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nvme: allow for size limitations from transport drivers
Some transport drivers may have a lower transfer size than the controller. So allow the transport to set it in the controller max_hw_sectors. Reviewed-by: Sagi Grimberg <sagi@grimberg.me> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Jens Axboe <axboe@fb.com>
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1 changed files with 5 additions and 2 deletions
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@ -1105,6 +1105,7 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
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struct nvme_id_ctrl *id;
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u64 cap;
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int ret, page_shift;
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u32 max_hw_sectors;
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ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs);
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if (ret) {
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@ -1137,9 +1138,11 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
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memcpy(ctrl->model, id->mn, sizeof(id->mn));
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memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr));
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if (id->mdts)
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ctrl->max_hw_sectors = 1 << (id->mdts + page_shift - 9);
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max_hw_sectors = 1 << (id->mdts + page_shift - 9);
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else
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ctrl->max_hw_sectors = UINT_MAX;
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max_hw_sectors = UINT_MAX;
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ctrl->max_hw_sectors =
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min_not_zero(ctrl->max_hw_sectors, max_hw_sectors);
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if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && id->vs[3]) {
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unsigned int max_hw_sectors;
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