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nvmet: introduce new max queue size configuration entry

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Using this port configuration, one will be able to set the maximal queue
size to be used for any controller that will be associated to the
configured port.

The default value stayed 1024 but each transport will be able to set the
its own values before enabling the port.

Introduce lower limit of 16 for minimal queue depth (same as we use in
the host fabrics drivers).

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Israel Rukshin <israelr@nvidia.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Guixin Liu <kanie@linux.alibaba.com>
Signed-off-by: Max Gurtovoy <mgurtovoy@nvidia.com>
Signed-off-by: Keith Busch <kbusch@kernel.org>
This commit is contained in:
Max Gurtovoy
2024-01-23 16:40:31 +02:00
committed by Keith Busch
parent ad178ba9d9
commit ca2b221d89
3 changed files with 46 additions and 3 deletions
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28
drivers/nvme/target/configfs.c
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@@ -273,6 +273,32 @@ static ssize_t nvmet_param_inline_data_size_store(struct config_item *item,
CONFIGFS_ATTR(nvmet_, param_inline_data_size);
static ssize_t nvmet_param_max_queue_size_show(struct config_item *item,
char *page)
{
struct nvmet_port *port = to_nvmet_port(item);
return snprintf(page, PAGE_SIZE, "%d\n", port->max_queue_size);
}
static ssize_t nvmet_param_max_queue_size_store(struct config_item *item,
const char *page, size_t count)
{
struct nvmet_port *port = to_nvmet_port(item);
int ret;
if (nvmet_is_port_enabled(port, __func__))
return -EACCES;
ret = kstrtoint(page, 0, &port->max_queue_size);
if (ret) {
pr_err("Invalid value '%s' for max_queue_size\n", page);
return -EINVAL;
}
return count;
}
CONFIGFS_ATTR(nvmet_, param_max_queue_size);
#ifdef CONFIG_BLK_DEV_INTEGRITY
static ssize_t nvmet_param_pi_enable_show(struct config_item *item,
char *page)
@@ -1859,6 +1885,7 @@ static struct configfs_attribute *nvmet_port_attrs[] = {
&nvmet_attr_addr_trtype,
&nvmet_attr_addr_tsas,
&nvmet_attr_param_inline_data_size,
&nvmet_attr_param_max_queue_size,
#ifdef CONFIG_BLK_DEV_INTEGRITY
&nvmet_attr_param_pi_enable,
#endif
@@ -1917,6 +1944,7 @@ static struct config_group *nvmet_ports_make(struct config_group *group,
INIT_LIST_HEAD(&port->subsystems);
INIT_LIST_HEAD(&port->referrals);
port->inline_data_size = -1; /* < 0 == let the transport choose */
port->max_queue_size = -1; /* < 0 == let the transport choose */
port->disc_addr.portid = cpu_to_le16(portid);
port->disc_addr.adrfam = NVMF_ADDR_FAMILY_MAX;