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nvme: add 'iopolicy' module parameter

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While the 'iopolicy' sysfs attribute can be set at runtime, most
storage arrays prefer to use the 'round-robin' iopolicy per default.
We can use udev rules to set this, but is getting rather unwieldy
for rebranded arrays as we would have to update the udev rules
anytime a new array shows up, leading to the same mess we currently
have in multipathd for configuring the RDAC arrays.

Hence this patch adds a module parameter 'iopolicy' to allow the
admin to switch the default, and to do away with the need for a
udev rule here.

Signed-off-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Hannes Reinecke 2021-12-20 13:51:45 +01:00 committed by Christoph Hellwig
parent 3a605e32a7
commit e3d3479439
3 changed files with 41 additions and 8 deletions
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4
drivers/nvme/host/core.c
View File

@ -2746,9 +2746,7 @@ static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
return -EINVAL;
}
subsys->awupf = le16_to_cpu(id->awupf);
#ifdef CONFIG_NVME_MULTIPATH
subsys->iopolicy = NVME_IOPOLICY_NUMA;
#endif
nvme_mpath_default_iopolicy(subsys);
subsys->dev.class = nvme_subsys_class;
subsys->dev.release = nvme_release_subsystem;

41
drivers/nvme/host/multipath.c
View File

@ -13,6 +13,42 @@ module_param(multipath, bool, 0444);
MODULE_PARM_DESC(multipath,
"turn on native support for multiple controllers per subsystem");
static const char *nvme_iopolicy_names[] = {
[NVME_IOPOLICY_NUMA] = "numa",
[NVME_IOPOLICY_RR] = "round-robin",
};
static int iopolicy = NVME_IOPOLICY_NUMA;
static int nvme_set_iopolicy(const char *val, const struct kernel_param *kp)
{
if (!val)
return -EINVAL;
if (!strncmp(val, "numa", 4))
iopolicy = NVME_IOPOLICY_NUMA;
else if (!strncmp(val, "round-robin", 11))
iopolicy = NVME_IOPOLICY_RR;
else
return -EINVAL;
return 0;
}
static int nvme_get_iopolicy(char *buf, const struct kernel_param *kp)
{
return sprintf(buf, "%s\n", nvme_iopolicy_names[iopolicy]);
}
module_param_call(iopolicy, nvme_set_iopolicy, nvme_get_iopolicy,
&iopolicy, 0644);
MODULE_PARM_DESC(iopolicy,
"Default multipath I/O policy; 'numa' (default) or 'round-robin'");
void nvme_mpath_default_iopolicy(struct nvme_subsystem *subsys)
{
subsys->iopolicy = iopolicy;
}
void nvme_mpath_unfreeze(struct nvme_subsystem *subsys)
{
struct nvme_ns_head *h;
@ -706,11 +742,6 @@ void nvme_mpath_stop(struct nvme_ctrl *ctrl)
struct device_attribute subsys_attr_##_name = \
__ATTR(_name, _mode, _show, _store)
static const char *nvme_iopolicy_names[] = {
[NVME_IOPOLICY_NUMA] = "numa",
[NVME_IOPOLICY_RR] = "round-robin",
};
static ssize_t nvme_subsys_iopolicy_show(struct device *dev,
struct device_attribute *attr, char *buf)
{

4
drivers/nvme/host/nvme.h
View File

@ -767,6 +767,7 @@ static inline bool nvme_ctrl_use_ana(struct nvme_ctrl *ctrl)
void nvme_mpath_unfreeze(struct nvme_subsystem *subsys);
void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys);
void nvme_mpath_start_freeze(struct nvme_subsystem *subsys);
void nvme_mpath_default_iopolicy(struct nvme_subsystem *subsys);
bool nvme_mpath_set_disk_name(struct nvme_ns *ns, char *disk_name, int *flags);
void nvme_failover_req(struct request *req);
void nvme_kick_requeue_lists(struct nvme_ctrl *ctrl);
@ -864,6 +865,9 @@ static inline void nvme_mpath_wait_freeze(struct nvme_subsystem *subsys)
static inline void nvme_mpath_start_freeze(struct nvme_subsystem *subsys)
{
}
static inline void nvme_mpath_default_iopolicy(struct nvme_subsystem *subsys)
{
}
#endif /* CONFIG_NVME_MULTIPATH */
int nvme_revalidate_zones(struct nvme_ns *ns);