diff options
| 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.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.h')
| -rw-r--r-- | drivers/infiniband/hw/ocrdma/ocrdma.h | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/ocrdma/ocrdma.h b/drivers/infiniband/hw/ocrdma/ocrdma.h index 7c001b97b23f..61f508e74823 100644 --- a/drivers/infiniband/hw/ocrdma/ocrdma.h +++ b/drivers/infiniband/hw/ocrdma/ocrdma.h @@ -209,8 +209,8 @@ struct ocrdma_cq { */ u32 max_hw_cqe; bool phase_change; - bool armed, solicited; - bool arm_needed; + bool deferred_arm, deferred_sol; + bool first_arm; spinlock_t cq_lock ____cacheline_aligned; /* provide synchronization * to cq polling @@ -223,6 +223,7 @@ struct ocrdma_cq { struct ocrdma_ucontext *ucontext; dma_addr_t pa; u32 len; + u32 cqe_cnt; /* head of all qp's sq and rq for which cqes need to be flushed * by the software. @@ -436,4 +437,17 @@ static inline int ocrdma_resolve_dmac(struct ocrdma_dev *dev, return 0; } +static inline int ocrdma_get_eq_table_index(struct ocrdma_dev *dev, + int eqid) +{ + int indx; + + for (indx = 0; indx < dev->eq_cnt; indx++) { + if (dev->eq_tbl[indx].q.id == eqid) + return indx; + } + + return -EINVAL; +} + #endif |