diff options
| author | Arun Easi <arun.easi@qlogic.com> | 2014-09-25 06:14:48 -0400 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2014-09-25 14:25:06 +0200 |
| commit | d154f35029c1f77b589389d2afb1e1766fb80c28 (patch) | |
| tree | 643e5a0f1b3556dae7a915d932065ade6deb2b66 /drivers/scsi/qla2xxx | |
| parent | 667024a36549186ce334c1027e434b45cf2c943d (diff) | |
qla2xxx: Enable SLER conditionally in target mode.
Sequence level error recovery (aka FC Tape) is not really required
for disk devices. On heavily loaded system, with slow turn around,
a bunch of status enquiries using REC puts additional burden to the
target, so just turn off SLER by default.
Signed-off-by: Arun Easi <arun.easi@qlogic.com>
Signed-off-by: Saurav Kashyap <saurav.kashyap@qlogic.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/scsi/qla2xxx')
| -rw-r--r-- | drivers/scsi/qla2xxx/qla_target.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c index 1503cf4120cf..85587fcd5a38 100644 --- a/drivers/scsi/qla2xxx/qla_target.c +++ b/drivers/scsi/qla2xxx/qla_target.c @@ -42,6 +42,11 @@ #include "qla_def.h" #include "qla_target.h" +static int ql2xtgt_tape_enable; +module_param(ql2xtgt_tape_enable, int, S_IRUGO|S_IWUSR); +MODULE_PARM_DESC(ql2xtgt_tape_enable, + "Enables Sequence level error recovery (aka FC Tape). Default is 0 - no SLER. 1 - Enable SLER."); + static char *qlini_mode = QLA2XXX_INI_MODE_STR_ENABLED; module_param(qlini_mode, charp, S_IRUGO); MODULE_PARM_DESC(qlini_mode, @@ -5172,8 +5177,13 @@ qlt_24xx_config_nvram_stage1(struct scsi_qla_host *vha, struct nvram_24xx *nv) nv->firmware_options_1 &= __constant_cpu_to_le32(~BIT_13); /* Enable initial LIP */ nv->firmware_options_1 &= __constant_cpu_to_le32(~BIT_9); - /* Enable FC tapes support */ - nv->firmware_options_2 |= __constant_cpu_to_le32(BIT_12); + if (ql2xtgt_tape_enable) + /* Enable FC Tape support */ + nv->firmware_options_2 |= cpu_to_le32(BIT_12); + else + /* Disable FC Tape support */ + nv->firmware_options_2 &= cpu_to_le32(~BIT_12); + /* Disable Full Login after LIP */ nv->host_p &= __constant_cpu_to_le32(~BIT_10); /* Enable target PRLI control */ @@ -5255,8 +5265,13 @@ qlt_81xx_config_nvram_stage1(struct scsi_qla_host *vha, struct nvram_81xx *nv) nv->firmware_options_1 &= __constant_cpu_to_le32(~BIT_13); /* Enable initial LIP */ nv->firmware_options_1 &= __constant_cpu_to_le32(~BIT_9); - /* Enable FC tapes support */ - nv->firmware_options_2 |= __constant_cpu_to_le32(BIT_12); + if (ql2xtgt_tape_enable) + /* Enable FC tape support */ + nv->firmware_options_2 |= cpu_to_le32(BIT_12); + else + /* Disable FC tape support */ + nv->firmware_options_2 &= cpu_to_le32(~BIT_12); + /* Disable Full Login after LIP */ nv->host_p &= __constant_cpu_to_le32(~BIT_10); /* Enable target PRLI control */ |