[PATCH 00/16 v7] nvme-rdma/nvmet-rdma: Add metadata/T10-PI support

[Max Gurtovoy <maxg@mellanox.com>]

Hello Sagi, Christoph, Keith, Martin, Jens, James and Co

This patchset adds metadata (T10-PI) support for NVMeoF/RDMA host side
and target side, using signature verbs API. This set starts with a few
preparation commits to the the block layer and NVMe host core layer. It
continues with NVMeoF/RDMA host implementation and preparations to NVMe
target core layer. The patchset ends with NVMeoF/RDMA target
implementation.

In V7 I mainly did some refactoring to NVMe/RDMA drivers for host and
target sides according to Christoph's suggestions. As agreed, for the
initial mode, we'll use T10-PI/metadata for capable devices and act
according to target controller and namespaces configuration.

Configuration:
Host:
 - same as before

Target:
 - echo 1 > /config/nvmet/subsystems/${NAME}/attr_pi_enable
 - echo 1 > /config/nvmet/ports/${PORT_NUM}/param_pi_enable

The code was tested using Mellanox's ConnectX-4/ConnectX-5 HCAs.
This series applies on top of nvme_5.8 branch cleanly.

Changes from v6:
 - added preparation patch for genhd.h
 - added "Reviewed-by" (Christoph) to patches 2, 3, 4, 6, 10, 13
 - refactor nvme-rdma/nvmet-rdma code according to Christoph suggestions
 - rename md to metadata to make code more readable
 
Changes from v5:
 - rebased over nvme_5.8
 - configure RDMA controllers for T10-PI by default (if capable)
 - removed RW api patch for exporting single MR length (will add it in the future if needed)
 - Implemented Christoph's suggestions for NVMe host core
 
Changes from v4:
 - removed get_mdts patches (merged)
 - added enum nvme_ns_features instead of defines (patch 1/17)
 - rename pi/prot to md (patches 2/17 + 6/17 + 8/17 + 9/17 + 10/17)
 - another rebase

Changes from v3:
 - Added Reviewed-by signatures
 - New RDMA/rw patch (Patch 17/19)
 - Add mdts setting op for controllers (Patches 14/19, 18/19)
 - Rename NVME_NS_DIX_SUPPORTED to NVME_NS_MD_HOST_SUPPORTED and
   NVME_NS_DIF_SUPPORTED to NVME_NS_MD_CTRL_SUPPORTED (Patch 01/19)
 - Split "nvme: Introduce namespace features flag" patch (patch 02/19)
 - Rename nvmet_rdma_set_diff_domain to nvmet_rdma_set_sig_domain
   and nvme_rdma_set_diff_domain to nvme_rdma_set_sig_domain
   (Patches 08/19, 19/19)
 - Remove ns parameter from nvme_rdma_set_sig_domain/nvmet_rdma_set_sig_domain
   functions (patch 08/19, 19/19)
 - Rebase over nvme-5.7 branch

Changes from v2:
 - Convert the virtual start sector (which passed to bip_set_seed function)
   to be in integrity interval units (Patch 14/15)
 - Clarify some commit messages

Changes from v1:
 - Added Reviewed-by signatures
 - Added namespace features flag (Patch 01/15)
 - Remove nvme_ns_has_pi function (Patch 01/15)
 - Added has_pi field to struct nvme_request (Patch 01/15)
 - Subject change for patch 02/15
 - Fix comment for PCI metadata (Patch 03/15)
 - Rebase over "nvme: Avoid preallocating big SGL for data" patchset
 - Introduce NVME_INLINE_PROT_SG_CNT flag (Patch 05/15)
 - Introduce nvme_rdma_sgl structure (Patch 06/15)
 - Remove first_sgl pointer from struct nvme_rdma_request (Patch 06/15)
 - Split nvme-rdma patches (Patches 06/15, 07/15)
 - Rename is_protected to use_pi (Patch 07/15)
 - Refactor nvme_rdma_get_max_fr_pages function (Patch 07/15)
 - Added ifdef CONFIG_BLK_DEV_INTEGRITY (Patches 07/15, 09/15, 13/15,
   14/15, 15/15)
 - Added port configfs pi_enable (Patch 14/15)

Israel Rukshin (9):
  nvme: introduce NVME_INLINE_METADATA_SG_CNT
  nvme-rdma: introduce nvme_rdma_sgl structure
  nvmet: add metadata characteristics for a namespace
  nvmet: rename nvmet_rw_len to nvmet_rw_data_len
  nvmet: rename nvmet_check_data_len to nvmet_check_transfer_len
  nvme: add Metadata Capabilities enumerations
  nvmet: add metadata/T10-PI support
  nvmet: add metadata support for block devices
  nvmet-rdma: add metadata/T10-PI support

James Smart (1):
  nvme: make nvme_ns_has_pi accessible to transports

Max Gurtovoy (6):
  block: always define struct blk_integrity in genhd.h
  nvme: introduce namespace features flag
  nvme: introduce NVME_NS_METADATA_SUPPORTED flag
  nvme: introduce max_integrity_segments ctrl attribute
  nvme: enforce extended LBA format for fabrics metadata
  nvme-rdma: add metadata/T10-PI support

 drivers/nvme/host/core.c          |  83 +++++++---
 drivers/nvme/host/lightnvm.c      |   5 +-
 drivers/nvme/host/nvme.h          |  17 ++-
 drivers/nvme/host/pci.c           |   6 +
 drivers/nvme/host/rdma.c          | 313 ++++++++++++++++++++++++++++++++++----
 drivers/nvme/target/admin-cmd.c   |  40 +++--
 drivers/nvme/target/configfs.c    |  58 +++++++
 drivers/nvme/target/core.c        | 122 +++++++++++----
 drivers/nvme/target/discovery.c   |   8 +-
 drivers/nvme/target/fabrics-cmd.c |  15 +-
 drivers/nvme/target/io-cmd-bdev.c | 113 +++++++++++++-
 drivers/nvme/target/io-cmd-file.c |   6 +-
 drivers/nvme/target/nvmet.h       |  33 +++-
 drivers/nvme/target/rdma.c        | 231 +++++++++++++++++++++++++---
 include/linux/genhd.h             |   4 -
 include/linux/nvme.h              |   6 +
 16 files changed, 919 insertions(+), 141 deletions(-)

-- 
1.8.3.1


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