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authorKeith Busch <keith.busch@intel.com>2015-08-12 16:17:54 -0600
committerJens Axboe <axboe@fb.com>2015-08-17 15:52:23 -0600
commite824410ffcf4b245296b56c6fdf7b9797fce8c3e (patch)
tree3e3b952e272af0b8d79c80d9e5c982f6bf94c677 /drivers/block
parent22d109c1bb312dbf321f3d0ab1b0ed94f1a7e304 (diff)
downloadlinux-e824410ffcf4b245296b56c6fdf7b9797fce8c3e.tar.bz2
NVMe: Set queue max segments
This sets the queue's max segment size to match the device's capabilities. The default of 128 is usable until a device's transfer capability exceeds 512k, assuming a device page size of 4k. Many nvme devices exceed that transfer limit, so this lets the block layer know what kind of commands it to allow to form rather than unnecessarily split them. One additional segment is added to account for a transfer that may start in the middle of a page. Signed-off-by: Keith Busch <keith.busch@intel.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'drivers/block')
-rw-r--r--drivers/block/nvme-core.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index 666e994fd622..2e16000693bf 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -2120,8 +2120,11 @@ static void nvme_alloc_ns(struct nvme_dev *dev, unsigned nsid)
list_add_tail(&ns->list, &dev->namespaces);
blk_queue_logical_block_size(ns->queue, 1 << ns->lba_shift);
- if (dev->max_hw_sectors)
+ if (dev->max_hw_sectors) {
blk_queue_max_hw_sectors(ns->queue, dev->max_hw_sectors);
+ blk_queue_max_segments(ns->queue,
+ ((dev->max_hw_sectors << 9) / dev->page_size) + 1);
+ }
if (dev->stripe_size)
blk_queue_chunk_sectors(ns->queue, dev->stripe_size >> 9);
if (dev->vwc & NVME_CTRL_VWC_PRESENT)