From: Kaike Wan <kaike.wan@xxxxxxxxx>
The TID RDMA WRITE protocol differs from normal IB RDMA WRITE
in that TID RDMA WRITE requests do require responses, not just
ACKs.
Therefore, TID RDMA WRITE requests need to be treated as RDMA
READ requests from the point of view of the QPs' s_ack_queue.
In other words, the QPs' need to allow for TID RDMA WRITE
requests to be stored in their s_ack_queue.
However, because the user does not know anything about the TID
RDMA capability and/or protocols, these extra entries in the
queue cannot be advertized to the user.
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx>
Signed-off-by: Mitko Haralanov <mitko.haralanov@xxxxxxxxx>
Signed-off-by: Kaike Wan <kaike.wan@xxxxxxxxx>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
---
drivers/infiniband/hw/hfi1/tid_rdma.h | 11 +++++++++++
drivers/infiniband/hw/hfi1/verbs.c | 2 +-
2 files changed, 12 insertions(+), 1 deletions(-)
diff --git a/drivers/infiniband/hw/hfi1/tid_rdma.h b/drivers/infiniband/hw/hfi1/tid_rdma.h
index baba539..9b95235 100644
--- a/drivers/infiniband/hw/hfi1/tid_rdma.h
+++ b/drivers/infiniband/hw/hfi1/tid_rdma.h
@@ -28,6 +28,17 @@
*/
#define HFI1_S_TID_WAIT_INTERLCK BIT(5)
+/*
+ * Unlike regular IB RDMA VERBS, which do not require an entry
+ * in the s_ack_queue, TID RDMA WRITE requests do because they
+ * generate responses.
+ * Therefore, the s_ack_queue needs to be extended by a certain
+ * amount. The key point is that the queue needs to be extended
+ * without letting the "user" know so they user doesn't end up
+ * using these extra entries.
+ */
+#define HFI1_TID_RDMA_WRITE_CNT 8
+
struct tid_rdma_params {
struct rcu_head rcu_head;
u32 qp;
diff --git a/drivers/infiniband/hw/hfi1/verbs.c b/drivers/infiniband/hw/hfi1/verbs.c
index 88676ca..7b87b77 100644
--- a/drivers/infiniband/hw/hfi1/verbs.c
+++ b/drivers/infiniband/hw/hfi1/verbs.c
@@ -1888,7 +1888,7 @@ int hfi1_register_ib_device(struct hfi1_devdata *dd)
dd->verbs_dev.rdi.dparms.wss_threshold = wss_threshold;
dd->verbs_dev.rdi.dparms.wss_clean_period = wss_clean_period;
dd->verbs_dev.rdi.dparms.reserved_operations = 1;
- dd->verbs_dev.rdi.dparms.extra_rdma_atomic = 1;
+ dd->verbs_dev.rdi.dparms.extra_rdma_atomic = HFI1_TID_RDMA_WRITE_CNT;
/* post send table */
dd->verbs_dev.rdi.post_parms = hfi1_post_parms;
