[PATCH] IB: Add SRQ support to midlayer

Make the required core API additions and changes for
shared receive queues (SRQs).

Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 60 insertions, 0 deletions

diff --git a/drivers/infiniband/core/verbs.c b/drivers/infiniband/core/verbs.c
index c301a2c41f3..c035510c5a3 100644
--- a/drivers/infiniband/core/verbs.c
+++ b/drivers/infiniband/core/verbs.c
@@ -154,6 +154,66 @@ int ib_destroy_ah(struct ib_ah *ah)
 }
 EXPORT_SYMBOL(ib_destroy_ah);
 
+/* Shared receive queues */
+
+struct ib_srq *ib_create_srq(struct ib_pd *pd,
+                             struct ib_srq_init_attr *srq_init_attr)
+{
+        struct ib_srq *srq;
+
+        if (!pd->device->create_srq)
+                return ERR_PTR(-ENOSYS);
+
+        srq = pd->device->create_srq(pd, srq_init_attr, NULL);
+
+        if (!IS_ERR(srq)) {
+                srq->device        = pd->device;
+                srq->pd            = pd;
+                srq->uobject       = NULL;
+                srq->event_handler = srq_init_attr->event_handler;
+                srq->srq_context   = srq_init_attr->srq_context;
+                atomic_inc(&pd->usecnt);
+                atomic_set(&srq->usecnt, 0);
+        }
+
+        return srq;
+}
+EXPORT_SYMBOL(ib_create_srq);
+
+int ib_modify_srq(struct ib_srq *srq,
+                  struct ib_srq_attr *srq_attr,
+                  enum ib_srq_attr_mask srq_attr_mask)
+{
+        return srq->device->modify_srq(srq, srq_attr, srq_attr_mask);
+}
+EXPORT_SYMBOL(ib_modify_srq);
+
+int ib_query_srq(struct ib_srq *srq,
+                 struct ib_srq_attr *srq_attr)
+{
+        return srq->device->query_srq ?
+                srq->device->query_srq(srq, srq_attr) : -ENOSYS;
+}
+EXPORT_SYMBOL(ib_query_srq);
+
+int ib_destroy_srq(struct ib_srq *srq)
+{
+        struct ib_pd *pd;
+        int ret;
+
+        if (atomic_read(&srq->usecnt))
+                return -EBUSY;
+
+        pd = srq->pd;
+
+        ret = srq->device->destroy_srq(srq);
+        if (!ret)
+                atomic_dec(&pd->usecnt);
+
+        return ret;
+}
+EXPORT_SYMBOL(ib_destroy_srq);
+
 /* Queue pairs */
 
 struct ib_qp *ib_create_qp(struct ib_pd *pd,