linux-kernel - [PATCH v2 10/17] ibmvfc: advertise client support for using hardware channels

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Date:   Tue,  1 Dec 2020 18:53:22 -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>,
        Brian King <brking@...ux.vnet.ibm.com>
Subject: [PATCH v2 10/17] ibmvfc: advertise client support for using hardware channels

Previous patches have plumbed the necessary Sub-CRQ interface and
channel negotiation MADs to fully channelized hardware queues.

Advertise client support via NPIV Login capability
IBMVFC_CAN_USE_CHANNELS when the client bits have MQ enabled via
vhost->mq_enabled, or when channels were already in use during a
subsequent NPIV Login. The later is required because channel support is
only renegotiated after a CRQ pair is broken. Simple NPIV Logout/Logins
require the client to continue to advertise the channel capability until
the CRQ pair between the client is broken.

Signed-off-by: Tyrel Datwyler <tyreld@...ux.ibm.com>
Reviewed-by: Brian King <brking@...ux.vnet.ibm.com>
---
 drivers/scsi/ibmvscsi/ibmvfc.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/scsi/ibmvscsi/ibmvfc.c b/drivers/scsi/ibmvscsi/ibmvfc.c
index bfd3340eb0b6..0e6c9e55a221 100644
--- a/drivers/scsi/ibmvscsi/ibmvfc.c
+++ b/drivers/scsi/ibmvscsi/ibmvfc.c
@@ -1282,6 +1282,10 @@ static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
 
 	login_info->max_cmds = cpu_to_be32(max_requests + IBMVFC_NUM_INTERNAL_REQ);
 	login_info->capabilities = cpu_to_be64(IBMVFC_CAN_MIGRATE | IBMVFC_CAN_SEND_VF_WWPN);
+
+	if (vhost->mq_enabled || vhost->using_channels)
+		login_info->capabilities |= cpu_to_be64(IBMVFC_CAN_USE_CHANNELS);
+
 	login_info->async.va = cpu_to_be64(vhost->async_crq.msg_token);
 	login_info->async.len = cpu_to_be32(vhost->async_crq.size * sizeof(*vhost->async_crq.msgs));
 	strncpy(login_info->partition_name, vhost->partition_name, IBMVFC_MAX_NAME);
-- 
2.27.0