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| author | Christoph Hellwig <hch@lst.de> | 2015-12-11 20:53:03 +0100 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2015-12-11 23:10:43 +0100 |
| commit | 14d3a3b2498edadec344cb11e60e66091f5daf63 (patch) | |
| tree | 2f6f6b383a94e98f4832061e3bfc66587377a9fa /drivers/infiniband/Kconfig | |
| parent | irq_poll: remove unused data and max fields (diff) | |
| download | linux-14d3a3b2498edadec344cb11e60e66091f5daf63.tar.xz linux-14d3a3b2498edadec344cb11e60e66091f5daf63.zip | |
IB: add a proper completion queue abstraction
This adds an abstraction that allows ULPs to simply pass a completion
object and completion callback with each submitted WR and let the RDMA
core handle the nitty gritty details of how to handle completion
interrupts and poll the CQ.
In detail there is a new ib_cqe structure which just contains the
completion callback, and which can be used to get at the containing
object using container_of. It is pointed to by the WR and WC as an
alternative to the wr_id field, similar to how many ULPs already use
the field to store a pointer using casts.
A driver using the new completion callbacks allocates it's CQs using
the new ib_create_cq API, which in addition to the number of CQEs and
the completion vectors also takes a mode on how we poll for CQEs.
Three modes are available: direct for drivers that never take CQ
interrupts and just poll for them, softirq to poll from softirq context
using the to be renamed blk-iopoll infrastructure which takes care of
rearming and budgeting, or a workqueue for consumer who want to be
called from user context.
Thanks a lot to Sagi Grimberg who helped reviewing the API, wrote
the current version of the workqueue code because my two previous
attempts sucked too much and converted the iSER initiator to the new
API.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'drivers/infiniband/Kconfig')
| -rw-r--r-- | drivers/infiniband/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/infiniband/Kconfig b/drivers/infiniband/Kconfig index aa26f3c3416b..282ec0b664fe 100644 --- a/drivers/infiniband/Kconfig +++ b/drivers/infiniband/Kconfig @@ -5,6 +5,7 @@ menuconfig INFINIBAND depends on NET depends on INET depends on m || IPV6 != m + select IRQ_POLL ---help--- Core support for InfiniBand (IB). Make sure to also select any protocols you wish to use as well as drivers for your |