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authorRobert Jennings <rcj@linux.vnet.ibm.com>2009-06-08 16:19:07 -0500
committerJames Bottomley <James.Bottomley@HansenPartnership.com>2009-06-08 18:05:20 -0500
commitc1988e3123751fd425fbae99d5c1776608e965a9 (patch)
tree01ebad88b7799665097a96b4b8f0da447c0e4ee2
parent3507e13fcba6b97501891a410ec8ef9f1f188620 (diff)
downloadlinux-c1988e3123751fd425fbae99d5c1776608e965a9.tar.bz2
[SCSI] ibmvscsi: Enable fast fail feature
A new mode of error reporting, fast fail, has been added to the VIOS which allows failover to happen more quickly. If this new fast fail mode is enabled on the VIOS and the vSCSI client supports the mode, the VIOS will not return MEDIUM error on path failures, but rather return VIOSRP_ADAPTER_FAIL in the crq response, which ibmvscsi will translate to DID_ERROR. This new mode can be enabled for single path configurations as well, so it is the new default error reporting mode. A module parameter is provided to disable this new behavior on the off chance it causes a problem on some old VIOS version. Signed-off-by: Brian King <brking@linux.vnet.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
-rw-r--r--drivers/scsi/ibmvscsi/ibmvscsi.c59
-rw-r--r--drivers/scsi/ibmvscsi/viosrp.h14
2 files changed, 71 insertions, 2 deletions
diff --git a/drivers/scsi/ibmvscsi/ibmvscsi.c b/drivers/scsi/ibmvscsi/ibmvscsi.c
index 2ed46b8efedf..822fbc32a2ae 100644
--- a/drivers/scsi/ibmvscsi/ibmvscsi.c
+++ b/drivers/scsi/ibmvscsi/ibmvscsi.c
@@ -94,6 +94,7 @@ static int abort_timeout = 60;
static int reset_timeout = 60;
static int max_requests = IBMVSCSI_MAX_REQUESTS_DEFAULT;
static int max_events = IBMVSCSI_MAX_REQUESTS_DEFAULT + 2;
+static int fast_fail = 1;
static struct scsi_transport_template *ibmvscsi_transport_template;
@@ -114,6 +115,8 @@ module_param_named(init_timeout, init_timeout, int, S_IRUGO | S_IWUSR);
MODULE_PARM_DESC(init_timeout, "Initialization timeout in seconds");
module_param_named(max_requests, max_requests, int, S_IRUGO);
MODULE_PARM_DESC(max_requests, "Maximum requests for this adapter");
+module_param_named(fast_fail, fast_fail, int, S_IRUGO | S_IWUSR);
+MODULE_PARM_DESC(fast_fail, "Enable fast fail. [Default=1]");
/* ------------------------------------------------------------
* Routines for the event pool and event structs
@@ -863,6 +866,60 @@ static int send_srp_login(struct ibmvscsi_host_data *hostdata)
};
/**
+ * fast_fail_rsp: - Handle response to MAD enable fast fail
+ * @evt_struct: srp_event_struct with the response
+ *
+ * Used as a "done" callback by when sending enable fast fail. Gets called
+ * by ibmvscsi_handle_crq()
+ */
+static void fast_fail_rsp(struct srp_event_struct *evt_struct)
+{
+ struct ibmvscsi_host_data *hostdata = evt_struct->hostdata;
+ u8 status = evt_struct->xfer_iu->mad.fast_fail.common.status;
+
+ if (status == VIOSRP_MAD_NOT_SUPPORTED)
+ dev_err(hostdata->dev, "fast_fail not supported in server\n");
+ else if (status == VIOSRP_MAD_FAILED)
+ dev_err(hostdata->dev, "fast_fail request failed\n");
+ else if (status != VIOSRP_MAD_SUCCESS)
+ dev_err(hostdata->dev, "error 0x%X enabling fast_fail\n", status);
+
+ send_srp_login(hostdata);
+}
+
+/**
+ * init_host - Start host initialization
+ * @hostdata: ibmvscsi_host_data of host
+ *
+ * Returns zero if successful.
+ */
+static int enable_fast_fail(struct ibmvscsi_host_data *hostdata)
+{
+ int rc;
+ unsigned long flags;
+ struct viosrp_fast_fail *fast_fail_mad;
+ struct srp_event_struct *evt_struct;
+
+ if (!fast_fail)
+ return send_srp_login(hostdata);
+
+ evt_struct = get_event_struct(&hostdata->pool);
+ BUG_ON(!evt_struct);
+
+ init_event_struct(evt_struct, fast_fail_rsp, VIOSRP_MAD_FORMAT, info_timeout);
+
+ fast_fail_mad = &evt_struct->iu.mad.fast_fail;
+ memset(fast_fail_mad, 0, sizeof(*fast_fail_mad));
+ fast_fail_mad->common.type = VIOSRP_ENABLE_FAST_FAIL;
+ fast_fail_mad->common.length = sizeof(*fast_fail_mad);
+
+ spin_lock_irqsave(hostdata->host->host_lock, flags);
+ rc = ibmvscsi_send_srp_event(evt_struct, hostdata, info_timeout * 2);
+ spin_unlock_irqrestore(hostdata->host->host_lock, flags);
+ return rc;
+}
+
+/**
* adapter_info_rsp: - Handle response to MAD adapter info request
* @evt_struct: srp_event_struct with the response
*
@@ -903,7 +960,7 @@ static void adapter_info_rsp(struct srp_event_struct *evt_struct)
}
}
- send_srp_login(hostdata);
+ enable_fast_fail(hostdata);
}
/**
diff --git a/drivers/scsi/ibmvscsi/viosrp.h b/drivers/scsi/ibmvscsi/viosrp.h
index 204604501ad8..f5a9c26d1da8 100644
--- a/drivers/scsi/ibmvscsi/viosrp.h
+++ b/drivers/scsi/ibmvscsi/viosrp.h
@@ -86,7 +86,14 @@ enum viosrp_mad_types {
VIOSRP_EMPTY_IU_TYPE = 0x01,
VIOSRP_ERROR_LOG_TYPE = 0x02,
VIOSRP_ADAPTER_INFO_TYPE = 0x03,
- VIOSRP_HOST_CONFIG_TYPE = 0x04
+ VIOSRP_HOST_CONFIG_TYPE = 0x04,
+ VIOSRP_ENABLE_FAST_FAIL = 0x08,
+};
+
+enum viosrp_mad_status {
+ VIOSRP_MAD_SUCCESS = 0x00,
+ VIOSRP_MAD_NOT_SUPPORTED = 0xF1,
+ VIOSRP_MAD_FAILED = 0xF7,
};
/*
@@ -127,11 +134,16 @@ struct viosrp_host_config {
u64 buffer;
};
+struct viosrp_fast_fail {
+ struct mad_common common;
+};
+
union mad_iu {
struct viosrp_empty_iu empty_iu;
struct viosrp_error_log error_log;
struct viosrp_adapter_info adapter_info;
struct viosrp_host_config host_config;
+ struct viosrp_fast_fail fast_fail;
};
union viosrp_iu {