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[SCSI] ibmvfc: Add flush on halt support

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The virtual I/O server controlling the NPIV adapter associated with
a virtual fibre channel adapter can send a HALT event to the client.
When this occurs, the client can no longer send commands until a RESUME
is received. By adding support for flush on halt, we will get all of
our outstanding commands flushed back before the Virtual I/O server
enters the halt state, eliminating potential command timeouts for
outstanding commands which might occur if we did not support this feature.

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Brian King
2009-05-28 16:17:30 -05:00
committed by James Bottomley
parent 79111d0899
commit 497f9c504f
2 changed files with 42 additions and 5 deletions
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34
drivers/scsi/ibmvscsi/ibmvfc.c
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@@ -110,7 +110,7 @@ static const struct {
{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_DEAD, DID_ERROR, 0, 1, "transport dead" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_CONFIG_ERROR, DID_ERROR, 1, 1, "configuration error" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_NAME_SERVER_FAIL, DID_ERROR, 1, 1, "name server failure" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 0, 0, "link halted" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_LINK_HALTED, DID_REQUEUE, 1, 0, "link halted" },
{ IBMVFC_FABRIC_MAPPED, IBMVFC_XPORT_GENERAL, DID_OK, 1, 0, "general transport error" },
{ IBMVFC_VIOS_FAILURE, IBMVFC_CRQ_FAILURE, DID_REQUEUE, 1, 1, "CRQ failure" },
@@ -1169,8 +1169,9 @@ static void ibmvfc_set_login_info(struct ibmvfc_host *vhost)
login_info->partition_num = vhost->partition_number;
login_info->vfc_frame_version = 1;
login_info->fcp_version = 3;
login_info->flags = IBMVFC_FLUSH_ON_HALT;
if (vhost->client_migrated)
login_info->flags = IBMVFC_CLIENT_MIGRATED;
login_info->flags |= IBMVFC_CLIENT_MIGRATED;
login_info->max_cmds = max_requests + IBMVFC_NUM_INTERNAL_REQ;
login_info->capabilities = IBMVFC_CAN_MIGRATE;
@@ -2185,8 +2186,25 @@ static void ibmvfc_handle_async(struct ibmvfc_async_crq *crq,
" node_name: %llx\n", desc, crq->scsi_id, crq->wwpn, crq->node_name);
switch (crq->event) {
case IBMVFC_AE_LINK_UP:
case IBMVFC_AE_RESUME:
switch (crq->link_state) {
case IBMVFC_AE_LS_LINK_DOWN:
ibmvfc_link_down(vhost, IBMVFC_LINK_DOWN);
break;
case IBMVFC_AE_LS_LINK_DEAD:
ibmvfc_link_down(vhost, IBMVFC_LINK_DEAD);
break;
case IBMVFC_AE_LS_LINK_UP:
case IBMVFC_AE_LS_LINK_BOUNCED:
default:
vhost->events_to_log |= IBMVFC_AE_LINKUP;
vhost->delay_init = 1;
__ibmvfc_reset_host(vhost);
break;
};
break;
case IBMVFC_AE_LINK_UP:
vhost->events_to_log |= IBMVFC_AE_LINKUP;
vhost->delay_init = 1;
__ibmvfc_reset_host(vhost);
@@ -2505,6 +2523,14 @@ static ssize_t ibmvfc_show_host_npiv_version(struct device *dev,
return snprintf(buf, PAGE_SIZE, "%d\n", vhost->login_buf->resp.version);
}
static ssize_t ibmvfc_show_host_capabilities(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct Scsi_Host *shost = class_to_shost(dev);
struct ibmvfc_host *vhost = shost_priv(shost);
return snprintf(buf, PAGE_SIZE, "%llx\n", vhost->login_buf->resp.capabilities);
}
/**
* ibmvfc_show_log_level - Show the adapter's error logging level
* @dev: class device struct
@@ -2554,6 +2580,7 @@ static DEVICE_ATTR(device_name, S_IRUGO, ibmvfc_show_host_device_name, NULL);
static DEVICE_ATTR(port_loc_code, S_IRUGO, ibmvfc_show_host_loc_code, NULL);
static DEVICE_ATTR(drc_name, S_IRUGO, ibmvfc_show_host_drc_name, NULL);
static DEVICE_ATTR(npiv_version, S_IRUGO, ibmvfc_show_host_npiv_version, NULL);
static DEVICE_ATTR(capabilities, S_IRUGO, ibmvfc_show_host_capabilities, NULL);
static DEVICE_ATTR(log_level, S_IRUGO | S_IWUSR,
ibmvfc_show_log_level, ibmvfc_store_log_level);
@@ -2609,6 +2636,7 @@ static struct device_attribute *ibmvfc_attrs[] = {
&dev_attr_port_loc_code,
&dev_attr_drc_name,
&dev_attr_npiv_version,
&dev_attr_capabilities,
&dev_attr_log_level,
NULL
};