nvme-pci: limit maximum queue depth to 4095

We are going to use the upper 4-bits of the command_id for a generation
counter, so enforce the new queue depth upper limit. As we enforce
both min and max queue depth, use param_set_uint_minmax istead of
open coding it.

Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Daniel Wagner <dwagner@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index db7a9be..4880bad 100644 (file)
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -60,6 +60,8 @@ MODULE_PARM_DESC(sgl_threshold,
                "Use SGLs when average request segment size is larger or equal to "
                "this size. Use 0 to disable SGLs.");
 
+#define NVME_PCI_MIN_QUEUE_SIZE 2
+#define NVME_PCI_MAX_QUEUE_SIZE 4095
 static int io_queue_depth_set(const char *val, const struct kernel_param *kp);
 static const struct kernel_param_ops io_queue_depth_ops = {
        .set = io_queue_depth_set,
@@ -68,7 +70,7 @@ static const struct kernel_param_ops io_queue_depth_ops = {
 
 static unsigned int io_queue_depth = 1024;
 module_param_cb(io_queue_depth, &io_queue_depth_ops, &io_queue_depth, 0644);
-MODULE_PARM_DESC(io_queue_depth, "set io queue depth, should >= 2");
+MODULE_PARM_DESC(io_queue_depth, "set io queue depth, should >= 2 and < 4096");
 
 static int io_queue_count_set(const char *val, const struct kernel_param *kp)
 {
@@ -157,14 +159,8 @@ struct nvme_dev {
 
 static int io_queue_depth_set(const char *val, const struct kernel_param *kp)
 {
-       int ret;
-       u32 n;
-
-       ret = kstrtou32(val, 10, &n);
-       if (ret != 0 || n < 2)
-               return -EINVAL;
-
-       return param_set_uint(val, kp);
+       return param_set_uint_minmax(val, kp, NVME_PCI_MIN_QUEUE_SIZE,
+                       NVME_PCI_MAX_QUEUE_SIZE);
 }
 
 static inline unsigned int sq_idx(unsigned int qid, u32 stride)