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nvmet_fc: add target feature flags for upcall isr contexts

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Two new feature flags were added to control whether upcalls to the
transport result in context switches or stay in the calling context.

NVMET_FCTGTFEAT_CMD_IN_ISR:
  By default, if the flag is not set, the transport assumes the
  lldd is in a non-isr context and in the cpu context it should be
  for the io queue. As such, the cmd handler is called directly in the
  calling context.
  If the flag is set, indicating the upcall is an isr context, the
  transport mandates a transition to a workqueue. The workqueue assigned
  to the queue is used for the context.
NVMET_FCTGTFEAT_OPDONE_IN_ISR
  By default, if the flag is not set, the transport assumes the
  lldd is in a non-isr context and in the cpu context it should be
  for the io queue. As such, the fcp operation done callback is called
  directly in the calling context.
  If the flag is set, indicating the upcall is an isr context, the
  transport mandates a transition to a workqueue. The workqueue assigned
  to the queue is used for the context.

Updated lpfc for flags

Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Sagi Grimberg <sagi@grimberg.me>
This commit is contained in:
James Smart
2017-04-11 11:32:28 -07:00
committed by Christoph Hellwig
parent 1c05cf9058
commit 39498faef7
4 changed files with 56 additions and 6 deletions
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16
include/linux/nvme-fc-driver.h
View File

@@ -655,6 +655,22 @@ enum {
* on. The transport should pick a cpu to schedule the work
* on.
*/
NVMET_FCTGTFEAT_CMD_IN_ISR = (1 << 2),
/* Bit 2: When 0, the LLDD is calling the cmd rcv handler
* in a non-isr context, allowing the transport to finish
* op completion in the calling context. When 1, the LLDD
* is calling the cmd rcv handler in an ISR context,
* requiring the transport to transition to a workqueue
* for op completion.
*/
NVMET_FCTGTFEAT_OPDONE_IN_ISR = (1 << 3),
/* Bit 3: When 0, the LLDD is calling the op done handler
* in a non-isr context, allowing the transport to finish
* op completion in the calling context. When 1, the LLDD
* is calling the op done handler in an ISR context,
* requiring the transport to transition to a workqueue
* for op completion.
*/
};