From: "Michael J. Ruhl" <michael.j.ruhl@intel.com>
Date: Thu, 19 Dec 2019 16:19:28 -0500
Subject: IB/hfi1: List all receive contexts from debugfs
Patch-mainline: v5.6-rc1
Git-commit: 44ec5aa3c6158122412b3018fdea1474edf0898e
References: jsc#SLE-8449

The current debugfs output for receive contexts (rcds), stops after the
kernel receive contexts have been displayed.  This is not enough
information to fully diagnose packet drops.

Display all of the receive contexts.

Augment the output with some more context information.

Limit the ring buffer header output to 5 entries to avoid overextending
the sequential file output.

Fixes: bf808b5039c ("IB/hfi1: Add kernel receive context info to debugfs")
Link: https://lore.kernel.org/r/20191219211928.58387.20737.stgit@awfm-01.aw.intel.com
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Michael J. Ruhl <michael.j.ruhl@intel.com>
Signed-off-by: Kaike Wan <kaike.wan@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Acked-by: Thomas Bogendoerfer <tbogendoerfer@suse.de>
---
 drivers/infiniband/hw/hfi1/debugfs.c |    2 +-
 drivers/infiniband/hw/hfi1/driver.c  |   12 +++++++++---
 2 files changed, 10 insertions(+), 4 deletions(-)

--- a/drivers/infiniband/hw/hfi1/debugfs.c
+++ b/drivers/infiniband/hw/hfi1/debugfs.c
@@ -379,7 +379,7 @@ static void *_rcds_seq_next(struct seq_f
 	struct hfi1_devdata *dd = dd_from_dev(ibd);
 
 	++*pos;
-	if (!dd->rcd || *pos >= dd->n_krcv_queues)
+	if (!dd->rcd || *pos >= dd->num_rcv_contexts)
 		return NULL;
 	return pos;
 }
--- a/drivers/infiniband/hw/hfi1/driver.c
+++ b/drivers/infiniband/hw/hfi1/driver.c
@@ -1726,23 +1726,29 @@ static int process_receive_invalid(struc
 	return RHF_RCV_CONTINUE;
 }
 
+#define HFI1_RCVHDR_DUMP_MAX	5
+
 void seqfile_dump_rcd(struct seq_file *s, struct hfi1_ctxtdata *rcd)
 {
 	struct hfi1_packet packet;
 	struct ps_mdata mdata;
+	int i;
 
-	seq_printf(s, "Rcd %u: RcvHdr cnt %u entsize %u %s head %llu tail %llu\n",
+	seq_printf(s, "Rcd %u: RcvHdr cnt %u entsize %u %s ctrl 0x%08llx status 0x%08llx, head %llu tail %llu  sw head %u\n",
 		   rcd->ctxt, get_hdrq_cnt(rcd), get_hdrqentsize(rcd),
 		   get_dma_rtail_setting(rcd) ?
 		   "dma_rtail" : "nodma_rtail",
+		   read_kctxt_csr(rcd->dd, rcd->ctxt, RCV_CTXT_CTRL),
+		   read_kctxt_csr(rcd->dd, rcd->ctxt, RCV_CTXT_STATUS),
 		   read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_HEAD) &
 		   RCV_HDR_HEAD_HEAD_MASK,
-		   read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_TAIL));
+		   read_uctxt_csr(rcd->dd, rcd->ctxt, RCV_HDR_TAIL),
+		   rcd->head);
 
 	init_packet(rcd, &packet);
 	init_ps_mdata(&mdata, &packet);
 
-	while (1) {
+	for (i = 0; i < HFI1_RCVHDR_DUMP_MAX; i++) {
 		__le32 *rhf_addr = (__le32 *)rcd->rcvhdrq + mdata.ps_head +
 					 rcd->rhf_offset;
 		struct ib_header *hdr;