[rdma-core v2 5/9] libbnxt_re: Allow apps to poll for flushed completions

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This patch adds support for reporting flush completions.
following is the overview of the algorithm used.

Step-1: Poll a completion from h/w CQ.
Step-2: check the status, if it is error goto step3 else report
        completion to user based on the con_idx reported.
Step-3: Report the completion with actual error to consumer, and
        without bothering about the con_idx reported in the
        completion do following:
        3a. Add this QP to the CQ flush list if it was not there
            already. If this is req-error, add the QP to send-flush
            list, else add it to recv-flush-list.
        3b. Change QP-soft-state to ERROR if it was not in error
            already.

Step-4: If next CQE is TERM CQE, extract this CQE. make sure this CQE
        is not reported to the consumer. Do the following steps as
        further processing:
        4a. Add this QP to both send-flush-list and recv-flush-list
            if QP is absent from any of the flush lists.
        4b. Change QP-soft-state to ERROR if it was not in error
            already.
Step5: Continue polling from both h/w CQ and flush-lists until
       all the queues are empty.

The QP is removed from the flush list during destroy-qp.

Further, it adds network to host format conversion on
the received immediate data.

This patch also takes care of Hardware specific requirement
to skip reporting h/w flush error CQEs to consumer but ring
the CQ-DB for them.

v1->v2
 -- Used ccan/list.h instead.

Signed-off-by: Sriharsha Basavapatna <sriharsha.basavapatna@xxxxxxxxxxxx>
Signed-off-by: Somnath Kotur <somnath.kotur@xxxxxxxxxxxx>
Signed-off-by: Selvin Xavier <selvin.xavier@xxxxxxxxxxxx>
Signed-off-by: Devesh Sharma <devesh.sharma@xxxxxxxxxxxx>
---
 providers/bnxt_re/flush.h  |  85 ++++++++++++++++
 providers/bnxt_re/main.c   |   5 +
 providers/bnxt_re/main.h   |   6 ++
 providers/bnxt_re/memory.h |   5 +
 providers/bnxt_re/verbs.c  | 243 ++++++++++++++++++++++++++++++++++++++++-----
 5 files changed, 320 insertions(+), 24 deletions(-)
 create mode 100644 providers/bnxt_re/flush.h

diff --git a/providers/bnxt_re/flush.h b/providers/bnxt_re/flush.h
new file mode 100644
index 0000000..a39ea71
--- /dev/null
+++ b/providers/bnxt_re/flush.h
@@ -0,0 +1,85 @@
+/*
+ * Broadcom NetXtreme-E User Space RoCE driver
+ *
+ * Copyright (c) 2015-2017, Broadcom. All rights reserved.  The term
+ * Broadcom refers to Broadcom Limited and/or its subsidiaries.
+ *
+ * This software is available to you under a choice of one of two
+ * licenses.  You may choose to be licensed under the terms of the GNU
+ * General Public License (GPL) Version 2, available from the file
+ * COPYING in the main directory of this source tree, or the
+ * BSD license below:
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in
+ *    the documentation and/or other materials provided with the
+ *    distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR
+ * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
+ * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
+ * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
+ * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * Description: A few wrappers for flush queue management
+ */
+
+#ifndef __FLUSH_H__
+#define __FLUSH_H__
+
+#include <ccan/list.h>
+
+struct bnxt_re_fque_node {
+	uint8_t valid;
+	struct list_node list;
+};
+
+static inline void fque_init_node(struct bnxt_re_fque_node *node)
+{
+	list_node_init(&node->list);
+	node->valid = false;
+}
+
+static inline void fque_add_node_tail(struct list_head *head,
+				      struct bnxt_re_fque_node *new)
+{
+	list_add_tail(head, &new->list);
+	new->valid = true;
+}
+
+static inline void fque_del_node(struct bnxt_re_fque_node *entry)
+{
+	entry->valid = false;
+	list_del(&entry->list);
+}
+
+static inline uint8_t _fque_node_valid(struct bnxt_re_fque_node *node)
+{
+	return node->valid;
+}
+
+static inline void bnxt_re_fque_add_node(struct list_head *head,
+					 struct bnxt_re_fque_node *node)
+{
+	if (!_fque_node_valid(node))
+		fque_add_node_tail(head, node);
+}
+
+static inline void bnxt_re_fque_del_node(struct bnxt_re_fque_node *node)
+{
+	if (_fque_node_valid(node))
+		fque_del_node(node);
+}
+#endif	/* __FLUSH_H__ */
diff --git a/providers/bnxt_re/main.c b/providers/bnxt_re/main.c
index 360c57f..e58c953 100644
--- a/providers/bnxt_re/main.c
+++ b/providers/bnxt_re/main.c
@@ -128,6 +128,7 @@ static int bnxt_re_init_context(struct verbs_device *vdev,
 	dev->pg_size = resp.pg_size;
 	dev->cqe_size = resp.cqe_size;
 	dev->max_cq_depth = resp.max_cqd;
+	pthread_spin_init(&cntx->fqlock, PTHREAD_PROCESS_PRIVATE);
 	ibvctx->ops = bnxt_re_cntx_ops;
 
 	return 0;
@@ -136,7 +137,11 @@ static int bnxt_re_init_context(struct verbs_device *vdev,
 static void bnxt_re_uninit_context(struct verbs_device *vdev,
 				   struct ibv_context *ibvctx)
 {
+	struct bnxt_re_context *cntx;
+
+	cntx = to_bnxt_re_context(ibvctx);
 	/* Unmap if anything device specific was mapped in init_context. */
+	pthread_spin_destroy(&cntx->fqlock);
 }
 
 static struct verbs_device *bnxt_re_driver_init(const char *uverbs_sys_path,
diff --git a/providers/bnxt_re/main.h b/providers/bnxt_re/main.h
index bfe7089..d324ef6 100644
--- a/providers/bnxt_re/main.h
+++ b/providers/bnxt_re/main.h
@@ -50,6 +50,7 @@
 
 #include "bnxt_re-abi.h"
 #include "memory.h"
+#include "flush.h"
 
 #define DEV	"bnxtre : "
 
@@ -69,6 +70,8 @@ struct bnxt_re_cq {
 	uint32_t cqid;
 	struct bnxt_re_queue cqq;
 	struct bnxt_re_dpi *udpi;
+	struct list_head sfhead;
+	struct list_head rfhead;
 	uint32_t cqe_size;
 	uint8_t  phase;
 };
@@ -104,6 +107,8 @@ struct bnxt_re_qp {
 	struct bnxt_re_cq *rcq;
 	struct bnxt_re_dpi *udpi;
 	struct bnxt_re_qpcap cap;
+	struct bnxt_re_fque_node snode;
+	struct bnxt_re_fque_node rnode;
 	uint32_t qpid;
 	uint32_t tbl_indx;
 	uint32_t sq_psn;
@@ -133,6 +138,7 @@ struct bnxt_re_context {
 	uint32_t max_qp;
 	uint32_t max_srq;
 	struct bnxt_re_dpi udpi;
+	pthread_spinlock_t fqlock;
 };
 
 /* DB ring functions used internally*/
diff --git a/providers/bnxt_re/memory.h b/providers/bnxt_re/memory.h
index f812eb8..debb31a 100644
--- a/providers/bnxt_re/memory.h
+++ b/providers/bnxt_re/memory.h
@@ -89,6 +89,11 @@ static inline uint32_t bnxt_re_is_que_full(struct bnxt_re_queue *que)
 	return (((que->tail + 1) & (que->depth - 1)) == que->head);
 }
 
+static inline uint32_t bnxt_re_is_que_empty(struct bnxt_re_queue *que)
+{
+	return que->tail == que->head;
+}
+
 static inline uint32_t bnxt_re_incr(uint32_t val, uint32_t max)
 {
 	return (++val & (max - 1));
diff --git a/providers/bnxt_re/verbs.c b/providers/bnxt_re/verbs.c
index f2f1ce8..2273e82 100644
--- a/providers/bnxt_re/verbs.c
+++ b/providers/bnxt_re/verbs.c
@@ -202,6 +202,9 @@ struct ibv_cq *bnxt_re_create_cq(struct ibv_context *ibvctx, int ncqe,
 	cq->cqq.tail = resp.tail;
 	cq->udpi = &cntx->udpi;
 
+	list_head_init(&cq->sfhead);
+	list_head_init(&cq->rfhead);
+
 	return &cq->ibvcq;
 cmdfail:
 	bnxt_re_free_aligned(&cq->cqq);
@@ -230,6 +233,47 @@ int bnxt_re_destroy_cq(struct ibv_cq *ibvcq)
 	return 0;
 }
 
+static uint8_t bnxt_re_poll_err_scqe(struct bnxt_re_qp *qp,
+				     struct ibv_wc *ibvwc,
+				     struct bnxt_re_bcqe *hdr,
+				     struct bnxt_re_req_cqe *scqe, int *cnt)
+{
+	struct bnxt_re_queue *sq = qp->sqq;
+	struct bnxt_re_context *cntx;
+	struct bnxt_re_wrid *swrid;
+	struct bnxt_re_psns *spsn;
+	struct bnxt_re_cq *scq;
+	uint32_t head = sq->head;
+	uint8_t status;
+
+	scq = to_bnxt_re_cq(qp->ibvqp.send_cq);
+	cntx = to_bnxt_re_context(scq->ibvcq.context);
+	swrid = &qp->swrid[head];
+	spsn = swrid->psns;
+
+	*cnt = 1;
+	status = (hdr->flg_st_typ_ph >> BNXT_RE_BCQE_STATUS_SHIFT) &
+		  BNXT_RE_BCQE_STATUS_MASK;
+	ibvwc->status = bnxt_re_to_ibv_wc_status(status, true);
+	ibvwc->wc_flags = 0;
+	ibvwc->wr_id = swrid->wrid;
+	ibvwc->qp_num = qp->qpid;
+	ibvwc->opcode = (le32toh(spsn->opc_spsn) >>
+			BNXT_RE_PSNS_OPCD_SHIFT) &
+			BNXT_RE_PSNS_OPCD_MASK;
+	ibvwc->byte_len = 0;
+
+	bnxt_re_incr_head(qp->sqq);
+
+	if (qp->qpst != IBV_QPS_ERR)
+		qp->qpst = IBV_QPS_ERR;
+	pthread_spin_lock(&cntx->fqlock);
+	bnxt_re_fque_add_node(&scq->sfhead, &qp->snode);
+	pthread_spin_unlock(&cntx->fqlock);
+
+	return false;
+}
+
 static uint8_t bnxt_re_poll_success_scqe(struct bnxt_re_qp *qp,
 					 struct ibv_wc *ibvwc,
 					 struct bnxt_re_bcqe *hdr,
@@ -284,21 +328,53 @@ static uint8_t bnxt_re_poll_scqe(struct bnxt_re_qp *qp, struct ibv_wc *ibvwc,
 
 	status = (hdr->flg_st_typ_ph >> BNXT_RE_BCQE_STATUS_SHIFT) &
 		  BNXT_RE_BCQE_STATUS_MASK;
-	if (status == BNXT_RE_REQ_ST_OK) {
+	if (status == BNXT_RE_REQ_ST_OK)
 		pcqe = bnxt_re_poll_success_scqe(qp, ibvwc, hdr, scqe, cnt);
-	} else {
-		/* TODO: Handle error completion properly. */
-		fprintf(stderr, "%s(): swc with error, vendor status = %d\n",
-			__func__, status);
-		*cnt = 1;
-		ibvwc->status = bnxt_re_to_ibv_wc_status(status, true);
-		ibvwc->wr_id = qp->swrid[qp->sqq->head].wrid;
-		bnxt_re_incr_head(qp->sqq);
-	}
+	else
+		pcqe = bnxt_re_poll_err_scqe(qp, ibvwc, hdr, scqe, cnt);
 
 	return pcqe;
 }
 
+static int bnxt_re_poll_err_rcqe(struct bnxt_re_qp *qp,
+				 struct ibv_wc *ibvwc,
+				 struct bnxt_re_bcqe *hdr,
+				 struct bnxt_re_rc_cqe *rcqe)
+{
+	struct bnxt_re_queue *rq = qp->rqq;
+	struct bnxt_re_wrid *rwrid;
+	struct bnxt_re_cq *rcq;
+	struct bnxt_re_context *cntx;
+	uint32_t head = rq->head;
+	uint8_t status;
+
+	rcq = to_bnxt_re_cq(qp->ibvqp.recv_cq);
+	cntx = to_bnxt_re_context(rcq->ibvcq.context);
+
+	rwrid = &qp->rwrid[head];
+	status = (hdr->flg_st_typ_ph >> BNXT_RE_BCQE_STATUS_SHIFT) &
+		  BNXT_RE_BCQE_STATUS_MASK;
+	/* skip h/w flush errors */
+	if (status == BNXT_RE_RSP_ST_HW_FLUSH)
+		return 0;
+	ibvwc->status = bnxt_re_to_ibv_wc_status(status, false);
+	/* TODO: Add SRQ Processing here */
+	if (qp->rqq) {
+		ibvwc->wr_id = rwrid->wrid;
+		ibvwc->qp_num = qp->qpid;
+		ibvwc->opcode = IBV_WC_RECV;
+		ibvwc->byte_len = 0;
+		bnxt_re_incr_head(qp->rqq);
+		if (qp->qpst != IBV_QPS_ERR)
+			qp->qpst = IBV_QPS_ERR;
+		pthread_spin_lock(&cntx->fqlock);
+		bnxt_re_fque_add_node(&rcq->rfhead, &qp->rnode);
+		pthread_spin_unlock(&cntx->fqlock);
+	}
+
+	return 1;
+}
+
 static void bnxt_re_poll_success_rcqe(struct bnxt_re_qp *qp,
 				      struct ibv_wc *ibvwc,
 				      struct bnxt_re_bcqe *hdr,
@@ -346,18 +422,37 @@ static uint8_t bnxt_re_poll_rcqe(struct bnxt_re_qp *qp, struct ibv_wc *ibvwc,
 
 	status = (hdr->flg_st_typ_ph >> BNXT_RE_BCQE_STATUS_SHIFT) &
 		  BNXT_RE_BCQE_STATUS_MASK;
-	if (status == BNXT_RE_RSP_ST_OK) {
+	*cnt = 1;
+	if (status == BNXT_RE_RSP_ST_OK)
 		bnxt_re_poll_success_rcqe(qp, ibvwc, hdr, rcqe);
-		*cnt = 1;
-	} else {
-		/* TODO: Process error completions properly.*/
-		*cnt = 1;
-		ibvwc->status = bnxt_re_to_ibv_wc_status(status, false);
-		if (qp->rqq) {
-			ibvwc->wr_id = qp->rwrid[qp->rqq->head].wrid;
-			bnxt_re_incr_head(qp->rqq);
-		}
-	}
+	else
+		*cnt = bnxt_re_poll_err_rcqe(qp, ibvwc, hdr, rcqe);
+
+	return pcqe;
+}
+
+static uint8_t bnxt_re_poll_term_cqe(struct bnxt_re_qp *qp,
+				     struct ibv_wc *ibvwc, void *cqe, int *cnt)
+{
+	struct bnxt_re_context *cntx;
+	struct bnxt_re_cq *scq, *rcq;
+	uint8_t pcqe = false;
+
+	scq = to_bnxt_re_cq(qp->ibvqp.send_cq);
+	rcq = to_bnxt_re_cq(qp->ibvqp.recv_cq);
+	cntx = to_bnxt_re_context(scq->ibvcq.context);
+	/* For now just add the QP to flush list without
+	 * considering the index reported in the CQE.
+	 * Continue reporting flush completions until the
+	 * SQ and RQ are empty.
+	 */
+	*cnt = 0;
+	if (qp->qpst != IBV_QPS_ERR)
+		qp->qpst = IBV_QPS_ERR;
+	pthread_spin_lock(&cntx->fqlock);
+	bnxt_re_fque_add_node(&rcq->rfhead, &qp->rnode);
+	bnxt_re_fque_add_node(&scq->sfhead, &qp->snode);
+	pthread_spin_unlock(&cntx->fqlock);
 
 	return pcqe;
 }
@@ -410,6 +505,12 @@ static int bnxt_re_poll_one(struct bnxt_re_cq *cq, int nwc, struct ibv_wc *wc)
 		case BNXT_RE_WC_TYPE_RECV_RAW:
 			break;
 		case BNXT_RE_WC_TYPE_TERM:
+			scqe = cqe;
+			qp_handle = (uint64_t *)&scqe->qp_handle;
+			qp = (struct bnxt_re_qp *)scqe->qp_handle;
+			if (!qp)
+				break;
+			pcqe = bnxt_re_poll_term_cqe(qp, wc, cqe, &cnt);
 			break;
 		case BNXT_RE_WC_TYPE_COFF:
 			break;
@@ -442,22 +543,107 @@ bail:
 	return dqed;
 }
 
+static int bnxt_re_poll_flush_wcs(struct bnxt_re_queue *que,
+				  struct bnxt_re_wrid *wridp,
+				  struct ibv_wc *ibvwc, uint32_t qpid,
+				  int nwc)
+{
+	struct bnxt_re_wrid *wrid;
+	struct bnxt_re_psns *psns;
+	uint32_t cnt = 0, head;
+	uint8_t opcode = IBV_WC_RECV;
+
+	while (nwc) {
+		if (bnxt_re_is_que_empty(que))
+			break;
+		head = que->head;
+		wrid = &wridp[head];
+		if (wrid->psns) {
+			psns = wrid->psns;
+			opcode = (psns->opc_spsn >> BNXT_RE_PSNS_OPCD_SHIFT) &
+				  BNXT_RE_PSNS_OPCD_MASK;
+		}
+
+		ibvwc->status = IBV_WC_WR_FLUSH_ERR;
+		ibvwc->opcode = opcode;
+		ibvwc->wr_id = wrid->wrid;
+		ibvwc->qp_num = qpid;
+		ibvwc->byte_len = 0;
+		ibvwc->wc_flags = 0;
+
+		bnxt_re_incr_head(que);
+		nwc--;
+		cnt++;
+		ibvwc++;
+	}
+
+	return cnt;
+}
+
+static int bnxt_re_poll_flush_lists(struct bnxt_re_cq *cq, uint32_t nwc,
+				    struct ibv_wc *ibvwc)
+{
+	struct bnxt_re_fque_node *cur, *tmp;
+	struct bnxt_re_qp *qp;
+	struct bnxt_re_queue *que;
+	int dqed = 0, left;
+
+	/* Check if flush Qs are empty */
+	if (list_empty(&cq->sfhead) && list_empty(&cq->rfhead))
+		return 0;
+
+	if (!list_empty(&cq->sfhead)) {
+		list_for_each_safe(&cq->sfhead, cur, tmp, list) {
+			qp = container_of(cur, struct bnxt_re_qp, snode);
+			que = qp->sqq;
+			if (bnxt_re_is_que_empty(que))
+				continue;
+			dqed = bnxt_re_poll_flush_wcs(que, qp->swrid, ibvwc,
+						      qp->qpid, nwc);
+		}
+	}
+
+	left = nwc - dqed;
+	if (!left)
+		return dqed;
+
+	if (!list_empty(&cq->rfhead)) {
+		list_for_each_safe(&cq->rfhead, cur, tmp, list) {
+			qp = container_of(cur, struct bnxt_re_qp, rnode);
+			que = qp->rqq;
+			if (!que || bnxt_re_is_que_empty(que))
+				continue;
+			dqed += bnxt_re_poll_flush_wcs(que, qp->rwrid,
+						       ibvwc + dqed, qp->qpid,
+						       left);
+		}
+	}
+
+	return dqed;
+}
+
 int bnxt_re_poll_cq(struct ibv_cq *ibvcq, int nwc, struct ibv_wc *wc)
 {
 	struct bnxt_re_cq *cq = to_bnxt_re_cq(ibvcq);
-	int dqed;
+	struct bnxt_re_context *cntx = to_bnxt_re_context(ibvcq->context);
+	int dqed, left = 0;
 
 	pthread_spin_lock(&cq->cqq.qlock);
 	dqed = bnxt_re_poll_one(cq, nwc, wc);
 	pthread_spin_unlock(&cq->cqq.qlock);
-
-	/* TODO: Flush Management*/
+	/* Check if anything is there to flush. */
+	pthread_spin_lock(&cntx->fqlock);
+	left = nwc - dqed;
+	if (left)
+		dqed += bnxt_re_poll_flush_lists(cq, left, (wc + dqed));
+	pthread_spin_unlock(&cntx->fqlock);
 
 	return dqed;
 }
 
 static void bnxt_re_cleanup_cq(struct bnxt_re_qp *qp, struct bnxt_re_cq *cq)
 {
+	struct bnxt_re_context *cntx;
 	struct bnxt_re_queue *que = &cq->cqq;
 	struct bnxt_re_bcqe *hdr;
 	struct bnxt_re_req_cqe *scqe;
@@ -465,6 +651,8 @@ static void bnxt_re_cleanup_cq(struct bnxt_re_qp *qp, struct bnxt_re_cq *cq)
 	void *cqe;
 	int indx, type;
 
+	cntx = to_bnxt_re_context(cq->ibvcq.context);
+
 	pthread_spin_lock(&que->qlock);
 	for (indx = 0; indx < que->depth; indx++) {
 		cqe = que->va + indx * bnxt_re_get_cqe_sz();
@@ -487,6 +675,11 @@ static void bnxt_re_cleanup_cq(struct bnxt_re_qp *qp, struct bnxt_re_cq *cq)
 
 	}
 	pthread_spin_unlock(&que->qlock);
+
+	pthread_spin_lock(&cntx->fqlock);
+	bnxt_re_fque_del_node(&qp->snode);
+	bnxt_re_fque_del_node(&qp->rnode);
+	pthread_spin_unlock(&cntx->fqlock);
 }
 
 void bnxt_re_cq_event(struct ibv_cq *ibvcq)
@@ -679,6 +872,8 @@ struct ibv_qp *bnxt_re_create_qp(struct ibv_pd *ibvpd,
 	cap->max_rsge = attr->cap.max_recv_sge;
 	cap->max_inline = attr->cap.max_inline_data;
 	cap->sqsig = attr->sq_sig_all;
+	fque_init_node(&qp->snode);
+	fque_init_node(&qp->rnode);
 
 	return &qp->ibvqp;
 failcmd:
-- 
1.8.3.1

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