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scsi: ibmvfc: Register Sub-CRQ handles with VIOS during channel setup

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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().

Link: https://lore.kernel.org/r/20210114203148.246656-17-tyreld@linux.ibm.com
Reviewed-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Tyrel Datwyler <tyreld@linux.ibm.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Tyrel Datwyler 2021-01-14 14:31:43 -06:00 • committed by Martin K. Petersen
parent 31750fbd7b
commit b88a5d9b7f
1 changed files with 31 additions and 1 deletions
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32
drivers/scsi/ibmvscsi/ibmvfc.c
View file

@ -4627,15 +4627,35 @@ 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);
@ -4659,9 +4679,19 @@ 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->crq);
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;