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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc 
 kernel/drivers/infiniband/hw/qib/qib_ruc.c
....@@ -171,312 +171,6 @@
171171 }
172172 
173173 /**
174
- * qib_ruc_loopback - handle UC and RC lookback requests
175
- * @sqp: the sending QP
176
- *
177
- * This is called from qib_do_send() to
178
- * forward a WQE addressed to the same HCA.
179
- * Note that although we are single threaded due to the tasklet, we still
180
- * have to protect against post_send().  We don't have to worry about
181
- * receive interrupts since this is a connected protocol and all packets
182
- * will pass through here.
183
- */
184
-static void qib_ruc_loopback(struct rvt_qp *sqp)
185
-{
186
-	struct qib_ibport *ibp = to_iport(sqp->ibqp.device, sqp->port_num);
187
-	struct qib_pportdata *ppd = ppd_from_ibp(ibp);
188
-	struct qib_devdata *dd = ppd->dd;
189
-	struct rvt_dev_info *rdi = &dd->verbs_dev.rdi;
190
-	struct rvt_qp *qp;
191
-	struct rvt_swqe *wqe;
192
-	struct rvt_sge *sge;
193
-	unsigned long flags;
194
-	struct ib_wc wc;
195
-	u64 sdata;
196
-	atomic64_t *maddr;
197
-	enum ib_wc_status send_status;
198
-	int release;
199
-	int ret;
200
-
201
-	rcu_read_lock();
202
-	/*
203
-	 * Note that we check the responder QP state after
204
-	 * checking the requester's state.
205
-	 */
206
-	qp = rvt_lookup_qpn(rdi, &ibp->rvp, sqp->remote_qpn);
207
-	if (!qp)
208
-		goto done;
209
-
210
-	spin_lock_irqsave(&sqp->s_lock, flags);
211
-
212
-	/* Return if we are already busy processing a work request. */
213
-	if ((sqp->s_flags & (RVT_S_BUSY | RVT_S_ANY_WAIT)) ||
214
-	    !(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_OR_FLUSH_SEND))
215
-		goto unlock;
216
-
217
-	sqp->s_flags |= RVT_S_BUSY;
218
-
219
-again:
220
-	if (sqp->s_last == READ_ONCE(sqp->s_head))
221
-		goto clr_busy;
222
-	wqe = rvt_get_swqe_ptr(sqp, sqp->s_last);
223
-
224
-	/* Return if it is not OK to start a new work reqeust. */
225
-	if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_NEXT_SEND_OK)) {
226
-		if (!(ib_rvt_state_ops[sqp->state] & RVT_FLUSH_SEND))
227
-			goto clr_busy;
228
-		/* We are in the error state, flush the work request. */
229
-		send_status = IB_WC_WR_FLUSH_ERR;
230
-		goto flush_send;
231
-	}
232
-
233
-	/*
234
-	 * We can rely on the entry not changing without the s_lock
235
-	 * being held until we update s_last.
236
-	 * We increment s_cur to indicate s_last is in progress.
237
-	 */
238
-	if (sqp->s_last == sqp->s_cur) {
239
-		if (++sqp->s_cur >= sqp->s_size)
240
-			sqp->s_cur = 0;
241
-	}
242
-	spin_unlock_irqrestore(&sqp->s_lock, flags);
243
-
244
-	if (!qp || !(ib_rvt_state_ops[qp->state] & RVT_PROCESS_RECV_OK) ||
245
-	    qp->ibqp.qp_type != sqp->ibqp.qp_type) {
246
-		ibp->rvp.n_pkt_drops++;
247
-		/*
248
-		 * For RC, the requester would timeout and retry so
249
-		 * shortcut the timeouts and just signal too many retries.
250
-		 */
251
-		if (sqp->ibqp.qp_type == IB_QPT_RC)
252
-			send_status = IB_WC_RETRY_EXC_ERR;
253
-		else
254
-			send_status = IB_WC_SUCCESS;
255
-		goto serr;
256
-	}
257
-
258
-	memset(&wc, 0, sizeof(wc));
259
-	send_status = IB_WC_SUCCESS;
260
-
261
-	release = 1;
262
-	sqp->s_sge.sge = wqe->sg_list[0];
263
-	sqp->s_sge.sg_list = wqe->sg_list + 1;
264
-	sqp->s_sge.num_sge = wqe->wr.num_sge;
265
-	sqp->s_len = wqe->length;
266
-	switch (wqe->wr.opcode) {
267
-	case IB_WR_SEND_WITH_IMM:
268
-		wc.wc_flags = IB_WC_WITH_IMM;
269
-		wc.ex.imm_data = wqe->wr.ex.imm_data;
270
-		/* FALLTHROUGH */
271
-	case IB_WR_SEND:
272
-		ret = rvt_get_rwqe(qp, false);
273
-		if (ret < 0)
274
-			goto op_err;
275
-		if (!ret)
276
-			goto rnr_nak;
277
-		if (wqe->length > qp->r_len)
278
-			goto inv_err;
279
-		break;
280
-
281
-	case IB_WR_RDMA_WRITE_WITH_IMM:
282
-		if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE)))
283
-			goto inv_err;
284
-		wc.wc_flags = IB_WC_WITH_IMM;
285
-		wc.ex.imm_data = wqe->wr.ex.imm_data;
286
-		ret = rvt_get_rwqe(qp, true);
287
-		if (ret < 0)
288
-			goto op_err;
289
-		if (!ret)
290
-			goto rnr_nak;
291
-		/* FALLTHROUGH */
292
-	case IB_WR_RDMA_WRITE:
293
-		if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_WRITE)))
294
-			goto inv_err;
295
-		if (wqe->length == 0)
296
-			break;
297
-		if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, wqe->length,
298
-					  wqe->rdma_wr.remote_addr,
299
-					  wqe->rdma_wr.rkey,
300
-					  IB_ACCESS_REMOTE_WRITE)))
301
-			goto acc_err;
302
-		qp->r_sge.sg_list = NULL;
303
-		qp->r_sge.num_sge = 1;
304
-		qp->r_sge.total_len = wqe->length;
305
-		break;
306
-
307
-	case IB_WR_RDMA_READ:
308
-		if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_READ)))
309
-			goto inv_err;
310
-		if (unlikely(!rvt_rkey_ok(qp, &sqp->s_sge.sge, wqe->length,
311
-					  wqe->rdma_wr.remote_addr,
312
-					  wqe->rdma_wr.rkey,
313
-					  IB_ACCESS_REMOTE_READ)))
314
-			goto acc_err;
315
-		release = 0;
316
-		sqp->s_sge.sg_list = NULL;
317
-		sqp->s_sge.num_sge = 1;
318
-		qp->r_sge.sge = wqe->sg_list[0];
319
-		qp->r_sge.sg_list = wqe->sg_list + 1;
320
-		qp->r_sge.num_sge = wqe->wr.num_sge;
321
-		qp->r_sge.total_len = wqe->length;
322
-		break;
323
-
324
-	case IB_WR_ATOMIC_CMP_AND_SWP:
325
-	case IB_WR_ATOMIC_FETCH_AND_ADD:
326
-		if (unlikely(!(qp->qp_access_flags & IB_ACCESS_REMOTE_ATOMIC)))
327
-			goto inv_err;
328
-		if (unlikely(!rvt_rkey_ok(qp, &qp->r_sge.sge, sizeof(u64),
329
-					  wqe->atomic_wr.remote_addr,
330
-					  wqe->atomic_wr.rkey,
331
-					  IB_ACCESS_REMOTE_ATOMIC)))
332
-			goto acc_err;
333
-		/* Perform atomic OP and save result. */
334
-		maddr = (atomic64_t *) qp->r_sge.sge.vaddr;
335
-		sdata = wqe->atomic_wr.compare_add;
336
-		*(u64 *) sqp->s_sge.sge.vaddr =
337
-			(wqe->atomic_wr.wr.opcode == IB_WR_ATOMIC_FETCH_AND_ADD) ?
338
-			(u64) atomic64_add_return(sdata, maddr) - sdata :
339
-			(u64) cmpxchg((u64 *) qp->r_sge.sge.vaddr,
340
-				      sdata, wqe->atomic_wr.swap);
341
-		rvt_put_mr(qp->r_sge.sge.mr);
342
-		qp->r_sge.num_sge = 0;
343
-		goto send_comp;
344
-
345
-	default:
346
-		send_status = IB_WC_LOC_QP_OP_ERR;
347
-		goto serr;
348
-	}
349
-
350
-	sge = &sqp->s_sge.sge;
351
-	while (sqp->s_len) {
352
-		u32 len = sqp->s_len;
353
-
354
-		if (len > sge->length)
355
-			len = sge->length;
356
-		if (len > sge->sge_length)
357
-			len = sge->sge_length;
358
-		BUG_ON(len == 0);
359
-		qib_copy_sge(&qp->r_sge, sge->vaddr, len, release);
360
-		sge->vaddr += len;
361
-		sge->length -= len;
362
-		sge->sge_length -= len;
363
-		if (sge->sge_length == 0) {
364
-			if (!release)
365
-				rvt_put_mr(sge->mr);
366
-			if (--sqp->s_sge.num_sge)
367
-				*sge = *sqp->s_sge.sg_list++;
368
-		} else if (sge->length == 0 && sge->mr->lkey) {
369
-			if (++sge->n >= RVT_SEGSZ) {
370
-				if (++sge->m >= sge->mr->mapsz)
371
-					break;
372
-				sge->n = 0;
373
-			}
374
-			sge->vaddr =
375
-				sge->mr->map[sge->m]->segs[sge->n].vaddr;
376
-			sge->length =
377
-				sge->mr->map[sge->m]->segs[sge->n].length;
378
-		}
379
-		sqp->s_len -= len;
380
-	}
381
-	if (release)
382
-		rvt_put_ss(&qp->r_sge);
383
-
384
-	if (!test_and_clear_bit(RVT_R_WRID_VALID, &qp->r_aflags))
385
-		goto send_comp;
386
-
387
-	if (wqe->wr.opcode == IB_WR_RDMA_WRITE_WITH_IMM)
388
-		wc.opcode = IB_WC_RECV_RDMA_WITH_IMM;
389
-	else
390
-		wc.opcode = IB_WC_RECV;
391
-	wc.wr_id = qp->r_wr_id;
392
-	wc.status = IB_WC_SUCCESS;
393
-	wc.byte_len = wqe->length;
394
-	wc.qp = &qp->ibqp;
395
-	wc.src_qp = qp->remote_qpn;
396
-	wc.slid = rdma_ah_get_dlid(&qp->remote_ah_attr);
397
-	wc.sl = rdma_ah_get_sl(&qp->remote_ah_attr);
398
-	wc.port_num = 1;
399
-	/* Signal completion event if the solicited bit is set. */
400
-	rvt_cq_enter(ibcq_to_rvtcq(qp->ibqp.recv_cq), &wc,
401
-		     wqe->wr.send_flags & IB_SEND_SOLICITED);
402
-
403
-send_comp:
404
-	spin_lock_irqsave(&sqp->s_lock, flags);
405
-	ibp->rvp.n_loop_pkts++;
406
-flush_send:
407
-	sqp->s_rnr_retry = sqp->s_rnr_retry_cnt;
408
-	qib_send_complete(sqp, wqe, send_status);
409
-	goto again;
410
-
411
-rnr_nak:
412
-	/* Handle RNR NAK */
413
-	if (qp->ibqp.qp_type == IB_QPT_UC)
414
-		goto send_comp;
415
-	ibp->rvp.n_rnr_naks++;
416
-	/*
417
-	 * Note: we don't need the s_lock held since the BUSY flag
418
-	 * makes this single threaded.
419
-	 */
420
-	if (sqp->s_rnr_retry == 0) {
421
-		send_status = IB_WC_RNR_RETRY_EXC_ERR;
422
-		goto serr;
423
-	}
424
-	if (sqp->s_rnr_retry_cnt < 7)
425
-		sqp->s_rnr_retry--;
426
-	spin_lock_irqsave(&sqp->s_lock, flags);
427
-	if (!(ib_rvt_state_ops[sqp->state] & RVT_PROCESS_RECV_OK))
428
-		goto clr_busy;
429
-	rvt_add_rnr_timer(sqp, qp->r_min_rnr_timer <<
430
-				IB_AETH_CREDIT_SHIFT);
431
-	goto clr_busy;
432
-
433
-op_err:
434
-	send_status = IB_WC_REM_OP_ERR;
435
-	wc.status = IB_WC_LOC_QP_OP_ERR;
436
-	goto err;
437
-
438
-inv_err:
439
-	send_status =
440
-		sqp->ibqp.qp_type == IB_QPT_RC ?
441
-			IB_WC_REM_INV_REQ_ERR :
442
-			IB_WC_SUCCESS;
443
-	wc.status = IB_WC_LOC_QP_OP_ERR;
444
-	goto err;
445
-
446
-acc_err:
447
-	send_status = IB_WC_REM_ACCESS_ERR;
448
-	wc.status = IB_WC_LOC_PROT_ERR;
449
-err:
450
-	/* responder goes to error state */
451
-	rvt_rc_error(qp, wc.status);
452
-
453
-serr:
454
-	spin_lock_irqsave(&sqp->s_lock, flags);
455
-	qib_send_complete(sqp, wqe, send_status);
456
-	if (sqp->ibqp.qp_type == IB_QPT_RC) {
457
-		int lastwqe = rvt_error_qp(sqp, IB_WC_WR_FLUSH_ERR);
458
-
459
-		sqp->s_flags &= ~RVT_S_BUSY;
460
-		spin_unlock_irqrestore(&sqp->s_lock, flags);
461
-		if (lastwqe) {
462
-			struct ib_event ev;
463
-
464
-			ev.device = sqp->ibqp.device;
465
-			ev.element.qp = &sqp->ibqp;
466
-			ev.event = IB_EVENT_QP_LAST_WQE_REACHED;
467
-			sqp->ibqp.event_handler(&ev, sqp->ibqp.qp_context);
468
-		}
469
-		goto done;
470
-	}
471
-clr_busy:
472
-	sqp->s_flags &= ~RVT_S_BUSY;
473
-unlock:
474
-	spin_unlock_irqrestore(&sqp->s_lock, flags);
475
-done:
476
-	rcu_read_unlock();
477
-}
478
-
479
-/**
480174  * qib_make_grh - construct a GRH header
481175  * @ibp: a pointer to the IB port
482176  * @hdr: a pointer to the GRH header being constructed
....@@ -578,7 +272,7 @@
578272 	     qp->ibqp.qp_type == IB_QPT_UC) &&
579273 	    (rdma_ah_get_dlid(&qp->remote_ah_attr) &
580274 	     ~((1 << ppd->lmc) - 1)) == ppd->lid) {
581
-		qib_ruc_loopback(qp);
275
+		rvt_ruc_loopback(qp);
582276 		return;
583277 	}
584278 
....@@ -617,43 +311,4 @@
617311 	} while (make_req(qp, &flags));
618312 
619313 	spin_unlock_irqrestore(&qp->s_lock, flags);
620
-}
621
-
622
-/*
623
- * This should be called with s_lock held.
624
- */
625
-void qib_send_complete(struct rvt_qp *qp, struct rvt_swqe *wqe,
626
-		       enum ib_wc_status status)
627
-{
628
-	u32 old_last, last;
629
-
630
-	if (!(ib_rvt_state_ops[qp->state] & RVT_PROCESS_OR_FLUSH_SEND))
631
-		return;
632
-
633
-	last = qp->s_last;
634
-	old_last = last;
635
-	if (++last >= qp->s_size)
636
-		last = 0;
637
-	qp->s_last = last;
638
-	/* See post_send() */
639
-	barrier();
640
-	rvt_put_swqe(wqe);
641
-	if (qp->ibqp.qp_type == IB_QPT_UD ||
642
-	    qp->ibqp.qp_type == IB_QPT_SMI ||
643
-	    qp->ibqp.qp_type == IB_QPT_GSI)
644
-		atomic_dec(&ibah_to_rvtah(wqe->ud_wr.ah)->refcount);
645
-
646
-	rvt_qp_swqe_complete(qp,
647
-			     wqe,
648
-			     ib_qib_wc_opcode[wqe->wr.opcode],
649
-			     status);
650
-
651
-	if (qp->s_acked == old_last)
652
-		qp->s_acked = last;
653
-	if (qp->s_cur == old_last)
654
-		qp->s_cur = last;
655
-	if (qp->s_tail == old_last)
656
-		qp->s_tail = last;
657
-	if (qp->state == IB_QPS_SQD && last == qp->s_cur)
658
-		qp->s_draining = 0;
659314 }