RDMA/efa: Expose 64-bit send WR ID support to userspace

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>
Link: https://patch.msgid.link/20260722113331.2515247-3-ynachum@amazon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>

drivers/infiniband/hw/efa/efa_verbs.c

@@ -272,6 +272,9 @@ int efa_query_device(struct ib_device *ibdev,
 		if (EFA_DEV_CAP(dev, EVENT_COUNTERS))
 			resp.device_caps |= EFA_QUERY_DEVICE_CAPS_COMP_CNTR;
 
+		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;
 

include/uapi/rdma/efa-abi.h

@@ -136,6 +136,7 @@ enum {
 	EFA_QUERY_DEVICE_CAPS_UNSOLICITED_WRITE_RECV = 1 << 6,
 	EFA_QUERY_DEVICE_CAPS_CQ_WITH_EXT_MEM = 1 << 7,
 	EFA_QUERY_DEVICE_CAPS_COMP_CNTR = 1 << 8,
+	EFA_QUERY_DEVICE_CAPS_SQ_64_BIT_REQ_ID = 1 << 9,
 };
 
 struct efa_ibv_ex_query_device_resp {