[PATCH v3 10/18] ibmvfc: advertise client support for using hardware channels

Tyrel Datwyler
2020-12-03T02:09:41Z

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@linux.ibm.com>
Reviewed-by: Brian King <brking@linux.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 d584a4ce0682..0eb91ac86d96 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