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[SCSI] qla2xxx: Ramp down queue depth for attached SCSI devices when driver resources are low.

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Signed-off-by: Chad Dupuis <chad.dupuis@qlogic.com>
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Chad Dupuis
2013-01-30 03:34:38 -05:00
committed by James Bottomley
parent 8d93f55022
commit 3c290d0b5f
6 changed files with 135 additions and 7 deletions
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9
drivers/scsi/qla2xxx/qla_def.h
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@@ -2536,6 +2536,7 @@ struct req_que {
srb_t **outstanding_cmds;
uint32_t current_outstanding_cmd;
uint16_t num_outstanding_cmds;
#define MAX_Q_DEPTH 32
int max_q_depth;
};
@@ -3058,6 +3059,12 @@ struct qla_hw_data {
struct work_struct idc_state_handler;
struct work_struct nic_core_unrecoverable;
#define HOST_QUEUE_RAMPDOWN_INTERVAL (60 * HZ)
#define HOST_QUEUE_RAMPUP_INTERVAL (30 * HZ)
unsigned long host_last_rampdown_time;
unsigned long host_last_rampup_time;
int cfg_lun_q_depth;
struct qlt_hw_data tgt;
};
@@ -3117,6 +3124,8 @@ typedef struct scsi_qla_host {
#define MPI_RESET_NEEDED 19 /* Initiate MPI FW reset */
#define ISP_QUIESCE_NEEDED 20 /* Driver need some quiescence */
#define SCR_PENDING 21 /* SCR in target mode */
#define HOST_RAMP_DOWN_QUEUE_DEPTH 22
#define HOST_RAMP_UP_QUEUE_DEPTH 23
uint32_t device_flags;
#define SWITCH_FOUND BIT_0