[RFC-v2 00/11] nvmet: Add support for multi-tenant configfs

[Nicholas A. Bellinger]

From: Nicholas Bellinger <nab at linux-iscsi.org>

Hi folks,

Here's the second pass of a nvmet multi-tenant configfs layout,
following what we've learned in target_core_fabric_configfs.c
wrt to independent operation of storage endpoints.

Namely, it allows existing /sys/kernel/config/target/core/ backends
to be configfs symlinked into ../nvmet/subsystems/$SUBSYS_NQN/
as nvme namespaces.

Here is how the running RFC-v2 code currently looks:

/sys/kernel/config/nvmet/subsystems/
└── nqn.2003-01.org.linux-iscsi.NVMf.skylake-ep
    ├── hosts
    ├── namespaces
    │   └── 1
    │       └── ramdisk0 -> ../../../../../target/core/rd_mcp_1/ramdisk0
    └── ports
        └── loop
            ├── addr_adrfam
            ├── addr_portid
            ├── addr_traddr
            ├── addr_treq
            ├── addr_trsvcid
            ├── addr_trtype
            └── enable

The series exposes T10-PI from /sys/kernel/config/target/core/ as
ID_NS.ms + ID_NS.dps feature bits, and enables block integrity
support with nvmet/loop driver.

Note this series depends upon the following prerequisites of
target-core:

  http://marc.info/?l=linux-scsi&m=146527281416606&w=2

and of course, last week's earlier release of nvmet + friends:

  http://lists.infradead.org/pipermail/linux-nvme/2016-June/004754.html

Note the full set of patches is available from:

  https://git.kernel.org/cgit/linux/kernel/git/nab/target-pending.git/log/?h=nvmet-configfs-ng

v2 changes:

  - Introduce struct nvmet_port_binding in configfs-ng.c, in order
    to support 1:N mappings.
  - Convert nvmet_find_get_subsys() + discovery.c logic to use
    nvmet_port->port_binding_list.
  - Convert nvmet/loop to use nvmet_port_binding. (1:1 mapping)
  - Convert nvmet/rdma to use nvmet_port_binding + nvmet_rdma_ports.
    (1:N mapping)
  - Export nvmf_host_add + generate hostnqn if necessary. (HCH)
  - Make nvmet/loop multi-controller allocate it's own nvmf_host
    per controller. (HCH)
  - Change nvmet_fabric_ops get/put to use nvmf_disc_rsp_page_entry.
  - Convert nvmet_genctr to atomic_long_t.
  - Enable ../nvmet/subsystems/$NQN/hosts/$HOSTNQN group usage
    in configfs-ng.c.

Comments..?

--nab

Nicholas Bellinger (11):
  nvme-fabrics: Export nvmf_host_add + generate hostnqn if necessary
  nvmet: Add nvmet_fabric_ops get/put transport helpers
  nvmet: Add support for configfs-ng multi-tenant logic
  nvmet: Hookup nvmet_ns->dev to nvmet_ns_enable
  nvmet/loop: Add support for controller-per-port model +
    nvmet_port_binding
  nvmet/rdma: Convert to struct nvmet_port_binding
  nvmet/io-cmd: Hookup sbc_ops->execute_rw backend ops
  nvmet/io-cmd: Hookup sbc_ops->execute_sync_cache backend ops
  nvmet/io-cmd: Hookup sbc_ops->execute_unmap backend ops
  nvmet/admin-cmd: Hookup T10-PI to ID_NS.ms + ID_NS.dps feature bits
  nvmet/loop: Add support for bio integrity handling

 drivers/nvme/host/fabrics.c       |  18 +-
 drivers/nvme/host/fabrics.h       |   1 +
 drivers/nvme/target/Makefile      |   2 +-
 drivers/nvme/target/admin-cmd.c   |  17 +
 drivers/nvme/target/configfs-ng.c | 661 ++++++++++++++++++++++++++++++++++++++
 drivers/nvme/target/configfs.c    |  12 +-
 drivers/nvme/target/core.c        | 153 ++++++---
 drivers/nvme/target/discovery.c   |  31 +-
 drivers/nvme/target/io-cmd.c      | 169 ++++++----
 drivers/nvme/target/loop.c        | 223 +++++++++++--
 drivers/nvme/target/nvmet.h       |  67 +++-
 drivers/nvme/target/rdma.c        | 127 +++++++-
 12 files changed, 1317 insertions(+), 164 deletions(-)
 create mode 100644 drivers/nvme/target/configfs-ng.c

-- 
1.9.1