scsi: ibmvfc: add FC Class 3 Error Recovery support
The ibmvfc driver currently doesn't support FC Class 3 Error Recovery. However, it is simply a matter of informing the VIOS that the payload expects to use sequence level error recovery via a bit flag in the ibmvfc_cmd structure. This patch adds a module parameter to enable error recovery support at boot time. When enabled the RETRY service parameter bit is set during PRLI, and ibmvfc_cmd->flags includes the IBMVFC_CLASS_3_ERR bit. Signed-off-by: Tyrel Datwyler <tyreld@linux.vnet.ibm.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
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@ -52,6 +52,7 @@ static unsigned int max_requests = IBMVFC_MAX_REQUESTS_DEFAULT;
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static unsigned int disc_threads = IBMVFC_MAX_DISC_THREADS;
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static unsigned int ibmvfc_debug = IBMVFC_DEBUG;
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static unsigned int log_level = IBMVFC_DEFAULT_LOG_LEVEL;
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static unsigned int cls3_error = IBMVFC_CLS3_ERROR;
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static LIST_HEAD(ibmvfc_head);
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static DEFINE_SPINLOCK(ibmvfc_driver_lock);
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static struct scsi_transport_template *ibmvfc_transport_template;
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@ -86,6 +87,9 @@ MODULE_PARM_DESC(debug, "Enable driver debug information. "
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module_param_named(log_level, log_level, uint, 0);
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MODULE_PARM_DESC(log_level, "Set to 0 - 4 for increasing verbosity of device driver. "
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"[Default=" __stringify(IBMVFC_DEFAULT_LOG_LEVEL) "]");
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module_param_named(cls3_error, cls3_error, uint, 0);
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MODULE_PARM_DESC(log_level, "Enable FC Class 3 Error Recovery. "
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"[Default=" __stringify(IBMVFC_CLS3_ERROR) "]");
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static const struct {
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u16 status;
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@ -1335,6 +1339,9 @@ static int ibmvfc_map_sg_data(struct scsi_cmnd *scmd,
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struct srp_direct_buf *data = &vfc_cmd->ioba;
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struct ibmvfc_host *vhost = dev_get_drvdata(dev);
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if (cls3_error)
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vfc_cmd->flags |= cpu_to_be16(IBMVFC_CLASS_3_ERR);
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sg_mapped = scsi_dma_map(scmd);
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if (!sg_mapped) {
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vfc_cmd->flags |= cpu_to_be16(IBMVFC_NO_MEM_DESC);
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@ -3383,6 +3390,9 @@ static void ibmvfc_tgt_send_prli(struct ibmvfc_target *tgt)
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prli->parms.service_parms = cpu_to_be32(IBMVFC_PRLI_INITIATOR_FUNC);
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prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_READ_FCP_XFER_RDY_DISABLED);
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if (cls3_error)
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prli->parms.service_parms |= cpu_to_be32(IBMVFC_PRLI_RETRY);
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ibmvfc_set_tgt_action(tgt, IBMVFC_TGT_ACTION_INIT_WAIT);
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if (ibmvfc_send_event(evt, vhost, default_timeout)) {
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vhost->discovery_threads--;
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@ -54,6 +54,7 @@
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#define IBMVFC_DEV_LOSS_TMO (5 * 60)
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#define IBMVFC_DEFAULT_LOG_LEVEL 2
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#define IBMVFC_MAX_CDB_LEN 16
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#define IBMVFC_CLS3_ERROR 0
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/*
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* Ensure we have resources for ERP and initialization:
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