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svcrdma: Move the QP and cm_id destruction to svc_rdma_free 

Move the destruction of the QP and CM_ID to the free path so that the
QP cleanup code doesn't race with the dto_tasklet handling flushed WR.
The QP reference is not needed because we now have a reference for
every WR.

Also add a guard in the SQ and RQ completion handlers to ignore
calls generated by some providers when the QP is destroyed.

Signed-off-by: Tom Tucker <tom@opengridcomputing.com>
This commit is contained in:
Tom Tucker 2008-05-01 11:13:50 -05:00
parent 0905c0f0a2
commit 1711386c62
1 changed files with 20 additions and 20 deletions
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36
net/sunrpc/xprtrdma/svc_rdma_transport.c
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@ -252,6 +252,10 @@ static void rq_comp_handler(struct ib_cq *cq, void *cq_context)
struct svcxprt_rdma *xprt = cq_context;
unsigned long flags;
/* Guard against unconditional flush call for destroyed QP */
if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0)
return;
/*
* Set the bit regardless of whether or not it's on the list
* because it may be on the list already due to an SQ
@ -393,6 +397,10 @@ static void sq_comp_handler(struct ib_cq *cq, void *cq_context)
struct svcxprt_rdma *xprt = cq_context;
unsigned long flags;
/* Guard against unconditional flush call for destroyed QP */
if (atomic_read(&xprt->sc_xprt.xpt_ref.refcount)==0)
return;
/*
* Set the bit regardless of whether or not it's on the list
* because it may be on the list already due to an RQ
@ -852,7 +860,6 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
newxprt->sc_sq_depth = qp_attr.cap.max_send_wr;
newxprt->sc_max_requests = qp_attr.cap.max_recv_wr;
}
svc_xprt_get(&newxprt->sc_xprt);
newxprt->sc_qp = newxprt->sc_cm_id->qp;
/* Register all of physical memory */
@ -926,10 +933,8 @@ static struct svc_xprt *svc_rdma_accept(struct svc_xprt *xprt)
dprintk("svcrdma: failure accepting new connection rc=%d.\n", ret);
/* Take a reference in case the DTO handler runs */
svc_xprt_get(&newxprt->sc_xprt);
if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp)) {
if (newxprt->sc_qp && !IS_ERR(newxprt->sc_qp))
ib_destroy_qp(newxprt->sc_qp);
svc_xprt_put(&newxprt->sc_xprt);
}
rdma_destroy_id(newxprt->sc_cm_id);
/* This call to put will destroy the transport */
svc_xprt_put(&newxprt->sc_xprt);
@ -941,10 +946,7 @@ static void svc_rdma_release_rqst(struct svc_rqst *rqstp)
}
/*
* When connected, an svc_xprt has at least three references:
*
* - A reference held by the QP. We still hold that here because this
* code deletes the QP and puts the reference.
* When connected, an svc_xprt has at least two references:
*
* - A reference held by the cm_id between the ESTABLISHED and
* DISCONNECTED events. If the remote peer disconnected first, this
@ -953,7 +955,7 @@ static void svc_rdma_release_rqst(struct svc_rqst *rqstp)
* - A reference held by the svc_recv code that called this function
* as part of close processing.
*
* At a minimum two references should still be held.
* At a minimum one references should still be held.
*/
static void svc_rdma_detach(struct svc_xprt *xprt)
{
@ -963,15 +965,6 @@ static void svc_rdma_detach(struct svc_xprt *xprt)
/* Disconnect and flush posted WQE */
rdma_disconnect(rdma->sc_cm_id);
/* Destroy the QP if present (not a listener) */
if (rdma->sc_qp && !IS_ERR(rdma->sc_qp)) {
ib_destroy_qp(rdma->sc_qp);
svc_xprt_put(xprt);
}
/* Destroy the CM ID */
rdma_destroy_id(rdma->sc_cm_id);
}
static void __svc_rdma_free(struct work_struct *work)
@ -983,6 +976,13 @@ static void __svc_rdma_free(struct work_struct *work)
/* We should only be called from kref_put */
BUG_ON(atomic_read(&rdma->sc_xprt.xpt_ref.refcount) != 0);
/* Destroy the QP if present (not a listener) */
if (rdma->sc_qp && !IS_ERR(rdma->sc_qp))
ib_destroy_qp(rdma->sc_qp);
/* Destroy the CM ID */
rdma_destroy_id(rdma->sc_cm_id);
if (rdma->sc_sq_cq && !IS_ERR(rdma->sc_sq_cq))
ib_destroy_cq(rdma->sc_sq_cq);