fabtests: Test max inject size

Right now, we do not inject if the inject size is equal to the message
size.  We should inject in this case, as it is the most likely to cause
memory issues. Fix fabtests to test the largest allowable inject message
size.

Signed-off-by: Seth Zegelstein <szegel@amazon.com>

fabtests/benchmarks/benchmark_shared.c

@@ -104,7 +104,7 @@ int pingpong(void)
 			if (i == opts.warmup_iterations)
 				ft_start();
 
-			if (opts.transfer_size < inject_size)
+			if (opts.transfer_size <= inject_size)
 				ret = ft_inject(ep, remote_fi_addr, opts.transfer_size);
 			else
 				ret = ft_tx(ep, remote_fi_addr, opts.transfer_size, &tx_ctx);
@@ -124,7 +124,7 @@ int pingpong(void)
 			if (ret)
 				return ret;
 
-			if (opts.transfer_size < inject_size)
+			if (opts.transfer_size <= inject_size)
 				ret = ft_inject(ep, remote_fi_addr, opts.transfer_size);
 			else
 				ret = ft_tx(ep, remote_fi_addr, opts.transfer_size, &tx_ctx);
@@ -347,7 +347,7 @@ int bandwidth_rma(enum ft_rma_opcodes rma_op, struct fi_rma_iov *remote)
 		}
 		switch (rma_op) {
 		case FT_RMA_WRITE:
-			if (opts.transfer_size < inject_size) {
+			if (opts.transfer_size <= inject_size) {
 				ret = ft_post_rma_inject(FT_RMA_WRITE, tx_buf + offset,
 						opts.transfer_size, remote);
 			} else {
@@ -368,7 +368,7 @@ int bandwidth_rma(enum ft_rma_opcodes rma_op, struct fi_rma_iov *remote)
 					rx_seq++;
 
 			} else {
-				if (opts.transfer_size < inject_size) {
+				if (opts.transfer_size <= inject_size) {
 					ret = ft_post_rma_inject(FT_RMA_WRITEDATA,
 							tx_buf + offset,
 							opts.transfer_size,