diff --git a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
index 2fa9247bb23db41e406c2243eee6d32fab06e372..58cc3d5327690015a8592eeddb1e5f3e1e1cce2f 100644
--- a/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
+++ b/drivers/net/ethernet/netronome/nfp/nfpcore/nfp_nsp.c
@@ -419,6 +419,14 @@ static int nfp_nsp_command_buf(struct nfp_nsp *nsp, u16 code, u32 option,
 		if (err < 0)
 			return err;
 	}
+	/* Zero out remaining part of the buffer */
+	if (out_buf && out_size && out_size > in_size) {
+		memset(out_buf, 0, out_size - in_size);
+		err = nfp_cpp_write(cpp, cpp_id, cpp_buf + in_size,
+				    out_buf, out_size - in_size);
+		if (err < 0)
+			return err;
+	}
 
 	ret = nfp_nsp_command(nsp, code, option, cpp_id, cpp_buf);
 	if (ret < 0)