Signed-off-by: James Smart <James.Smart@xxxxxxxxxx>
---
drivers/scsi/lpfc/lpfc_scsi.c | 287 +++++++++++++++++++++++++++++++++++++++--
1 files changed, 274 insertions(+), 13 deletions(-)
--- a/drivers/scsi/lpfc/lpfc_scsi.c
+++ b/drivers/scsi/lpfc/lpfc_scsi.c
@@ -92,7 +92,6 @@ lpfc_update_stats(struct lpfc_hba *phba, struct lpfc_scsi_buf *lpfc_cmd)
spin_unlock_irqrestore(shost->host_lock, flags);
}
-
/**
* lpfc_send_sdev_queuedepth_change_event: Posts a queuedepth change
* event.
@@ -148,10 +147,17 @@ lpfc_send_sdev_queuedepth_change_event(struct lpfc_hba *phba,
return;
}
-/*
- * This function is called with no lock held when there is a resource
- * error in driver or in firmware.
- */
+/**
+ * lpfc_adjust_queue_depth: Post RAMP_DOWN_QUEUE event for worker thread.
+ * @phba: The Hba for which this call is being executed.
+ *
+ * This routine is called when there is resource error in driver or firmware.
+ * This routine posts WORKER_RAMP_DOWN_QUEUE event for @phba. This routine
+ * posts at most 1 event each second. This routine wakes up worker thread of
+ * @phba to process WORKER_RAM_DOWN_EVENT event.
+ *
+ * This routine should be called with no lock held.
+ **/
void
lpfc_adjust_queue_depth(struct lpfc_hba *phba)
{
@@ -182,10 +188,17 @@ lpfc_adjust_queue_depth(struct lpfc_hba *phba)
return;
}
-/*
- * This function is called with no lock held when there is a successful
- * SCSI command completion.
- */
+/**
+ * lpfc_rampup_queue_depth: Post RAMP_UP_QUEUE event for worker thread.
+ * @phba: The Hba for which this call is being executed.
+ *
+ * This routine post WORKER_RAMP_UP_QUEUE event for @phba vport. This routine
+ * post at most 1 event every 5 minute after last_ramp_up_time or
+ * last_rsrc_error_time. This routine wakes up worker thread of @phba
+ * to process WORKER_RAM_DOWN_EVENT event.
+ *
+ * This routine should be called with no lock held.
+ **/
static inline void
lpfc_rampup_queue_depth(struct lpfc_vport *vport,
struct scsi_device *sdev)
@@ -217,6 +230,14 @@ lpfc_rampup_queue_depth(struct lpfc_vport *vport,
return;
}
+/**
+ * lpfc_ramp_down_queue_handler: WORKER_RAMP_DOWN_QUEUE event handler.
+ * @phba: The Hba for which this call is being executed.
+ *
+ * This routine is called to process WORKER_RAMP_DOWN_QUEUE event for worker
+ * thread.This routine reduces queue depth for all scsi device on each vport
+ * associated with @phba.
+ **/
void
lpfc_ramp_down_queue_handler(struct lpfc_hba *phba)
{
@@ -267,6 +288,15 @@ lpfc_ramp_down_queue_handler(struct lpfc_hba *phba)
atomic_set(&phba->num_cmd_success, 0);
}
+/**
+ * lpfc_ramp_up_queue_handler: WORKER_RAMP_UP_QUEUE event handler.
+ * @phba: The Hba for which this call is being executed.
+ *
+ * This routine is called to process WORKER_RAMP_UP_QUEUE event for worker
+ * thread.This routine increases queue depth for all scsi device on each vport
+ * associated with @phba by 1. This routine also sets @phba num_rsrc_err and
+ * num_cmd_success to zero.
+ **/
void
lpfc_ramp_up_queue_handler(struct lpfc_hba *phba)
{
@@ -336,14 +366,21 @@ lpfc_scsi_dev_block(struct lpfc_hba *phba)
lpfc_destroy_vport_work_array(phba, vports);
}
-/*
+/**
+ * lpfc_new_scsi_buf: Scsi buffer allocator.
+ * @vport: The virtual port for which this call being executed.
+ *
* This routine allocates a scsi buffer, which contains all the necessary
* information needed to initiate a SCSI I/O. The non-DMAable buffer region
* contains information to build the IOCB. The DMAable region contains
- * memory for the FCP CMND, FCP RSP, and the inital BPL. In addition to
- * allocating memeory, the FCP CMND and FCP RSP BDEs are setup in the BPL
+ * memory for the FCP CMND, FCP RSP, and the initial BPL. In addition to
+ * allocating memory, the FCP CMND and FCP RSP BDEs are setup in the BPL
* and the BPL BDE is setup in the IOCB.
- */
+ *
+ * Return codes:
+ * NULL - Error
+ * Pointer to lpfc_scsi_buf data structure - Success
+ **/
static struct lpfc_scsi_buf *
lpfc_new_scsi_buf(struct lpfc_vport *vport)
{
@@ -452,6 +489,17 @@ lpfc_new_scsi_buf(struct lpfc_vport *vport)
return psb;
}
+/**
+ * lpfc_get_scsi_buf: Get a scsi buffer from lpfc_scsi_buf_list list of Hba.
+ * @phba: The Hba for which this call is being executed.
+ *
+ * This routine removes a scsi buffer from head of @phba lpfc_scsi_buf_list list
+ * and returns to caller.
+ *
+ * Return codes:
+ * NULL - Error
+ * Pointer to lpfc_scsi_buf - Success
+ **/
static struct lpfc_scsi_buf*
lpfc_get_scsi_buf(struct lpfc_hba * phba)
{
@@ -469,6 +517,14 @@ lpfc_get_scsi_buf(struct lpfc_hba * phba)
return lpfc_cmd;
}
+/**
+ * lpfc_release_scsi_buf: Return a scsi buffer back to hba lpfc_scsi_buf_list list.
+ * @phba: The Hba for which this call is being executed.
+ * @psb: The scsi buffer which is being released.
+ *
+ * This routine releases @psb scsi buffer by adding it to tail of @phba
+ * lpfc_scsi_buf_list list.
+ **/
static void
lpfc_release_scsi_buf(struct lpfc_hba *phba, struct lpfc_scsi_buf *psb)
{
@@ -480,6 +536,20 @@ lpfc_release_scsi_buf(struct lpfc_hba *phba, struct lpfc_scsi_buf *psb)
spin_unlock_irqrestore(&phba->scsi_buf_list_lock, iflag);
}
+/**
+ * lpfc_scsi_prep_dma_buf: Routine to do DMA mapping for scsi buffer.
+ * @phba: The Hba for which this call is being executed.
+ * @lpfc_cmd: The scsi buffer which is going to be mapped.
+ *
+ * This routine does the pci dma mapping for scatter-gather list of scsi cmnd
+ * field of @lpfc_cmd. This routine scans through sg elements and format the
+ * bdea. This routine also initializes all IOCB fields which are dependent on
+ * scsi command request buffer.
+ *
+ * Return codes:
+ * 1 - Error
+ * 0 - Success
+ **/
static int
lpfc_scsi_prep_dma_buf(struct lpfc_hba *phba, struct lpfc_scsi_buf *lpfc_cmd)
{
@@ -681,6 +751,15 @@ lpfc_send_scsi_error_event(struct lpfc_hba *phba, struct lpfc_vport *vport,
lpfc_worker_wake_up(phba);
return;
}
+
+/**
+ * lpfc_scsi_unprep_dma_buf: Routine to un-map DMA mapping of scatter gather.
+ * @phba: The Hba for which this call is being executed.
+ * @psb: The scsi buffer which is going to be un-mapped.
+ *
+ * This routine does DMA un-mapping of scatter gather list of scsi command
+ * field of @lpfc_cmd.
+ **/
static void
lpfc_scsi_unprep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
{
@@ -694,6 +773,16 @@ lpfc_scsi_unprep_dma_buf(struct lpfc_hba * phba, struct lpfc_scsi_buf * psb)
scsi_dma_unmap(psb->pCmd);
}
+/**
+ * lpfc_handler_fcp_err: FCP response handler.
+ * @vport: The virtual port for which this call is being executed.
+ * @lpfc_cmd: Pointer to lpfc_scsi_buf data structure.
+ * @rsp_iocb: The response IOCB which contains FCP error.
+ *
+ * This routine is called to process response IOCB with status field
+ * IOSTAT_FCP_RSP_ERROR. This routine sets result field of scsi command
+ * based upon SCSI and FCP error.
+ **/
static void
lpfc_handle_fcp_err(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
struct lpfc_iocbq *rsp_iocb)
@@ -828,6 +917,16 @@ lpfc_handle_fcp_err(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
lpfc_send_scsi_error_event(vport->phba, vport, lpfc_cmd, rsp_iocb);
}
+/**
+ * lpfc_scsi_cmd_iocb_cmpl: Scsi cmnd IOCB completion routine.
+ * @phba: The Hba for which this call is being executed.
+ * @pIocbIn: The command IOCBQ for the scsi cmnd.
+ * @pIocbOut: The response IOCBQ for the scsi cmnd .
+ *
+ * This routine assigns scsi command result by looking into response IOCB
+ * status field appropriately. This routine handles QUEUE FULL condition as
+ * well by ramping down device queue depth.
+ **/
static void
lpfc_scsi_cmd_iocb_cmpl(struct lpfc_hba *phba, struct lpfc_iocbq *pIocbIn,
struct lpfc_iocbq *pIocbOut)
@@ -1067,6 +1166,15 @@ lpfc_fcpcmd_to_iocb(uint8_t *data, struct fcp_cmnd *fcp_cmnd)
}
}
+/**
+ * lpfc_scsi_prep_cmnd: Routine to convert scsi cmnd to FCP information unit.
+ * @vport: The virtual port for which this call is being executed.
+ * @lpfc_cmd: The scsi command which needs to send.
+ * @pnode: Pointer to lpfc_nodelist.
+ *
+ * This routine initializes fcp_cmnd and iocb data structure from scsi command
+ * to transfer.
+ **/
static void
lpfc_scsi_prep_cmnd(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
struct lpfc_nodelist *pnode)
@@ -1152,6 +1260,19 @@ lpfc_scsi_prep_cmnd(struct lpfc_vport *vport, struct lpfc_scsi_buf *lpfc_cmd,
piocbq->vport = vport;
}
+/**
+ * lpfc_scsi_prep_task_mgmt_cmnd: Convert scsi TM cmnd to FCP information unit.
+ * @vport: The virtual port for which this call is being executed.
+ * @lpfc_cmd: Pointer to lpfc_scsi_buf data structure.
+ * @lun: Logical unit number.
+ * @task_mgmt_cmd: SCSI task management command.
+ *
+ * This routine creates FCP information unit corresponding to @task_mgmt_cmd.
+ *
+ * Return codes:
+ * 0 - Error
+ * 1 - Success
+ **/
static int
lpfc_scsi_prep_task_mgmt_cmd(struct lpfc_vport *vport,
struct lpfc_scsi_buf *lpfc_cmd,
@@ -1201,6 +1322,15 @@ lpfc_scsi_prep_task_mgmt_cmd(struct lpfc_vport *vport,
return 1;
}
+/**
+ * lpc_taskmgmt_def_cmpl: IOCB completion routine for task management command.
+ * @phba: The Hba for which this call is being executed.
+ * @cmdiocbq: Pointer to lpfc_iocbq data structure.
+ * @rspiocbq: Pointer to lpfc_iocbq data structure.
+ *
+ * This routine is IOCB completion routine for device reset and target reset
+ * routine. This routine release scsi buffer associated with lpfc_cmd.
+ **/
static void
lpfc_tskmgmt_def_cmpl(struct lpfc_hba *phba,
struct lpfc_iocbq *cmdiocbq,
@@ -1213,6 +1343,20 @@ lpfc_tskmgmt_def_cmpl(struct lpfc_hba *phba,
return;
}
+/**
+ * lpfc_scsi_tgt_reset: Target reset handler.
+ * @lpfc_cmd: Pointer to lpfc_scsi_buf data structure
+ * @vport: The virtual port for which this call is being executed.
+ * @tgt_id: Target ID.
+ * @lun: Lun number.
+ * @rdata: Pointer to lpfc_rport_data.
+ *
+ * This routine issues a TARGET RESET iocb to reset a target with @tgt_id ID.
+ *
+ * Return Code:
+ * 0x2003 - Error
+ * 0x2002 - Success.
+ **/
static int
lpfc_scsi_tgt_reset(struct lpfc_scsi_buf *lpfc_cmd, struct lpfc_vport *vport,
unsigned tgt_id, unsigned int lun,
@@ -1266,6 +1410,15 @@ lpfc_scsi_tgt_reset(struct lpfc_scsi_buf *lpfc_cmd, struct lpfc_vport *vport,
return ret;
}
+/**
+ * lpfc_info: Info entry point of scsi_host_template data structure.
+ * @host: The scsi host for which this call is being executed.
+ *
+ * This routine provides module information about hba.
+ *
+ * Reutrn code:
+ * Pointer to char - Success.
+ **/
const char *
lpfc_info(struct Scsi_Host *host)
{
@@ -1295,6 +1448,13 @@ lpfc_info(struct Scsi_Host *host)
return lpfcinfobuf;
}
+/**
+ * lpfc_poll_rearm_time: Routine to modify fcp_poll timer of hba.
+ * @phba: The Hba for which this call is being executed.
+ *
+ * This routine modifies fcp_poll_timer field of @phba by cfg_poll_tmo.
+ * The default value of cfg_poll_tmo is 10 milliseconds.
+ **/
static __inline__ void lpfc_poll_rearm_timer(struct lpfc_hba * phba)
{
unsigned long poll_tmo_expires =
@@ -1305,11 +1465,25 @@ static __inline__ void lpfc_poll_rearm_timer(struct lpfc_hba * phba)
poll_tmo_expires);
}
+/**
+ * lpfc_poll_start_timer: Routine to start fcp_poll_timer of HBA.
+ * @phba: The Hba for which this call is being executed.
+ *
+ * This routine starts the fcp_poll_timer of @phba.
+ **/
void lpfc_poll_start_timer(struct lpfc_hba * phba)
{
lpfc_poll_rearm_timer(phba);
}
+/**
+ * lpfc_poll_timeout: Restart polling timer.
+ * @ptr: Map to lpfc_hba data structure pointer.
+ *
+ * This routine restarts fcp_poll timer, when FCP ring polling is enable
+ * and FCP Ring interrupt is disable.
+ **/
+
void lpfc_poll_timeout(unsigned long ptr)
{
struct lpfc_hba *phba = (struct lpfc_hba *) ptr;
@@ -1321,6 +1495,20 @@ void lpfc_poll_timeout(unsigned long ptr)
}
}
+/**
+ * lpfc_queuecommand: Queuecommand entry point of Scsi Host Templater data
+ * structure.
+ * @cmnd: Pointer to scsi_cmnd data structure.
+ * @done: Pointer to done routine.
+ *
+ * Driver registers this routine to scsi midlayer to submit a @cmd to process.
+ * This routine prepares an IOCB from scsi command and provides to firmware.
+ * The @done callback is invoked after driver finished processing the command.
+ *
+ * Return value :
+ * 0 - Success
+ * SCSI_MLQUEUE_HOST_BUSY - Block all devices served by this host temporarily.
+ **/
static int
lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
{
@@ -1405,6 +1593,12 @@ lpfc_queuecommand(struct scsi_cmnd *cmnd, void (*done) (struct scsi_cmnd *))
return 0;
}
+/**
+ * lpfc_block_error_handler: Routine to block error handler.
+ * @cmnd: Pointer to scsi_cmnd data structure.
+ *
+ * This routine blocks execution till fc_rport state is not FC_PORSTAT_BLCOEKD.
+ **/
static void
lpfc_block_error_handler(struct scsi_cmnd *cmnd)
{
@@ -1421,6 +1615,17 @@ lpfc_block_error_handler(struct scsi_cmnd *cmnd)
return;
}
+/**
+ * lpfc_abort_handler: Eh_abort_handler entry point of Scsi Host Template data
+ *structure.
+ * @cmnd: Pointer to scsi_cmnd data structure.
+ *
+ * This routine aborts @cmnd pending in base driver.
+ *
+ * Return code :
+ * 0x2003 - Error
+ * 0x2002 - Success
+ **/
static int
lpfc_abort_handler(struct scsi_cmnd *cmnd)
{
@@ -1516,6 +1721,18 @@ lpfc_abort_handler(struct scsi_cmnd *cmnd)
return ret;
}
+/**
+ * lpfc_device_reset_handler: eh_device_reset entry point of Scsi Host Template
+ *data structure.
+ * @cmnd: Pointer to scsi_cmnd data structure.
+ *
+ * This routine does a device reset by sending a TARGET_RESET task management
+ * command.
+ *
+ * Return code :
+ * 0x2003 - Error
+ * 0ex2002 - Success
+ **/
static int
lpfc_device_reset_handler(struct scsi_cmnd *cmnd)
{
@@ -1633,6 +1850,17 @@ lpfc_device_reset_handler(struct scsi_cmnd *cmnd)
return ret;
}
+/**
+ * lpfc_bus_reset_handler: eh_bus_reset_handler entry point of Scsi Host
+ * Template data structure.
+ * @cmnd: Pointer to scsi_cmnd data structure.
+ *
+ * This routine does target reset to all target on @cmnd->device->host.
+ *
+ * Return Code:
+ * 0x2003 - Error
+ * 0x2002 - Success
+ **/
static int
lpfc_bus_reset_handler(struct scsi_cmnd *cmnd)
{
@@ -1723,6 +1951,20 @@ lpfc_bus_reset_handler(struct scsi_cmnd *cmnd)
return ret;
}
+/**
+ * lpfc_slave_alloc: slave_alloc entry point of Scsi Host Template data
+ * structure.
+ * @sdev: Pointer to scsi_device.
+ *
+ * This routine populates the cmds_per_lun count + 2 scsi_bufs into this host's
+ * globally available list of scsi buffers. This routine also makes sure scsi
+ * buffer is not allocated more than HBA limit conveyed to midlayer. This list
+ * of scsi buffer exists for the lifetime of the driver.
+ *
+ * Return codes:
+ * non-0 - Error
+ * 0 - Success
+ **/
static int
lpfc_slave_alloc(struct scsi_device *sdev)
{
@@ -1784,6 +2026,19 @@ lpfc_slave_alloc(struct scsi_device *sdev)
return 0;
}
+/**
+ * lpfc_slave_configure: slave_configure entry point of Scsi Host Templater data
+ * structure.
+ * @sdev: Pointer to scsi_device.
+ *
+ * This routine configures following items
+ * - Tag command queuing support for @sdev if supported.
+ * - Dev loss time out value of fc_rport.
+ * - Enable SLI polling for fcp ring if ENABLE_FCP_RING_POLLING flag is set.
+ *
+ * Return codes:
+ * 0 - Success
+ **/
static int
lpfc_slave_configure(struct scsi_device *sdev)
{
@@ -1813,6 +2068,12 @@ lpfc_slave_configure(struct scsi_device *sdev)
return 0;
}
+/**
+ * lpfc_slave_destroy: slave_destroy entry point of SHT data structure.
+ * @sdev: Pointer to scsi_device.
+ *
+ * This routine sets @sdev hostatdata filed to null.
+ **/
static void
lpfc_slave_destroy(struct scsi_device *sdev)
{
