scsi: qedf: Add bus_reset No-op.

We need to add a bus reset no-op as without it some of the LUNs attached to a
vport may go offline when the error handler escalates to host reset due to not
having a bus reset handler in the driver. What happens is we escalate to host
reset which does a soft link down/link up to reset the adapter. However with
multiple vports attached it's been observed that if the vports do log back into
the target within 5 seconds, the SCSI layer offlines the devices most likely
due to a TUR timing out to verify that the device is online. Adding a bus
reset handler will cause the TUR to be sent after the bus reset handler where
the devices will still be online if the bus reset is initiated by sg_reset
(which is the case in the test that was failing). The bus reset will succeed
and not needlessly bring the device offline/online.

Signed-off-by: Chad Dupuis <chad.dupuis@cavium.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

diff --git a/drivers/scsi/qedf/qedf_main.c b/drivers/scsi/qedf/qedf_main.c
index 6813b9b..ef0dc56 100644 (file)
--- a/drivers/scsi/qedf/qedf_main.c
+++ b/drivers/scsi/qedf/qedf_main.c
@@ -628,6 +628,16 @@ static int qedf_eh_device_reset(struct scsi_cmnd *sc_cmd)
        return qedf_initiate_tmf(sc_cmd, FCP_TMF_LUN_RESET);
 }
 
+static int qedf_eh_bus_reset(struct scsi_cmnd *sc_cmd)
+{
+       QEDF_ERR(NULL, "BUS RESET Issued...\n");
+       /*
+        * Essentially a no-op but return SUCCESS to prevent
+        * unnecessary escalation to the host reset handler.
+        */
+       return SUCCESS;
+}
+
 void qedf_wait_for_upload(struct qedf_ctx *qedf)
 {
        while (1) {
@@ -705,6 +715,7 @@ static struct scsi_host_template qedf_host_template = {
        .eh_abort_handler       = qedf_eh_abort,
        .eh_device_reset_handler = qedf_eh_device_reset, /* lun reset */
        .eh_target_reset_handler = qedf_eh_target_reset, /* target reset */
+       .eh_bus_reset_handler = qedf_eh_bus_reset,
        .eh_host_reset_handler  = qedf_eh_host_reset,
        .slave_configure        = qedf_slave_configure,
        .dma_boundary = QED_HW_DMA_BOUNDARY,