RDMA/amso1100: Add support for "send with invalidate" work requests

Handle IB_WR_SEND_WITH_INV work requests.

This resurrects a patch sent long ago by Mikkel Hagen <mhagen@iol.unh.edu>.
Signed-off-by: Roland Dreier <rolandd@cisco.com>

drivers/infiniband/hw/amso1100/c2_qp.c

@@ -811,16 +811,24 @@ int c2_post_send(struct ib_qp *ibqp, struct ib_send_wr *ib_wr,
 
 		switch (ib_wr->opcode) {
 		case IB_WR_SEND:
-			if (ib_wr->send_flags & IB_SEND_SOLICITED) {
-				c2_wr_set_id(&wr, C2_WR_TYPE_SEND_SE);
-				msg_size = sizeof(struct c2wr_send_req);
+		case IB_WR_SEND_WITH_INV:
+			if (ib_wr->opcode == IB_WR_SEND) {
+				if (ib_wr->send_flags & IB_SEND_SOLICITED)
+					c2_wr_set_id(&wr, C2_WR_TYPE_SEND_SE);
+				else
+					c2_wr_set_id(&wr, C2_WR_TYPE_SEND);
+				wr.sqwr.send.remote_stag = 0;
 			} else {
-				c2_wr_set_id(&wr, C2_WR_TYPE_SEND);
-				msg_size = sizeof(struct c2wr_send_req);
+				if (ib_wr->send_flags & IB_SEND_SOLICITED)
+					c2_wr_set_id(&wr, C2_WR_TYPE_SEND_SE_INV);
+				else
+					c2_wr_set_id(&wr, C2_WR_TYPE_SEND_INV);
+				wr.sqwr.send.remote_stag =
+					cpu_to_be32(ib_wr->ex.invalidate_rkey);
 			}
 
-			wr.sqwr.send.remote_stag = 0;
-			msg_size += sizeof(struct c2_data_addr) * ib_wr->num_sge;
+			msg_size = sizeof(struct c2wr_send_req) +
+				sizeof(struct c2_data_addr) * ib_wr->num_sge;
 			if (ib_wr->num_sge > qp->send_sgl_depth) {
 				err = -EINVAL;
 				break;

drivers/infiniband/hw/amso1100/c2_rnic.c

@@ -455,7 +455,8 @@ int __devinit c2_rnic_init(struct c2_dev *c2dev)
 	     IB_DEVICE_CURR_QP_STATE_MOD |
 	     IB_DEVICE_SYS_IMAGE_GUID |
 	     IB_DEVICE_ZERO_STAG |
-	     IB_DEVICE_MEM_WINDOW);
+	     IB_DEVICE_MEM_WINDOW |
+	     IB_DEVICE_SEND_W_INV);
 
 	/* Allocate the qptr_array */
 	c2dev->qptr_array = vmalloc(C2_MAX_CQS * sizeof(void *));