RDMA/core: Inject Completion Queue errors
Reducing the size of a CQ provokes an overrun.
Suggested-by: Håkon Bugge <haakon.bugge@oracle.com>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
diff --git a/drivers/infiniband/core/core_priv.h b/drivers/infiniband/core/core_priv.h
index 7982430..64afd26 100644
--- a/drivers/infiniband/core/core_priv.h
+++ b/drivers/infiniband/core/core_priv.h
@@ -389,6 +389,7 @@
bool ignore_flush;
bool ignore_alloc_mr;
bool ignore_modify_qp;
+ bool ignore_cq_errors;
};
extern struct fail_rdma_verbs_attr fail_rdma_verbs;
diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index e7de41a..f2246f6 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -353,6 +353,8 @@
&fail_rdma_verbs.ignore_alloc_mr);
debugfs_create_bool("ignore-modify-qp", S_IFREG | 0600, dir,
&fail_rdma_verbs.ignore_modify_qp);
+ debugfs_create_bool("ignore-cq-errors", S_IFREG | 0600, dir,
+ &fail_rdma_verbs.ignore_cq_errors);
}
#else /* CONFIG_FAIL_RDMA_VERBS */
@@ -2964,6 +2966,13 @@
}
}
+static noinline void
+ib_maybe_fail_cq_error(struct ib_cq *cq)
+{
+ if (should_fail(&fail_rdma_verbs.attr, 1))
+ ib_resize_cq(cq, 2);
+}
+
static noinline int
ib_maybe_fail_post_send(struct ib_qp *qp, const struct ib_send_wr *send_wr,
const struct ib_send_wr **bad_wr)
@@ -3022,6 +3031,8 @@
const struct ib_send_wr *dummy;
const struct ib_send_wr **bad_wr = bad_send_wr ? : &dummy;
+ if (!fail_rdma_verbs.ignore_cq_errors)
+ ib_maybe_fail_cq_error(qp->send_cq);
if (!fail_rdma_verbs.ignore_post_send)
return ib_maybe_fail_post_send(qp, send_wr, bad_wr);
return qp->device->ops.post_send(qp, send_wr, bad_wr);
@@ -3081,6 +3092,8 @@
const struct ib_recv_wr *dummy;
const struct ib_recv_wr **bad_wr = bad_recv_wr ? : &dummy;
+ if (!fail_rdma_verbs.ignore_cq_errors)
+ ib_maybe_fail_cq_error(qp->recv_cq);
if (!fail_rdma_verbs.ignore_post_recv)
return ib_maybe_fail_post_recv(qp, recv_wr, bad_wr);
return qp->device->ops.post_recv(qp, recv_wr, bad_wr);
