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lightnvm: Inherit mdts from the parent nvme device

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Current lightnvm and pblk implementation does not care about NVMe max
data transfer size, which can be smaller than 64*K=256K. There are
existing NVMe controllers which NVMe max data transfer size is lower
that 256K (for example 128K, which happens for existing NVMe
controllers which are NVMe spec compliant). Such a controllers are not
able to handle command which contains 64 PPAs, since the the size of
DMAed buffer will be above the capabilities of such a controller.

Signed-off-by: Igor Konopko <[email protected]>
Reviewed-by: Hans Holmberg <[email protected]>
Reviewed-by: Javier González <[email protected]>
Signed-off-by: Matias Bjørling <[email protected]>
Signed-off-by: Jens Axboe <[email protected]>
This commit is contained in:
Igor Konopko 2019-05-04 20:37:55 +02:00 • committed by Jens Axboe
commit a14669ebc0
3 changed files with 9 additions and 2 deletions
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9
drivers/lightnvm/core.c
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@ -325,6 +325,7 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
struct nvm_target *t;
struct nvm_tgt_dev *tgt_dev;
void *targetdata;
unsigned int mdts;
int ret;
switch (create->conf.type) {
@ -412,8 +413,12 @@ static int nvm_create_tgt(struct nvm_dev *dev, struct nvm_ioctl_create *create)
tdisk->private_data = targetdata;
tqueue->queuedata = targetdata;
blk_queue_max_hw_sectors(tqueue,
(dev->geo.csecs >> 9) * NVM_MAX_VLBA);
mdts = (dev->geo.csecs >> 9) * NVM_MAX_VLBA;
if (dev->geo.mdts) {
mdts = min_t(u32, dev->geo.mdts,
(dev->geo.csecs >> 9) * NVM_MAX_VLBA);
}
blk_queue_max_hw_sectors(tqueue, mdts);
set_capacity(tdisk, tt->capacity(targetdata));
add_disk(tdisk);