[PATCH for-next 2/2] RDMA/efa: Expose 64-bit send WR ID support to userspace

[Yonatan Nachum <ynachum@amazon.com>]

Currently EFA WRs support 16-bit request ID, this requires EFA to manage
a translation table to translate the IB WR ID from 64-bits to 16-bits
and translating it back on CQ completion.
Expose a new device capability to handle 64-bit request ID for SQ WRs
allowing userspace to directly post the 64-bit ID to the device.

Reviewed-by: Michael Margolin <mrgolin@amazon.com>
Reviewed-by: Tom Sela <tomsela@amazon.com>
Signed-off-by: Yonatan Nachum <ynachum@amazon.com>
---
 drivers/infiniband/hw/efa/efa_verbs.c | 3 +++
 include/uapi/rdma/efa-abi.h           | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/infiniband/hw/efa/efa_verbs.c b/drivers/infiniband/hw/efa/efa_verbs.c
index 001bd8cb4f66..85e32a7c76c3 100644
--- a/drivers/infiniband/hw/efa/efa_verbs.c
+++ b/drivers/infiniband/hw/efa/efa_verbs.c
@@ -264,6 +264,9 @@ int efa_query_device(struct ib_device *ibdev,
 		if (EFA_DEV_CAP(dev, UNSOLICITED_WRITE_RECV))
 			resp.device_caps |= EFA_QUERY_DEVICE_CAPS_UNSOLICITED_WRITE_RECV;
 
+		if (EFA_DEV_CAP(dev, SQ_64_BIT_REQ_ID))
+			resp.device_caps |= EFA_QUERY_DEVICE_CAPS_SQ_64_BIT_REQ_ID;
+
 		if (dev->neqs)
 			resp.device_caps |= EFA_QUERY_DEVICE_CAPS_CQ_NOTIFICATIONS;
 
diff --git a/include/uapi/rdma/efa-abi.h b/include/uapi/rdma/efa-abi.h
index fc4b2eb903c9..1e371bfef6d8 100644
--- a/include/uapi/rdma/efa-abi.h
+++ b/include/uapi/rdma/efa-abi.h
@@ -135,6 +135,7 @@ enum {
 	EFA_QUERY_DEVICE_CAPS_RDMA_WRITE = 1 << 5,
 	EFA_QUERY_DEVICE_CAPS_UNSOLICITED_WRITE_RECV = 1 << 6,
 	EFA_QUERY_DEVICE_CAPS_CQ_WITH_EXT_MEM = 1 << 7,
+	EFA_QUERY_DEVICE_CAPS_SQ_64_BIT_REQ_ID = 1 << 9,
 };
 
 struct efa_ibv_ex_query_device_resp {
-- 
2.50.1