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| author | Chuck Lever <chuck.lever@oracle.com> | 2019-07-29 13:22:09 -0400 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2019-08-05 11:50:32 -0400 |
| commit | 20cf4e026730104892fa1268de0371a631cee294 (patch) | |
| tree | 08a7e60c303ff468d50a33d52e2bc98eab9b1b30 /include/rdma | |
| parent | 31d0e6c149b8c9a9bddc6d68f8600918bb771cb9 (diff) | |
| download | blackbird-op-linux-20cf4e026730104892fa1268de0371a631cee294.tar.gz blackbird-op-linux-20cf4e026730104892fa1268de0371a631cee294.zip | |
rdma: Enable ib_alloc_cq to spread work over a device's comp_vectors
Send and Receive completion is handled on a single CPU selected at
the time each Completion Queue is allocated. Typically this is when
an initiator instantiates an RDMA transport, or when a target
accepts an RDMA connection.
Some ULPs cannot open a connection per CPU to spread completion
workload across available CPUs and MSI vectors. For such ULPs,
provide an API that allows the RDMA core to select a completion
vector based on the device's complement of available comp_vecs.
ULPs that invoke ib_alloc_cq() with only comp_vector 0 are converted
to use the new API so that their completion workloads interfere less
with each other.
Suggested-by: Håkon Bugge <haakon.bugge@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Cc: <linux-cifs@vger.kernel.org>
Cc: <v9fs-developer@lists.sourceforge.net>
Link: https://lore.kernel.org/r/20190729171923.13428.52555.stgit@manet.1015granger.net
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'include/rdma')
| -rw-r--r-- | include/rdma/ib_verbs.h | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index c5f8a9f17063..2a1523ccd7ab 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -3711,6 +3711,25 @@ static inline struct ib_cq *ib_alloc_cq(struct ib_device *dev, void *private, NULL); } +struct ib_cq *__ib_alloc_cq_any(struct ib_device *dev, void *private, + int nr_cqe, enum ib_poll_context poll_ctx, + const char *caller); + +/** + * ib_alloc_cq_any: Allocate kernel CQ + * @dev: The IB device + * @private: Private data attached to the CQE + * @nr_cqe: Number of CQEs in the CQ + * @poll_ctx: Context used for polling the CQ + */ +static inline struct ib_cq *ib_alloc_cq_any(struct ib_device *dev, + void *private, int nr_cqe, + enum ib_poll_context poll_ctx) +{ + return __ib_alloc_cq_any(dev, private, nr_cqe, poll_ctx, + KBUILD_MODNAME); +} + /** * ib_free_cq_user - Free kernel/user CQ * @cq: The CQ to free |
