");
52
53	MODULE_LICENSE("Dual BSD/GPL");
54	MODULE_DESCRIPTION("Cornelis Omni-Path Express driver");
55
56	/*
57	* MAX_PKT_RCV is the max # if packets processed per receive interrupt.
58	*/
59	#define MAX_PKT_RECV 64
60	/*
61	* MAX_PKT_THREAD_RCV is the max # of packets processed before
62	* the qp_wait_list queue is flushed.
63	*/
64	#define MAX_PKT_RECV_THREAD (MAX_PKT_RECV * 4)
65	#define EGR_HEAD_UPDATE_THRESHOLD 16
66
67	struct hfi1_ib_stats hfi1_stats;
68
69	static int hfi1_caps_set(const char *val, const struct kernel_param *kp)
70	{
71	int ret = 0;
72	unsigned long *cap_mask_ptr = (unsigned long *)kp->arg,
73	cap_mask = *cap_mask_ptr, value, diff,
74	write_mask = ((HFI1_CAP_WRITABLE_MASK << HFI1_CAP_USER_SHIFT) |
75	HFI1_CAP_WRITABLE_MASK);
76
77	ret = kstrtoul(s: val, base: 0, res: &value);
78	if (ret) {
79	pr_warn("Invalid module parameter value for 'cap_mask'\n");
80	goto done;
81	}
82	/* Get the changed bits (except the locked bit) */
83	diff = value ^ (cap_mask & ~HFI1_CAP_LOCKED_SMASK);
84
85	/* Remove any bits that are not allowed to change after driver load */
86	if (HFI1_CAP_LOCKED() && (diff & ~write_mask)) {
87	pr_warn("Ignoring non-writable capability bits %#lx\n",
88	diff & ~write_mask);
89	diff &= write_mask;
90	}
91
92	/* Mask off any reserved bits */
93	diff &= ~HFI1_CAP_RESERVED_MASK;
94	/* Clear any previously set and changing bits */
95	cap_mask &= ~diff;
96	/* Update the bits with the new capability */
97	cap_mask |= (value & diff);
98	/* Check for any kernel/user restrictions */
99	diff = (cap_mask & (HFI1_CAP_MUST_HAVE_KERN << HFI1_CAP_USER_SHIFT)) ^
100	((cap_mask & HFI1_CAP_MUST_HAVE_KERN) << HFI1_CAP_USER_SHIFT);
101	cap_mask &= ~diff;
102	/* Set the bitmask to the final set */
103	*cap_mask_ptr = cap_mask;
104	done:
105	return ret;
106	}
107
108	static int hfi1_caps_get(char *buffer, const struct kernel_param *kp)
109	{
110	unsigned long cap_mask = *(unsigned long *)kp->arg;
111
112	cap_mask &= ~HFI1_CAP_LOCKED_SMASK;
113	cap_mask |= ((cap_mask & HFI1_CAP_K2U) << HFI1_CAP_USER_SHIFT);
114
115	return sysfs_emit(buf: buffer, fmt: "0x%lx\n", cap_mask);
116	}
117
118	struct pci_dev *get_pci_dev(struct rvt_dev_info *rdi)
119	{
120	struct hfi1_ibdev *ibdev = container_of(rdi, struct hfi1_ibdev, rdi);
121	struct hfi1_devdata *dd = container_of(ibdev,
122	struct hfi1_devdata, verbs_dev);
123	return dd->pcidev;
124	}
125
126	/*
127	* Return count of units with at least one port ACTIVE.
128	*/
129	int hfi1_count_active_units(void)
130	{
131	struct hfi1_devdata *dd;
132	struct hfi1_pportdata *ppd;
133	unsigned long index, flags;
134	int pidx, nunits_active = 0;
135
136	xa_lock_irqsave(&hfi1_dev_table, flags);
137	xa_for_each(&hfi1_dev_table, index, dd) {
138	if (!(dd->flags & HFI1_PRESENT) || !dd->kregbase1)
139	continue;
140	for (pidx = 0; pidx < dd->num_pports; ++pidx) {
141	ppd = dd->pport + pidx;
142	if (ppd->lid && ppd->linkup) {
143	nunits_active++;
144	break;
145	}
146	}
147	}
148	xa_unlock_irqrestore(&hfi1_dev_table, flags);
149	return nunits_active;
150	}
151
152	/*
153	* Get address of eager buffer from it's index (allocated in chunks, not
154	* contiguous).
155	*/
156	static inline void *get_egrbuf(const struct hfi1_ctxtdata *rcd, u64 rhf,
157	u8 *update)
158	{
159	u32 idx = rhf_egr_index(rhf), offset = rhf_egr_buf_offset(rhf);
160
161	*update |= !(idx & (rcd->egrbufs.threshold - 1)) && !offset;
162	return (void *)(((u64)(rcd->egrbufs.rcvtids[idx].addr)) +
163	(offset * RCV_BUF_BLOCK_SIZE));
164	}
165
166	static inline void *hfi1_get_header(struct hfi1_ctxtdata *rcd,
167	__le32 *rhf_addr)
168	{
169	u32 offset = rhf_hdrq_offset(rhf: rhf_to_cpu(rbuf: rhf_addr));
170
171	return (void *)(rhf_addr - rcd->rhf_offset + offset);
172	}
173
174	static inline struct ib_header *hfi1_get_msgheader(struct hfi1_ctxtdata *rcd,
175	__le32 *rhf_addr)
176	{
177	return (struct ib_header *)hfi1_get_header(rcd, rhf_addr);
178	}
179
180	static inline struct hfi1_16b_header
181	*hfi1_get_16B_header(struct hfi1_ctxtdata *rcd,
182	__le32 *rhf_addr)
183	{
184	return (struct hfi1_16b_header *)hfi1_get_header(rcd, rhf_addr);
185	}
186
187	/*
188	* Validate and encode the a given RcvArray Buffer size.
189	* The function will check whether the given size falls within
190	* allowed size ranges for the respective type and, optionally,
191	* return the proper encoding.
192	*/
193	int hfi1_rcvbuf_validate(u32 size, u8 type, u16 *encoded)
194	{
195	if (unlikely(!PAGE_ALIGNED(size)))
196	return 0;
197	if (unlikely(size < MIN_EAGER_BUFFER))
198	return 0;
199	if (size >
200	(type == PT_EAGER ? MAX_EAGER_BUFFER : MAX_EXPECTED_BUFFER))
201	return 0;
202	if (encoded)
203	*encoded = ilog2(size / PAGE_SIZE) + 1;
204	return 1;
205	}
206
207	static void rcv_hdrerr(struct hfi1_ctxtdata *rcd, struct hfi1_pportdata *ppd,
208	struct hfi1_packet *packet)
209	{
210	struct ib_header *rhdr = packet->hdr;
211	u32 rte = rhf_rcv_type_err(rhf: packet->rhf);
212	u32 mlid_base;
213	struct hfi1_ibport *ibp = rcd_to_iport(rcd);
214	struct hfi1_devdata *dd = ppd->dd;
215	struct hfi1_ibdev *verbs_dev = &dd->verbs_dev;
216	struct rvt_dev_info *rdi = &verbs_dev->rdi;
217
218	if ((packet->rhf & RHF_DC_ERR) &&
219	hfi1_dbg_fault_suppress_err(ibd: verbs_dev))
220	return;
221
222	if (packet->rhf & RHF_ICRC_ERR)
223	return;
224
225	if (packet->etype == RHF_RCV_TYPE_BYPASS) {
226	goto drop;
227	} else {
228	u8 lnh = ib_get_lnh(hdr: rhdr);
229
230	mlid_base = be16_to_cpu(IB_MULTICAST_LID_BASE);
231	if (lnh == HFI1_LRH_BTH) {
232	packet->ohdr = &rhdr->u.oth;
233	} else if (lnh == HFI1_LRH_GRH) {
234	packet->ohdr = &rhdr->u.l.oth;
235	packet->grh = &rhdr->u.l.grh;
236	} else {
237	goto drop;
238	}
239	}
240
241	if (packet->rhf & RHF_TID_ERR) {
242	/* For TIDERR and RC QPs preemptively schedule a NAK */
243	u32 tlen = rhf_pkt_len(rhf: packet->rhf); /* in bytes */
244	u32 dlid = ib_get_dlid(hdr: rhdr);
245	u32 qp_num;
246
247	/* Sanity check packet */
248	if (tlen < 24)
249	goto drop;
250
251	/* Check for GRH */
252	if (packet->grh) {
253	u32 vtf;
254	struct ib_grh *grh = packet->grh;
255
256	if (grh->next_hdr != IB_GRH_NEXT_HDR)
257	goto drop;
258	vtf = be32_to_cpu(grh->version_tclass_flow);
259	if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
260	goto drop;
261	}
262
263	/* Get the destination QP number. */
264	qp_num = ib_bth_get_qpn(ohdr: packet->ohdr);
265	if (dlid < mlid_base) {
266	struct rvt_qp *qp;
267	unsigned long flags;
268
269	rcu_read_lock();
270	qp = rvt_lookup_qpn(rdi, rvp: &ibp->rvp, qpn: qp_num);
271	if (!qp) {
272	rcu_read_unlock();
273	goto drop;
274	}
275
276	/*
277	* Handle only RC QPs - for other QP types drop error
278	* packet.
279	*/
280	spin_lock_irqsave(&qp->r_lock, flags);
281
282	/* Check for valid receive state. */
283	if (!(ib_rvt_state_ops[qp->state] &
284	RVT_PROCESS_RECV_OK)) {
285	ibp->rvp.n_pkt_drops++;
286	}
287
288	switch (qp->ibqp.qp_type) {
289	case IB_QPT_RC:
290	hfi1_rc_hdrerr(rcd, packet, qp);
291	break;
292	default:
293	/* For now don't handle any other QP types */
294	break;
295	}
296
297	spin_unlock_irqrestore(lock: &qp->r_lock, flags);
298	rcu_read_unlock();
299	} /* Unicast QP */
300	} /* Valid packet with TIDErr */
301
302	/* handle "RcvTypeErr" flags */
303	switch (rte) {
304	case RHF_RTE_ERROR_OP_CODE_ERR:
305	{
306	void *ebuf = NULL;
307	u8 opcode;
308
309	if (rhf_use_egr_bfr(rhf: packet->rhf))
310	ebuf = packet->ebuf;
311
312	if (!ebuf)
313	goto drop; /* this should never happen */
314
315	opcode = ib_bth_get_opcode(ohdr: packet->ohdr);
316	if (opcode == IB_OPCODE_CNP) {
317	/*
318	* Only in pre-B0 h/w is the CNP_OPCODE handled
319	* via this code path.
320	*/
321	struct rvt_qp *qp = NULL;
322	u32 lqpn, rqpn;
323	u16 rlid;
324	u8 svc_type, sl, sc5;
325
326	sc5 = hfi1_9B_get_sc5(hdr: rhdr, rhf: packet->rhf);
327	sl = ibp->sc_to_sl[sc5];
328
329	lqpn = ib_bth_get_qpn(ohdr: packet->ohdr);
330	rcu_read_lock();
331	qp = rvt_lookup_qpn(rdi, rvp: &ibp->rvp, qpn: lqpn);
332	if (!qp) {
333	rcu_read_unlock();
334	goto drop;
335	}
336
337	switch (qp->ibqp.qp_type) {
338	case IB_QPT_UD:
339	rlid = 0;
340	rqpn = 0;
341	svc_type = IB_CC_SVCTYPE_UD;
342	break;
343	case IB_QPT_UC:
344	rlid = ib_get_slid(hdr: rhdr);
345	rqpn = qp->remote_qpn;
346	svc_type = IB_CC_SVCTYPE_UC;
347	break;
348	default:
349	rcu_read_unlock();
350	goto drop;
351	}
352
353	process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
354	rcu_read_unlock();
355	}
356
357	packet->rhf &= ~RHF_RCV_TYPE_ERR_SMASK;
358	break;
359	}
360	default:
361	break;
362	}
363
364	drop:
365	return;
366	}
367
368	static inline void init_packet(struct hfi1_ctxtdata *rcd,
369	struct hfi1_packet *packet)
370	{
371	packet->rsize = get_hdrqentsize(rcd); /* words */
372	packet->maxcnt = get_hdrq_cnt(rcd) * packet->rsize; /* words */
373	packet->rcd = rcd;
374	packet->updegr = 0;
375	packet->etail = -1;
376	packet->rhf_addr = get_rhf_addr(rcd);
377	packet->rhf = rhf_to_cpu(rbuf: packet->rhf_addr);
378	packet->rhqoff = hfi1_rcd_head(rcd);
379	packet->numpkt = 0;
380	}
381
382	/* We support only two types - 9B and 16B for now */
383	static const hfi1_handle_cnp hfi1_handle_cnp_tbl[2] = {
384	[HFI1_PKT_TYPE_9B] = &return_cnp,
385	[HFI1_PKT_TYPE_16B] = &return_cnp_16B
386	};
387
388	/**
389	* hfi1_process_ecn_slowpath - Process FECN or BECN bits
390	* @qp: The packet's destination QP
391	* @pkt: The packet itself.
392	* @prescan: Is the caller the RXQ prescan
393	*
394	* Process the packet's FECN or BECN bits. By now, the packet
395	* has already been evaluated whether processing of those bit should
396	* be done.
397	* The significance of the @prescan argument is that if the caller
398	* is the RXQ prescan, a CNP will be send out instead of waiting for the
399	* normal packet processing to send an ACK with BECN set (or a CNP).
400	*/
401	bool hfi1_process_ecn_slowpath(struct rvt_qp *qp, struct hfi1_packet *pkt,
402	bool prescan)
403	{
404	struct hfi1_ibport *ibp = to_iport(ibdev: qp->ibqp.device, port: qp->port_num);
405	struct hfi1_pportdata *ppd = ppd_from_ibp(ibp);
406	struct ib_other_headers *ohdr = pkt->ohdr;
407	struct ib_grh *grh = pkt->grh;
408	u32 rqpn = 0;
409	u16 pkey;
410	u32 rlid, slid, dlid = 0;
411	u8 hdr_type, sc, svc_type, opcode;
412	bool is_mcast = false, ignore_fecn = false, do_cnp = false,
413	fecn, becn;
414
415	/* can be called from prescan */
416	if (pkt->etype == RHF_RCV_TYPE_BYPASS) {
417	pkey = hfi1_16B_get_pkey(hdr: pkt->hdr);
418	sc = hfi1_16B_get_sc(hdr: pkt->hdr);
419	dlid = hfi1_16B_get_dlid(hdr: pkt->hdr);
420	slid = hfi1_16B_get_slid(hdr: pkt->hdr);
421	is_mcast = hfi1_is_16B_mcast(lid: dlid);
422	opcode = ib_bth_get_opcode(ohdr);
423	hdr_type = HFI1_PKT_TYPE_16B;
424	fecn = hfi1_16B_get_fecn(hdr: pkt->hdr);
425	becn = hfi1_16B_get_becn(hdr: pkt->hdr);
426	} else {
427	pkey = ib_bth_get_pkey(ohdr);
428	sc = hfi1_9B_get_sc5(hdr: pkt->hdr, rhf: pkt->rhf);
429	dlid = qp->ibqp.qp_type != IB_QPT_UD ? ib_get_dlid(hdr: pkt->hdr) :
430	ppd->lid;
431	slid = ib_get_slid(hdr: pkt->hdr);
432	is_mcast = (dlid > be16_to_cpu(IB_MULTICAST_LID_BASE)) &&
433	(dlid != be16_to_cpu(IB_LID_PERMISSIVE));
434	opcode = ib_bth_get_opcode(ohdr);
435	hdr_type = HFI1_PKT_TYPE_9B;
436	fecn = ib_bth_get_fecn(ohdr);
437	becn = ib_bth_get_becn(ohdr);
438	}
439
440	switch (qp->ibqp.qp_type) {
441	case IB_QPT_UD:
442	rlid = slid;
443	rqpn = ib_get_sqpn(ohdr: pkt->ohdr);
444	svc_type = IB_CC_SVCTYPE_UD;
445	break;
446	case IB_QPT_SMI:
447	case IB_QPT_GSI:
448	rlid = slid;
449	rqpn = ib_get_sqpn(ohdr: pkt->ohdr);
450	svc_type = IB_CC_SVCTYPE_UD;
451	break;
452	case IB_QPT_UC:
453	rlid = rdma_ah_get_dlid(attr: &qp->remote_ah_attr);
454	rqpn = qp->remote_qpn;
455	svc_type = IB_CC_SVCTYPE_UC;
456	break;
457	case IB_QPT_RC:
458	rlid = rdma_ah_get_dlid(attr: &qp->remote_ah_attr);
459	rqpn = qp->remote_qpn;
460	svc_type = IB_CC_SVCTYPE_RC;
461	break;
462	default:
463	return false;
464	}
465
466	ignore_fecn = is_mcast || (opcode == IB_OPCODE_CNP) ||
467	(opcode == IB_OPCODE_RC_ACKNOWLEDGE);
468	/*
469	* ACKNOWLEDGE packets do not get a CNP but this will be
470	* guarded by ignore_fecn above.
471	*/
472	do_cnp = prescan ||
473	(opcode >= IB_OPCODE_RC_RDMA_READ_RESPONSE_FIRST &&
474	opcode <= IB_OPCODE_RC_ATOMIC_ACKNOWLEDGE) ||
475	opcode == TID_OP(READ_RESP) ||
476	opcode == TID_OP(ACK);
477
478	/* Call appropriate CNP handler */
479	if (!ignore_fecn && do_cnp && fecn)
480	hfi1_handle_cnp_tbl[hdr_type](ibp, qp, rqpn, pkey,
481	dlid, rlid, sc, grh);
482
483	if (becn) {
484	u32 lqpn = be32_to_cpu(ohdr->bth[1]) & RVT_QPN_MASK;
485	u8 sl = ibp->sc_to_sl[sc];
486
487	process_becn(ppd, sl, rlid, lqpn, rqpn, svc_type);
488	}
489	return !ignore_fecn && fecn;
490	}
491
492	struct ps_mdata {
493	struct hfi1_ctxtdata *rcd;
494	u32 rsize;
495	u32 maxcnt;
496	u32 ps_head;
497	u32 ps_tail;
498	u32 ps_seq;
499	};
500
501	static inline void init_ps_mdata(struct ps_mdata *mdata,
502	struct hfi1_packet *packet)
503	{
504	struct hfi1_ctxtdata *rcd = packet->rcd;
505
506	mdata->rcd = rcd;
507	mdata->rsize = packet->rsize;
508	mdata->maxcnt = packet->maxcnt;
509	mdata->ps_head = packet->rhqoff;
510
511	if (get_dma_rtail_setting(rcd)) {
512	mdata->ps_tail = get_rcvhdrtail(rcd);
513	if (rcd->ctxt == HFI1_CTRL_CTXT)
514	mdata->ps_seq = hfi1_seq_cnt(rcd);
515	else
516	mdata->ps_seq = 0; /* not used with DMA_RTAIL */
517	} else {
518	mdata->ps_tail = 0; /* used only with DMA_RTAIL*/
519	mdata->ps_seq = hfi1_seq_cnt(rcd);
520	}
521	}
522
523	static inline int ps_done(struct ps_mdata *mdata, u64 rhf,
524	struct hfi1_ctxtdata *rcd)
525	{
526	if (get_dma_rtail_setting(rcd))
527	return mdata->ps_head == mdata->ps_tail;
528	return mdata->ps_seq != rhf_rcv_seq(rhf);
529	}
530
531	static inline int ps_skip(struct ps_mdata *mdata, u64 rhf,
532	struct hfi1_ctxtdata *rcd)
533	{
534	/*
535	* Control context can potentially receive an invalid rhf.
536	* Drop such packets.
537	*/
538	if ((rcd->ctxt == HFI1_CTRL_CTXT) && (mdata->ps_head != mdata->ps_tail))
539	return mdata->ps_seq != rhf_rcv_seq(rhf);
540
541	return 0;
542	}
543
544	static inline void update_ps_mdata(struct ps_mdata *mdata,
545	struct hfi1_ctxtdata *rcd)
546	{
547	mdata->ps_head += mdata->rsize;
548	if (mdata->ps_head >= mdata->maxcnt)
549	mdata->ps_head = 0;
550
551	/* Control context must do seq counting */
552	if (!get_dma_rtail_setting(rcd) ||
553	rcd->ctxt == HFI1_CTRL_CTXT)
554	mdata->ps_seq = hfi1_seq_incr_wrap(seq: mdata->ps_seq);
555	}
556
557	/*
558	* prescan_rxq - search through the receive queue looking for packets
559	* containing Excplicit Congestion Notifications (FECNs, or BECNs).
560	* When an ECN is found, process the Congestion Notification, and toggle
561	* it off.
562	* This is declared as a macro to allow quick checking of the port to avoid
563	* the overhead of a function call if not enabled.
564	*/
565	#define prescan_rxq(rcd, packet) \
566	do { \
567	if (rcd->ppd->cc_prescan) \
568	__prescan_rxq(packet); \
569	} while (0)
570	static void __prescan_rxq(struct hfi1_packet *packet)
571	{
572	struct hfi1_ctxtdata *rcd = packet->rcd;
573	struct ps_mdata mdata;
574
575	init_ps_mdata(mdata: &mdata, packet);
576
577	while (1) {
578	struct hfi1_ibport *ibp = rcd_to_iport(rcd);
579	__le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +
580	packet->rcd->rhf_offset;
581	struct rvt_qp *qp;
582	struct ib_header *hdr;
583	struct rvt_dev_info *rdi = &rcd->dd->verbs_dev.rdi;
584	u64 rhf = rhf_to_cpu(rbuf: rhf_addr);
585	u32 etype = rhf_rcv_type(rhf), qpn, bth1;
586	u8 lnh;
587
588	if (ps_done(mdata: &mdata, rhf, rcd))
589	break;
590
591	if (ps_skip(mdata: &mdata, rhf, rcd))
592	goto next;
593
594	if (etype != RHF_RCV_TYPE_IB)
595	goto next;
596
597	packet->hdr = hfi1_get_msgheader(rcd: packet->rcd, rhf_addr);
598	hdr = packet->hdr;
599	lnh = ib_get_lnh(hdr);
600
601	if (lnh == HFI1_LRH_BTH) {
602	packet->ohdr = &hdr->u.oth;
603	packet->grh = NULL;
604	} else if (lnh == HFI1_LRH_GRH) {
605	packet->ohdr = &hdr->u.l.oth;
606	packet->grh = &hdr->u.l.grh;
607	} else {
608	goto next; /* just in case */
609	}
610
611	if (!hfi1_may_ecn(pkt: packet))
612	goto next;
613
614	bth1 = be32_to_cpu(packet->ohdr->bth[1]);
615	qpn = bth1 & RVT_QPN_MASK;
616	rcu_read_lock();
617	qp = rvt_lookup_qpn(rdi, rvp: &ibp->rvp, qpn);
618
619	if (!qp) {
620	rcu_read_unlock();
621	goto next;
622	}
623
624	hfi1_process_ecn_slowpath(qp, pkt: packet, prescan: true);
625	rcu_read_unlock();
626
627	/* turn off BECN, FECN */
628	bth1 &= ~(IB_FECN_SMASK | IB_BECN_SMASK);
629	packet->ohdr->bth[1] = cpu_to_be32(bth1);
630	next:
631	update_ps_mdata(mdata: &mdata, rcd);
632	}
633	}
634
635	static void process_rcv_qp_work(struct hfi1_packet *packet)
636	{
637	struct rvt_qp *qp, *nqp;
638	struct hfi1_ctxtdata *rcd = packet->rcd;
639
640	/*
641	* Iterate over all QPs waiting to respond.
642	* The list won't change since the IRQ is only run on one CPU.
643	*/
644	list_for_each_entry_safe(qp, nqp, &rcd->qp_wait_list, rspwait) {
645	list_del_init(entry: &qp->rspwait);
646	if (qp->r_flags & RVT_R_RSP_NAK) {
647	qp->r_flags &= ~RVT_R_RSP_NAK;
648	packet->qp = qp;
649	hfi1_send_rc_ack(packet, is_fecn: 0);
650	}
651	if (qp->r_flags & RVT_R_RSP_SEND) {
652	unsigned long flags;
653
654	qp->r_flags &= ~RVT_R_RSP_SEND;
655	spin_lock_irqsave(&qp->s_lock, flags);
656	if (ib_rvt_state_ops[qp->state] &
657	RVT_PROCESS_OR_FLUSH_SEND)
658	hfi1_schedule_send(qp);
659	spin_unlock_irqrestore(lock: &qp->s_lock, flags);
660	}
661	rvt_put_qp(qp);
662	}
663	}
664
665	static noinline int max_packet_exceeded(struct hfi1_packet *packet, int thread)
666	{
667	if (thread) {
668	if ((packet->numpkt & (MAX_PKT_RECV_THREAD - 1)) == 0)
669	/* allow defered processing */
670	process_rcv_qp_work(packet);
671	cond_resched();
672	return RCV_PKT_OK;
673	} else {
674	this_cpu_inc(*packet->rcd->dd->rcv_limit);
675	return RCV_PKT_LIMIT;
676	}
677	}
678
679	static inline int check_max_packet(struct hfi1_packet *packet, int thread)
680	{
681	int ret = RCV_PKT_OK;
682
683	if (unlikely((packet->numpkt & (MAX_PKT_RECV - 1)) == 0))
684	ret = max_packet_exceeded(packet, thread);
685	return ret;
686	}
687
688	static noinline int skip_rcv_packet(struct hfi1_packet *packet, int thread)
689	{
690	int ret;
691
692	packet->rcd->dd->ctx0_seq_drop++;
693	/* Set up for the next packet */
694	packet->rhqoff += packet->rsize;
695	if (packet->rhqoff >= packet->maxcnt)
696	packet->rhqoff = 0;
697
698	packet->numpkt++;
699	ret = check_max_packet(packet, thread);
700
701	packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
702	packet->rcd->rhf_offset;
703	packet->rhf = rhf_to_cpu(rbuf: packet->rhf_addr);
704
705	return ret;
706	}
707
708	static void process_rcv_packet_napi(struct hfi1_packet *packet)
709	{
710	packet->etype = rhf_rcv_type(rhf: packet->rhf);
711
712	/* total length */
713	packet->tlen = rhf_pkt_len(rhf: packet->rhf); /* in bytes */
714	/* retrieve eager buffer details */
715	packet->etail = rhf_egr_index(rhf: packet->rhf);
716	packet->ebuf = get_egrbuf(rcd: packet->rcd, rhf: packet->rhf,
717	update: &packet->updegr);
718	/*
719	* Prefetch the contents of the eager buffer. It is
720	* OK to send a negative length to prefetch_range().
721	* The +2 is the size of the RHF.
722	*/
723	prefetch_range(addr: packet->ebuf,
724	len: packet->tlen - ((packet->rcd->rcvhdrqentsize -
725	(rhf_hdrq_offset(rhf: packet->rhf)
726	+ 2)) * 4));
727
728	packet->rcd->rhf_rcv_function_map[packet->etype](packet);
729	packet->numpkt++;
730
731	/* Set up for the next packet */
732	packet->rhqoff += packet->rsize;
733	if (packet->rhqoff >= packet->maxcnt)
734	packet->rhqoff = 0;
735
736	packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
737	packet->rcd->rhf_offset;
738	packet->rhf = rhf_to_cpu(rbuf: packet->rhf_addr);
739	}
740
741	static inline int process_rcv_packet(struct hfi1_packet *packet, int thread)
742	{
743	int ret;
744
745	packet->etype = rhf_rcv_type(rhf: packet->rhf);
746
747	/* total length */
748	packet->tlen = rhf_pkt_len(rhf: packet->rhf); /* in bytes */
749	/* retrieve eager buffer details */
750	packet->ebuf = NULL;
751	if (rhf_use_egr_bfr(rhf: packet->rhf)) {
752	packet->etail = rhf_egr_index(rhf: packet->rhf);
753	packet->ebuf = get_egrbuf(rcd: packet->rcd, rhf: packet->rhf,
754	update: &packet->updegr);
755	/*
756	* Prefetch the contents of the eager buffer. It is
757	* OK to send a negative length to prefetch_range().
758	* The +2 is the size of the RHF.
759	*/
760	prefetch_range(addr: packet->ebuf,
761	len: packet->tlen - ((get_hdrqentsize(rcd: packet->rcd) -
762	(rhf_hdrq_offset(rhf: packet->rhf)
763	+ 2)) * 4));
764	}
765
766	/*
767	* Call a type specific handler for the packet. We
768	* should be able to trust that etype won't be beyond
769	* the range of valid indexes. If so something is really
770	* wrong and we can probably just let things come
771	* crashing down. There is no need to eat another
772	* comparison in this performance critical code.
773	*/
774	packet->rcd->rhf_rcv_function_map[packet->etype](packet);
775	packet->numpkt++;
776
777	/* Set up for the next packet */
778	packet->rhqoff += packet->rsize;
779	if (packet->rhqoff >= packet->maxcnt)
780	packet->rhqoff = 0;
781
782	ret = check_max_packet(packet, thread);
783
784	packet->rhf_addr = (__le32 *)packet->rcd->rcvhdrq + packet->rhqoff +
785	packet->rcd->rhf_offset;
786	packet->rhf = rhf_to_cpu(rbuf: packet->rhf_addr);
787
788	return ret;
789	}
790
791	static inline void process_rcv_update(int last, struct hfi1_packet *packet)
792	{
793	/*
794	* Update head regs etc., every 16 packets, if not last pkt,
795	* to help prevent rcvhdrq overflows, when many packets
796	* are processed and queue is nearly full.
797	* Don't request an interrupt for intermediate updates.
798	*/
799	if (!last && !(packet->numpkt & 0xf)) {
800	update_usrhead(rcd: packet->rcd, hd: packet->rhqoff, updegr: packet->updegr,
801	egrhd: packet->etail, intr_adjust: 0, npkts: 0);
802	packet->updegr = 0;
803	}
804	packet->grh = NULL;
805	}
806
807	static inline void finish_packet(struct hfi1_packet *packet)
808	{
809	/*
810	* Nothing we need to free for the packet.
811	*
812	* The only thing we need to do is a final update and call for an
813	* interrupt
814	*/
815	update_usrhead(rcd: packet->rcd, hd: hfi1_rcd_head(rcd: packet->rcd), updegr: packet->updegr,
816	egrhd: packet->etail, intr_adjust: rcv_intr_dynamic, npkts: packet->numpkt);
817	}
818
819	/*
820	* handle_receive_interrupt_napi_fp - receive a packet
821	* @rcd: the context
822	* @budget: polling budget
823	*
824	* Called from interrupt handler for receive interrupt.
825	* This is the fast path interrupt handler
826	* when executing napi soft irq environment.
827	*/
828	int handle_receive_interrupt_napi_fp(struct hfi1_ctxtdata *rcd, int budget)
829	{
830	struct hfi1_packet packet;
831
832	init_packet(rcd, packet: &packet);
833	if (last_rcv_seq(rcd, seq: rhf_rcv_seq(rhf: packet.rhf)))
834	goto bail;
835
836	while (packet.numpkt < budget) {
837	process_rcv_packet_napi(packet: &packet);
838	if (hfi1_seq_incr(rcd, seq: rhf_rcv_seq(rhf: packet.rhf)))
839	break;
840
841	process_rcv_update(last: 0, packet: &packet);
842	}
843	hfi1_set_rcd_head(rcd, head: packet.rhqoff);
844	bail:
845	finish_packet(packet: &packet);
846	return packet.numpkt;
847	}
848
849	/*
850	* Handle receive interrupts when using the no dma rtail option.
851	*/
852	int handle_receive_interrupt_nodma_rtail(struct hfi1_ctxtdata *rcd, int thread)
853	{
854	int last = RCV_PKT_OK;
855	struct hfi1_packet packet;
856
857	init_packet(rcd, packet: &packet);
858	if (last_rcv_seq(rcd, seq: rhf_rcv_seq(rhf: packet.rhf))) {
859	last = RCV_PKT_DONE;
860	goto bail;
861	}
862
863	prescan_rxq(rcd, &packet);
864
865	while (last == RCV_PKT_OK) {
866	last = process_rcv_packet(packet: &packet, thread);
867	if (hfi1_seq_incr(rcd, seq: rhf_rcv_seq(rhf: packet.rhf)))
868	last = RCV_PKT_DONE;
869	process_rcv_update(last, packet: &packet);
870	}
871	process_rcv_qp_work(packet: &packet);
872	hfi1_set_rcd_head(rcd, head: packet.rhqoff);
873	bail:
874	finish_packet(packet: &packet);
875	return last;
876	}
877
878	int handle_receive_interrupt_dma_rtail(struct hfi1_ctxtdata *rcd, int thread)
879	{
880	u32 hdrqtail;
881	int last = RCV_PKT_OK;
882	struct hfi1_packet packet;
883
884	init_packet(rcd, packet: &packet);
885	hdrqtail = get_rcvhdrtail(rcd);
886	if (packet.rhqoff == hdrqtail) {
887	last = RCV_PKT_DONE;
888	goto bail;
889	}
890	smp_rmb(); /* prevent speculative reads of dma'ed hdrq */
891
892	prescan_rxq(rcd, &packet);
893
894	while (last == RCV_PKT_OK) {
895	last = process_rcv_packet(packet: &packet, thread);
896	if (packet.rhqoff == hdrqtail)
897	last = RCV_PKT_DONE;
898	process_rcv_update(last, packet: &packet);
899	}
900	process_rcv_qp_work(packet: &packet);
901	hfi1_set_rcd_head(rcd, head: packet.rhqoff);
902	bail:
903	finish_packet(packet: &packet);
904	return last;
905	}
906
907	static void set_all_fastpath(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd)
908	{
909	u16 i;
910
911	/*
912	* For dynamically allocated kernel contexts (like vnic) switch
913	* interrupt handler only for that context. Otherwise, switch
914	* interrupt handler for all statically allocated kernel contexts.
915	*/
916	if (rcd->ctxt >= dd->first_dyn_alloc_ctxt && !rcd->is_vnic) {
917	hfi1_rcd_get(rcd);
918	hfi1_set_fast(rcd);
919	hfi1_rcd_put(rcd);
920	return;
921	}
922
923	for (i = HFI1_CTRL_CTXT + 1; i < dd->num_rcv_contexts; i++) {
924	rcd = hfi1_rcd_get_by_index(dd, ctxt: i);
925	if (rcd && (i < dd->first_dyn_alloc_ctxt || rcd->is_vnic))
926	hfi1_set_fast(rcd);
927	hfi1_rcd_put(rcd);
928	}
929	}
930
931	void set_all_slowpath(struct hfi1_devdata *dd)
932	{
933	struct hfi1_ctxtdata *rcd;
934	u16 i;
935
936	/* HFI1_CTRL_CTXT must always use the slow path interrupt handler */
937	for (i = HFI1_CTRL_CTXT + 1; i < dd->num_rcv_contexts; i++) {
938	rcd = hfi1_rcd_get_by_index(dd, ctxt: i);
939	if (!rcd)
940	continue;
941	if (i < dd->first_dyn_alloc_ctxt || rcd->is_vnic)
942	rcd->do_interrupt = rcd->slow_handler;
943
944	hfi1_rcd_put(rcd);
945	}
946	}
947
948	static bool __set_armed_to_active(struct hfi1_packet *packet)
949	{
950	u8 etype = rhf_rcv_type(rhf: packet->rhf);
951	u8 sc = SC15_PACKET;
952
953	if (etype == RHF_RCV_TYPE_IB) {
954	struct ib_header *hdr = hfi1_get_msgheader(rcd: packet->rcd,
955	rhf_addr: packet->rhf_addr);
956	sc = hfi1_9B_get_sc5(hdr, rhf: packet->rhf);
957	} else if (etype == RHF_RCV_TYPE_BYPASS) {
958	struct hfi1_16b_header *hdr = hfi1_get_16B_header(
959	rcd: packet->rcd,
960	rhf_addr: packet->rhf_addr);
961	sc = hfi1_16B_get_sc(hdr);
962	}
963	if (sc != SC15_PACKET) {
964	int hwstate = driver_lstate(ppd: packet->rcd->ppd);
965	struct work_struct *lsaw =
966	&packet->rcd->ppd->linkstate_active_work;
967
968	if (hwstate != IB_PORT_ACTIVE) {
969	dd_dev_info(packet->rcd->dd,
970	"Unexpected link state %s\n",
971	opa_lstate_name(hwstate));
972	return false;
973	}
974
975	queue_work(wq: packet->rcd->ppd->link_wq, work: lsaw);
976	return true;
977	}
978	return false;
979	}
980
981	/**
982	* set_armed_to_active - the fast path for armed to active
983	* @packet: the packet structure
984	*
985	* Return true if packet processing needs to bail.
986	*/
987	static bool set_armed_to_active(struct hfi1_packet *packet)
988	{
989	if (likely(packet->rcd->ppd->host_link_state != HLS_UP_ARMED))
990	return false;
991	return __set_armed_to_active(packet);
992	}
993
994	/*
995	* handle_receive_interrupt - receive a packet
996	* @rcd: the context
997	*
998	* Called from interrupt handler for errors or receive interrupt.
999	* This is the slow path interrupt handler.
1000	*/
1001	int handle_receive_interrupt(struct hfi1_ctxtdata *rcd, int thread)
1002	{
1003	struct hfi1_devdata *dd = rcd->dd;
1004	u32 hdrqtail;
1005	int needset, last = RCV_PKT_OK;
1006	struct hfi1_packet packet;
1007	int skip_pkt = 0;
1008
1009	if (!rcd->rcvhdrq)
1010	return RCV_PKT_OK;
1011	/* Control context will always use the slow path interrupt handler */
1012	needset = (rcd->ctxt == HFI1_CTRL_CTXT) ? 0 : 1;
1013
1014	init_packet(rcd, packet: &packet);
1015
1016	if (!get_dma_rtail_setting(rcd)) {
1017	if (last_rcv_seq(rcd, seq: rhf_rcv_seq(rhf: packet.rhf))) {
1018	last = RCV_PKT_DONE;
1019	goto bail;
1020	}
1021	hdrqtail = 0;
1022	} else {
1023	hdrqtail = get_rcvhdrtail(rcd);
1024	if (packet.rhqoff == hdrqtail) {
1025	last = RCV_PKT_DONE;
1026	goto bail;
1027	}
1028	smp_rmb(); /* prevent speculative reads of dma'ed hdrq */
1029
1030	/*
1031	* Control context can potentially receive an invalid
1032	* rhf. Drop such packets.
1033	*/
1034	if (rcd->ctxt == HFI1_CTRL_CTXT)
1035	if (last_rcv_seq(rcd, seq: rhf_rcv_seq(rhf: packet.rhf)))
1036	skip_pkt = 1;
1037	}
1038
1039	prescan_rxq(rcd, &packet);
1040
1041	while (last == RCV_PKT_OK) {
1042	if (hfi1_need_drop(dd)) {
1043	/* On to the next packet */
1044	packet.rhqoff += packet.rsize;
1045	packet.rhf_addr = (__le32 *)rcd->rcvhdrq +
1046	packet.rhqoff +
1047	rcd->rhf_offset;
1048	packet.rhf = rhf_to_cpu(rbuf: packet.rhf_addr);
1049
1050	} else if (skip_pkt) {
1051	last = skip_rcv_packet(packet: &packet, thread);
1052	skip_pkt = 0;
1053	} else {
1054	if (set_armed_to_active(&packet))
1055	goto bail;
1056	last = process_rcv_packet(packet: &packet, thread);
1057	}
1058
1059	if (!get_dma_rtail_setting(rcd)) {
1060	if (hfi1_seq_incr(rcd, seq: rhf_rcv_seq(rhf: packet.rhf)))
1061	last = RCV_PKT_DONE;
1062	} else {
1063	if (packet.rhqoff == hdrqtail)
1064	last = RCV_PKT_DONE;
1065	/*
1066	* Control context can potentially receive an invalid
1067	* rhf. Drop such packets.
1068	*/
1069	if (rcd->ctxt == HFI1_CTRL_CTXT) {
1070	bool lseq;
1071
1072	lseq = hfi1_seq_incr(rcd,
1073	seq: rhf_rcv_seq(rhf: packet.rhf));
1074	if (!last && lseq)
1075	skip_pkt = 1;
1076	}
1077	}
1078
1079	if (needset) {
1080	needset = false;
1081	set_all_fastpath(dd, rcd);
1082	}
1083	process_rcv_update(last, packet: &packet);
1084	}
1085
1086	process_rcv_qp_work(packet: &packet);
1087	hfi1_set_rcd_head(rcd, head: packet.rhqoff);
1088
1089	bail:
1090	/*
1091	* Always write head at end, and setup rcv interrupt, even
1092	* if no packets were processed.
1093	*/
1094	finish_packet(packet: &packet);
1095	return last;
1096	}
1097
1098	/*
1099	* handle_receive_interrupt_napi_sp - receive a packet
1100	* @rcd: the context
1101	* @budget: polling budget
1102	*
1103	* Called from interrupt handler for errors or receive interrupt.
1104	* This is the slow path interrupt handler
1105	* when executing napi soft irq environment.
1106	*/
1107	int handle_receive_interrupt_napi_sp(struct hfi1_ctxtdata *rcd, int budget)
1108	{
1109	struct hfi1_devdata *dd = rcd->dd;
1110	int last = RCV_PKT_OK;
1111	bool needset = true;
1112	struct hfi1_packet packet;
1113
1114	init_packet(rcd, packet: &packet);
1115	if (last_rcv_seq(rcd, seq: rhf_rcv_seq(rhf: packet.rhf)))
1116	goto bail;
1117
1118	while (last != RCV_PKT_DONE && packet.numpkt < budget) {
1119	if (hfi1_need_drop(dd)) {
1120	/* On to the next packet */
1121	packet.rhqoff += packet.rsize;
1122	packet.rhf_addr = (__le32 *)rcd->rcvhdrq +
1123	packet.rhqoff +
1124	rcd->rhf_offset;
1125	packet.rhf = rhf_to_cpu(rbuf: packet.rhf_addr);
1126
1127	} else {
1128	if (set_armed_to_active(&packet))
1129	goto bail;
1130	process_rcv_packet_napi(packet: &packet);
1131	}
1132
1133	if (hfi1_seq_incr(rcd, seq: rhf_rcv_seq(rhf: packet.rhf)))
1134	last = RCV_PKT_DONE;
1135
1136	if (needset) {
1137	needset = false;
1138	set_all_fastpath(dd, rcd);
1139	}
1140
1141	process_rcv_update(last, packet: &packet);
1142	}
1143
1144	hfi1_set_rcd_head(rcd, head: packet.rhqoff);
1145
1146	bail:
1147	/*
1148	* Always write head at end, and setup rcv interrupt, even
1149	* if no packets were processed.
1150	*/
1151	finish_packet(packet: &packet);
1152	return packet.numpkt;
1153	}
1154
1155	/*
1156	* We may discover in the interrupt that the hardware link state has
1157	* changed from ARMED to ACTIVE (due to the arrival of a non-SC15 packet),
1158	* and we need to update the driver's notion of the link state. We cannot
1159	* run set_link_state from interrupt context, so we queue this function on
1160	* a workqueue.
1161	*
1162	* We delay the regular interrupt processing until after the state changes
1163	* so that the link will be in the correct state by the time any application
1164	* we wake up attempts to send a reply to any message it received.
1165	* (Subsequent receive interrupts may possibly force the wakeup before we
1166	* update the link state.)
1167	*
1168	* The rcd is freed in hfi1_free_ctxtdata after hfi1_postinit_cleanup invokes
1169	* dd->f_cleanup(dd) to disable the interrupt handler and flush workqueues,
1170	* so we're safe from use-after-free of the rcd.
1171	*/
1172	void receive_interrupt_work(struct work_struct *work)
1173	{
1174	struct hfi1_pportdata *ppd = container_of(work, struct hfi1_pportdata,
1175	linkstate_active_work);
1176	struct hfi1_devdata *dd = ppd->dd;
1177	struct hfi1_ctxtdata *rcd;
1178	u16 i;
1179
1180	/* Received non-SC15 packet implies neighbor_normal */
1181	ppd->neighbor_normal = 1;
1182	set_link_state(ppd, HLS_UP_ACTIVE);
1183
1184	/*
1185	* Interrupt all statically allocated kernel contexts that could
1186	* have had an interrupt during auto activation.
1187	*/
1188	for (i = HFI1_CTRL_CTXT; i < dd->first_dyn_alloc_ctxt; i++) {
1189	rcd = hfi1_rcd_get_by_index(dd, ctxt: i);
1190	if (rcd)
1191	force_recv_intr(rcd);
1192	hfi1_rcd_put(rcd);
1193	}
1194	}
1195
1196	/*
1197	* Convert a given MTU size to the on-wire MAD packet enumeration.
1198	* Return -1 if the size is invalid.
1199	*/
1200	int mtu_to_enum(u32 mtu, int default_if_bad)
1201	{
1202	switch (mtu) {
1203	case 0: return OPA_MTU_0;
1204	case 256: return OPA_MTU_256;
1205	case 512: return OPA_MTU_512;
1206	case 1024: return OPA_MTU_1024;
1207	case 2048: return OPA_MTU_2048;
1208	case 4096: return OPA_MTU_4096;
1209	case 8192: return OPA_MTU_8192;
1210	case 10240: return OPA_MTU_10240;
1211	}
1212	return default_if_bad;
1213	}
1214
1215	u16 enum_to_mtu(int mtu)
1216	{
1217	switch (mtu) {
1218	case OPA_MTU_0: return 0;
1219	case OPA_MTU_256: return 256;
1220	case OPA_MTU_512: return 512;
1221	case OPA_MTU_1024: return 1024;
1222	case OPA_MTU_2048: return 2048;
1223	case OPA_MTU_4096: return 4096;
1224	case OPA_MTU_8192: return 8192;
1225	case OPA_MTU_10240: return 10240;
1226	default: return 0xffff;
1227	}
1228	}
1229
1230	/*
1231	* set_mtu - set the MTU
1232	* @ppd: the per port data
1233	*
1234	* We can handle "any" incoming size, the issue here is whether we
1235	* need to restrict our outgoing size. We do not deal with what happens
1236	* to programs that are already running when the size changes.
1237	*/
1238	int set_mtu(struct hfi1_pportdata *ppd)
1239	{
1240	struct hfi1_devdata *dd = ppd->dd;
1241	int i, drain, ret = 0, is_up = 0;
1242
1243	ppd->ibmtu = 0;
1244	for (i = 0; i < ppd->vls_supported; i++)
1245	if (ppd->ibmtu < dd->vld[i].mtu)
1246	ppd->ibmtu = dd->vld[i].mtu;
1247	ppd->ibmaxlen = ppd->ibmtu + lrh_max_header_bytes(dd: ppd->dd);
1248
1249	mutex_lock(&ppd->hls_lock);
1250	if (ppd->host_link_state == HLS_UP_INIT ||
1251	ppd->host_link_state == HLS_UP_ARMED ||
1252	ppd->host_link_state == HLS_UP_ACTIVE)
1253	is_up = 1;
1254
1255	drain = !is_ax(dd) && is_up;
1256
1257	if (drain)
1258	/*
1259	* MTU is specified per-VL. To ensure that no packet gets
1260	* stuck (due, e.g., to the MTU for the packet's VL being
1261	* reduced), empty the per-VL FIFOs before adjusting MTU.
1262	*/
1263	ret = stop_drain_data_vls(dd);
1264
1265	if (ret) {
1266	dd_dev_err(dd, "%s: cannot stop/drain VLs - refusing to change per-VL MTUs\n",
1267	__func__);
1268	goto err;
1269	}
1270
1271	hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_MTU, val: 0);
1272
1273	if (drain)
1274	open_fill_data_vls(dd); /* reopen all VLs */
1275
1276	err:
1277	mutex_unlock(lock: &ppd->hls_lock);
1278
1279	return ret;
1280	}
1281
1282	int hfi1_set_lid(struct hfi1_pportdata *ppd, u32 lid, u8 lmc)
1283	{
1284	struct hfi1_devdata *dd = ppd->dd;
1285
1286	ppd->lid = lid;
1287	ppd->lmc = lmc;
1288	hfi1_set_ib_cfg(ppd, HFI1_IB_CFG_LIDLMC, val: 0);
1289
1290	dd_dev_info(dd, "port %u: got a lid: 0x%x\n", ppd->port, lid);
1291
1292	return 0;
1293	}
1294
1295	void shutdown_led_override(struct hfi1_pportdata *ppd)
1296	{
1297	struct hfi1_devdata *dd = ppd->dd;
1298
1299	/*
1300	* This pairs with the memory barrier in hfi1_start_led_override to
1301	* ensure that we read the correct state of LED beaconing represented
1302	* by led_override_timer_active
1303	*/
1304	smp_rmb();
1305	if (atomic_read(v: &ppd->led_override_timer_active)) {
1306	del_timer_sync(timer: &ppd->led_override_timer);
1307	atomic_set(v: &ppd->led_override_timer_active, i: 0);
1308	/* Ensure the atomic_set is visible to all CPUs */
1309	smp_wmb();
1310	}
1311
1312	/* Hand control of the LED to the DC for normal operation */
1313	write_csr(dd, DCC_CFG_LED_CNTRL, value: 0);
1314	}
1315
1316	static void run_led_override(struct timer_list *t)
1317	{
1318	struct hfi1_pportdata *ppd = from_timer(ppd, t, led_override_timer);
1319	struct hfi1_devdata *dd = ppd->dd;
1320	unsigned long timeout;
1321	int phase_idx;
1322
1323	if (!(dd->flags & HFI1_INITTED))
1324	return;
1325
1326	phase_idx = ppd->led_override_phase & 1;
1327
1328	setextled(dd, on: phase_idx);
1329
1330	timeout = ppd->led_override_vals[phase_idx];
1331
1332	/* Set up for next phase */
1333	ppd->led_override_phase = !ppd->led_override_phase;
1334
1335	mod_timer(timer: &ppd->led_override_timer, expires: jiffies + timeout);
1336	}
1337
1338	/*
1339	* To have the LED blink in a particular pattern, provide timeon and timeoff
1340	* in milliseconds.
1341	* To turn off custom blinking and return to normal operation, use
1342	* shutdown_led_override()
1343	*/
1344	void hfi1_start_led_override(struct hfi1_pportdata *ppd, unsigned int timeon,
1345	unsigned int timeoff)
1346	{
1347	if (!(ppd->dd->flags & HFI1_INITTED))
1348	return;
1349
1350	/* Convert to jiffies for direct use in timer */
1351	ppd->led_override_vals[0] = msecs_to_jiffies(m: timeoff);
1352	ppd->led_override_vals[1] = msecs_to_jiffies(m: timeon);
1353
1354	/* Arbitrarily start from LED on phase */
1355	ppd->led_override_phase = 1;
1356
1357	/*
1358	* If the timer has not already been started, do so. Use a "quick"
1359	* timeout so the handler will be called soon to look at our request.
1360	*/
1361	if (!timer_pending(timer: &ppd->led_override_timer)) {
1362	timer_setup(&ppd->led_override_timer, run_led_override, 0);
1363	ppd->led_override_timer.expires = jiffies + 1;
1364	add_timer(timer: &ppd->led_override_timer);
1365	atomic_set(v: &ppd->led_override_timer_active, i: 1);
1366	/* Ensure the atomic_set is visible to all CPUs */
1367	smp_wmb();
1368	}
1369	}
1370
1371	/**
1372	* hfi1_reset_device - reset the chip if possible
1373	* @unit: the device to reset
1374	*
1375	* Whether or not reset is successful, we attempt to re-initialize the chip
1376	* (that is, much like a driver unload/reload). We clear the INITTED flag
1377	* so that the various entry points will fail until we reinitialize. For
1378	* now, we only allow this if no user contexts are open that use chip resources
1379	*/
1380	int hfi1_reset_device(int unit)
1381	{
1382	int ret;
1383	struct hfi1_devdata *dd = hfi1_lookup(unit);
1384	struct hfi1_pportdata *ppd;
1385	int pidx;
1386
1387	if (!dd) {
1388	ret = -ENODEV;
1389	goto bail;
1390	}
1391
1392	dd_dev_info(dd, "Reset on unit %u requested\n", unit);
1393
1394	if (!dd->kregbase1 || !(dd->flags & HFI1_PRESENT)) {
1395	dd_dev_info(dd,
1396	"Invalid unit number %u or not initialized or not present\n",
1397	unit);
1398	ret = -ENXIO;
1399	goto bail;
1400	}
1401
1402	/* If there are any user/vnic contexts, we cannot reset */
1403	mutex_lock(&hfi1_mutex);
1404	if (dd->rcd)
1405	if (hfi1_stats.sps_ctxts) {
1406	mutex_unlock(lock: &hfi1_mutex);
1407	ret = -EBUSY;
1408	goto bail;
1409	}
1410	mutex_unlock(lock: &hfi1_mutex);
1411
1412	for (pidx = 0; pidx < dd->num_pports; ++pidx) {
1413	ppd = dd->pport + pidx;
1414
1415	shutdown_led_override(ppd);
1416	}
1417	if (dd->flags & HFI1_HAS_SEND_DMA)
1418	sdma_exit(dd);
1419
1420	hfi1_reset_cpu_counters(dd);
1421
1422	ret = hfi1_init(dd, reinit: 1);
1423
1424	if (ret)
1425	dd_dev_err(dd,
1426	"Reinitialize unit %u after reset failed with %d\n",
1427	unit, ret);
1428	else
1429	dd_dev_info(dd, "Reinitialized unit %u after resetting\n",
1430	unit);
1431
1432	bail:
1433	return ret;
1434	}
1435
1436	static inline void hfi1_setup_ib_header(struct hfi1_packet *packet)
1437	{
1438	packet->hdr = (struct hfi1_ib_message_header *)
1439	hfi1_get_msgheader(rcd: packet->rcd,
1440	rhf_addr: packet->rhf_addr);
1441	packet->hlen = (u8 *)packet->rhf_addr - (u8 *)packet->hdr;
1442	}
1443
1444	static int hfi1_bypass_ingress_pkt_check(struct hfi1_packet *packet)
1445	{
1446	struct hfi1_pportdata *ppd = packet->rcd->ppd;
1447
1448	/* slid and dlid cannot be 0 */
1449	if ((!packet->slid) || (!packet->dlid))
1450	return -EINVAL;
1451
1452	/* Compare port lid with incoming packet dlid */
1453	if ((!(hfi1_is_16B_mcast(lid: packet->dlid))) &&
1454	(packet->dlid !=
1455	opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE), 16B))) {
1456	if ((packet->dlid & ~((1 << ppd->lmc) - 1)) != ppd->lid)
1457	return -EINVAL;
1458	}
1459
1460	/* No multicast packets with SC15 */
1461	if ((hfi1_is_16B_mcast(lid: packet->dlid)) && (packet->sc == 0xF))
1462	return -EINVAL;
1463
1464	/* Packets with permissive DLID always on SC15 */
1465	if ((packet->dlid == opa_get_lid(be32_to_cpu(OPA_LID_PERMISSIVE),
1466	16B)) &&
1467	(packet->sc != 0xF))
1468	return -EINVAL;
1469
1470	return 0;
1471	}
1472
1473	static int hfi1_setup_9B_packet(struct hfi1_packet *packet)
1474	{
1475	struct hfi1_ibport *ibp = rcd_to_iport(rcd: packet->rcd);
1476	struct ib_header *hdr;
1477	u8 lnh;
1478
1479	hfi1_setup_ib_header(packet);
1480	hdr = packet->hdr;
1481
1482	lnh = ib_get_lnh(hdr);
1483	if (lnh == HFI1_LRH_BTH) {
1484	packet->ohdr = &hdr->u.oth;
1485	packet->grh = NULL;
1486	} else if (lnh == HFI1_LRH_GRH) {
1487	u32 vtf;
1488
1489	packet->ohdr = &hdr->u.l.oth;
1490	packet->grh = &hdr->u.l.grh;
1491	if (packet->grh->next_hdr != IB_GRH_NEXT_HDR)
1492	goto drop;
1493	vtf = be32_to_cpu(packet->grh->version_tclass_flow);
1494	if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
1495	goto drop;
1496	} else {
1497	goto drop;
1498	}
1499
1500	/* Query commonly used fields from packet header */
1501	packet->payload = packet->ebuf;
1502	packet->opcode = ib_bth_get_opcode(ohdr: packet->ohdr);
1503	packet->slid = ib_get_slid(hdr);
1504	packet->dlid = ib_get_dlid(hdr);
1505	if (unlikely((packet->dlid >= be16_to_cpu(IB_MULTICAST_LID_BASE)) &&
1506	(packet->dlid != be16_to_cpu(IB_LID_PERMISSIVE))))
1507	packet->dlid += opa_get_mcast_base(OPA_MCAST_NR) -
1508	be16_to_cpu(IB_MULTICAST_LID_BASE);
1509	packet->sl = ib_get_sl(hdr);
1510	packet->sc = hfi1_9B_get_sc5(hdr, rhf: packet->rhf);
1511	packet->pad = ib_bth_get_pad(ohdr: packet->ohdr);
1512	packet->extra_byte = 0;
1513	packet->pkey = ib_bth_get_pkey(ohdr: packet->ohdr);
1514	packet->migrated = ib_bth_is_migration(ohdr: packet->ohdr);
1515
1516	return 0;
1517	drop:
1518	ibp->rvp.n_pkt_drops++;
1519	return -EINVAL;
1520	}
1521
1522	static int hfi1_setup_bypass_packet(struct hfi1_packet *packet)
1523	{
1524	/*
1525	* Bypass packets have a different header/payload split
1526	* compared to an IB packet.
1527	* Current split is set such that 16 bytes of the actual
1528	* header is in the header buffer and the remining is in
1529	* the eager buffer. We chose 16 since hfi1 driver only
1530	* supports 16B bypass packets and we will be able to
1531	* receive the entire LRH with such a split.
1532	*/
1533
1534	struct hfi1_ctxtdata *rcd = packet->rcd;
1535	struct hfi1_pportdata *ppd = rcd->ppd;
1536	struct hfi1_ibport *ibp = &ppd->ibport_data;
1537	u8 l4;
1538
1539	packet->hdr = (struct hfi1_16b_header *)
1540	hfi1_get_16B_header(rcd: packet->rcd,
1541	rhf_addr: packet->rhf_addr);
1542	l4 = hfi1_16B_get_l4(hdr: packet->hdr);
1543	if (l4 == OPA_16B_L4_IB_LOCAL) {
1544	packet->ohdr = packet->ebuf;
1545	packet->grh = NULL;
1546	packet->opcode = ib_bth_get_opcode(ohdr: packet->ohdr);
1547	packet->pad = hfi1_16B_bth_get_pad(ohdr: packet->ohdr);
1548	/* hdr_len_by_opcode already has an IB LRH factored in */
1549	packet->hlen = hdr_len_by_opcode[packet->opcode] +
1550	(LRH_16B_BYTES - LRH_9B_BYTES);
1551	packet->migrated = opa_bth_is_migration(ohdr: packet->ohdr);
1552	} else if (l4 == OPA_16B_L4_IB_GLOBAL) {
1553	u32 vtf;
1554	u8 grh_len = sizeof(struct ib_grh);
1555
1556	packet->ohdr = packet->ebuf + grh_len;
1557	packet->grh = packet->ebuf;
1558	packet->opcode = ib_bth_get_opcode(ohdr: packet->ohdr);
1559	packet->pad = hfi1_16B_bth_get_pad(ohdr: packet->ohdr);
1560	/* hdr_len_by_opcode already has an IB LRH factored in */
1561	packet->hlen = hdr_len_by_opcode[packet->opcode] +
1562	(LRH_16B_BYTES - LRH_9B_BYTES) + grh_len;
1563	packet->migrated = opa_bth_is_migration(ohdr: packet->ohdr);
1564
1565	if (packet->grh->next_hdr != IB_GRH_NEXT_HDR)
1566	goto drop;
1567	vtf = be32_to_cpu(packet->grh->version_tclass_flow);
1568	if ((vtf >> IB_GRH_VERSION_SHIFT) != IB_GRH_VERSION)
1569	goto drop;
1570	} else if (l4 == OPA_16B_L4_FM) {
1571	packet->mgmt = packet->ebuf;
1572	packet->ohdr = NULL;
1573	packet->grh = NULL;
1574	packet->opcode = IB_OPCODE_UD_SEND_ONLY;
1575	packet->pad = OPA_16B_L4_FM_PAD;
1576	packet->hlen = OPA_16B_L4_FM_HLEN;
1577	packet->migrated = false;
1578	} else {
1579	goto drop;
1580	}
1581
1582	/* Query commonly used fields from packet header */
1583	packet->payload = packet->ebuf + packet->hlen - LRH_16B_BYTES;
1584	packet->slid = hfi1_16B_get_slid(hdr: packet->hdr);
1585	packet->dlid = hfi1_16B_get_dlid(hdr: packet->hdr);
1586	if (unlikely(hfi1_is_16B_mcast(packet->dlid)))
1587	packet->dlid += opa_get_mcast_base(OPA_MCAST_NR) -
1588	opa_get_lid(opa_get_mcast_base(OPA_MCAST_NR),
1589	16B);
1590	packet->sc = hfi1_16B_get_sc(hdr: packet->hdr);
1591	packet->sl = ibp->sc_to_sl[packet->sc];
1592	packet->extra_byte = SIZE_OF_LT;
1593	packet->pkey = hfi1_16B_get_pkey(hdr: packet->hdr);
1594
1595	if (hfi1_bypass_ingress_pkt_check(packet))
1596	goto drop;
1597
1598	return 0;
1599	drop:
1600	hfi1_cdbg(PKT, "%s: packet dropped", __func__);
1601	ibp->rvp.n_pkt_drops++;
1602	return -EINVAL;
1603	}
1604
1605	static void show_eflags_errs(struct hfi1_packet *packet)
1606	{
1607	struct hfi1_ctxtdata *rcd = packet->rcd;
1608	u32 rte = rhf_rcv_type_err(rhf: packet->rhf);
1609
1610	dd_dev_err(rcd->dd,
1611	"receive context %d: rhf 0x%016llx, errs [ %s%s%s%s%s%s%s] rte 0x%x\n",
1612	rcd->ctxt, packet->rhf,
1613	packet->rhf & RHF_K_HDR_LEN_ERR ? "k_hdr_len " : "",
1614	packet->rhf & RHF_DC_UNC_ERR ? "dc_unc " : "",
1615	packet->rhf & RHF_DC_ERR ? "dc " : "",
1616	packet->rhf & RHF_TID_ERR ? "tid " : "",
1617	packet->rhf & RHF_LEN_ERR ? "len " : "",
1618	packet->rhf & RHF_ECC_ERR ? "ecc " : "",
1619	packet->rhf & RHF_ICRC_ERR ? "icrc " : "",
1620	rte);
1621	}
1622
1623	void handle_eflags(struct hfi1_packet *packet)
1624	{
1625	struct hfi1_ctxtdata *rcd = packet->rcd;
1626
1627	rcv_hdrerr(rcd, ppd: rcd->ppd, packet);
1628	if (rhf_err_flags(rhf: packet->rhf))
1629	show_eflags_errs(packet);
1630	}
1631
1632	static void hfi1_ipoib_ib_rcv(struct hfi1_packet *packet)
1633	{
1634	struct hfi1_ibport *ibp;
1635	struct net_device *netdev;
1636	struct hfi1_ctxtdata *rcd = packet->rcd;
1637	struct napi_struct *napi = rcd->napi;
1638	struct sk_buff *skb;
1639	struct hfi1_netdev_rxq *rxq = container_of(napi,
1640	struct hfi1_netdev_rxq, napi);
1641	u32 extra_bytes;
1642	u32 tlen, qpnum;
1643	bool do_work, do_cnp;
1644
1645	trace_hfi1_rcvhdr(packet);
1646
1647	hfi1_setup_ib_header(packet);
1648
1649	packet->ohdr = &((struct ib_header *)packet->hdr)->u.oth;
1650	packet->grh = NULL;
1651
1652	if (unlikely(rhf_err_flags(packet->rhf))) {
1653	handle_eflags(packet);
1654	return;
1655	}
1656
1657	qpnum = ib_bth_get_qpn(ohdr: packet->ohdr);
1658	netdev = hfi1_netdev_get_data(dd: rcd->dd, id: qpnum);
1659	if (!netdev)
1660	goto drop_no_nd;
1661
1662	trace_input_ibhdr(dd: rcd->dd, packet, sc5: !!(rhf_dc_info(rhf: packet->rhf)));
1663	trace_ctxt_rsm_hist(ctxt: rcd->ctxt);
1664
1665	/* handle congestion notifications */
1666	do_work = hfi1_may_ecn(pkt: packet);
1667	if (unlikely(do_work)) {
1668	do_cnp = (packet->opcode != IB_OPCODE_CNP);
1669	(void)hfi1_process_ecn_slowpath(qp: hfi1_ipoib_priv(dev: netdev)->qp,
1670	pkt: packet, prescan: do_cnp);
1671	}
1672
1673	/*
1674	* We have split point after last byte of DETH
1675	* lets strip padding and CRC and ICRC.
1676	* tlen is whole packet len so we need to
1677	* subtract header size as well.
1678	*/
1679	tlen = packet->tlen;
1680	extra_bytes = ib_bth_get_pad(ohdr: packet->ohdr) + (SIZE_OF_CRC << 2) +
1681	packet->hlen;
1682	if (unlikely(tlen < extra_bytes))
1683	goto drop;
1684
1685	tlen -= extra_bytes;
1686
1687	skb = hfi1_ipoib_prepare_skb(rxq, size: tlen, data: packet->ebuf);
1688	if (unlikely(!skb))
1689	goto drop;
1690
1691	dev_sw_netstats_rx_add(dev: netdev, len: skb->len);
1692
1693	skb->dev = netdev;
1694	skb->pkt_type = PACKET_HOST;
1695	netif_receive_skb(skb);
1696
1697	return;
1698
1699	drop:
1700	++netdev->stats.rx_dropped;
1701	drop_no_nd:
1702	ibp = rcd_to_iport(rcd: packet->rcd);
1703	++ibp->rvp.n_pkt_drops;
1704	}
1705
1706	/*
1707	* The following functions are called by the interrupt handler. They are type
1708	* specific handlers for each packet type.
1709	*/
1710	static void process_receive_ib(struct hfi1_packet *packet)
1711	{
1712	if (hfi1_setup_9B_packet(packet))
1713	return;
1714
1715	if (unlikely(hfi1_dbg_should_fault_rx(packet)))
1716	return;
1717
1718	trace_hfi1_rcvhdr(packet);
1719
1720	if (unlikely(rhf_err_flags(packet->rhf))) {
1721	handle_eflags(packet);
1722	return;
1723	}
1724
1725	hfi1_ib_rcv(packet);
1726	}
1727
1728	static void process_receive_bypass(struct hfi1_packet *packet)
1729	{
1730	struct hfi1_devdata *dd = packet->rcd->dd;
1731
1732	if (hfi1_setup_bypass_packet(packet))
1733	return;
1734
1735	trace_hfi1_rcvhdr(packet);
1736
1737	if (unlikely(rhf_err_flags(packet->rhf))) {
1738	handle_eflags(packet);
1739	return;
1740	}
1741
1742	if (hfi1_16B_get_l2(hdr: packet->hdr) == 0x2) {
1743	hfi1_16B_rcv(packet);
1744	} else {
1745	dd_dev_err(dd,
1746	"Bypass packets other than 16B are not supported in normal operation. Dropping\n");
1747	incr_cntr64(cntr: &dd->sw_rcv_bypass_packet_errors);
1748	if (!(dd->err_info_rcvport.status_and_code &
1749	OPA_EI_STATUS_SMASK)) {
1750	u64 *flits = packet->ebuf;
1751
1752	if (flits && !(packet->rhf & RHF_LEN_ERR)) {
1753	dd->err_info_rcvport.packet_flit1 = flits[0];
1754	dd->err_info_rcvport.packet_flit2 =
1755	packet->tlen > sizeof(flits[0]) ?
1756	flits[1] : 0;
1757	}
1758	dd->err_info_rcvport.status_and_code |=
1759	(OPA_EI_STATUS_SMASK | BAD_L2_ERR);
1760	}
1761	}
1762	}
1763
1764	static void process_receive_error(struct hfi1_packet *packet)
1765	{
1766	/* KHdrHCRCErr -- KDETH packet with a bad HCRC */
1767	if (unlikely(
1768	hfi1_dbg_fault_suppress_err(&packet->rcd->dd->verbs_dev) &&
1769	(rhf_rcv_type_err(packet->rhf) == RHF_RCV_TYPE_ERROR ||
1770	packet->rhf & RHF_DC_ERR)))
1771	return;
1772
1773	hfi1_setup_ib_header(packet);
1774	handle_eflags(packet);
1775
1776	if (unlikely(rhf_err_flags(packet->rhf)))
1777	dd_dev_err(packet->rcd->dd,
1778	"Unhandled error packet received. Dropping.\n");
1779	}
1780
1781	static void kdeth_process_expected(struct hfi1_packet *packet)
1782	{
1783	hfi1_setup_9B_packet(packet);
1784	if (unlikely(hfi1_dbg_should_fault_rx(packet)))
1785	return;
1786
1787	if (unlikely(rhf_err_flags(packet->rhf))) {
1788	struct hfi1_ctxtdata *rcd = packet->rcd;
1789
1790	if (hfi1_handle_kdeth_eflags(rcd, ppd: rcd->ppd, packet))
1791	return;
1792	}
1793
1794	hfi1_kdeth_expected_rcv(packet);
1795	}
1796
1797	static void kdeth_process_eager(struct hfi1_packet *packet)
1798	{
1799	hfi1_setup_9B_packet(packet);
1800	if (unlikely(hfi1_dbg_should_fault_rx(packet)))
1801	return;
1802
1803	trace_hfi1_rcvhdr(packet);
1804	if (unlikely(rhf_err_flags(packet->rhf))) {
1805	struct hfi1_ctxtdata *rcd = packet->rcd;
1806
1807	show_eflags_errs(packet);
1808	if (hfi1_handle_kdeth_eflags(rcd, ppd: rcd->ppd, packet))
1809	return;
1810	}
1811
1812	hfi1_kdeth_eager_rcv(packet);
1813	}
1814
1815	static void process_receive_invalid(struct hfi1_packet *packet)
1816	{
1817	dd_dev_err(packet->rcd->dd, "Invalid packet type %d. Dropping\n",
1818	rhf_rcv_type(packet->rhf));
1819	}
1820
1821	#define HFI1_RCVHDR_DUMP_MAX 5
1822
1823	void seqfile_dump_rcd(struct seq_file *s, struct hfi1_ctxtdata *rcd)
1824	{
1825	struct hfi1_packet packet;
1826	struct ps_mdata mdata;
1827	int i;
1828
1829	seq_printf(m: s, fmt: "Rcd %u: RcvHdr cnt %u entsize %u %s ctrl 0x%08llx status 0x%08llx, head %llu tail %llu sw head %u\n",
1830	rcd->ctxt, get_hdrq_cnt(rcd), get_hdrqentsize(rcd),
1831	get_dma_rtail_setting(rcd) ?
1832	"dma_rtail" : "nodma_rtail",
1833	read_kctxt_csr(dd: rcd->dd, ctxt: rcd->ctxt, RCV_CTXT_CTRL),
1834	read_kctxt_csr(dd: rcd->dd, ctxt: rcd->ctxt, RCV_CTXT_STATUS),
1835	read_uctxt_csr(dd: rcd->dd, ctxt: rcd->ctxt, RCV_HDR_HEAD) &
1836	RCV_HDR_HEAD_HEAD_MASK,
1837	read_uctxt_csr(dd: rcd->dd, ctxt: rcd->ctxt, RCV_HDR_TAIL),
1838	rcd->head);
1839
1840	init_packet(rcd, packet: &packet);
1841	init_ps_mdata(mdata: &mdata, packet: &packet);
1842
1843	for (i = 0; i < HFI1_RCVHDR_DUMP_MAX; i++) {
1844	__le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +
1845	rcd->rhf_offset;
1846	struct ib_header *hdr;
1847	u64 rhf = rhf_to_cpu(rbuf: rhf_addr);
1848	u32 etype = rhf_rcv_type(rhf), qpn;
1849	u8 opcode;
1850	u32 psn;
1851	u8 lnh;
1852
1853	if (ps_done(mdata: &mdata, rhf, rcd))
1854	break;
1855
1856	if (ps_skip(mdata: &mdata, rhf, rcd))
1857	goto next;
1858
1859	if (etype > RHF_RCV_TYPE_IB)
1860	goto next;
1861
1862	packet.hdr = hfi1_get_msgheader(rcd, rhf_addr);
1863	hdr = packet.hdr;
1864
1865	lnh = be16_to_cpu(hdr->lrh[0]) & 3;
1866
1867	if (lnh == HFI1_LRH_BTH)
1868	packet.ohdr = &hdr->u.oth;
1869	else if (lnh == HFI1_LRH_GRH)
1870	packet.ohdr = &hdr->u.l.oth;
1871	else
1872	goto next; /* just in case */
1873
1874	opcode = (be32_to_cpu(packet.ohdr->bth[0]) >> 24);
1875	qpn = be32_to_cpu(packet.ohdr->bth[1]) & RVT_QPN_MASK;
1876	psn = mask_psn(be32_to_cpu(packet.ohdr->bth[2]));
1877
1878	seq_printf(m: s, fmt: "\tEnt %u: opcode 0x%x, qpn 0x%x, psn 0x%x\n",
1879	mdata.ps_head, opcode, qpn, psn);
1880	next:
1881	update_ps_mdata(mdata: &mdata, rcd);
1882	}
1883	}
1884
1885	const rhf_rcv_function_ptr normal_rhf_rcv_functions[] = {
1886	[RHF_RCV_TYPE_EXPECTED] = kdeth_process_expected,
1887	[RHF_RCV_TYPE_EAGER] = kdeth_process_eager,
1888	[RHF_RCV_TYPE_IB] = process_receive_ib,
1889	[RHF_RCV_TYPE_ERROR] = process_receive_error,
1890	[RHF_RCV_TYPE_BYPASS] = process_receive_bypass,
1891	[RHF_RCV_TYPE_INVALID5] = process_receive_invalid,
1892	[RHF_RCV_TYPE_INVALID6] = process_receive_invalid,
1893	[RHF_RCV_TYPE_INVALID7] = process_receive_invalid,
1894	};
1895
1896	const rhf_rcv_function_ptr netdev_rhf_rcv_functions[] = {
1897	[RHF_RCV_TYPE_EXPECTED] = process_receive_invalid,
1898	[RHF_RCV_TYPE_EAGER] = process_receive_invalid,
1899	[RHF_RCV_TYPE_IB] = hfi1_ipoib_ib_rcv,
1900	[RHF_RCV_TYPE_ERROR] = process_receive_error,
1901	[RHF_RCV_TYPE_BYPASS] = hfi1_vnic_bypass_rcv,
1902	[RHF_RCV_TYPE_INVALID5] = process_receive_invalid,
1903	[RHF_RCV_TYPE_INVALID6] = process_receive_invalid,
1904	[RHF_RCV_TYPE_INVALID7] = process_receive_invalid,
1905	};
1906