[PATCH-v2 0/3] target/vhost-scsi: Add per-cpu ida tag pre-allocation for v3.12

["Nicholas A. Bellinger" <nab@linux-iscsi.org>]

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

Hi folks,

This is an updated series for adding tag pre-allocation support of
target fabric descriptor memory, utilizing Kent's latest in-flight
per-cpu ida bits here:

   [PATCH v3] lib/idr.c rewrite, percpu ida/tag allocator
   http://marc.info/?l=linux-kernel&m=137308733526328&w=2

Patch #1 includes target-core setup of se_sess->sess_cmd_map +
se_sess->sess_tag_pool resources at session creation time, using
fabric independent code in transport_init_session_tags().

Patch #2 is the initial conversion of vhost-scsi fabric code to use
per-cpu ida logic for obtaining a new tcm_vhost_cmd descriptor via
vhost_scsi_get_tag() during vhost_work_fn_t->handle_kick() ->
vhost_scsi_handle_vq() callback execution.

And patch #3 is a vhost-scsi change that adds pre-allocation of per
tcm_vhost_cmd descriptor scatterlist + user-space page pointer memory,
that allows the last two fast-path allocations to be dropped from
tcm_vhost_submission_work() -> vhost_scsi_map_to_sgl() fast-path
execution.

Please review as v3.12 material.

Thanks!

--nab

Nicholas Bellinger (3):
  target: Add transport_init_session_tags using per-cpu ida
  vhost/scsi: Convert to per-cpu ida_alloc + ida_free command map
  vhost/scsi: Add pre-allocation for tv_cmd SGL + upages memory

 drivers/target/target_core_transport.c |   33 ++++++++
 drivers/vhost/scsi.c                   |  130 ++++++++++++++++++++++++--------
 include/target/target_core_base.h      |    5 +
 include/target/target_core_fabric.h    |    1 +
 4 files changed, 137 insertions(+), 32 deletions(-)

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1.7.2.5