[-next,0/3] scsi/fcoe: Play nicer with PREEMPT_RT

Message

Davidlohr Bueso Nov. 17, 2021, 2:59 a.m. UTC

Hi,

The following are the result of trying to get rid of the out-of-tree
equivalent[1].

Patches 1 and 2 remove the actual scheduling while atomic scenarios.

Patch 3 could be considered optional because afaict the stats do not
actually have blocking calls while having preemption disabled. But
from an RT perspective it's still beneficial as the region remains
preemptible.

Compile tested only.

[1] https://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git/tree/patches/scsi_fcoe__Make_RT_aware..patch?h=linux-5.15.y-rt-patches

Thanks!

Davidlohr Bueso (3):
  scsi/libfc: Remove get_cpu() semantics in fc_exch_em_alloc()
  scsi/fcoe: Add a local_lock to fcoe_percpu
  scsi/fcoe: Add a local_lock to percpu localport statistics

 drivers/scsi/bnx2fc/bnx2fc_fcoe.c | 16 ++++++++------
 drivers/scsi/bnx2fc/bnx2fc_io.c   |  5 +++--
 drivers/scsi/fcoe/fcoe.c          | 35 +++++++++++++++++++------------
 drivers/scsi/fcoe/fcoe_ctlr.c     | 24 +++++++++++++--------
 drivers/scsi/libfc/fc_exch.c      |  3 +--
 drivers/scsi/libfc/fc_fcp.c       | 31 +++++++++++++++++++--------
 drivers/scsi/qedf/qedf_main.c     |  7 ++++---
 include/scsi/libfc.h              |  7 +++++++
 include/scsi/libfcoe.h            |  2 ++
 9 files changed, 86 insertions(+), 44 deletions(-)