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| author | Bodo Stroesser <bstroesser@ts.fujitsu.com> | 2020-07-26 17:35:10 +0200 |
|---|---|---|
| committer | Martin K. Petersen <martin.petersen@oracle.com> | 2020-07-28 22:25:31 -0400 |
| commit | 59526d7a187f4340bfc9b91f8a9ecb7cb39f982c (patch) | |
| tree | 6d5427c894222a2cd35bd68b3063a30768ce1e5d /drivers/target | |
| parent | bc2d214af5dbcf1e53be9a23d95905a585657ff4 (diff) | |
| download | lwn-59526d7a187f4340bfc9b91f8a9ecb7cb39f982c.tar.gz lwn-59526d7a187f4340bfc9b91f8a9ecb7cb39f982c.zip | |
scsi: target: tcmu: Make TMR notification optional
Add "tmr_notification" configfs attribute to tcmu devices. If the default
value 0 is used, tcmu only removes aborted commands from qfull_queue. If
user changes tmr_notification to 1, additionally TMR notifications will be
written to the cmd ring.
Link: https://lore.kernel.org/r/20200726153510.13077-9-bstroesser@ts.fujitsu.com
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Bodo Stroesser <bstroesser@ts.fujitsu.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/target')
| -rw-r--r-- | drivers/target/target_core_user.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index cb5a561a46e8..9b7592350502 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -118,6 +118,7 @@ struct tcmu_dev { #define TCMU_DEV_BIT_OPEN 0 #define TCMU_DEV_BIT_BROKEN 1 #define TCMU_DEV_BIT_BLOCKED 2 +#define TCMU_DEV_BIT_TMR_NOTIFY 3 unsigned long flags; struct uio_info uio_info; @@ -1260,6 +1261,9 @@ tcmu_tmr_notify(struct se_device *se_dev, enum tcm_tmreq_table tmf, if (unqueued) tcmu_set_next_deadline(&udev->qfull_queue, &udev->qfull_timer); + if (!test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags)) + goto unlock; + pr_debug("TMR event %d on dev %s, aborted cmds %d, afflicted cmd_ids %d\n", tcmu_tmr_type(tmf), udev->name, i, cmd_cnt); @@ -2706,6 +2710,39 @@ static ssize_t tcmu_emulate_write_cache_store(struct config_item *item, } CONFIGFS_ATTR(tcmu_, emulate_write_cache); +static ssize_t tcmu_tmr_notification_show(struct config_item *item, char *page) +{ + struct se_dev_attrib *da = container_of(to_config_group(item), + struct se_dev_attrib, da_group); + struct tcmu_dev *udev = TCMU_DEV(da->da_dev); + + return snprintf(page, PAGE_SIZE, "%i\n", + test_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags)); +} + +static ssize_t tcmu_tmr_notification_store(struct config_item *item, + const char *page, size_t count) +{ + struct se_dev_attrib *da = container_of(to_config_group(item), + struct se_dev_attrib, da_group); + struct tcmu_dev *udev = TCMU_DEV(da->da_dev); + u8 val; + int ret; + + ret = kstrtou8(page, 0, &val); + if (ret < 0) + return ret; + if (val > 1) + return -EINVAL; + + if (val) + set_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags); + else + clear_bit(TCMU_DEV_BIT_TMR_NOTIFY, &udev->flags); + return count; +} +CONFIGFS_ATTR(tcmu_, tmr_notification); + static ssize_t tcmu_block_dev_show(struct config_item *item, char *page) { struct se_device *se_dev = container_of(to_config_group(item), @@ -2787,6 +2824,7 @@ static struct configfs_attribute *tcmu_attrib_attrs[] = { &tcmu_attr_dev_config, &tcmu_attr_dev_size, &tcmu_attr_emulate_write_cache, + &tcmu_attr_tmr_notification, &tcmu_attr_nl_reply_supported, NULL, }; |