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| author |   Devesh Sharma <devesh.sharma@emulex.com> | 2014-02-04 11:56:54 +0530 |
|---|---|---|
| committer |   Roland Dreier <roland@purestorage.com> | 2014-04-03 08:29:34 -0700 |
| commit | ea61762679cd4d409dcaa6f502f190f4c8156d09 (patch) | |
| tree | 5827d101e41788a4ff93c2368eaa4d3ec5ae337a /drivers/infiniband/hw/ocrdma/ocrdma_hw.h | |
| parent | RDMA/ocrdma: Fix compiler warning (diff) | |
| download | linux-dev-ea61762679cd4d409dcaa6f502f190f4c8156d09.tar.xz linux-dev-ea61762679cd4d409dcaa6f502f190f4c8156d09.zip | |
RDMA/ocrdma: EQ full catastrophe avoidance
Stale entries in the CQ being destroyed causes hardware to generate
EQEs indefinitely for a given CQ. Thus causing uncontrolled execution
of irq_handler. This patch fixes this using following sementics:
* irq_handler will ring EQ doorbell atleast once and implement budgeting scheme.
* cq_destroy will count number of valid entires during destroy and ring
cq-db so that hardware does not generate uncontrolled EQE.
* cq_destroy will synchronize with last running irq_handler instance.
* arm_cq will always defer arming CQ till poll_cq, except for the first arm_cq call.
* poll_cq will always ring cq-db with arm=SET if arm_cq was called prior to enter poll_cq.
* poll_cq will always ring cq-db with arm=UNSET if arm_cq was not called prior to enter poll_cq.
Signed-off-by: Devesh Sharma <devesh.sharma@emulex.com>
Signed-off-by: Selvin Xavier <selvin.xavier@emulex.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband/hw/ocrdma/ocrdma_hw.h')
| -rw-r--r-- | drivers/infiniband/hw/ocrdma/ocrdma_hw.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/infiniband/hw/ocrdma/ocrdma_hw.h b/drivers/infiniband/hw/ocrdma/ocrdma_hw.h index db3d55f368bf..77da536d5d96 100644 --- a/drivers/infiniband/hw/ocrdma/ocrdma_hw.h +++ b/drivers/infiniband/hw/ocrdma/ocrdma_hw.h @@ -131,5 +131,6 @@ int ocrdma_qp_state_change(struct ocrdma_qp *, enum ib_qp_state new_state, bool ocrdma_is_qp_in_sq_flushlist(struct ocrdma_cq *, struct ocrdma_qp *); bool ocrdma_is_qp_in_rq_flushlist(struct ocrdma_cq *, struct ocrdma_qp *); void ocrdma_flush_qp(struct ocrdma_qp *); +int ocrdma_get_irq(struct ocrdma_dev *dev, struct ocrdma_eq *eq); #endif /* __OCRDMA_HW_H__ */ |