linux-kernel - [PATCH 13/13] ibmvfc: register Sub-CRQ handles with VIOS during channel setup

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Message-Id: <20201126014824.123831-14-tyreld@linux.ibm.com>
Date:   Wed, 25 Nov 2020 19:48:24 -0600
From:   Tyrel Datwyler <tyreld@...ux.ibm.com>
To:     james.bottomley@...senpartnership.com
Cc:     martin.petersen@...cle.com, linux-scsi@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
        brking@...ux.ibm.com, Tyrel Datwyler <tyreld@...ux.ibm.com>
Subject: [PATCH 13/13] ibmvfc: register Sub-CRQ handles with VIOS during channel setup

If the ibmvfc client adapter requests channels it must submit a number
of Sub-CRQ handles matching the number of channels being requested. The
VIOS in its response will overwrite the actual number of channel
resources allocated which may be less than what was requested. The
client then must store the VIOS Sub-CRQ handle for each queue. This VIOS
handle is needed as a parameter with  h_send_sub_crq().

Signed-off-by: Tyrel Datwyler <tyreld@...ux.ibm.com>
---
 drivers/scsi/ibmvscsi/ibmvfc.c | 32 +++++++++++++++++++++++++++++++-
 1 file changed, 31 insertions(+), 1 deletion(-)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index 897e3236534d..6bb1028bbe44 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -4494,15 +4494,35 @@ static void ibmvfc_discover_targets(struct ibmvfc_host *vhost)
 static void ibmvfc_channel_setup_done(struct ibmvfc_event *evt)
 {
 	struct ibmvfc_host *vhost = evt->vhost;
+	struct ibmvfc_channel_setup *setup = vhost->channel_setup_buf;
+	struct ibmvfc_scsi_channels *scrqs = &vhost->scsi_scrqs;
 	u32 mad_status = be16_to_cpu(evt->xfer_iu->channel_setup.common.status);
 	int level = IBMVFC_DEFAULT_LOG_LEVEL;
+	int flags, active_queues, i;
 
 	ibmvfc_free_event(evt);
 
 	switch (mad_status) {
 	case IBMVFC_MAD_SUCCESS:
 		ibmvfc_dbg(vhost, "Channel Setup succeded\n");
+		flags = be32_to_cpu(setup->flags);
 		vhost->do_enquiry = 0;
+		active_queues = be32_to_cpu(setup->num_scsi_subq_channels);
+		scrqs->active_queues = active_queues;
+
+		if (flags & IBMVFC_CHANNELS_CANCELED) {
+			ibmvfc_dbg(vhost, "Channels Canceled\n");
+			vhost->using_channels = 0;
+		} else {
+			if (active_queues)
+				vhost->using_channels = 1;
+			for (i = 0; i < active_queues; i++)
+				scrqs->scrqs[i].vios_cookie =
+					be64_to_cpu(setup->channel_handles[i]);
+
+			ibmvfc_dbg(vhost, "Using %u channels\n",
+				   vhost->scsi_scrqs.active_queues);
+		}
 		break;
 	case IBMVFC_MAD_FAILED:
 		level += ibmvfc_retry_host_init(vhost);
@@ -4526,9 +4546,19 @@ static void ibmvfc_channel_setup(struct ibmvfc_host *vhost)
 	struct ibmvfc_channel_setup_mad *mad;
 	struct ibmvfc_channel_setup *setup_buf = vhost->channel_setup_buf;
 	struct ibmvfc_event *evt = ibmvfc_get_event(vhost);
+	struct ibmvfc_scsi_channels *scrqs = &vhost->scsi_scrqs;
+	unsigned int num_channels =
+		min(vhost->client_scsi_channels, vhost->max_vios_scsi_channels);
+	int i;
 
 	memset(setup_buf, 0, sizeof(*setup_buf));
-	setup_buf->flags = cpu_to_be32(IBMVFC_CANCEL_CHANNELS);
+	if (num_channels == 0)
+		setup_buf->flags = cpu_to_be32(IBMVFC_CANCEL_CHANNELS);
+	else {
+		setup_buf->num_scsi_subq_channels = cpu_to_be32(num_channels);
+		for (i = 0; i < num_channels; i++)
+			setup_buf->channel_handles[i] = cpu_to_be64(scrqs->scrqs[i].cookie);
+	}
 
 	ibmvfc_init_event(evt, ibmvfc_channel_setup_done, IBMVFC_MAD_FORMAT);
 	mad = &evt->iu.channel_setup;
-- 
2.27.0