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| author | Jack Morgenstein <jackm@dev.mellanox.co.il> | 2018-08-27 08:35:55 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-10-05 13:30:05 +0300 |
| commit | 787f774bc72cec8d7d8c024b4e130d4e5535d6d8 (patch) | |
| tree | 50420fbadbcf54a3af0f5ef3bb3beabd2b9a2e37 /include | |
| parent | 6b48ef1f948458aeec8a82d7fb5727f62a6112b3 (diff) | |
| download | linux-787f774bc72cec8d7d8c024b4e130d4e5535d6d8.tar.xz | |
IB/core: Add an unbound WQ type to the new CQ API
commit f794809a7259dfaa3d47d90ef5a86007cf48b1ce upstream.
The upstream kernel commit cited below modified the workqueue in the
new CQ API to be bound to a specific CPU (instead of being unbound).
This caused ALL users of the new CQ API to use the same bound WQ.
Specifically, MAD handling was severely delayed when the CPU bound
to the WQ was busy handling (higher priority) interrupts.
This caused a delay in the MAD "heartbeat" response handling,
which resulted in ports being incorrectly classified as "down".
To fix this, add a new "unbound" WQ type to the new CQ API, so that users
have the option to choose either a bound WQ or an unbound WQ.
For MADs, choose the new "unbound" WQ.
Fixes: b7363e67b23e ("IB/device: Convert ib-comp-wq to be CPU-bound")
Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il>
Signed-off-by: Leon Romanovsky <leonro@mellanox.com>
Reviewed-by: Sagi Grimberg <sagi@grimberg.m>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
| -rw-r--r-- | include/rdma/ib_verbs.h | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/include/rdma/ib_verbs.h b/include/rdma/ib_verbs.h index a42535f252b5..0638b8aeba34 100644 --- a/include/rdma/ib_verbs.h +++ b/include/rdma/ib_verbs.h @@ -63,6 +63,7 @@ extern struct workqueue_struct *ib_wq; extern struct workqueue_struct *ib_comp_wq; +extern struct workqueue_struct *ib_comp_unbound_wq; union ib_gid { u8 raw[16]; @@ -1415,9 +1416,10 @@ struct ib_ah { typedef void (*ib_comp_handler)(struct ib_cq *cq, void *cq_context); enum ib_poll_context { - IB_POLL_DIRECT, /* caller context, no hw completions */ - IB_POLL_SOFTIRQ, /* poll from softirq context */ - IB_POLL_WORKQUEUE, /* poll from workqueue */ + IB_POLL_DIRECT, /* caller context, no hw completions */ + IB_POLL_SOFTIRQ, /* poll from softirq context */ + IB_POLL_WORKQUEUE, /* poll from workqueue */ + IB_POLL_UNBOUND_WORKQUEUE, /* poll from unbound workqueue */ }; struct ib_cq { @@ -1434,6 +1436,7 @@ struct ib_cq { struct irq_poll iop; struct work_struct work; }; + struct workqueue_struct *comp_wq; }; struct ib_srq { |