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IB/srpt: Detect session shutdown reliably

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The Last WQE Reached event is only generated after one or more work
requests have been queued on the QP associated with a session. Since
session shutdown can start before any work requests have been queued,
use a zero-length RDMA write to wait until a QP has been drained.

Additionally, rework the code for closing and disconnecting a session.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Cc: Sagi Grimberg <sagig@mellanox.com>
Cc: Alex Estrin <alex.estrin@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Bart Van Assche
2016-02-11 11:08:53 -08:00
committed by Doug Ledford
parent 8628991fbe
commit aaf45bd83e
2 changed files with 150 additions and 150 deletions
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18
drivers/infiniband/ulp/srpt/ib_srpt.h
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@@ -218,20 +218,20 @@ struct srpt_send_ioctx {
/**
* enum rdma_ch_state - SRP channel state.
* @CH_CONNECTING: QP is in RTR state; waiting for RTU.
* @CH_LIVE: QP is in RTS state.
* @CH_DISCONNECTING: DREQ has been received; waiting for DREP
* or DREQ has been send and waiting for DREP
* or .
* @CH_DRAINING: QP is in ERR state; waiting for last WQE event.
* @CH_RELEASING: Last WQE event has been received; releasing resources.
* @CH_CONNECTING: QP is in RTR state; waiting for RTU.
* @CH_LIVE: QP is in RTS state.
* @CH_DISCONNECTING: DREQ has been sent and waiting for DREP or DREQ has
* been received.
* @CH_DRAINING: DREP has been received or waiting for DREP timed out
* and last work request has been queued.
* @CH_DISCONNECTED: Last completion has been received.
*/
enum rdma_ch_state {
CH_CONNECTING,
CH_LIVE,
CH_DISCONNECTING,
CH_DRAINING,
CH_RELEASING
CH_DISCONNECTED,
};
/**
@@ -267,6 +267,8 @@ struct srpt_rdma_ch {
struct ib_cm_id *cm_id;
struct ib_qp *qp;
struct ib_cq *cq;
struct ib_cqe zw_cqe;
struct kref kref;
int rq_size;
u32 rsp_size;
atomic_t sq_wr_avail;