[PATCH V4 0/3] nvme: fix iod size calculation in nvme_probe()

[Chaitanya Kulkarni]

Hi,

This is a small patch series which fixes the IO size calulation in the
nvme_probe.

The first patch replaces the ctrl->page_size with a macro. The second
patch calculates the maximum value based on NVMe PRP and SGL size.

I've tested this patch with different block sizes 4k-128k on NVMe QEMU
and NVMe PCIe (non-SGL) controller.

In this version I've also added 3rd patch to get rid of the division in
nvme_unmap_data() since we've hardcoded the value of the ctrl page size
in the macro.

Regards,
Chaitanya

* Chagnes from V3:-
-------------------

1. Use (1 << NVME_CTRL_PAGE_SHIF)T for NVME_CTRL_PAGE_SIZE value.
2. Remove size and nseg parameters for the nvme_pci_iod_alloc_size() and
   hardcode them in the code.   
3. Added 3rd patch to get rid of the division in nvme_unmap_data().

* Changes from V2:-
-------------------

1. Modify commit log for patch 1.
2. Repalace ilog2(NVME_CTRL_PAGE_SIZE) ->  NVME_CTRL_PAGE_SHIFT.

* Changes from V1:-
-------------------

1. Remove the ctrl->page_size and use macro instead.
2. Get rid of the conditional operater and use max_t() for SGL vs PRP
   size calulation.

Chaitanya Kulkarni (3):
  nvme-core: replace ctrl page size with a macro
  nvme-pci: use max of PRP or SGL for iod size
  nvme-pci: get rid of the division in the fast path

 drivers/nvme/host/core.c | 19 ++++--------
 drivers/nvme/host/nvme.h |  9 +++++-
 drivers/nvme/host/pci.c  | 65 +++++++++++++++++++---------------------
 3 files changed, 45 insertions(+), 48 deletions(-)

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2.26.0